| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 528.1 | Setting up Pad 40 for Mars Observer launch | ADVAX::KLAES | All the Universe, or nothing! | Thu Mar 14 1991 13:30 | 17 |
| From: henry@zoo.toronto.edu (Henry Spencer)
Newsgroups: sci.space,sci.space.shuttle
Subject: Space news from February 4 AW&ST
Date: 13 Mar 91 04:34:42 GMT
Organization: U of Toronto Zoology
Martin Marietta and Bechtel are scrambling to get pad 40 at the Cape
rebuilt in time for the Mars Observer launch in Sept 1992. MO will go
up on Commercial Titan, but the main objective of rebuilding pads 40
and 41 is better Titan 4 facilities, to support the USAF's plans for
up to six launches a year. Pad 40 rebuilding is particularly drastic,
with the old structure essentially being torn down and replaced in
its entirety.
--
"But this *is* the simplified version | Henry Spencer @ U of Toronto Zoology
for the general public." -S. Harris | henry@zoo.toronto.edu utzoo!henry
|
| 528.2 | Mars Observer apparently in trouble | MTWAIN::KLAES | All the Universe, or nothing! | Wed Aug 07 1991 20:21 | 72 |
| Article 34219
From: Wales.Larrison@ofa123.fidonet.org (Wales Larrison)
Newsgroups: sci.space
Subject: Why not save Mars Observer, as well?
Date: 7 Aug 91 04:47:15 GMT
Organization: Universal Electronics Inc. (Public access BBS)
Hey David!
>The Coalition to Save CRAF/Cassini has announced locations for
>upcoming rallies in support of the CRAF and Cassini spacecraft.
>This list is incomplete, and will be updated pending new rally
>sites being selected. All events will take place on September 7,
>1991 at 12 noon:
While all of this work for CRAF/Cassini is all very well and good,
WHAT ARE YOU DOING TO SAVE MARS OBSERVER?
Mars Observer is a funded, going program that is going to be (at
best) put on hold for 2 years, or out-right cancelled (at worst) in
this year's budget wars - unless we take action now.
The reason is Mars Observer needs to use a Titan pad equipped for a
Centaur upper stage. The next Mars launch window opens in the Sep/Oct
1992 time period. The only Titan pads are USAF pads, and while the
USAF was planning to modify a Titan-IV pad for accommodating the
Centaur upper stage in time for the Mars Observer launch, their
funding has been cut with the result of delaying the planned
modifications. The USAF is not planning to quickly modify a pad to
use Centaurs, since their space budget has been cut, and the
Titan-IV/Centaur development program is having problems, so they don't
have a requirement to make the pad modifications.
[Note: Mars Observer is planning to use a Titan-III/Centaur, but
the pad must be equipped with the special handling equipment for the
Centaur upper stage, hence the need to have a Titan pad equipped
with Centaur interfaces.]
The House voted to cut the $400 M which would have modified this
pad for the Titan and the Centaur. The Senate voted substantial,
but unspecified, cuts in the USAF space budget. If the funds
for modifying the pad are cut, then Mars Observer will have no
launch pad for its planned Sep/Oct 1992 launch window.
No pad, no launch.
Missing the launch window means a two year wait in the program -
that means the payload and upper stage would have to be placed in
storage for 2 years - at an estimated cost of $200 million. Some
staffers in DC are claiming that it would be cheaper to kill Mars
Observer than keep it going - particularly in a year with tight
budgets....
Regarding CRAF/Cassini - until Mars Observer's problems are
fixed, I'm sure little attention will be paid to CRAF/Cassini.
Given the added $100 M per year to put it in storage, I'm sure that
CRAF/Cassini would be placed on hold until Mars Observer is
launched. And why would anyone vote for a "new-start" planetary
science mission (like CRAF/Cassini), if they are cancelling an
existing planetary science program?
So David, what is "The Coalition to Save CRAF/Cassini" doing about
this? Or are you going to let an existing planetary science program
die?
- Wales -
--
Wales Larrison
Internet: Wales.Larrison@ofa123.fidonet.org
Compuserve: >internet:Wales.Larrison@ofa123.fidonet.org
|
| 528.3 | | PRAGMA::GRIFFIN | Dave Griffin | Wed Aug 07 1991 20:26 | 1 |
| What a charming, personal style Mr. Larrison has...
|
| 528.4 | | STAR::HUGHES | You knew the job was dangerous when you took it Fred. | Wed Aug 07 1991 21:00 | 7 |
| According to the Feb 91 Mixed Fleet Manifest, Mars Observer supposed to
fly on a Titan 3/TOS combination.
TOS is an upper stage deveoped by OSC that uses the same rocket motor
as the IUS.
gary
|
| 528.5 | Titan IV/TOS NOT Centaur | CARROL::LEPAGE | Truth travels slowly | Thu Aug 08 1991 14:28 | 6 |
| I have to agree with Gary; I seem to remember that the M.O. was
suppose to fly on a Titan IV/TOS. I'll have to check it out to make
sure.
Drew
|
| 528.6 | RE 528.2 | MTWAIN::KLAES | All the Universe, or nothing! | Fri Aug 09 1991 15:04 | 40 |
| Article 138
From: Wales.Larrison@nss.FIDONET.ORG (Wales Larrison)
Newsgroups: talk.politics.space
Subject: Re: Mars Observer, Error Correction
Date: 9 Aug 91 03:52:10 GMT
Organization: The NSS BBS, Pittsburgh PA (412) 366-5208
> The reason is Mars Observer needs to use a Titan pad equipped for
>a Centaur upper stage. The next Mars launch window opens in the
>Sep/Oct 1992 time period. The only Titan pads are USAF pads, and
>while the USAF was planning to modify a Titan-IV pad for
>accommodating the Centaur upper stage in time for the Mars Observer
>launch, their funding has been cut with the result of delaying the
>planned modifications. The USAF is not planning to quickly modify
>a pad to use Centaurs, since their space budget has been cut, and
>the Titan-IV/Centaur development program is having problems, so
>they don't have a requirement to make the pad modifications.
> [Note: Mars Observer is planning to use a Titan-III/Centaur, but
>the pad must be equipped with the special handling equipment for
>the Centaur upper stage, hence the need to have a Titan pad
>equipped with Centaur interfaces.]
To all.... This is in error. The Mars Observer mission uses a TOS
upper stage, not a Centaur upper stage. My source in D.C. obviously
was mistaken about the pad mod required. The Aug 5-18th Space News
also reports this issue on page 1, blaming it on an unspecified pad
modification needed that is currently not funded.
The pad mod issue is still a threat to Mars Observer. Let us hope
this gets resolved in the joint conference committee...
- Wales Larrison -
--- Opus-CBCS 1.71
* Origin: NSS BBS - Ad Astra! (412)366-5208 *HST* (1:129/104.0)
--
Wales Larrison - via FidoNet node 1:129/104
UUCP: ...!pitt!nss!Wales.Larrison
INTERNET: Wales.Larrison@nss.FIDONET.ORG
|
| 528.7 | | STAR::HUGHES | You knew the job was dangerous when you took it Fred. | Fri Aug 09 1991 19:19 | 11 |
| It IS true that Commercial Titan operations are in a stand down status
while waiting for LC-41 changes to complete. I think this primarily to
avoid getting into scheduling conflicts as one of the LC-41 pads is
still operating for Titan 4 launches.
Mars Observer is scheduled to fly on a Commercial Titan/Transfer Orbit
Stage configuration. I don't think there is any technical reason why
this couldn't fly on the current operational pad if the second one is
not online by Sep 92.
gary
|
| 528.8 | MARS OBSERVER Update | MTWAIN::KLAES | All the Universe, or nothing! | Thu Jan 16 1992 13:17 | 44 |
| Article: 39235
From: Wales.Larrison@ofa123.fidonet.org (Wales Larrison)
Newsgroups: sci.space
Subject: Mars Observer on Track to Launch
Date: 10 Jan 92 04:59:34 GMT
Organization: Universal Electronics Inc. (Public access BBS)
To all on the net,
Some months ago I posted some concerns regarding whether or not the
Mars Observer would make it to the launch pad on time, due to pad
modifications which needed to be made, but which had been hung up in
the Congressional funding process. As a follow-up, the current
status is that the Mars Observer is still following a tight schedule
to meet its planned launch data, but it looks like everything is
coming along O.K., and it should meet the launch data - assuming
nothing bizzare happens along the way.
The most recent data has the:
o MO spacecraft in alignment at GE, as schedule.
o Titan III booster launch facility mods are nearing completion
at CCAFS. The contractor team doing the pad mods are just
about on schedule, with no significant issues remaining.
o Orbital Sciences Corp TOS solid upper stage being shipped from
Denver to Florida this week, and should arrive 10 Jan.
o 5 of the 8 science instruments are now integrated, with the
remaining 3 in test or integration.
The schedule is very tight, but very little slack time, but there
are no remaining technical or programatic issues. The next expected
major milestone will be the start of the integrated spacecraft
thermal/vaccuum test in late February. The launch window is from 16
Sept to 6 Oct this year.
--------------------------------------------------------------------
Wales Larrison Space Technology Investor
--
Wales Larrison
Internet: Wales.Larrison@ofa123.fidonet.org
Compuserve: >internet:Wales.Larrison@ofa123.fidonet.org
|
| 528.9 | The camera on Mars Observer | VERGA::KLAES | All the Universe, or nothing! | Sun Feb 16 1992 16:00 | 194 |
| Article: 40343
From: henry@zoo.toronto.edu (Henry Spencer)
Newsgroups: sci.space
Subject: Re: Ulysses Update - 02/08/92 (Jupiter Flyby)
Date: 14 Feb 92 04:54:00 GMT
Organization: U of Toronto Zoology
Mike Caplinger (of the Mars Observer Camera project at JPL) is having
trouble with his local news software, so at his request I'm posting
his rebuttal to my recent flame about cameras on spacecraft. I'm not
sure I agree with everything he says, but it's worth hearing his side,
especially since he's included a lot of fascinating technical detail:
---------------
Henry Spencer's posts are usually so high-quality that I was really
dismayed when I saw this yesterday:
> The compulsion to hang a camera on everything, while it has its merits,
> also has its problems. Cameras are complicated, need a spacecraft that
> doesn't spin (Ulysses does, for better fields-and-particles coverage of
> the sky and for simplicity and robustness), generally need a complicated
> several-degrees-of-freedom platform to point them, and invariably need
> high-powered transmitters and a big antenna to get the desired data rate.
> (Galileo probably wouldn't have needed that unfurling antenna except for
> its cameras.) Cameraless spacecraft are simpler and cheaper. It was a
> bad day for Mars Observer when somebody decided that a spacecraft meant
> as a nearly-dedicated geoscience mission just *had* to have a camera;
> the results will be valuable but the cost was high.
There are three basic parts to this view. Let me take these in turn.
SPENCER'S VIEW, #1: cameras always lead to more expensive and complicated
spacecraft; they need need a spacecraft that doesn't spin, scan platforms,
big antennas, etc.
Specific counterexamples:
Giotto camera: Giotto was spin-stabilized, and its HMC was a high
resolution camera, with a 1000+ mm focal length. The nucleus of Halley was
one of the darkest solar system extended objects ever photographed (A <
0.05). The flyby velocity (~60 km/sec) made for short exposures and would
have been impossible with a conventional framing camera and shutter (i.e.,
the type of camera traditionally flown on three-axis stabilized platforms.)
Pioneer imaging photopolarimeters: Though fairly low-resolution, these
systems imaged in multiple colors from spin-stabilized spacecraft. The
flyby geometry of Pioneers 10 and 11 (Jupiter and Saturn) led to problems
close in, but the more distant images are comparable in quality to Voyager
far encounter images. Pioneer Venus got images of the Venusian clouds as
good as (most atmospheric scientists believe better) than those taken
during Galileo's Venus encounter. I think data rates on Pioneer were never
more than 2048 bits per second.
Mars Observer Camera: Specifically designed for a nadir-pointing spacecraft
with no scan platform. Using data compression and a large internal buffer,
the MOC can return data at any rate, and was designed to function at rates
as low as 150 bits per second.
While it may be true that many camera systems *have historically been*
expensive and demanding of spacecraft resources, this is not a necessary
requirement for cameras. For example, for the MOC, we proposed a camera
that fit the available, very constrained resources of Mars Observer--1/8th
the mass of the payload, 1/10 the power, 1/10th the lowest data rate, and
1/10th the dollars. We were the second smallest user of spacecraft
resources when finally selected.
SPENCER'S VIEW, #2: the addition of the Mars Observer Camera was very
costly for the Mars Observer mission and the entire Observer-class concept.
The cost increases of Mars Observer, while hard for me to break down
precisely because I don't have much insight into Project-level budgets,
appear to be mostly due to the two-year launch slip (due to the cost of
keeping people on board longer and pushing costs two years farther out on
the inflation index) and underestimates of the amount of effort it would
take to build the instruments, the spacecraft, and the mission operations
system. While the MOC has had cost increases comparable in percentage to
other instruments, it was one of the cheaper instruments initially, and
will still be in the middle of the pack at runout. Changing requirements
(MOC became integral to the the Mars Balloon Relay experiment, for example,
and this required additional redundancy and quality assurance because of
the mission rule that a single failure could not jeopardize two
experiments) have accounted for perhaps half of our overrun. MOC proposed at
about $5.5M, and left to our own devices, would probably be a $10-12M
instrument (it will actually come in at around $21M). For comparison, PMIRR
proposed a roughly $14M instrument and will probably come in just under
$35M, and TES proposed at $6.5M and will come in around $23M.
Another substantial fraction of the increase is also due to changing
perceptions. Mars Observer was originally a small, almost invisible
mission. But Mars has become much more important, both nationally and
internationally, since the mission was approved, our ability to start new
missions has deteriorated, and much more is riding on the mission than
originally intended. This has caused considerable "beefing up" in areas
such as quality assurance, parts reliability, and mission operations
preparations and staffing.
Whether small missions like the original vision of the Observer class, or
the present Discovery class, are really viable is also open to debate. Even
if many small missions are better than one big one (and there are technical
reasons to suggest they may not be), is it less costly to send six,
single-instrument $100M missions to a body than one, six-instrument $600M
mission? If you propose six small missions, and only get funded for one,
can you still get useful science results? (Maybe so -- if you fly only a
camera. :-)
SPENCER'S VIEW, #3: adding a camera to Mars Observer was an unnecessary frill.
The Solar System Exploration Committee established the following objectives
for the Mars Geoscience/Climatology Orbiter (which later became Mars Observer):
1) Determine global elemental and mineralogical character of the surface
MOC takes two color data, which will allow mapping of cation oxidation
state (an important chemical/mineralogical measurement to be made) at
resolutions of 300 m/pixel or better. It thus does better spatially than
VIMS and, combined with TES, will create composition maps far better than
VIMS would have.
2) Determine the time and space distribution, abundance, sources and sinks
of volatile materials and dust over a seasonal cycle;
MOC will directly measure the advance and retreat of the ice caps, and the
Narrow Angle will allow us to monitor the thickness of the seasonal ice
(the only instrument to do so; GRS cannot distinguish between CO2 shielding
by the atmosphere and that by surface ice). MOC is the only instrument
capable of capturing and tracking local, regional, and global dust storms.
3) Define globally the gravitational field and topography;
MOC will acquire local, regional and global stereo coverage from which
topographic maps of 50 m vertical resolution and 300 m horizontal
resolution will be compiled. MOLA gets 20 m vertical, 300 m downtrack and,
if lucky, 3000 m crosstrack by end of mission. The gravity field derived
from radio measurements will be in the range of several hundred microgal
over about 500 km, allowing a harmonic expansion of, at best, between 40
and 50 degree and order. This is based on tracking that determines the
position of the spacecraft to about 100 m RSS during four hours each day.
Optical navigation will acquire data to tell where the spacecraft is to
within 100 m RSS twenty-four hours a day, and using the NA, to a position
within 10 m at least once every three or four hours. This should give rise
to a gravity variance map of order and degree 60 for accelerations of a
hundred microgals.
4) Explore the structure and aspects of the circulation of the atmosphere;
MOC will observe directly the circulation of the atmosphere by
photographing clouds, dust plumes and storms, polar hoods, and wind
streaks. It will also observe aerosol and dust vertical structure on
the limb.
5) Establish the nature of the global magnetic field.
MOC RAM memory upset rate is sensitive to proton flux, which in turn is
dependent on solar wind proton abundance, which in turn is sensitive to the
solar wind "stand-off" mechanism and interaction with the Martian
environment. If there is a magnetic field, its strength and form should be
determinable by the variation of upsets as a function of orbital position
during solar flares.
So, MOC addresses every one of the SSEC objectives, in many cases better
than any other Mars Observer instrument, *and* it does so with
easily-interpretable imaging data. Note that this doesn't even get into
the question of the National Academy of Sciences Space Science Board's
recommendation that the highest priority science issues at Mars involve
detailed studies of local areas, the principal objective of the MOC high
resolution camera.
Although it may not be the instrument of choice to address any single
mission objective, in total the MOC addresses more of the objectives than
any other experiment. Its synergy with other components of the payload, in
particular providing a global context for each experiment while at the same
time allowing access to views of Mars at scales to which these other
experiments are sensitive, strongly reinforces the decision to include the
camera.
Finally, if the Space Exploration Initiative eventually takes off, I cannot
conceive of any experiment more important to future exploration of Mars
than the high resolution camera on Mars Observer. This fact has not been
lost on the SEI office, and they are taking a keen, if low-key, interest in
our operational capability.
While I don't want to downplay the usefulness and abilities of the other
instruments on Mars Observer to address important science questions, I
think in the end the record may likely show that MOC was the most
productive instrument on board.
Mike Caplinger, MSSS/Caltech Mars Observer Camera Project
mc@moc.jpl.nasa.gov
These are my opinions; I am not acting as an official spokesman for NASA,
JPL, Mars Observer or the MOC. Some of the material above was provided by
Mike Malin, the MOC Principal Investigator.
|
| 528.10 | Mars Observer Fact Sheet
| PRAGMA::GRIFFIN | Dave Griffin | Mon Feb 17 1992 23:09 | 179 |
| Mission Summary
The Mars Observer spacecraft will be the first U.S. mission launched
to Mars since the Viking missions in 1975. It will be launched from
NASA~s Kennedy Space Center between September 16 and October 13
aboard a Titan III rocket and a Transfer Orbit Stage (TOS). Mars
Observer will travel 720 million kilometers (450 million miles) in
11 months to its late-summer 1993 insertion into Martian orbit.
From its nearly circular polar orbit around the planet, the
three-axis stabilized spacecraft will conduct a comprehensive study
of the Martian geosphere over a period of 1 Martian year (687 Earth
days), mapping the surface and profiling the atmosphere with a
highly complementary set of instruments covering much of the
electromagnetic spectrum. Mars Observer will repeatedly map the
planet and its atmosphere in 26-day cycles. This global mapping
will help scientists understand the geological and climatological
history of Mars and the evolution of its interior and surface, and
will provide us with a basis for comparing Mars with Earth and
Venus. In late 1995, near the end of Mars Observers nominal
mission, it will begin to serve as a science data relay facility for
the landed stations deployed by the Soviet ~Mars 94 mission.
MARS
Equatorial Diameter 6,794 kilometers
Rotational Period: 24 hours, 37 minutes
Orbit Period: 687 Earth days
Distance from Sun: 227.9 million kilometers
Average Density: 3.94 gm/cm2
Surface Gravity: 372 cm/sec2
Atmospheric Pressure
at Surface: Variable, but about 8 millibars (1/125
Earth surface atmospheric pressure)
Temperature at Surface: Variable, 130-290 K
Atmospheric Composition: 95% carbon dioxide, 2~3% nitrogen, 0.1~0.4%
oxygen, 1~2% argon
Moons: Phobos (28 km maximum diameter)
Deimos (16 km maximum diameter)
Mission Objectives
To make observations that will enhance our understanding of the
geosciences and climatology of Mars, specifically:
* Determining the global elemental and mineralogical character of
the surface material
* Defining globally the topography and the gravitational field
* Establishing the nature of the magnetic field
* Determining the time and space distribution, abundance, sources,
and sinks of volatile material and dust over a seasonal cycle
* Exploring the structure and aspects of the circulation of the
atmosphere.
Major Mission Characteristics
Launch Date: September 16, 1992
Launch Vehicle: Titan III and a Transfer Orbit Stage (TOS)
Interplanetary Cruise: 11 months
Mars Arrival: August 1993
Mapping Orbit: 93~ inclination, nearly circular
Orbit Altitude: 389 kilometers (mean)
Mapping Orbit Period: 117-minute/orbit with a 7-day repeat cycle
Mapping Period: December 1993 through October 1995
Key Spacecraft Characteristics
Total Weight 1,018 kg (dry)
Size: (mapping Bus: 2.1 x 1.5 x 1.0 m
(l x w x h)
Configuration Solar Panel: 3.7 x 7 m
Boom: 6 m
Basic Design: Three-axis control system (highly
stabilized)
Boom Length 5.8 m (for GRS & MAG/ER)
Bipropellant system: Monomethyl hydrazine and nitrogen
tetroxide
Monopropellant system Hydrazine Thrusters
(24) (4) 490 N
(4) 22N
(8) 4.5 N (orbit trim)
(8) 0.9 N (momentum unloading & steering)
Total Propellant Weight: Bipropellant (1,353 kg) Hydrazine (84 kg)
Pointing Accuracy Control: 10 mrad
Knowledge: 3 mrad
Pointing Stability 1 mrad (for 0.5 s)
3 mrad (for 12 s)
Command Rate 12.5 commands/s (max)
Uplink Data Rate 500 bits/s (max)
Downlink Data Rate 85.3 kbits/s (max)
Downlink RF Power 44 watts
Tape Recorders (3) 1.38 x 109-bit capacity
Solar Array 6 panels, each 1.8 x 2.2 m
Array Output Power 1130 watts
Science Complement
Gamma Ray Spectrometer (GRS)
W. Boynton, University of Arizona
Uses a high-spectral-resolution boom-mounted detector to measure
gamma rays that emerge from the upper 90 centimeters of Mars~
surface. Spatial resolution of 320 kilometers.
Mars Observer Science Camera (MOC)
M. Malin
Produces a daily wide-angle (low-resolution) image of the entire
planet, and narrow-angle (high-resolution) images of objects as
small as 3 meters across.
Thermal Emission Spectrometer (TES)
P. Christensen, Arizona State University
Uses a Michelson interferometer to map thermal emission spectra in
the range of 6.25 to 50 ~m. Surface spatial resolution is
approximately 3.2 kilometers.
Pressure Modulator Infrared Radiometer (PMIRR)
D. McCleese,
Jet Propulsion Laboratory
Measures atmospheric profile from the limb of Mars, with a vertical
resolution of 4.8 kilometers. Can determine cloud type (H2O or
CO2).
Mars Observer Laser Altimeter (MOLA)
D. Smith,
NASA/GSFC
Samples topography profile 10 times per second with a vertical
precision of 2.1 meters. Laser footprint 160 meters in diameter.
Radio Science (RS)
G.L. Tyler, Stanford University
Uses occultation of Mars to measure changes in spacecraft radio
signal caused by planet~s gravity and atmosphere.
Magnetometer and Electron Reflectometer (MAG/ER)
M. Acuna,
NASA/GSFC
Boom-mounted magnetometers and reflectometer will establish the
nature of the planet is magnetic field, map the crustal residual
field, and characterize the solar wind/Mars plasma interaction.
Mars Balloon Relay (MBR)
J. Blamont, coordination
A radio system that will relay scientific telemetry from balloons or
landers deployed at Mars by the Soviet ~Mars ~94~ mission.
Mars Observer Team
NASA Headquarters
W.L. Piotrowski, Program Manager
B.M. French, Program Scientist
Jet Propulsion Laboratory
D.D. Evans, Project Manager
G.E. Cunningham, Deputy Project Manager
A.L. Albee, Project Scientist
F.D. Palluconi, Deputy Project Scientist
G.D. Pace, Spacecraft Manager
G.L. Reisdorf, Payload Manager
S.S. Dallas, Mission Manager
J. Shaffer, Jr., Launch Vehicle Manager
Spacecraft Contractor: GE Astro-Space
N. Gauss, Program Manager
|
| 528.11 | Update - March 24 | VERGA::KLAES | All the Universe, or nothing! | Thu Mar 26 1992 20:35 | 57 |
| Article: 590
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Activity Sheet
Date: 25 Mar 92 05:44:23 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Payload Test and Activity Sheet
Mars Observer
March 24, 1992
George H. Diller
Kennedy Space Center
407/867-2468
Spacecraft: Mars Observer
Upper Stage: Transfer Orbit Stage (TOS)
Vehicle: Titan III
Launch Complex: 40
Launch Date: September 16, 1992
Launch Window: 1:02-2:34 p.m. EDT
Launch Opportunity: 9/16-10/13
UPCOMING ACTIVITY:
3/26 Vehicle erection in Vertical Integration Building (VIB)
5/28 Vehicle systems test
6/13 Ship Mars Observer
6/16 Spacecraft arrival Hangar AO
6/24 Move Titan III to Solid Motor Assembly Building
7/1 Move Titan III to Launch Complex 40
7/6 Mars Observer move from AO to PHSF
8/3 Mate spacecraft to TOS upper stage (thru 8/4)
8/11 Begin payload encapsulation activites PHSF (thru 8/16)
8/17 Move payload to Complex 40 and erect
8/28 Countdown dress rehearsal
9/8 Launch vehicle/payload combined systems test (CST) 9/8
9/16 Begin terminal count 4:32 a.m.
ACTIVITY COMPLETE:
1/10 TOS arrives PHSF
2/28 Titan III vehicle arrives at VIB
3/14 Engines Arrive
3/15 Begin solid rocket booster build-up
3/16 Install 2nd Stage Engine
3/17 Install 1st Stage Engines
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | People will believe
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | anything if you whisper it.
|_____|/ |_|/ |_____|/ |
|
| 528.12 | NASA selects participating scientists for Mars Observer mission | PRAGMA::GRIFFIN | Dave Griffin | Thu Apr 02 1992 22:13 | 308 |
| Donald L. Savage
Headquarters, Washington, D.C. April 2, 1992
Release: 92-45
NASA has announced the selection of 33 participating
scientists to take part in a wide range of investigations on the
Mars Observer mission, planned for launch Sept. 16, 1992.
These scientists will be added to the current science teams in
October 1992 to increase the range of studies planned for the 2-
year global mapping mission. Team leaders and
interdisciplinary scientists were selected for Mars Observer in
1986.
"We are very glad to be able to provide this new scientific
talent to the Mars Observer mission," said Dr. Wesley T.
Huntress, Jr., Director of NASA's Solar System Exploration
Division. "Mars Observer is the most complex mission we have
ever flown to Mars, and it has a huge task to raise our
understanding of Mars to a new level by obtaining long-term
orbital data about the whole planet."
Mars Observer, America's first mission to Mars in more than
15 years, will be launched from the Kennedy Space Center, Fla.,
by a Titan-III expendable launch vehicle built by Martin
Marietta Corp. The spacecraft itself will ride on the new
Transfer Orbit Stage built by Orbital Sciences Corp., which will
send the spacecraft out of Earth orbit on its way to Mars.
In August 1993, after an 11-month interplanetary cruise,
the spacecraft will reach Mars where it will fire its on-board
engines and enter a nearly polar orbit at an altitude of 240
miles. The spacecraft's seven instruments will record the global
characteristics of Mars for slightly more than a full martian year
(687 Earth days) to watch a full cycle of changes in the martian
seasons. By early 1996, the spacecraft will have returned to
Earth more than 600 billion bits of scientific data, more than
has been collected by the nearly two dozen previous missions
flown to Mars by the U.S. and the former U.S.S.R.
Besides representing U.S. universities and research centers,
the newly-selected group of participating scientists include 4
individuals from the United Kingdom, France and Germany.
Six scientists from Austria, the United Kingdom, France and
Germany are already involved in the mission and a group of 10
participating scientists from Russia will be added later this
year.
Some of the 33 participating scientists will work with one of
the seven instrument-related science teams. The instruments
carried by Mars Observer are a gamma-ray detector to measure
the chemical composition of the surface; a laser altimeter to
measure the shape and topography of the surface; an infrared
detector to measure surface mineral composition; a different
infrared detector to measure the composition and behavior of
the martian atmosphere; a magnetometer to measure the
planet's magnetic field; and a camera to photograph the
landscape at resolutions ranging from a few kilometers to
several meters. In addition, careful tracking of the spacecraft's
radio signal will make it possible to map the gravity field of
Mars and some features of its atmospheric structure.
Other participating scientists will work with one of six
interdisciplinary science teams, which will combine data
collected by several different instruments to probe general
questions of Mars' geology, atmospheric behavior, surface
weathering, the influence of the polar caps and the migration of
water and carbon dioxide between the atmosphere, the polar
caps and the martian surface layer.
The wide range of Mars Observer science investigations will
focus on solving several mysteries which were revealed but not
settled by earlier U.S. missions to Mars, such as whether or not
Mars has a magnetic field, where the water has gone and
determining the mineral and chemical composition of martian
soil and bedrock. The information gathered on the planet's
gravitational field, atmospheric structure and surface
topography and properties will be crucial to future human
exploration of Mars.
"Mars Observer's mission is to make the first-ever global
scientific inventory of an entire planet," said Dr. Bevan M.
French, NASA's Program Scientist for the mission. "Mars is a
complex world. Parts of it are like the Moon, with ancient rocks
that preserve a record of intense meteorite bombardment during
the early years of the solar system. Other parts of Mars are
younger and more dynamic, like the Earth. These places have
volcanoes, great fractures in the crust and large channels cut
by running water a billion or two years ago."
"Mars also has polar ice caps, an atmosphere, clouds, frost,
wind and sand dunes," he continued. "We want to understand
how Mars formed and changed over time, why parts of it are
similar to Earth and why other parts are utterly different."
Mars Observer also will support data collection by the
Russian Mars-94 mission, which is planned to arrive at Mars in
late 1995 and land small stations on the planet's surface. A
communications relay on the Mars Observer spacecraft will
relay data from the surface stations to Earth. Depending on the
lifetime of the spacecraft, the same relay might be available later
to send back data collected from Mars-96, a subsequent
Russian mission that also will launch balloons into the martian
atmosphere.
Some of the Mars Observer's participating scientist
investigations will look beyond Mars and even beyond the solar
system. These include studies to detect and make high-
resolution measurements of the mysterious gamma-ray
"burster" events, studies of gamma-rays produced by violent
high-energy flares on the Sun, and the first deep-space search
for gravity waves using the extraordinarily precise tracking data
from the Mars Observer communication system. Gravity waves
are a fundamental phenomenon predicted by Einstein's Theory
of Relativity but have yet to be detected.
NASA's Jet Propulsion Laboratory, Pasadena, Calif.,
manages the Mars Observer project for the Office of Space
Science and Applications at NASA Headquarters, Washington,
D.C.
- end -
MARS OBSERVER PARTICIPATING SCIENTISTS
(Listed by Team Membership)
(NOTE: Only Participating Scientists were selected at this time.
Team Leaders and Interdisciplinary Scientists were selected for
Mars Observer in 1986.)
1. INSTRUMENT-RELATED TEAMS
TEAM: Gamma-Ray Spectrometer (GRS)
BRUCKNER, Johannes (Max Planck Institute, GERMANY)
"Experimental and theoretical simulations of the gamma-ray
emission of Mars: implications for the chemical analysis of its
surface"
DRAKE, Darrell M. (Los Alamos National Laboratory)
"Study of martian volatiles via coupled neutron-gamma-ray
fluxes"
EVANS, Larry G. (Computer Science Corporation)
"Elemental composition and background determination for the
Mars
Observer Gamma-Ray Spectrometer"
LAROS, John G. (Los Alamos National Laboratory)
"Gamma-ray burst studies using GRS"
STARR, Richard D. (Catholic University)
"Analysis of X-ray and gamma-ray emissions from solar flares
detected by the gamma-ray spectrometer"
TEAM: Magnetometer/Electron Reflectometer (MAG/ER)
MENVIELLE, M. (University of Paris, FRANCE)
"Study of the magnetic field of Mars with surface and satellite
data"
MOHLMANN, Diedrich (German Aerospace Research
Establishment (DLR), GERMANY) "Simultaneous and correlated
magnetic measurements (SCMM)"
SLAVIN, James A. (NASA Goddard Space Flight Center)
"An investigation of the Mars solar wind interaction and
intrinsic magnetic field"
TEAM: Mars Observer (Science) Camera (MOC)
DAVIES, Merton E. (RAND Corporation)
"The planetwide geodetic control network of Mars"
HARTMANN, William K. (Planetary Science Institute)
"Nature and duration of martian climate changes, studied
through martian craters and other geomorphic indicators"
JAMES, Philip B. (University of Toledo)
"Behavior of clouds and polar condensates on Mars"
McEWEN, Alfred S. (U.S. Geological Survey)
"Martian color and albedo variations"
THOMAS, Peter C. (RAND Corporation)
"Eolian sediments, seasonal changes, and topography of Mars
studied with the Mars Observer Camera"
TEAM: Mars Observer Laser Altimeter (MOLA)
BANERDT, W. Bruce (Jet Propulsion Laboratory)
"MOLA Participating Scientist: geophysical modelling of Mars"
DUXBURY, Thomas C. (Jet Propulsion Laboratory)
"MOC Geosciences: geodesy, cartography, and topography"
TEAM: Pressure Modulator Infrared Radiometer (PMIRR)
ALLISON, Michael D. (Goddard Institute for Space Sciences)
"Martian general circulation statistics via the objective analysis
of PMIRR data"
BARNES, Jeffrey R. (Oregon State University)
"Extratropical eddies in the atmospheric circulation and climate
system of Mars"
MARTIN, Terry Z. (Jet Propulsion Laboratory)
"Atmospheric studies with the Mars Horizon Sensor Assembly"
READ, Peter L. (University of Oxford, ENGLAND)
aroclinic wave dynamics and orographic influences in the
martian atmosphere: model/data comparisons using PMIRR"
TEAM: Thermal Emission Spectrometer (TES)
CLANCY, R. Todd (University of Colorado)
"Visible dust and cloud opacities from Mars Observer"
CONRATH, Barney J. (NASA Goddard Space Flight Center)
"Investigation of the structure and dynamics of the martian
atmosphere using thermal emission spectra"
ROUSCH, Ted L. (San Francisco State University)
"Collection, reduction, and interpretation of thermal emission
spectrometer data and their relationship to volatile-bearing
minerals on Mars"
TEAM: Radio Science (RS)
ARMSTRONG, John W. (Jet Propulsion Laboratory)
"A search for low-frequency gravitational radiation using the
Mars Observer telecommunications system"
FLASAR, F. Michael (NASA Goddard Space Flight Center)
"Meteorological studies of Mars from Radio Science
observations"
SIMPSON, Richard A. (Stanford University)
"Bistatic radar studies of Mars surface"
2. INTERDISCIPLINARY SCIENCE TEAMS:
TEAM: Interdiscipolinary Scientist
(Atmospheres/Climartology)
HABERLE, Robert M. (NASA Ames Research Center)
"The role of atmospheric transport in the current seasonal water
cycle on Mars"
TEAM: Interdisciplinary Scientist (Data Management/Surface
Weathering)
FEGLEY, Bruce (Washington University, St. Louis)
Constraints on martian chemical weathering from Mars
Observer Data"
TEAM: Interdisciplinary Scientist (Geosciences)
GOLUMBEK, Matthew (Jet Propulsion Laboratory)
"Structural geology of Mars"
McSWEEN, Harry Y. (University of Tennessee)
"Petrologic map of bedrock for Mars Observer"
TEAM: Interdisciplinary Scientist (Polar Atmospheric
Sciences)
HOUBEN, Howard (Space Physics Research Institute)
"Meteorological analyses and short-term forecasting with Mars
Observer data"
TEAM: Interdisciplinary Scientist (Surface-Atmosphere
Interactions)
ZENT, Aaron P. (SETI Institute)
"Mars Observer surface-atmosphere interaction IDS Support"
TEAM: Interdisciplinary Scientist (Surface Properties and
Morphology)
HERKENHOFF, Ken (Jet Propulsion Laboratory)
"Topography and composition of the polar layered deposits on
Mars"
MURRAY, Bruce C. (California Institute of Technology)
Mars Observer participating scientist program"
|
| 528.13 | Update - April 9 | VERGA::KLAES | All the Universe, or nothing! | Fri Apr 10 1992 19:52 | 67 |
| Article: 723
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Activity Sheet
Date: 10 Apr 92 05:10:53 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Payload Test and Activity Sheet
Mars Observer
April 9, 1992
George H. Diller
Kennedy Space Center
407/867-2468
Spacecraft: Mars Observer
Upper Stage: Transfer Orbit Stage (TOS)
Vehicle: Titan III
Launch Complex: 40
Launch Date: September 16, 1992
Launch Window: 1:02-2:34 p.m. EDT
Azimuth: 108 degrees
Launch Opportunity: 9/16-10/13
UPCOMING ACTIVITY:
5/28 Vehicle systems test
6/13 Ship Mars Observer
6/17 Spacecraft arrival Hangar AO *
6/24 Move Titan to Solid Motor Assembly Building
6/25 Mate solid rocket boosters (thru 6/30)
7/1 Move Titan III to Launch Complex 40
7/7 Mars Observer move from AO to PHSF *
8/2 Mate spacecraft to TOS upper stage
8/4 TOS/Mars Observer IVT
8/10 TOS fueling
8/13 Begin payload encapsulation activites PHSF (thru 8/16)
8/17 Move payload to Complex 40 and erect *
8/26 Operational Readiness Test and Network Simulation *
8/29 Countdown Dress Rehearsal T-0 *
9/8 Launch vehicle/payload Combined Systems Test (CST) *
9/9 Launch vehicle ordnance installation *
9/11 Load vehicle oxidizer *
9/12 Load vehicle fuel *
9/14 Range Safety command checks *
9/15 Launch vehicle pressurization *
9/16 Begin terminal count 4:32 a.m.
ACTIVITY COMPLETE:
1/10 TOS arrives PHSF
2/28 Titan III vehicle arrives at VIB
3/14 Engines Arrive
3/15 Begin solid rocket booster build-up
3/16 Install 2nd Stage Engine
3/17 Install 1st Stage Engines
3/26 Vehicle erection in Vehicle Integration Building (VIB)
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | People will believe
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | anything if you whisper it.
|_____|/ |_|/ |_____|/ |
|
| 528.14 | Update - June 23 | VERGA::KLAES | Slaves to the Metal Hordes | Wed Jun 24 1992 21:24 | 74 |
| Article: 1256
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Activity Sheet - 06/23/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Wed, 24 Jun 1992 05:14:43 GMT
Payload Test and Activity Sheet
Mars Observer
June 23, 1992
George H. Diller
Kennedy Space Center
407/867-2468
Spacecraft: Mars Observer
Upper Stage: Transfer Orbit Stage (TOS)
Vehicle: Titan III
Launch Complex: 40
Launch Date: September 16, 1992
Launch Window: 1:02-2:34 p.m. EDT
Azimuth: 108 degrees
Launch Opportunity: 9/16-10/13
* denotes change since last status
UPCOMING ACTIVITY:
6/22 Begin spacecraft subsystem testing (thru 6/30) *
6/26 Deep Space Network compatability test *
6/27 Propulsion system leak checks (thru 6/28) *
6/24 Move Titan to Solid Motor Assembly Building
6/25 Mate solid rocket boosters (thru 6/30)
7/1 Move Titan III to Launch Complex 40
7/7 Mars Observer move from AO to PHSF
7/16 Fueling and pressurizaion activities (thru 7/27) *
7/28 Spacecraft weight and balance *
8/2 Mate spacecraft to TOS upper stage
8/3 TOS/Mars Observer IVT *
8/5 TOS closeouts and fueling activities (thru 8/9) *
8/13 Begin payload encapsulation activites PHSF (thru 8/16) *
8/17 Move payload to Complex 40 and erect
8/26 Operational Readiness Test and Network Simulation
8/29 Countdown Dress Rehearsal T-0
9/8 Launch vehicle/payload Combined Systems Test (CST)
9/9 Launch vehicle ordnance installation
9/11 Load vehicle oxidizer
9/12 Load vehicle fuel
9/14 Range Safety command checks
9/15 Launch vehicle pressurization
9/16 Begin terminal count 4:32 a.m.
ACTIVITY COMPLETE:
1/10 TOS arrives PHSF
2/28 Titan III vehicle arrives at VIB
3/14 Engines Arrive
3/15 Begin solid rocket booster build-up
3/16 Install 2nd Stage Engine
3/17 Install 1st Stage Engines
3/26 Vehicle erection in Vehicle Integration Building (VIB)
6/15 Ship Mars Observer
6/19 Spacecraft arrival Hangar AO
6/22 Titan core vehicle Combined Systems Test (CST)
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Pound for pound,
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | grasshoppers are 3 times as
|_____|/ |_|/ |_____|/ | nutritious as beef.
|
| 528.15 | Update - July 6 | VERGA::KLAES | Slaves to the Metal Hordes | Tue Jul 07 1992 17:43 | 82 |
| From: DECWRL::"usenet-space-news-request@ames.arc.nasa.gov" 7-JUL-1992
13:37:16.83
To: usenet-space-news@ames.arc.nasa.gov
CC:
Subj: Mars Observer Update - 07/06/92
[The Mars Observer spacecraft arrived at Kennedy Space Center on June 19
and is undergoing preparation for launch on September 16, 1992. The
spacecraft will be launched on a Titan III with a Transfer Orbit Stage
(TOS) and will take about 11 months to reach Mars (August 1993). Mars
Observer will initially be in a highly elliptical capture orbit, and will
execute a series of seven maneuvers over a period of four months to place
itself into a mapping orbit with a period of 2 hours. Once the mapping
orbit is established, the collection of science data will begin and
continue for 687 Earth days (one Martian year). The main objective of
the mission is to study the surface, atmosphere and climate of Mars, and
to produce high resolution surface maps of the planet for planning future
lander missions. The spacecraft is also carrying equipment to relay data
from the balloons from the Soviet's Mars '94 (or '96?) mission.
Ron Baalke]
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 72 Days
Date of report: 7-6-92 Time of report: 9:00 pm EDT
Mission operations system compatibility test sequence T1 was completed
successfully this morning. A TES (Thermal Emission Spectrometer)
trouble shooting sequence was generated and executed without a
reoccurrence of the mirror positioning anomaly observed in SEPET's C
and D. Work continued on modification of the TOS (Transfer Orbit
Stage) adapter harness to install the three properly keyed connectors.
A discussion of the results of the unsuccessful DSN (Deep Space
Network) compatibility test of commanding capabilities revealed two
problems: one associated with the DSN's standards and limits table,
and another with a procedural problem in command file generation.
This command test will be repeated (preliminary scheduled for
Wednesday, 7/8), with a modification to the command subcarrier
frequency to accommodate an idiosyncracy in the spacecraft design.
The GRS (Gamma Ray Spectrometer) processor shut down incident has been
identified as an internal GRS software problem that can be corrected
in the uploaded files. The stopping of MAG (Magnetometer) data
appears to be the repeat of a previously seen, and unrepeatable at
will, situation that occurs at some PDS (Payload Data Subsystem) mode
changes.
PMIRR's (Pressure Modulator Infrared Radiometer) scan mirror was
driven into its stops as the probable result of an improperly modified
turn-on sequence during TES trouble shooting.
Considerable attention was devoted to trying to understand the TES
mirror position anomaly. At the end of the day, it was decided to
install a breakout box in order to monitor the voltage and current at
the instrument's interface during the M13 sequence as a diagnostic aid.
A repeat of the Celestial Sensor Assembly (CSA) phasing test is
scheduled to begin as soon as the phase II lightning restriction is
lifted tonight. This will be followed by a repeat of the mission
operations system compatibility test sequence M13 (which was
previously terminated by a lightning shutdown).
The ACTS TOS has been removed from the PHSF (Payload Hazardous Support
Facility) to make room for MO's (Mars Observer) arrival on Thursday.
The MO-TOS interface test with the new adapter harness will be
conducted on Tuesday.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | In 1991 there were 16 names
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | listed on the FBI's ten
|_____|/ |_|/ |_____|/ | most wanted list.
|
| 528.16 | Updates - July 7-9 | VERGA::KLAES | Slaves to the Metal Hordes | Fri Jul 10 1992 19:39 | 400 |
| Article: 1328
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Images Available
Date: 30 Jun 92 08:08:39 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
==========================
MARS IMAGES
June 29, 1992
==========================
Twelve new color Mars images are now available in the GIF and
JPEG format. The images were created from Viking Orbiter data and have
some strings attached to them. Please note the following:
o These images are a sample of the color mosaics which
will be published in the near future as a CD-ROM available
through the Planetary Data System and the National Space
Science Data Center;
o The creation of these special color mosaics was done by
the United States Geological Survey (USGS), Branch of
Astrogeology, Flagstaff, Arizona by careful rectification
of the original imagery from the Viking Orbiter spacecraft;
o The colors do not represent a true rendition of the colors
of Mars; they are enhanced to improve the visibility of
subtle details on the surface;
o These samples are only preliminary and anyone wishing to
use such images in either paper or digital publications
should wait for the availability of the final versions
with the release of the CD-ROM. The images on the CD-ROM,
once it is released, will be in the public domain.
The images are available using anonymous ftp. The numbers following the
"MG" prefix indicate the latitude and longitude of the center of each image.
ftp: ames.arc.nasa.gov (128.102.18.3)
user: anonymous
cd: pub/SPACE/GIF
files:
mg00n037.gif
mg00n052.gif
mg00n067.gif
mg00n082.gif
mg15n037.gif
mg15n052.gif
mg15n067.gif
mg15n082.gif
mg15s037.gif
mg15s052.gif
mg15s067.gif
mg15s082.gif
cd: pub/SPACE/JPEG
files:
mg00n037.jpg
mg00n052.jpg
mg00n067.jpg
mg00n082.jpg
mg15n037.jpg
mg15n052.jpg
mg15n067.jpg
mg15n082.jpg
mg15s037.jpg
mg15s052.jpg
mg15s067.jpg
mg15s082.jpg
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Pound for pound,
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | grasshoppers are 3 times as
|_____|/ |_|/ |_____|/ | nutritious as beef.
Article: 1391
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Activity Sheet
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Wed, 8 Jul 1992 01:39:41 GMT
Payload Test and Activity Sheet
Mars Observer
July 7, 1992
George H. Diller
Kennedy Space Center
407/867-2468
Spacecraft: Mars Observer
Upper Stage: Transfer Orbit Stage (TOS)
Vehicle: Titan III
Launch Complex: 40
Launch Date: September 16, 1992
Launch Window: 1:02-2:34 p.m. EDT
Azimuth: 93 - 108 degrees
Launch Opportunity: 9/16-10/13
* denotes change since last status
UPCOMING ACTIVITY:
7/08 Complete spacecraft subsystem testing *
7/09 Mars Observer move from AO to PHSF *
7/16 Fueling and pressurization activities (thru 7/27)
7/28 Spacecraft weight and balance *
7/29 Mate spacecraft to Titan III adapter *
8/02 Mate spacecraft to TOS upper stage
8/03 TOS/Mars Observer IVT
8/05 TOS closeouts and fueling activities (thru 8/9)
8/13 Begin payload encapsulation activites PHSF (thru 8/16)
8/17 Move payload to Complex 40 and erect
8/26 Operational Readiness Test and Network Simulation
8/29 Countdown Dress Rehearsal T-0
9/08 Launch vehicle/payload Combined Systems Test (CST)
9/09 Launch vehicle ordnance installation
9/11 Load vehicle oxidizer
9/12 Load vehicle fuel
9/14 Range Safety command checks
9/15 Launch vehicle pressurization
9/16 Begin terminal count 4:32 a.m.
ACTIVITY COMPLETE:
1/10 TOS arrives PHSF
2/28 Titan III vehicle arrives at VIB
3/14 Engines Arrive
3/15 Begin solid rocket booster build-up
3/16 Install Titan 2nd Stage Engine
3/17 Install Titan 1st Stage Engines
3/26 Vehicle erection in Vehicle Integration Building (VIB)
6/15 Ship Mars Observer
6/19 Spacecraft arrival Hangar AO
6/22 Titan core vehicle Combined Systems Test (CST)
6/24 Move Titan to Solid Motor Assembly Building
6/28 Mars Observer propulsion system leak checks
6/30 Solid rocket booster mating to core vehicle complete
7/02 Move Titan III to Launch Complex 40
7/03 Mars Observer Deep Space Network compatability test
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | In 1991 there were 16 names
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | listed on the FBI's ten
|_____|/ |_|/ |_____|/ | most wanted list.
Article: 1403
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 07/07/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Wed, 8 Jul 1992 23:59:33 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 71 Days
Date of report: 7-7-92 Time of report: 6:00 pm EDT
Mission operations system compatibility test sequence M13 was begun
near midnight last night and continued until a phase II lightning
condition required the spacecraft to be powered off at about 5 PM.
The test appeared to be successful. A breakout box was installed
in the TES (Thermal Emission Spectrometer) power interface to monitor
voltage and current should a reoccurrence of the TES mirror position
anomaly be seen. The anomaly has not repeated. A significant RF
(Radio Frequency) interference event occurred at the time of a
Delta/GPS launch and again shortly thereafter in the early morning
hours. The RFI affected the spacecraft checkout station. An
investigation of the cause and a more detailed assessment of the
spacecraft performance at the time is underway.
The TES anomaly has not been solved. The principal investigator will
be on-site tomorrow for additional discussions of potential trouble
shooting activities.
Scheduling of the remaining activities in Building AO continues in
fine detail to support shipment of the spacecraft to the PHSF
(Payload Hazardous Support Facility) during the day shift on
Thursday, 7/9.
In the continuing saga of the TOS (Transfer Orbit Stage) adapter
harness rework, a defective connector was found after installation on
the new cable. This additional rework has again deferred the repeat
of the interface test with TOS to Wednesday, 7/8.
The repeat of the DSN (Deep Space Network) commanding compatibility
test is scheduled to begin at midnight tonight.
The official activation of Launch Complex 40 was celebrated today
with a short ceremony at the base of the Mobile Service Tower with
the Titan vehicle in place behind the speakers' platform.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | In 1991 there were 16 names
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | listed on the FBI's ten
|_____|/ |_|/ |_____|/ | most wanted list.
Article: 1413
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Update - 07/08/92
Date: 9 Jul 92 23:49:07 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 70 Days
Date of report: 07-08-92 Time of report: 6:00 pm EDT
The mission operation system compatibility test sequence M13 was
once again terminated early by a phase II lightning condition last
night.
After the lightning storm passed, the PMIRR (Pressure Modulator
Infrared Radiometer) mirror was stowed correcting a condition created
by an improper turn-on sequence on 7/6. A test to check the high
gain antenna gimbal drive actuator telemetry indicated that during
the abnormal spacecraft shut down of the previous M13 sequence the
actuators changed position. This condition is under investigation
and remains a lien against the spacecraft configuration at this time.
The retest of the DSN (Deep Space Network) compatibility test command
sequences began after midnight this morning with the subcarrier
frequency offset by 2 Hz, and 10 seconds between commands. Results
were not satisfactory in the 7.2 bps mode. Investigation continues to
pin point the cause of missed commands and establish that performance
is satisfactory with the modified procedure identified above.
The countdown/recycle procedure will be tested this evening,
followed by two diagnostic tests related to the TES (Thermal Emission
Spectrometer) mirror position anomaly (which has not reoccurred since
SEPET D).
Spacecraft power will be shut off in Building AO for the last time
about 2 AM on Thursday morning, and the mechanical operations
started to move the spacecraft onto the PETS (Payload Environmental
Transport System) for transport to the PHSF (Payload Hazardous Support
Facility) mid-morning on Thursday.
Rework and checkout of the TOS (Transfer Orbit Stage) adapter harness
has extended through most of the day today. The repeat of the
interface test with TOS is about to occur.
An activity has been started to prepare to recalibrate the
spacecraft mass properties measuring equipment here because the
previous calibrations, and the spacecraft mass properties data are
now in question.
A photo opportunity event was held today in the hi-bay for the
benefit of the local Florida press corps.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | In 1991 there were 16 names
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | listed on the FBI's ten
|_____|/ |_|/ |_____|/ | most wanted list.
Article: 1420
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Update - 07/09/92
Date: 10 Jul 92 04:28:15 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
George H. Diller July 9, 1992
Kennedy Space Center
407/867-2468
Bob MacMillin
Jet Propulsion Laboratory
818/354-5011
KSC Release No. 89-92
MARS OBSERVER REACHES MAJOR MILESTONE IN PRELAUNCH PREPARATIONS
The Mars Observer spacecraft passed another major
milestone toward launch in September when it was transported from
Hangar AO on Cape Canaveral Air Force Station to the Payload
Hazardous Servicing Facility (PHSF) on the Kennedy Space Center.
Mars Observer has been at Hangar AO undergoing testing of
its instruments, communications and spacecraft systems since it
arrived at the Cape on June 19.
At the PHSF, the next major activity will be to fuel the
spacecraft with its orbit insertion and attitude control
propellants. This will be followed by mating to the Transfer
Orbit Stage (TOS) which is currently scheduled to occur on August
2. This is the upper stage that will provide the final thrust to
propel the spacecraft on its 11-month journey to Mars.
After the TOS has also been fueled with its control
propellant, there will be integrated testing of the two flight
elements, followed by encapsulation in the nose fairing. The
Mars Observer/TOS combination is scheduled to be moved to Launch
Complex 40 for mating to the Titan III rocket on August 17.
Mars Observer will be the first U.S. mission launched to
Mars since the Viking program in 1975. From a circular Martian
polar orbit of 250 miles it will conduct a comprehensive study
for one Martian year, or 687 Earth days, mapping the surface and
profiling the atmosphere.
The liftoff of Mars Observer is scheduled for September 16
at the opening of a launch window which extends from 1:02 - 2:34
p.m. EDT.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | In 1991 there were 16 names
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | listed on the FBI's ten
|_____|/ |_|/ |_____|/ | most wanted list.
Article: 1422
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update #2 - 07/09/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Fri, 10 Jul 1992 10:27:51 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 69 Days
Date of report: 7-9-92 Time of report: 7:00 pm EDT
The spacecraft was transported to the PHSF (Payload Hazardous Support
Facility) today. Power was turned off at 1:30 AM this morning, the
spacecraft was installed on the Payload Environmental Transportation
System (PETS) fixture at 10:00 AM, and the PETS was in the airlock at
the PHSF at 3:30 PM. The second shift will install the spacecraft on
the test dolly, and begin connecting the remote interfacing equipment
(RLE) which will allow the spacecraft to be controlled from the
checkout station which remains in Building AO. Tomorrow, the spacecraft
will be cabled up to the RLE and the post-transport GO/NO-GO SEPET will be
conducted.
Yesterday evening the countdown/recycle test was conducted. It had
a few procedural errors and will have to be rerun in the PHSF.
Also, two diagnostic tests were conducted by the TES (Thermal Emission
Spectrometer) team to troubleshoot their mirror position anomaly. Once
again, the anomaly did not repeat, and the positions of the optical
sensors checked during the test were perfect. The TES team has
recommended proceeding to launch without additional testing. Data
review at the times of the occurrence of the position anomalies
continues.
The rerun of the TOS (Transfer Orbit Stage) interface test with the
new adapter harness was not completed today because a test cable, which
was faulty at the first test, had not been repaired. The cable will be
repaired on Friday, and the interface test run on Saturday.
A problem exists at Launch Complex 40 involving a mechanical
interference between the Umbilical Mast and the new Mobile Service
Tower. Studies of a method to provide a temporary fix for Mars
Observer are underway. A good deal of the Titan's contingency time
has been lost to this problem.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | In 1991 there were 16 names
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | listed on the FBI's ten
|_____|/ |_|/ |_____|/ | most wanted list.
|
| 528.17 | Updates - July 10-16 | VERGA::KLAES | Slaves to the Metal Hordes | Fri Jul 17 1992 18:36 | 358 |
| Article: 1429
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 07/10/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Sat, 11 Jul 1992 07:05:37 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 68 Days
Date of report: 7-10-92 Time of report: 6:00 pm EDT
The spacecraft spent last night in the PHSF (Payload Hazardous
Support Facility) airlock on the PETS (Payload Environmental
Transport System) purge system. The spacecraft was moved into the
PHSF hi-bay at mid-day, and the PETS left at mid-afternoon. The
propulsion crew prepared the He pressurization system and began
pressurizing the He tank to flight pressure.
The Remote Launch Equipment (RLE) was damaged during its
installation in the PHSF. A cable applied the wrong phase power
when connected to the PHSF power source. The cause of the problem
has not be clearly identified as of this writing. As a
consequence, the RLE fuses opened, and a 5 volt power supply
failed. Additional consequences will not be known until the power
supply is replaced tomorrow. This problem has set back spacecraft
power up by at least a day.
The rework of the test cable for the TOS (Transfer Orbit Stage)
interface test will be completed tonight, and the interface test will
be repeated tomorrow with the new adapter harness.
Other activity tomorrow will include the fixing and checkout of the
RLE and a dry run of the TOS interface test #2 (with the spacecraft
standalone). The calibration of the spacecraft weighing fixture
will begin.
The support staff (GE, JPL and payload) has been significantly
reduced today. Spacecraft operations, both electrical and
mechanical (including propulsion loading) are now scheduled for
only two shifts per day. Third shift electrical testing will only
be done for extraordinary items which are launch critical. The
science payload instruments will not be turned on again until after
launch (unless it is necessary to perform a lightning damage search).
As a result of the interference problem between the Umbilical Mast
and the Mobile Service Tower, Titan now believes that they have 1
1/2 weeks of slack time before the encapsulated spacecraft and TOS
arrive at the launch complex on 8/17.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | In 1991 there were 16 names
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | listed on the FBI's ten
|_____|/ |_|/ |_____|/ | most wanted list.
Article: 1434
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Update - 07/12/92
Date: 13 Jul 92 09:31:03 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 66 Days
Date of report: 7-12-92 Time of report: 4:00 PM EDT
[Note: There was no report on 7-11-92]
On Saturday, 7/11, work continued on interfacing the Remote Launch
Equipment (RLE) with the KSC multiplexer system which enables
communication with the Spacecraft Checkout Station (SCS) in
Building AO. By the end of the day, the system was successfully
passing commands and telemetry between the PHSF (Payload Hazardous
Support Facility) and AO. The damaged 5 volt power supply was replaced.
It was discovered that the battery trickle charge power supplies were
also damaged in the improper power phase incident on Friday. They are
being replaced with units from the SCS. Checkout of the RLE continues
tonight.
The repeat of the TOS (Transfer Orbit Stage) interface test #1 with
the new adapter harness and the reworked test cable was completed
successfully. A TDR was written against an inadvertent removal of a
breakwire jumper during the test.
The helium tank is now at flight pressure.
After many days of trying to find the proper increments of
calibration weights at GE and KSC for the weight and center-of-
gravity cart calibration, a commercial weight vendor has been
enlisted to provide the required units. The proper weights arrived
this morning. A reconfiguration of the cart was required today
because of an improper initial setup. Calibration activities were
performed all day, and will run into tomorrow.
The spacecraft will be powered up for the first time in the PHSF
tomorrow. A dry run of the TOS interface test #2 will be
conducted. The real interface test between the spacecraft and
adapter to the TOS will be conducted on Tuesday. The weight for
center-of-gravity calibration will be calibrated at AstroTech
tomorrow. The spacecraft will be repositioned slightly to make room
for the oxidizer (NTO) container.
The spacecraft dry weight and center-of-gravity measurement will be
made on Wednesday.
The RLE power incident and the mass properties equipment
calibration issues have been responsible for a three day schedule
slip. It is still expected that this delay can be absorbed during
the fuel loading process, and the 8/2 date to mate with TOS will
not be impacted.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | In 1991 there were 16 names
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | listed on the FBI's ten
|_____|/ |_|/ |_____|/ | most wanted list.
Article: 1453
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 07/13/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Tue, 14 Jul 1992 07:01:23 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 65 Days
Date of report: July 13, 1992 Time of report: 5:00 PM EDT
Today the checkout of the recently repaired Remote Launch Equipment
was completed. The RLE is now ready to support spacecraft testing.
One of three calibration cycles has been completed on the weight
and center-of-gravity cart. It is expected that the remaining two
cycles will be completed tonight such that the weights can be returned
to the vendor. However, this may overlap into tomorrow morning.
The running of the MO/TOS (Mars Observer/Transfer Orbit State)
Interface Test #2 Dry Run (MO Only) and configuring of the latch
valves will be run on second shift this evening. The previously
scheduled MOSC13 DTR (Digital Tape Recorder) playback will not be run.
This DTR playback was adding too much to the test preparation and run
time and was dropped from tonight's activities. This will
allow the completion of tonight's activities such that the very
important MO/TOS I/F test #2 can be run all day Tuesday.
The spacecraft dry weight and center-of-gravity measurement is
still scheduled for Wednesday.
At LC-40 (Launch Complex 40) the Umbilical Mast/Mobile Service
Tower interference problem is being worked today such that the MST
can be brought around the launch vehicle and the work platforms
lowered into place. Time-lining of launch day activities and what
to do for the Launch Day Dress Rehearsal are yet to be determined.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | In 1991 there were 16 names
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | listed on the FBI's ten
|_____|/ |_|/ |_____|/ | most wanted list.
Article: 1462
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 07/14/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Wed, 15 Jul 1992 07:02:28 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITY STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 64 Days
Date of report: July 14, 1992 Time of report: 6:00 PM EDT
Two calibration cycles were completed yesterday on the weight and
center-of-gravity cart. Linearity and repeatability were reported
as excellent. Because the two runs were so good it was decided to
skip the third and move right into the weight and center-of gravity
of the 3500 pound test mass that was verified at Astrotech. This
is scheduled for this afternoon. This means we are still on schedule
for the weight and center-of gravity measurement Wednesday.
Spacecraft electrical activities scheduled yesterday, ie., battery
charging, MO/TOS (Mars Observer/Transfer Orbit State) Interface
test #2 Dry Run (MO only) and configuring of the latch valves was
not completed. This was due to configuration and procedural problems
and has been ironed out this morning. At the time of this writing
the spacecraft is cabled up, battery charging started and the MO/TOS
I/F test #2 Dry Run is underway. There is some expectation that the
GO-NOGO SEPET will be run this evening. Tomorrow we expect to run the
real MO/TOS I/F Test #2 and do the dry weighing of the spacecraft.
Propulsion activities are still on track for oxidizer loading on
Thursday. We have had some problem with sampling in that the
particulate count is out of spec which will require some additional
filtering.
The KSC PHSF (Payload Hazardous Support Facility) Water Deluge
Activation Plan for MO/TOS has been signed. Training associated with
this plan has been accomplished for thirteen JPL personal. There is
also a "how to" document prepared by JPL safety, plagiarized from Galileo,
with definitions and criteria for use of the system.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | In 1991 there were 16 names
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | listed on the FBI's ten
|_____|/ |_|/ |_____|/ | most wanted list.
Article: 1472
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 07/15/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Thu, 16 Jul 1992 06:18:46 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 63 Days
Date of report: 7-15-92 Time of report: 5:30pm EDT
The MO/TOS (Mars Observer/Transfer Orbit Stage) I/F test #2 dry
run (MO only) was successfully completed last night. The GO-NOGO
SEPET and the sequence to set and pressure check the latch valves
was not completed.
Mechanical activities to measure the weight and center-of-gravity
of the 3500 pound test mass are in process this afternoon. The
spacecraft dry WT&CG measurements are scheduled for tomorrow, Thursday.
A new 72-hour plan has been released which has slipped the start of
propulsion loading by one day, to Friday the 17th. However, this
replanning does not slip the spacecraft mate to the TOS on August
2nd. GE is working on a new 10 day schedule which should be out
tomorrow.
Activities to be accomplished in the next 24 hours includes the
real MO/TOS I/F test #2, the test to validate the RF power out of
the low gain transmit antenna (which should put to bed the
discrepant data taken in an earlier test), the GO-NOGO SEPET,
latch valve verification and pyro valve stray voltage checks.
Other mechanical activities, such as de-tensioning the V-band,
removing and installing red-tag items as part of Wt&CG, will be
carried on in parallel to electrical activity.
Propulsion activities are progressing, the one day slip will take
some of the pressure off this activity and allow us to get a good
clean smooth start. On Friday the oxidizer will be sampled and the
loading is scheduled for Saturday. On Sunday the oxidizer setup is
removed and fuel is brought in for the subsequent fuel loading cycle.
At the time of this writing, 5:30pm EDT, the I&T team is trouble
shooting a S/C (spacecraft) turn-on problem. It is thought to be
a set-up problem, ie., new configuration, and shortly we will be running.
Testing will continue tonight on items mentioned above, although
not necessarily in the order mentioned. Not to panic!
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | In 1991 there were 16 names
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | listed on the FBI's ten
|_____|/ |_|/ |_____|/ | most wanted list.
Article: 1478
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 07/16/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Fri, 17 Jul 1992 07:06:03 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 62 Days
Date of report: 7-16-92 Time of report: 5:00pm EDT
At the time of last nights status the I&T (Integration & Test)
team was troubleshooting a turn on problem associated with the MO/TOS
(Mars Observer/Transfer Orbit Stage) Interface test #2. This problem was
traced to a missing TITAN test tool which allows power to be supplied
from the RLE (Remote Launch Equipment) when we are not in the LC-40
(Launch Complex 40) configuration, ie., the RLE in room B-10 and the
spacecraft on top of the launch vehicle. As a result of this problem,
today's activities will include an end to end evaluation of the set-up,
led by the TOS integrator, configuring the test set-up properly, verifying
electrical integrity with the spacecraft simulator, then connect to the
spacecraft. If all goes well today, we will start the interface test with
the TOS and MO spacecraft first shift Friday.
Propulsion activities were slipped another day, ie., take the first
sample on Saturday and the oxidizer load on Sunday.
Activities last night did include running the test to verify the
low gain antenna transmit power, and the GO-NOGO SEPET. Electrical
tests to be run include the pyro stray voltage checks, setting and
verifying the latch valves and the PDS (Payload Data Subsystem) portion
of the GO-NOGO SEPET.
The WT&CG (weight & center of gravity) of the 3500 pound test mass was
completed last night. This measured the test mass to within plus or
minus 3 pound and within 20 mils of its CG. Initial assessment of the
results is very positive. Next step is to do the dry spacecraft,
following the MO/TOS I/F test on Friday.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Most of the things you
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | worry about will never
|_____|/ |_|/ |_____|/ | happen.
|
| 528.18 | Updates - July 17-23 | VERGA::KLAES | Slaves to the Metal Hordes | Fri Jul 24 1992 22:09 | 264 |
| Article: 1484
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Update - 07/17/92
Date: 18 Jul 92 07:45:19 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 61 Days
Date of report: July 17,1992 Time of report: 5:00pm EDT
Last nights activities went quite well. The checkout and
verification of the set up for the MO/TOS (Mars Observer/Transfer
Orbit Stage) I/F test with the spacecraft simulator and the spacecraft
was completed without any problems. This checkout with the spacecraft
included finishing the power on portion of the pyro stray voltage checks.
This morning the MO/TOS I/F test is being held up by a combination
of communication problems between Hanger AO and the PHSF (Payload
Hazardous Support Facility), and the spacecraft checkout station. There
has been a several pronged approach to the problem, ie., the ability to
load the spacecraft memories, involving the KSC/CAPE communication support
people, GE engineering at GE-ASD and Hanger AO. The CAPE communication
engineers have proposed a fix to provide a more stable command and
bit sync interface to the GE equipment. This will be installed and
evaluated later this evening.
The MO/TOS I/F test has now been rescheduled to noon Saturday.
The previously scheduled mechanical activities to rotate the
spacecraft, set up to de-tension the V-band have been scheduled for
tonight as well as the dry WT&CG (weight & center of gravity) of the
spacecraft.
Propulsion activities are on schedule for sampling of the oxidizer
Saturday and loading on Sunday.
There has been some concern with the ability of the Mars Observer
Spacecraft to meet the August 2nd mate to the TOS. The next ten
days of schedule have been evaluated and the completion of the
propulsion loading activities still leaves us with the same amount
of time to complete spacecraft preparations, prior to mating to the
TOS. All electrical testing with the spacecraft, so far, has been
successful, ie., no spacecraft problems. Extra effort is being
applied to the planning and table toping of operations, such that
configuration problems that were encountered with the I/F test can
be eliminated. In addition to the daily I/F meetings with the TOS
community we will be starting similar meeting with the TITAN community.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Most of the things you
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | worry about will never
|_____|/ |_|/ |_____|/ | happen.
Article: 1505
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Update - 07/20/92
Date: 21 Jul 92 07:16:44 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 58 Days
Date of report: 7-20-92 Time of report: 6:00 pm EDT
Continued problems with loading the spacecraft's computers through
the lines from Building AO to the Remote Launch Equipment in the
PHSF (Payload Hazardous Support Facility) have caused a continuing
delay in running the MO/TOS (Mars Observer/Transfer Orbit Stage)
interface test number 2. At this writing, the communication problem
has not been solved. GE is bringing in additional technical support
from New Jersey and JPL is bringing in additional technical support
from Pasadena.
The spacecraft weight and center-of-gravity measurements were made
Friday night.
Because fuel loading is the critical path in the spacecraft
operations leading to the August 2nd mate with the TOS, the
decision was made to proceed with fueling in lieu of completing the
MO/TOS interface test. The oxidizer sampling was completed
Saturday, and the oxidizer was loaded and pressurized on Sunday.
Trouble shooting of the computer loading problem will continue
tonight. Fuel (MMH) sampling will be conducted tomorrow morning.
If the computer loading problem is solved, the interface test could
be run tomorrow afternoon. Fuel loading is planned for Wednesday.
On the west coast front, the Verification Test Laboratory (VTL)
arrived at JPL on Saturday morning, and was up and running today.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Most of the things you
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | worry about will never
|_____|/ |_|/ |_____|/ | happen.
Article: 1511
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 07/21/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Wed, 22 Jul 1992 07:14:34 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 57 Days
Date of report: 7-21-92 Time of report: 6:00 pm EDT
Sampling of the fuel (MMH) was accomplished this morning, and after
some difficulty with a contaminated container, the sample was sent
to the lab for analysis late this afternoon. If the results are
positive, fueling will start early tomorrow morning and continue
all day.
Trouble shooting of the communications problems between the
spacecraft computers and the spacecraft checkout station continued
this afternoon. At this writing, commands had been successfully
transferred in a configuration that bypassed the TOS (Transfer Orbit
Stage) adapter harness, the TOS and the Titan III support equipment.
This is not the configuration required for the TOS interface test, but
is a condition where we had been successful in transferring commands
previously. Several backup paths involving RF links and alternate
data paths are being readied as contingencies.
Planning for spacecraft mechanical closeout (final flight
preparations of blankets, cables, etc.) activities is underway.
As the result of the recent failure of a Gates battery in the GRO
spacecraft, and potential battery decisions by the TOPEX project,
an activity has been started to understand the implications of a
possible change out of Mars Observer's Gates batteries for the
Super NiCd Eagle-Pritcher batteries previously purchased for
contingency purposes.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Most of the things you
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | worry about will never
|_____|/ |_|/ |_____|/ | happen.
Article: 1522
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 07/22/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Thu, 23 Jul 1992 06:31:12 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 56 Days
Date of report: 7-22-92 Time of report: 5:50 pm EDT
Work on the communications problem between the spacecraft computers
and the spacecraft checkout station seems to have been solved by
bypassing the KSC provided multiplexer/demultiplexer system with
four hard wire circuits to carry the command data and associated
clock signals. Successful loads of the spacecraft computers were
accomplished last night.
A tiger team has been put in place to assess, and correct if
required, the potential for a similar communications problem with
the spacecraft on launch complex 40.
MMH fueling has been completed and the crew is finishing cleanup
operations at this time.
As soon as the high bay is available for electrical work, the
cables to the TOS (Transfer Orbit Stage) adapter and to the TOS
will be replaced to further validate readiness for the MO/TOS interface
test #2 which is now scheduled for Thursday afternoon.
Hydrazine sampling is scheduled for Thursday morning.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Most of the things you
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | worry about will never
|_____|/ |_|/ |_____|/ | happen.
Article: 1535
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 07/23/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Fri, 24 Jul 1992 06:39:53 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 55 Days
Date of report: 7-23-92 Time of report: 6:00 pm EDT
Sampling of the hydrazine was completed this morning. The MO/TOS
(Mars Observer/Transfer Orbit Stage) interface test was started
during the afternoon and is continuing well at this writing.
Work by the tiger team on the communications problem that prevent
reliable loading of the spacecraft has revealed a noisy leading
edge on the data and clock signals. The circuit is being
breadboarded by JPL to confirm the hypothesis and to test several
potential fixes. These fixes may solve any potential problem that
is waiting to be found in the launch pad configuration. In
addition, a method to sync the multiplexer to the data clock has
been discovered which may improve the performance of the
multiplexer/demultiplexer system.
Loading of the hydrazine is scheduled for tomorrow morning, to be
followed by a PDS (Payload Data Subsystem) GO/NO GO and checkout of
the pyro circuits in the new adapter harness.
The Project is organizing a review of the MO battery situation as
the result of the GRO battery failure and the recent TOPEX battery
review. This MO battery review is scheduled for Tuesday morning,
July 28, 1992.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Most of the things you
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | worry about will never
|_____|/ |_|/ |_____|/ | happen.
|
| 528.19 | Updates - July 24-30 | VERGA::KLAES | Slaves to the Metal Hordes | Fri Jul 31 1992 21:17 | 223 |
| Article: 1541
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 07/24/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Sat, 25 Jul 1992 05:56:51 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 54 Days
Date of report: 7-24-92 Time of report: 5:00 pm EDT
The MO/TOS (Mars Observer/Transfer Orbit Stage) interface test #2
was completed last night without problem.
The hydrazine sample taken yesterday was analyzed last night and
found to fail the particulate count requirement. In addition, a
red powdery residue was obtained from the filter paper. Hydrazine
loading was not started this morning as scheduled.
A second set of samples was taken this morning from further
downstream in the loading cart after the final filter. One of
these samples passed the particulate count test (the other failed
by only one count), and thus the test was considered successful.
No red residue was detected. The chem lab assumes (from prior
experience) that the contaminate came from a dirty cart and was
filtered out by the final filter. The final samples appeared as
the lab expected. Analysis of the residue will be made. Hydrazine
loading was then begun about 4 pm.
The adapter harness pyro circuit test previously scheduled for
tonight, will be conducted tomorrow afternoon. The remainder of
the weekend will be used for starting the final mechanical closeout
operations, and readying support equipment for mating to the TOS
adapter.
Weighing of the spacecraft in the fueled condition is scheduled for
Monday, and mating to the TOS adapter is scheduled on Tuesday.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Most of the things you
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | worry about will never
|_____|/ |_|/ |_____|/ | happen.
Article: 1557
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Update - 07/27/92
Date: 28 Jul 92 07:43:27 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 51 Days
Date of report: 7-27-92 Time of report: 5:00 pm EDT
[There were no reports on 7/25 and 7/26.]
Mechanical closeout and mechanical support equipment readiness
operations were accomplished over the weekend. The pyro circuits
in the TOS (Transfer Orbit Stage) adapter harness were checked.
The adapter bushings were fit checked and some additional analysis
needs to be performed relative to their clearances.
Preparations for and measurement of the wet mass and center-of-
gravity determination were conducted today.
The battery review telecon will be held tomorrow morning.
Mating to the TOS adapter is scheduled for late tomorrow.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Most of the things you
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | worry about will never
|_____|/ |_|/ |_____|/ | happen.
Article: 1560
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Update - 07/28/92
Date: 29 Jul 92 05:56:48 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 50 Days
Date of report: 7-28-92 Time of report: 4:40 PM EDT
The wet weight and center-of-gravity measurements were completed
last night. Today's operations were concerned with the post
measurement re-calibration of the weight and cg fixture and
preparing for the mating to the TOS (Transfer Orbit Stage) adapter.
Actual mate to the adapter is scheduled for later tonight. Tensioning
of the V-band will occur on Wednesday, to be followed by additional
mechanical closeouts.
The Battery Review teleconference was held this afternoon, and
resulted in a decision to fly the currently installed Gates batteries.
TOS is working an interface problem with Titan involving the
engagement of the locking feature of the nutplate which secures the
TOS to the Titan. The worst case result of this problem will
require changing out of the bolts in this joint and a resultant one
day delay in the scheduled MO mate to TOS. This issue should be
solved tomorrow when any schedule impact should be known.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Most of the things you
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | worry about will never
|_____|/ |_|/ |_____|/ | happen.
Article: 1580
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Update - 07/29/92
Date: 30 Jul 92 07:52:09 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 49 Days
Date of report: 7-29-92 Time of report: 7:00 PM EDT
Progress toward mating with the TOS (Transfer Orbit Stage) adapter
has been slowed by an absence of an approved procedure and difficulty
in leveling the dolly and the spacecraft lifting fixture. Mate to
the adapter, which was scheduled for late yesterday, was finally
accomplished at 6:00 pm this evening. The workhorse v-band was
installed for the night, and the flight v-band and catchers will
be installed tomorrow. The release pyros will be installed on
Friday, and the PDS (Payload Data Subsystem) GO/NO-GO test will be
slipped to Friday evening.
The Titan payload fairing arrive at the PHSF (Payload Hazardous
Support Facility) tomorrow morning.
An informal ready to mate with the TOS review was held between
JPL/MSFC/GE/OSC/MMAG this afternoon. The result was that the
vehicles are ready to mate if all the work scheduled between now
and Saturday evening is accomplished. For the spacecraft, this
includes many mechanical closeout items in addition to the tasks
listed in the first paragraph of this report. A slight schedule
uncertainty still exists relative to TOS's problem with the bolts
(do they properly engage the locking feature of their nuts) in
their interface with Titan. However, mating is still scheduled for
Sunday, August 2nd.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Most of the things you
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | worry about will never
|_____|/ |_|/ |_____|/ | happen.
Article: 1587
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 07/30/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Fri, 31 Jul 1992 06:31:38 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 48 Days
Date of report: 7-30-92 Time of report: 6:00 pm EDT
Installation of the flight v-band was accomplished today.
Additional mechanical closeouts, installation of the v-band catcher
assemblies, thermal blanket adjustments and a spacecraft power-on
are scheduled for tomorrow. While the spacecraft is on, the PDS
(Payload Data Subsystem) GO/NO-GO test, a check of the SCP (Standard
Controls Processor) RAM's and closing two propulsion latch valves will
be accomplished.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Most of the things you
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | worry about will never
|_____|/ |_|/ |_____|/ | happen.
|
| 528.20 | Mars Observer mated to Transfer Orbit Stage at KSC | PRAGMA::GRIFFIN | Dave Griffin | Tue Aug 04 1992 02:06 | 58 |
| George H. Diller August 3, 1992
Kennedy Space Center
Bob MacMillin
Jet Propulsion Laboratory
KSC Release No. 105-92
The Mars Observer spacecraft was successfully mated today to
its upper stage, the Transfer Orbit Stage (TOS), passing a major
schedule milestone in processing. An Interface Verification Test
(IVT) to verify the connections between the two flight elements
is scheduled for Tuesday, Aug. 4.
"As challenges in processing have come along, our teams have
been willing to do what was necessary to have this milestone
happen as close to schedule as possible," said Glenn Cunningham,
Mars Observer deputy project manager from the Jet Propulsion
Laboratory.
Later this week, the TOS will be fueled with its hydrazine
attitude control propellant. Next week, closeout activities of
the integrated payload stack will begin. The encapsulation into
the Titan III nose fairing is scheduled for Aug. 13, and the
transfer from KSC's Payload Hazardous Servicing Facility to
Launch Complex 40 for mating to the Titan III is scheduled for
Aug. 17.
All activities are currently on schedule for a liftoff of
Mars Observer at the beginning of the planetary launch
opportunity on Sept. 16, 1992. The launch window extends from
1:02 p.m. to 2:34 p.m. The planetary launch opportunity ends on
Oct. 13.
Mars Observer will be the first U.S. mission launched to
Mars since the Viking program in 1975. From a circular Martian
polar orbit of 250 miles, it will create a detailed global
portrait of the planet. The spacecraft will map the surface and
study Mars geology while profiling its atmosphere and weather.
The mission is designed to span one Martian year, or 687 earth
days.
The Mars Observer project is managed for NASA by the Jet
Propulsion Laboratory, Pasadena, California and the spacecraft is
built by General Electric Astrospace Division, East Windsor, N.J.
NASA's Marshall Space Flight Center, Huntsville, Ala. is project
manager for the TOS upper stage, which is built by Orbital
Sciences Corporation of Fairfax, VA. The Titan III project is
managed by NASA's Lewis Research Center, Cleveland, Ohio. The
launch vehicle and launch services are provided by Martin
Marietta Astronautics Division, Denver, Colo. NASA's Office of
Space Science and Applications at NASA Headquarters in
Washington, D.C. has overall program management responsibility
for Mars Observer.
|
| 528.21 | Updates - July 31 to August 6 | VERGA::KLAES | Slaves to the Metal Hordes | Fri Aug 07 1992 20:29 | 378 |
| Article: 1601
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 07/31/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Sat, 1 Aug 1992 07:00:43 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 47 Days
Date of report: 7-31-92 Time of report: 6:15 PM EDT
The waiver allowing transport of the bi-prob tanks with the flight
blowdown pressure levels has been approved by Range Safety. The
tanks were pressurized based on a helium absorption rate which will
make the tank pressures at the value specified in the waiver by the
time of transport to the launch complex.
A missing file precluded loading the new flight software version 6D
and running the PDS (Payload Data Subsystem) GO/NO-GO test today.
A problem with the apparent rotation of the flight v-band after
tensioning has prevented installation of the v-band catcher
assemblies. This will require releasing the tension and
repositioning the v-band tomorrow, and puts too much required
serial work (installation of the catchers and v-band pyros) before
the scheduled mate to TOS (Transfer Orbit Stage) on Sunday.
Therefore, the mate to TOS has been slipped to Monday.
If the mate to TOS can be accomplished on the first shift Monday
and the interface test completed on second shift, then there will
be no schedule lost.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Most of the things you
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | worry about will never
|_____|/ |_|/ |_____|/ | happen.
Article: 1620
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Mated to Transfer Orbit Stage
Date: 4 Aug 92 03:39:43 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
George H. Diller August 3, 1992
Kennedy Space Center
407/867-2468
Bob MacMillin
Jet Propulsion Laboratory
818/354/5011
KSC Release No. 105-92
MARS OBSERVER MATED TO TRANSFER ORBIT STAGE AT KSC
The Mars Observer spacecraft was successfully mated today to
its upper stage, the Transfer Orbit Stage (TOS), passing a major
schedule milestone in processing. An Interface Verification Test
(IVT) to verify the connections between the two flight elements
is scheduled for Tuesday, Aug. 4.
"As challenges in processing have come along, our teams have
been willing to do what was necessary to have this milestone
happen as close to schedule as possible," said Glenn Cunningham,
Mars Observer deputy project manager from the Jet Propulsion
Laboratory.
Later this week, the TOS will be fueled with its hydrazine
attitude control propellant. Next week, closeout activities of
the integrated payload stack will begin. The encapsulation into
the Titan III nose fairing is scheduled for Aug. 13, and the
transfer from KSC's Payload Hazardous Servicing Facility to
Launch Complex 40 for mating to the Titan III is scheduled for
Aug. 17.
All activities are currently on schedule for a liftoff of
Mars Observer at the beginning of the planetary launch
opportunity on Sept. 16, 1992. The launch window extends from
1:02 p.m. to 2:34 p.m. The planetary launch opportunity ends on
Oct. 13.
Mars Observer will be the first U.S. mission launched to
Mars since the Viking program in 1975. From a circular Martian
polar orbit of 250 miles, it will create a detailed global
portrait of the planet. The spacecraft will map the surface and
study Mars geology while profiling its atmosphere and weather.
The mission is designed to span one Martian year, or 687 Earth
days.
The Mars Observer project is managed for NASA by the Jet
Propulsion Laboratory, Pasadena, California and the spacecraft is
built by General Electric Astrospace Division, East Windsor, N.J.
NASA's Marshall Space Flight Center, Huntsville, Ala. is project
manager for the TOS upper stage, which is built by Orbital
Sciences Corporation of Fairfax, VA. The Titan III project is
managed by NASA's Lewis Research Center, Cleveland, Ohio. The
launch vehicle and launch services are provided by Martin
Marietta Astronautics Division, Denver, Colo. NASA's Office of
Space Science and Applications at NASA Headquarters in
Washington, D.C. has overall program management responsibility
for Mars Observer.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | You can't hide brocolli in
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | a glass of milk -
|_____|/ |_|/ |_____|/ | anonymous 7-year old.
Article: 1621
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Activity Sheet
Date: 4 Aug 92 03:42:22 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Payload Test and Activity Sheet
Mars Observer
August 3, 1992
George H. Diller
Kennedy Space Center
407/867-2468
Spacecraft: Mars Observer
Upper Stage: Transfer Orbit Stage (TOS)
Vehicle: Titan III
Launch Pad: Complex 40
Launch Date: September 16, 1992
Launch Window: 1:02-2:34 p.m. EDT
Azimuth: 93 - 108 degrees
Launch Opportunity: 9/16-10/13 (24 days)
* denotes change since last status
UPCOMING ACTIVITY:
8/03 TOS/Mars Observer IVT *
8/08 TOS fueling *
8/09 MO/TOS closeouts (thru 8/12) *
8/13 Begin payload encapsulation activites PHSF (thru 8/16)
8/17 Move payload to Complex 40 and erect
8/26 Operational Readiness Test and Network Simulation
8/29 Countdown Dress Rehearsal T-0
9/08 Launch vehicle/payload Combined Systems Test (CST)
9/09 Launch vehicle ordnance installation
9/11 Load vehicle oxidizer
9/12 Load vehicle fuel
9/14 Range Safety command checks
9/15 Launch vehicle pressurization
9/16 Begin terminal count 4:32 a.m.
ACTIVITY COMPLETE:
1/10 TOS arrives PHSF
2/28 Titan III vehicle arrives at VIB
3/14 Engines Arrive
3/15 Begin solid rocket booster build-up
3/16 Install Titan 2nd Stage Engine
3/17 Install Titan 1st Stage Engines
3/26 Vehicle erection in Vehicle Integration Building (VIB)
5/18 Titan solid rocket build-up complete
6/15 Ship Mars Observer
6/19 Spacecraft arrival Hangar AO
6/22 Titan core vehicle Combined Systems Test (CST)
6/24 Move Titan core to Solid Motor Assembly Building
6/30 Titan/SRB mate complete
6/28 Mars Observer propulsion system leak checks
6/30 Solid rocket booster mating to core vehicle complete
7/02 Move Titan III to Launch Complex 40
7/03 Mars Observer Deep Space Network compatability test
7/08 Complete spacecraft subsystem testing
7/09 Mars Observer move from AO to PHSF
7/24 Mars Obsever fueling
7/25 Spacecraft pressurization
7/27 Spacecraft weight and balance
8/01 Mate spacecraft to Titan III adapter
8/03 Mate spacecraft to TOS upper stage
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | You can't hide brocolli in
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | a glass of milk -
|_____|/ |_|/ |_____|/ | anonymous 7-year old.
Article: 1629
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 08/03/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Tue, 4 Aug 1992 06:05:03 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 44 Days
Date of report: 8-3-92 Time of report: 4:30 PM EDT
Friday evening it was reported that the V-band tensioning had to be
redone on Saturday, which caused a one day slip of the Mars
Observer spacecraft mate to the TOS (Transfer Orbit Stage). The
V-band was re-tensioned successfully on Saturday, no slippage, and
on Sunday miscellaneous closeouts, installation of pyros and blanketing
was accomplished. Today, Monday the spacecraft was mated to the TOS,
and at the time of this writing, the bolts are in and being torqued.
Tomorrow, Tuesday, the MO/TOS I/F test number 3 will be run, starting
at noon. This is expected to be accomplished in 6 to 8 hours.
Looking ahead, it is expected that the start of encapsulation will
start on time, the 13th, and that we will be able to move to the
LC-40 (Launch Complex 40) on the 17th, as planned.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | You can't hide broccoli in
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | a glass of milk -
|_____|/ |_|/ |_____|/ | anonymous 7-year old.
Article: 1637
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 08/04/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Wed, 5 Aug 1992 07:43:38 GMT
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 43 Days
Date of report: 8-4-92 Time of report: 5:00pm EDT
During last nights attempt to verify spacecraft operation prior to
running the MO/TOS (Mars Observer/Transfer Orbit Stage) I/F test #3
a problem was encountered while attempting to run in the "umbilical
mode". Trouble shooting revealed a problem in the ground circuits
associated with the Remote Launch Equipment (RLE). Subsequent
analysis/trouble shooting and isolating a power switch in the RLE
has solved the problem and the spacecraft can be operated in the
"umbilical mode". This coupled with final installation of the
flight brackets, associated with interface connectors, has postponed
the I/F test until tomorrow.
TOS operations associated with the fueling of their propulsion
system will proceed early in the morning and then the I/F test will
be run starting at noon. Certainly, some pad or schedule slack has
been used up, but, transport of the payload to the pad on August
17th is still on track.
Toward the end of the week we will be transporting the RLE to LC-40
(Launch Complex 40) to perform end to end tests, with the spacecraft
simulator, to assure ourselves that we have a working system, ie.,
from the spacecraft checkout station in Hanger AO, through the various
communication paths to the LC-40, such that reliable operation of
the spacecraft on the pad can be achieved. The RLE will then be
transported back to the PHSF (Payload Hazardous Support Facility)
for final electrical operations there.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | You can't hide broccoli in
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | a glass of milk -
|_____|/ |_|/ |_____|/ | anonymous 7-year old.
Article: 1654
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Update - 08/05/92
Date: 6 Aug 92 07:59:07 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 42 Days
Date of report: 8-5-92 Time of report: 6:45pm EDT
TOS (Transfer Orbit Stage) propulsion subsystem activities started
with the loading of the fuel cart this morning. Propulsion operations
will continue the rest of this week, including a sample from the
loading cart on Friday, and the fueling of the TOS on Saturday.
The MO/TOS I/F test #3, is getting a late start tonight due to
thunderstorm activity. Weather permitting, the I/F test should be
complete by midnight. If there is a problem tonight and the I/F test
cannot be run or completed, I will put out an update in the morning.
Activities associated with the TITAN III fairing have started at
the PHSF (Payload Hazardous Support Facility), ie., cleaning of
the two halves and installing them in there respective strongbacks,
for raising to the vertical position.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | You can't hide broccoli in
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | a glass of milk -
|_____|/ |_|/ |_____|/ | anonymous 7-year old.
Article: 1661
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 08/06/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Fri, 7 Aug 1992 06:00:58 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 41 Days
Date of report: 8-6-92 Time of report: 5:00pm EDT
Last night the MARS OBSERVER/TOS (Transfer Orbit Stage) I/F test #3
was successfully completed. There were no show stoppers and the
TOS will continue toward fueling on Saturday.
Tests being run today on the spacecraft include battery charging,
verification of the sun sensor, that was repositioned, and the PDS
(Payload Data Subsystem) GO-NOGO test.
Also accomplished today was a detailed walk around for the purpose
of final closeouts on the spacecraft. Participants included Frank
Locatell of JPL, Ged Faubion and Ed Mutschler of GE. The report
was good, items to be corrected are documented and will be worked
off. No show stoppers!
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | You can't hide broccoli in
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | a glass of milk -
|_____|/ |_|/ |_____|/ | anonymous 7-year old.
|
| 528.22 | Updates - August 7-14 | VERGA::KLAES | Slaves to the Metal Hordes | Fri Aug 14 1992 20:59 | 418 |
| Article: 1672
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 08/07/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Sat, 8 Aug 1992 07:42:04 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 40 Days
Date of report: 8-7-92 Time of report: 6:00 PM EDT
Mechanical closeouts of the spacecraft continued today.
Investigation of an anomalous DTR (Digital Tape Recorder) telemetry
reading was made with a partial re-run of the TOS (Transfer Orbit
Stage) interface test to create the conditions in which the anomalous
reading was observed. No results have been reported as of this writing.
The v-band pyros were mated successfully.
Two force washers (washers with strain gages attached to measure
tension in the release mechanism cables) were found to have open
resistance readings which imply a lack of tension. It is suspected
that the connections to the strain gages were damaged. A
mechanical torque measurement will be attempted to confirm that the
release system is intact.
The RLE (Remote Launch Equipment) will be moved to the pad tomorrow
morning and electrical measurements will be made of the command
signal waveform to assure that the SCP (Standard Controls Processor)
loading problem experienced in the PHSF (Payload Hazardous Support
Facility) will not reoccur on the pad. Telemetry flow tests from the
spacecraft simulator to the checkout station will also be made over the
weekend. A slight delay in readying the cables for the RLE at the pad
was incurred when the connector lugs were found to be of the wrong size.
TOS installed their battery today, and will load fuel tomorrow.
Several items of concern regarding the Titan readiness have come to
light. Two of the items relate to generic Titan issues on command
destruct receivers and the safe and arm device on the SRMs (Solid
Rocket Motors). A third relates to higher loads on the shaped
destruct charges. Appropriate paperwork needs to be closed by
August 14th or Range Safety may declare the launch red. Final
trajectory tapes from Martin are required for a decision on how to
handle launch azimuths between 104 and 108 degrees. A clear of
the CCAFS (Cape Canaveral Air Force Facility) industrial area
might be required. The SRM corrosion/debonding problem that caused
the recent removal of a Titan IV from LC-41 (Launch Complex 41) may
still hold some concern for us. We are watching these issues closely.
More data will be reported as it becomes available.
An informal re-encapsulation review is scheduled for Monday, August 10.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | You can't hide broccoli in
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | a glass of milk -
|_____|/ |_|/ |_____|/ | anonymous 7-year old.
Article: 1678
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Media Showing of Mars Observer
Date: 11 Aug 92 02:39:25 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
George Diller August 10, 1992
Kennedy Space Center
407/867-2468
Bob MacMillin
Jet Propulsion Laboratory
818/354-5011
Jerry Berg
Marshall Space Flight Center
205/544-6540
KSC Release No. 106-92
KSC SCHEDULES MEDIA SHOWING OF MARS OBSERVER/TRANSFER ORBIT STAGE
The Mars Observer spacecraft and the Transfer Orbit Stage,
or TOS upper stage, have been fueled and tested are ready to be
mated to the Titan III launch vehicle. The integrated payload
elements are presently being prepared for encapsulation into the
Titan III nose fairing, scheduled to occur later this week.
A payload showing for news media representatives is
scheduled to be held at KSC on Thursday, Aug. 13, at the Payload
Hazardous Servicing Facility (PHSF). The event is timed to occur
shortly after all access platforms have been removed from around
the spacecraft and immediately before the encapsulation
activities begin.
Transportation will be furnished. Media representatives
should be at the KSC News Center at 7:30 a.m. Upon arrival at
the PHSF, participants will be taken inside the high bay clean
room to view and photograph the Mars Observer spacecraft and
associated TOS upper stage. Payload officials will be on hand
for interviews and to answer questions.
Because of the sensitivity of partially exposed optics on
the spacecraft, no flash photography will be permitted in the
PHSF high bay. Available facility light must be used, which is
sodium vapor having a characteristic orange cast.
Required clean room attire will be furnished. Some
photography equipment may be identified by quality control
personnel to be wiped down. The necessary alchohol wipes will be
furnished. No leather or vinyl cases are permitted; special
plastic bags will be provided for extra lenses, film or other
accessories. All camera equipment should be self contained as no
AC power is available. Pants and closed-toe shoes are required;
no shorts are allowed. Also, no matches, lighters, tobacco
products, food or drink are allowed in the clean room.
Those requiring accreditation should contact the KSC News
Center at 407/867-2468 before the close of business on Wednesday,
August 12.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | You can't hide broccoli in
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | a glass of milk -
|_____|/ |_|/ |_____|/ | anonymous 7-year old.
Article: 1679
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 08/10/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Tue, 11 Aug 1992 08:08:33 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 37 Days
Date of report: 8-10-92 Time of report: 6:00 PM EDT
[Note: There were no reports on 8-8-92 and 8-9-92]
Progress toward encapsulation continues well in the mechanical area
but with some delays in electrical testing.
Over the weekend, the RLE (Remote Launch Equipment) was moved to
the B-10 room in the LC-40 (Launch Complex 40) AGE building for
its initial checkout at the pad. Incorrect connector lugs, missing
cables, and uncompleted communications circuits contributed to not
being able to accomplish the objective of flowing telemetry, command
and control data between the pad and AO. The RLE was moved back to
the PHSF (Payload Hazardous Support Facility) to support the remaining
electrical tests on Monday morning. The remaining window for RLE
checkout on the pad is August 15 - 17. We have established that
proper operation of the RLE is a constraint on the transport of the
encapsulated spacecraft to the pad.
Proper tension in the GRS (Gamma Ray Spectrometer) release mechanism
cables was established with a torque wrench in lieu of the open
circuited force washers.
A special test with TOS (Transfer Orbit Stage) which tried to recreate
the anomalous 5 v telemetry from DTR #2 (Digital Tape Recorder)
produced negative results. The anomaly cannot be recreated. This
is believed to be a telemetry problem, not a DTR problem, and thus will
not a considered a red flag item.
Two full days of mechanical closeouts are ahead today and Tuesday.
The MOLA (Mars Observer Laser Altimeter) mirror was cleaned, and
closeouts of the MAG/ER (Magnetometer/Electron Reflectometer) were
performed. Spacecraft cleaning will be performed as necessary.
The final inspections will be performed tomorrow with the
completion of the removal of non-contamination critical red tag
items. The work platforms will be removed on Wednesday, and
encapsulation begins on Thursday.
Remaining electrical tests include the sun sensor stimulator test,
the PDS (Payload Data Subsystem) GO/NO-GO test, SCP (Standard
Controls Processor) RAM check, and battery charging. The
countdown recycle procedure practice will be deferred once again.
The Project held an in-formal pre-encapsulation review this
afternoon. Fourteen action items resulted, five of which are
critical to the encapsulation process. A criteria for
encapsulation was established: all mechanical closeouts complete,
all red tag items removed, all green tag items installed, the solar
array sun sensor stimulator test performed, and the battery
charged. The Titan chaired pre-encapsulation review will be held
on Wednesday morning.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | You can't hide broccoli in
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | a glass of milk -
|_____|/ |_|/ |_____|/ | anonymous 7-year old.
Article: 1684
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Update - 08/11/92
Date: 12 Aug 92 07:23:30 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 36 Days
Date of report: 8-11-92 Time of report: 6:00 PM EDT
Almost all pre-encapsulation electrical and mechanical items have
been completed and the spacecraft is ready to be committed to the
encapsulation process. A loose blanket on the PMIRR (Pressure
Modulator Infrared Radiometer) must be repaired tomorrow. This
was discovered after removing the PMIRR's soft cover this afternoon.
The sun sensor stimulator, the PDS (Payload Data Subsystem) GO/NO-GO
and the SCP (Standards Control Processor) RAM check tests were completed.
Completion of these tests were constraints to encapsulation. The final
mechanical closeouts and deployment inspections were completed
successfully. All the non-contamination critical red tag items
have been removed. The MOLA (Mars Observer Laser Altimeter), MOC
(Mars Observer Camera) and TES (Thermal Emission Spectrometer) covers
will be removed during the encapsulation process on Saturday, 8/15.
There was an inadvertent, and undetected in real-time, spacecraft
power up yesterday evening which left the spacecraft in the safe
mode. An error was made during the reconnection of the RLE (Remote
Launch Equipment) in which a clip lead that was necessary to provide
a signal ground was inadvertently level in place when the spacecraft
was connected. This lead provided a current path for the spacecraft
battery. The power was one for a little more than five minutes until
Safe mode commanded heaters and wheels on which drew enough current
to cause the small clip lead wire to burn open. Subsequent spacecraft
electrical testing verified that there was no damage to the
spacecraft, and the relays which were set by Safe mode were reset
to their proper positions. The operations which lead to this
incident will be required one more time (when the RLE is finally
installed at LC-40 (Launch Complex 40)). Procedures have been modified
to prevent a reoccurrence of this incident at that time.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | You can't hide broccoli in
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | a glass of milk -
|_____|/ |_|/ |_____|/ | anonymous 7-year old.
Article: 1686
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 08/12/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Thu, 13 Aug 1992 08:22:18 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 35 Days
Date of report: 8-12-92 Time of report: 6:00 PM EDT
The PMIRR (Pressure Modulator Infrared Radiometer) thermal blanket
was repaired this morning.
The Pre-Encapsulation Review was held this morning. The spacecraft
has no liens on encapsulation. TOS (Transfer Orbit Stage) has two
liens. One lien concerns the possible overtest of the side A TVC
(Thrust Vector Control) actuator, and the second concerns unknown
damage as the result of a short to a hot terminal on the motor
driven switch. Both of these items are expected to be closed out
by 10 PM tonight.
The work platforms have been removed from around the spacecraft.
The Titan payload fairing support equipment has been brought into
the PHSF (Payload Hazardous Support Facility) high bay in
preparation for the beginning of the encapsulation procedure which
is scheduled to start at 6 AM tomorrow.
An extensive effort is being planned to support the installation of
the RLE (Remote Launch Equipment) at LC-40 (Launch Complex 40) and
its associated data flow between LC-40 and AO over the coming weekend
to assure readiness for the spacecraft at the pad.
Encapsulation is scheduled for Saturday, August 15, at which time
the MOLA (Mars Observer Laser Altimeter), MOC (Mars Observer Camera)
and TES (Thermal Emission Spectrometer) covers will be removed.
Transport to the launch complex is still expected the night of
Monday, August 17.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | You can't hide broccoli in
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | a glass of milk -
|_____|/ |_|/ |_____|/ | anonymous 7-year old.
Article: 1707
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 08/13/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Fri, 14 Aug 1992 06:19:59 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 34 Days
Date of report: 8-13-92 Time of report: 5:30 PM EDT
The encapsulation process began today. TOS (Transfer Orbit Stage)
has declared that their shorted motor driven switch terminal and
TVC (Thrust Vector Control) actuator overtest concerns are not
constraints on encapsulation (however, they maybe constraints on
transport to LC-40 (Launch Complex 40)). The Titan payload fairing
extension module assembly was put in place at 4:30 PM.
Work on installation of cabling at LC-40 continued until the pad
was closed by lightning at 2:30 PM.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | You can't hide broccoli in
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | a glass of milk -
|_____|/ |_|/ |_____|/ | anonymous 7-year old.
Article: 1711
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Science Briefing
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Sat, 15 Aug 1992 02:21:40 GMT
Donald L. Savage
Headquarters, Washington, D.C. Aug. 14, 1992
(Phone: 202/453-8400)
NOTE TO EDITORS: N92-74
MARS OBSERVER SCIENCE BRIEFING SCHEDULED AUG. 19
A media briefing focusing on the scientific aspects of NASA's
upcoming Mars Observer mission is scheduled for 1 p.m. EDT, Wednesday,
Aug. 19, 1992. The briefing will be held in the 6th floor auditorium
(rm. 6004), 400 Maryland Ave., S.W., Washington, D.C.
Mars Observer is set for launch Sept. 16 from Cape Canaveral Air
Force Station, Fla. The spacecraft will be launched aboard a Titan
III rocket with a Transfer Orbit Stage upper stage. Following an
11-month cruise, the spacecraft will enter orbit around Mars. The
spacecraft will use its 7 instruments to make a comprehensive and
detailed study of the planet's atmosphere, surface and interior over
the course of 1 full Martian year (687 Earth days). Mars Observer is
the first U.S. mission to Mars since Viking in 1976.
Participants will be:
% Dr. Wesley Huntress, Director, Solar System sExploration Division,
NASA Headquarters, Washington, D.C.
% Dave Evans, Project Manager, Jet Propulsion Laboratory,
Pasadena, Calif.
% Arden Albee, Project Scientist, California Institute of Technology,
Pasadena, Calif.
% Michael Malin, Principal Investigator, Mars Observer Camera,
Malin Space Science Systems, San Diego, Calif.
% Michael Carr, Interdisciplinary Scientist, Geosciences,
U.S. Geological Survey, Menlo Park, Calif.
% Andrew Ingersoll, Interdisciplinary Scientist,
Polar Atmospheric Science, California Institute of Technology,
Pasadena, Calif.
The briefing will be carried live on NASA Select television
(Satcon F2R, transponder 13, 72 degrees west longitude) with remote Q.
and A. capability.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | You can't hide broccoli in
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | a glass of milk -
|_____|/ |_|/ |_____|/ | anonymous 7-year old.
|
| 528.23 | Updates - August 14-20 | VERGA::KLAES | Slaves to the Metal Hordes | Fri Aug 21 1992 22:11 | 366 |
| Article: 1715
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Update - 08/14/92
Date: 15 Aug 92 07:35:33 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 33 Days
Date of report: 8-14-92 Time of report: 7:00 PM EDT
One of TOS's (Transfer Orbit Stage) previously identified two
problems, has become a constraint on encapsulation. The first
issue involves the potential overtest of a thrust vector control
actuator. Tests at the manufacture are underway over the weekend.
This is not a constraint to encapsulation, because, if it is
necessary to change out the actuator, the operation can be
accomplished through the bottom of the encapsulated assemblage.
The second issue, which is a constraint on encapsulation, involves
a short which occurred last Tuesday between a power terminal being
coated with insulation and the case of TOS's motor driven switch
assembly. There is no current explanation for the amount of energy
that was observed in this incident. An investigation is underway
which involves a data interface between the TOS and the spacecraft,
the integrated grounding environment and the connection of external
support equipment. With the resolution of this issue uncertain, the
actual encapsulation has been delayed from Saturday to Sunday. Since
Sunday was planned as a no work day, it is still expected that
encapsulation can be completed and transport to the launch complex
accomplished on schedule on Monday night/Tuesday morning.
We are having some difficulty in getting the remote located
equipment installed and checkout out at the launch complex due to
missing cables, incomplete communications circuits and lightning
caused clears of the work area. The current plan calls for
increased support from the Cape elements and work through the
weekend to assure proper operation. The equipment will be
transported to the launch complex Sunday morning after spacecraft
batteries are charged. Proper operation of this equipment and its
interface with the spacecraft checkout station in building AO is,
however, a constraint on transporting the encapsulated spacecraft
to the launch complex.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | You can't hide broccoli in
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | a glass of milk -
|_____|/ |_|/ |_____|/ | anonymous 7-year old.
Article: 1724
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Update - 08/15/92
Date: 18 Aug 92 00:02:51 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 32 Days
Date of report: 8-15-92 Time of report: 6:00 PM EDT
TOS (Transfer Orbit Stage) continues to investigate their short
circuit problem. The situation that allowed the short to occur
seems to be an inadvertent connection (as yet unlocated) between
their signal ground (which should float) and their structure. All
interfaces to the spacecraft were examined to see if the spacecraft
was the cause (because the spacecraft signal ground and structure
ground are connected together). No design problems were found.
According to the drawings, all interface circuits are properly
terminated. TOS is investigating a possible path through their
safe and arm switch. Because the cause is uncertain, and TOS has
not powered on since the short, they want to run a system test to
verify proper operation. They have asked for time, prior to
encapsulation, through Monday evening (with a goal of Sunday evening)
to verify their condition.
The thrust vector control actuator overtest issue is still being
worked by the vendor, CSD, and the results are expected Sunday evening.
Saturday morning, Titan announced that their payload fairing crew
would exceed the 60 hour workweek limit if they didn't take Sunday
off. We asked that they apply for a waiver from the Air Force to
allow them to do the encapsulation on Sunday if TOS was ready. The
Air Force denied the waiver.
So....we will not encapsulate on Sunday. GE will top off the
batteries Sunday night, and the RLE (Remote Launch Equipment) will be
moved to the pad on Monday morning. The earliest we could encapsulate
is then Monday morning.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Optimists live longer
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | than pessimists.
|_____|/ |_|/ |_____|/ |
Article: 1725
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 08/16/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Tue, 18 Aug 1992 00:04:52 GMT
Forawrded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 30 Days
Date of report: 8-17-92 Time of report: 9:00 AM EDT
TOS (Transfer Orbit Stage0 continued their troubleshooting activities
concerning their short circuit problem. They identified a set of
back-to-back zener diodes in their laser inertial navigation system
box (LINS) that could have been shorted when the inadvertent short
circuit from the battery bus to structure occurred last Tuesday.
Unfortunately, a test yesterday to eliminate that element by
disconnecting its power connector did not remove the problem.
TOS is bring their complete management and technical teams to the
Cape today to put added horsepower on solution of the problem.
The other TOS issue, that of the potential overstress of one of
their thrust vector actuators during test at the vendor, has
generally been dismissed as a problem. Testing over the weekend
indicated that the temperature rise of the added test time was not
enough to cause reflow of the solder on the brushes.
The earliest that we could now encapsulate is Wednesday, assuming
TOS resolves their problem today. There is now concern about
making the Launch Day Dress Rehearsal on August 27-29. Several
other constraints imposed by other commitments of the Range impact
this situation.
The RLE (Remote Launch Equipment) went to the launch complex this
morning for final checkout. It will be returned to the PHSF
(Payload Hazardous Support Facility) for spacecraft battery charging
the afternoon before encapsulation.
We plan to replace the PMIRR (Pressure Modulator Infrared Radiometer)
soft cover and to reinitiate the GRS (Gamma Ray Spectrometer) purge today.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Optimists live longer
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | than pessimists.
|_____|/ |_|/ |_____|/ |
Article: 1734
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Update - 08/17/92
Date: 18 Aug 92 08:43:19 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 30 Days
Date of report: 8-17-92 Time of report: 8:00 PM EDT
TOS (Transfer Orbit Stage) made essentially no progress on their
short circuit problem today. Since disconnecting the LINS (Laser
Inertial Navigation System) didn't clear the problem, they are
now looking for other high potential candidates. The spacecraft
seems to be next on their list, although GE's analysis shows no
design situation that could connect their grounds together. TOS
has developed a test to disconnect the box that interfaces with
the spacecraft, thus removing the spacecraft as possible contributor,
and then look for the short. A simple TOS predeployment checkout
test would reverify the demated interface. We are generally opposed
to opening any connector that requires us to redo the TOS interface
test because of the additional time that would add to the schedule.
If TOS does their proposed test, it would probably be done on Tuesday.
The RLE (Remote Launch Equipment) went to the pad this morning, was
cabled up, and isolation testing was performed. At about 6 PM lightning
closed the pad. When work was stopped, control had not yet been
established from AO. This work is now behind schedule and there is
uncertainty related to why the control signals are not be transferred
correctly. We think the Cape data circuits are working correctly.
Titan has told us that if we do not encapsulate on Wednesday, and
hardmate to the vehicle on Friday, we will have to slip the Launch
Date Dress Rehearsal scheduled to start on August 27. The Range
has significant constraints on slipping this date due to their
commitments to other projects.
Thus, TOS is working to a goal of being finished with their trouble
shooting and starting functional verification tests by 6 PM Tuesday
so that they will be ready to encapsulate at 6 AM on Wednesday.
We did not reinstall the PMIRR (Pressure Modulator Infrared Radiometer)
soft cover because further discussion revealed concern that the risk
of inflicting damage to the PMIRR thermal blankets was greater than the
risk of any significant contamination.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Optimists live longer
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | than pessimists.
|_____|/ |_|/ |_____|/ |
Article: 1738
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 08/18/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Wed, 19 Aug 1992 07:35:12 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 29 Days
Date of report: 8-18-92 Time of report: 6:00 PM EDT
....And for another day, TOS (Transfer Orbit Stage) continues
their trouble shooting, looking for an elusive fault between their
signal return and chassis that shows the characteristics of a diode.
During their activities last night they disconnected the spacecraft
from the TOS at the connectors at the bolted joint on the payload
adapter (without our permission). Fortunately this verified that the
spacecraft was not the cause of their problem, but did create a
significant issues test control and reverification of the circuits
(see below). During the day today, TOS has been trying to get
started on a functional test of their system to verify that, even
though they cannot find the location of the anomaly, the system
still performs properly. Late in the afternoon, another set of
zener diodes between the signal ground and the structure (such as
was identified in the LINS (Laser Inertial Navigation System)), in
their S-band transmitter, was located, and now is considered to be
the cause. Testing is underway at this writing to confirm this
hypothesis. A changeout of the S-band transmitter is being considered.
Encapsulation is now scheduled for tomorrow morning, assuming TOS
finds their problem, verifies their performance, and gets their
management approval before 8 AM. Encapsulation tomorrow will
maintain the Launch Day Dress Rehearsal (LDDR) on schedule for
August 27-29. Any further delay in encapsulation impacts the LDDR,
and makes the first day of the launch period problematic.
Because the TOS-to-spacecraft interface was opened, the question of
reverification of these circuits has been assessed. TOS wanted to
run another mission interface test with the spacecraft which the
spacecraft cannot support because the RLE (Remote Launch Equipment)
is at the launch pad. We wanted to run the mission test on the
launch pad rather than risk breaking the RLE configuration, but
TOS could not support the high risk of doing this test on the pad.
Therefore, we reached a position with acceptable risk which involves
having TOS run their mission test without the spacecraft, the spacecraft
checks all but TOS discrete signals with its GO/NO-GO test on the pad,
and the TOS discretes will not be specifically verified. This position
is based on the fact that the signals are redundant, they are split
between two connector which will have all other circuit verified,
and used in a voting circuit which requires that two out of four
signals be present.
The RLE is at the pad being checked out. After the usual daily
problems with the communications circuits, half of the functions
have been verified at this writing. The special JPL verification
test of the command and clock waveforms has confirmed good
waveforms on half the critical circuits. The rest will be
completed tomorrow morning. The RLE will be returned to the PHSF
(Payload Hazardous Support Facility) for battery charging only if
encapsulation slips to Thursday or later.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Optimists live longer
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | than pessimists.
|_____|/ |_|/ |_____|/ |
Article: 1751
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 08/20/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Fri, 21 Aug 1992 06:48:32 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 27 Days
Date of report: 8-20-92 Time of report: 6:00 PM EDT
[Note: There was no report on 8-19-92]
TOS (Transfer Orbit Stage) found their ground fault in their S-band
transmitter, and replaced the unit with a spare last Tuesday evening.
On Wednesday TOS conducted a system functional test and pronounced
the vehicle ready to fly.
The two electrical connectors between the spacecraft and TOS that
were opened during TOS trouble shooting were remated yesterday
evening. Verification of all but one circuit in each connector
will be accomplished by the completion of the Launch Day Dress
Rehearsal.
A re-pre-encapsulation review was held yesterday afternoon. The
result was a decision to go forward with encapsulation. Titan was
able to reschedule their payload fairing crews and began the
encapsulation process at 6 pm in the evening. The MOLA (Mars
Observer Laser Altimeter), MOC (Mars Observer Camera) and
TES (Thermal Emission Spectrometer) covers were removed. The
two halves of the payload fairing were closed about midnight.
The pre-mate review was held this morning. There are no hard
constraints to mating with Titan. A lien involves the RLE
(Remote Launch Equipment) readiness. There is still a noisy
waveform on one of the command clock circuits, and late this
afternoon the problem was isolated to bad cable in the launch
complex AGE building which will be replaced.
Transporting the encapsulated Mars Observer spacecraft and TOS is
scheduled between 10 pm and 2 am tonight weather permitting. (The
weather doesn't look good at this time.)
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Optimists live longer
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | than pessimists.
|_____|/ |_|/ |_____|/ |
|
| 528.24 | Mars Observer moved to Launch Complex 40 and mated to Titan III | PRAGMA::GRIFFIN | Dave Griffin | Mon Aug 24 1992 20:10 | 38 |
| George Diller August 21, 1992
Kennedy Space Center
Bob MacMillin
Jet Propulsion Laboratory
KSC Release No. 111-92
The Mars Observer spacecraft passed another milestone toward launch when
it was moved from the Payload Hazardous Servicing Facility on Kennedy Space
Center to Launch Complex 40 on Cape Canaveral Air Force Station and mated to
the Martin Marietta Titan III rocket. With the payload atop the launch
vehicle, checks of the Mars Observer spacecraft and the attached Transfer Orbit
Stage (TOS) will begin this weekend.
Two major exercises to prepare for launch are on tap for next week. An
Operational Readiness Test on Aug. 26 will test all facilities that send and
receive data during flight activities. These include NASA, JPL, and Air Force
tracking and data systems around the world.
A countdown dress rehearsal on Aug. 28 will simulate launch day activities
and all countdown events as closely as possible. The mobile service tower will
be retracted from around the launch vehicle, and the full NASA, Martin Marietta
and Orbital Sciences launch team will participate in this exercise.
All activities currently are on schedule to support a launch at the
opening of the Mars planetary opportunity on September 16. The launch window
extends from 1:02 to 3:05 p.m. EDT.
Mars Observer will be the first U.S. mission to Mars since the Viking
program in 1975. From a circular Martian polar orbit of 250 miles, it will
create a detailed global portrait of the planet. The spacecraft will map the
surface and study Mars geology while profiling its atmosphere and weather. The
mission is designed to span one Martian year, or 687 earth days.
|
| 528.25 | | DECWIN::FISHER | I *hate* questionnaires--Worf | Mon Aug 31 1992 16:14 | 10 |
| I saw a report in the paper over the weekend that the MO launch will be delayed
indirectly because of Hurricane Andrew. What I understood from the article was
that they decided to pressurize the spacecraft housing (I assume the payload
canopy) with nitrogen to prevent any contaminants from entering during any
possible high winds. However, the nitrogen was contaminated, so they need to
clean the spacecraft (demate etc? I assume so.) In any case, they were not sure
how long the delay would be, but the felt it would still be within the launch
window.
Burns
|
| 528.26 | Mars Observer launch to be rescheduled | PRAGMA::GRIFFIN | Dave Griffin | Mon Aug 31 1992 18:41 | 31 |
| Donald L. Savage
Headquarters, Washington, D.C. August 28, 1992
George Diller
Kennedy Space Center, Fla.
Frank O'Donnell
Jet Propulsion Laboratory, Pasadena, Calif.
LAUNCH ADVISORY
The launch of Mars Observer aboard a Titan III rocket from Cape Canaveral
Air Force Station, Fla., originally scheduled for Sept. 16, is being postponed.
During an inspection of the payload contained within the Titan nose
fairing atop the rocket, particulate contamination was observed on the surface
of the Mars Observer spacecraft. A precautionary decision has been made to
remove the payload from the Titan and return it to a spacecraft facility on
Kennedy Space Center for cleaning.
The contamination may have been introduced into the fairing when a dry
nitrogen purge was placed on the spacecraft as part of securing for Hurricane
Andrew.
The countdown dress rehearshal scheduled for today will also be postponed
at this time. A new launch date cannot be determined until it is known how
long it will take to clean the spacecraft. However, a launch before the end of
September is expected. The planetary launch window extends through Oct. 13.
|
| 528.27 | Updates - August 21-28 | VERGA::KLAES | All the Universe, or nothing! | Tue Sep 01 1992 19:38 | 411 |
| Article: 1762
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 08/21/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Sat, 22 Aug 1992 06:40:20 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 26 Days
Date of report: 8-21-92 Time of report: 4:00 PM EDT
The encapsulated Mars Observer spacecraft and the Transfer Orbit
Stage (the stack) were transported to LC-40 (Launch Complex 40)
starting at 2:30 AM this morning after a weather delay, and a delay
to assure that the doors to the Universal Environmental Shelter on
LC-40 were open. Arrival at the pad was at 4:40 AM.
After the stack arrived at the pad, a crane operability problem was
encountered. The lift was begun at 9:35 AM and the stack was hard
down on the Titan at 11:00 AM. Fortunately, due to a cloud cover,
the stack was not exposed to direct sunlight for more than about an
hour. The thermograph carried inside the payload fairing has not
been read yet, but it is expected that the stack didn't exceed its
temperature limits.
Battery charging will begin as soon as there is access to Level 11
in the tower. In addition, trouble shooting will continue at that
time on a cable between the Tower Telemetry and Command Amplifier
(TTCA) and the Titan where the problem with a noisy clock signal
for spacecraft memory loading is suspected.
Following battery charging, we will confirm umbilical mode
operation and perform a GO/NO-GO SEPET to reestablish spacecraft
readiness this weekend.
We have confirmed August 28 as the simulated launch day for the
Launch Date Dress Rehearsal. The option of trading this date with
a Delta launch on August 31/September 1 was considered undesirable
because, given the spacecraft and launch vehicle events that must
occur after the LDDR, it would cause a slip past the opening of the
launch period.
We are watching the approach of Tropical Storm Andrew which is now
expected to become a hurricane in the next 12 hours. If it
maintains its present course and speed, it may affect us no earlier
than next Tuesday evening or Wednesday.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Optimists live longer
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | than pessimists.
|_____|/ |_|/ |_____|/ |
Article: 25815
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space,sci.astro,sci.geo.meteorology
Subject: Mars Observer Update - 08/23/92
Date: 24 Aug 92 12:53:26 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 24 Days
Date of report: 8-23-92 Time of report: 1:30 PM EDT
With the impending arrival of Hurricane Andrew, a number of
specific actions have been taken:
o The spacecraft batteries have been fully charged.
o The RLE (Remote Launch Equipment), and the TOS (Transfer
Orbit Stage) support equipment have been moved out of
the B-10 room in the AGE building to avoid water damage.
o The Titan is being secured.
o Payload fairing air conditioning has been removed and the
nitrogen purge re-established.
o The science instrument purge system is connected and
extra gas bottles have been put into place as a backup to
the pad facility supply.
o The spacecraft checkout station computers memories have
been backed up, and j-boxes and cables lifted above the
floor. The racks have been covered with plastic.
o The science instrument support equipment has been covered
with plastic.
o Spare flight hardware has been relocated to the second
floor of building AO.
o Storm shutters are up on building AO and the entrances
are being sandbagged.
o Evacuation plans have been established, but not executed
at this time, for all JPL and GE personnel.
The Cape is in "Hurricane Condition III" since 8 pm Saturday evening,
which means winds of greater than 50 knots (58 mph) are expected
within 48 hours. At this writing, we are awaiting word from the Air
Force weather officer regarding the continuance of this condition.
An evacuation of the Cape will not be ordered until "Hurricane
Condition II" is called when winds greater than 50 knots are expected
within 24 hours.
The actions taken thus far will probably cause a slip of the Launch
Day Dress Rehearsal, and a slip in the readiness for launch. The
actual schedules cannot be accurately assessed until the hurricane
conditions have terminated, and the recovery plans established.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Optimists live longer
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | than pessimists.
|_____|/ |_|/ |_____|/ |
Article: 1784
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 08/24/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Mon, 24 Aug 1992 23:28:34 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 23 Days
Date of report: 8-24-92 Time of report: 9:00 AM EDT
At this time we are out of the "Hurricane Condition III" (the Air
Force has issued an "all clear" from hurricane support), and all
elements are proceeding to re-establish their functional
configurations that were in place on Friday night before the
hurricane interrupted the flow. As the result of our preparedness
and the low severity of the storm here, we believe, at this time,
that we sustained no physical damage from the storm.
The first priorities for the spacecraft are to re-install the RLE
(Remote Launch Equipment) in the B-10 room of the AGE building, and
to work with Titan to clear the TTCA to Titan cabling problem
(which is in series with all our future operations).
The science purge flow is being check at this time, the payload
nitrogen purge has been terminated and the air conditioning will be
will be re-established by 12:30 AM. We expect to gain access to
the Universal Environmental Shelter at level 11 at about 11:30 AM
after the residual nitrogen has escaped.
Other spacecraft operations required before the Launch Day Dress
Rehearsal (LDDR) include battery charging, umbilical mode check,
GO/NO-GO SEPET, loading flight software version 6E, and a practice
countdown. This totals about 4 days from the time that the TTCA to
Titan cabling problem is solved.
Several scheduling meetings with all elements this morning and in
the early afternoon will address how much time is required to be
ready for the LDDR. It appears that the LDDR will have to slip.
We will have more data for the next report.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Optimists live longer
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | than pessimists.
|_____|/ |_|/ |_____|/ |
Article: 1782
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 08/25/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Wed, 26 Aug 1992 07:04:06 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 22 Days
Date of report: 8-25-92 Time of report: 6:00 PM EDT
The RLE (Remote Launch Equipment) has been reinstalled, and work is
proceeding implementing the solution to the pad cabling problem which
has plagued us for the past several days. It was found that there
were 18 extraneous circuits attached to our Titan interface circuits
that were left over from wiring installed for previous users of the
umbilical mast. This extra wiring loaded down the line drivers such
that an unacceptable waveform resulted. These circuits are being
removed. It is expected that we will finally be able to mate the
spacecraft connectors momentarily.
If all goes well, and the umbilical mode checkout can be
accomplished by 8 PM tonight, a start will be made on the GO/NO-GO
SEPET which will verify the electrical performance of the
spacecraft after transporting from the PHSF (Payload Hazardous
Support Facility) and mating to the Titan. The spacecraft has not
been powered-on since we committed to the encapsulation process on
August 11.
In the process of assessing the impact to the Launch Day Dress
Rehearsal (LDDR) as the result of the hurricane and the delays in
encapsulation, we found that if we missed the scheduled date (8/27-
29), the only alternative dates for rescheduling that are available
in the Range schedule are so far downstream that they would cause
a launch slip. The spacecraft readiness for the LDDR has become
the pacing item. In order not to impact the LDDR schedule, and
thus the launch date, we have made several decisions relative to
which spacecraft activities will be completed before the LDDR, so
as not to slip its date. The loading of flight software version 6E
will be deferred. We have compressed the time for the umbilical
mode test and the GO/NO-GO SEPET. The countdown practice run maybe
become expendable. Post LDDR time requirements have been reduced
by a reassessment of the time required for battery reconditioning.
Thus, we are planning, if everything goes correctly, the be ready
to support the LDDR on schedule.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Optimists live longer
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | than pessimists.
|_____|/ |_|/ |_____|/ |
Article: 1797
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 08/27/92 (Launch has been postponed)
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Fri, 28 Aug 1992 07:45:50 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 20 Days
Date of report: 8-27-92 Time of report: 6:00 pm EDT
[There was no report on 8-26-92]
Two evenings ago, on Tuesday, August 25th, a significant amount of
debris was observed on the nadir panel surfaces of the spacecraft
through the access port in the side of the payload fairing near the
MOLA (Mars Observer Laser Altimeter). Subsequent investigation also
found debris on the TOS (Transfer Orbit Stage). A series of
investigative teams have been established to: 1) identify the constituents,
size and distribution of the debris, 2) identify and correct the source
of the debris, 3) assess the mission impacts, and 4) define the cleaning
plans. These activities involve all members of the project community
from the science instrument people, spacecraft, TOS and to Titan, and
including our KSC support partners.
Investigation of these items is far from complete. The exact
source of the contaminating debris has not been firmly established.
The contamination may have been introduced into the fairing when a
dry nitrogen purge was placed on the spacecraft as part of the
securing the payload fairing air conditioning for Hurricane Andrew
last Sunday morning.
In addition to this anomaly, TOS had difficulty turning themselves
off during a readiness test last night. Trouble shooting is
underway on that issue at this time. The spacecraft is implicated
in this problem.
As a result of these two problems, the Launch Day Dress Rehearsal,
scheduled for Friday, was canceled.
Based on the evidence of the severity of the debris contamination
problem, a decision was made to removed the encapsulated spacecraft
from the Titan and return it to the PHSF (Payload Hazardous Support
Facility) immediately. The current plan, somewhat contingent on the
conclusion of TOS's trouble shooting, is the transport back to the
PHSF on Friday night. Access to the spacecraft would them be available
Sunday morning.
The amount of time required to clean the spacecraft and the TOS is
unknown. The launch has been postponed, and no new launch
readiness date has been established.
A decision relative to holding or postponing the Spacecraft Launch
Readiness Review will be announced tomorrow, Friday.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Optimists live longer
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | than pessimists.
|_____|/ |_|/ |_____|/ |
Article: 1800
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Launch to be Rescheduled
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Fri, 28 Aug 1992 23:32:52 GMT
Donald L. Savage
Headquarters, Washington, D.C. August 28, 1992
(Phone: 202/453-8400)
George Diller
Kennedy Space Center, Fla.
(Phone: 407/867-2468)
Frank O'Donnell
Jet Propulsion Laboratory, Pasadena, Calif.
(Phone: 818/354-5011)
LAUNCH ADVISORY
MARS OBSERVER LAUNCH TO BE RESCHEDULED
The launch of Mars Observer aboard a Titan III rocket from Cape
Canaveral Air Force Station, Fla., originally scheduled for Sept. 16,
is being postponed.
During an inspection of the payload contained within the Titan
nose fairing atop the rocket, particulate contamination was observed
on the surface of the Mars Observer spacecraft. A precautionary
decision has been made to remove the payload from the Titan and return
it to a spacecraft facility on Kennedy Space Center for cleaning.
The contamination may have been introduced into the fairing when
a dry nitrogen purge was placed on the spacecraft as part of securing
for Hurricane Andrew.
The countdown dress rehearshal scheduled for today will also be
postponed at this time. A new launch date cannot be determined until
it is known how long it will take to clean the spacecraft. However, a
launch before the end of September is expected. The planetary launch
window extends through Oct. 13.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Optimists live longer
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | than pessimists.
|_____|/ |_|/ |_____|/ |
Article: 1812
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Update - 08/28/92
Date: 29 Aug 92 04:55:28 GMT
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus -TBD- Days
Date of report: 8-28-92 Time of report: 4:00 PM EDT
The Spacecraft Launch Readiness Review has been postponed. A new
date will be announced within the next few days.
Activities have been underway since early this morning to remove
the encapsulated TOS (Transfer Orbit Stage) and Mars Observer
spacecraft from the Titan vehicle late tonight. They will be
transported to the PHSF (Payload Hazardous Support Facility),
de-encapsulated and available for cleaning toward the end of the
day on Sunday.
TOS found the cause of their failure to turn-off problem. The
spacecraft was not implicated.
While significant work has been undertaken to plan the spacecraft
cleaning process, the amount of time it will take is uncertain and
it is still to early to project new launch readiness date.
Intensive investigation continues into the identification of the
particulate contamination and its source.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Optimists live longer
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | than pessimists.
|_____|/ |_|/ |_____|/ |
|
| 528.28 | Mars Observer NASA Press Kit | VERGA::KLAES | All the Universe, or nothing! | Fri Sep 04 1992 20:19 | 1339 |
| From: DECWRL::"baalke@kelvin.jpl.nasa.gov" "MAIL-11 Daemon" 3-SEP-1992
19:27:42.10
To: usenet-space-news@arc.nasa.gov
CC:
Subj: Mars Observer Press Kit
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
MARS OBSERVER
PRESS KIT
SEPTEMBER 1992
PUBLIC AFFAIRS CONTACTS
NASA HEADQUARTERS, WASHINGTON, D.C.
Office of Space Science and Applications
Paula Cleggett-Haleim
(Phone: 202/358-1547)
Donald L. Savage
(Phone: 202/453-8400)
Office of Communications
Dwayne C. Brown
(Phone: 202/358-0547)
JET PROPULSION LABORATORY, PASADENA, CALIF.
Robert J. MacMillan
Diane Ainsworth
(Phone: 818/345-5011)
KENNEDY SPACE CENTER, FLA.
Dick Young
Karl Kristofferson
George H. Diller
(Phone: 407/867-2468)
MARSHALL SPACE FLIGHT CENTER, HUNTSVILLE, ALA.
Dom Amatore
Jerry Berg
(Phone: 205/544-0034)
LEWIS RESEARCH CENTER, CLEVELAND
Marilyn S. Edwards
Mary Ann Peto
(Phone: 216/433-2819)
CONTENTS
General Release 1
Mars Observer Science Objectives 6
Mission Design 7
Spacecraft Science Instruments 9
Mission Timeline 16
Mapping Cycle 17
The Spacecraft System 18
Spacecraft Description 19
Titan III Launch Vehicle 20
Titan III Facts 21
Transfer Orbit Stage 23
Launch Vehicle and Payload Processing 27
Launch Countdown and Flight Control 28
Countdown Milestone Events 29
Mars Observer/Titan III/TOS Tracking Support 30
Salient Facts on Speed and Distance 31
Science Operations 32
Mars Observer Investigators 33
Interdisciplinary Scientists 36
Mars Observer Management 37
Previous Mars Missions 39
RELEASE: 92-142
MARS OBSERVER READY TO TAKE THE NEXT STEP IN MARS EXPLORATION
NASA will continue the exploration of Mars -- started by
the Mariner IV spacecraft 28 years ago -- when Mars Observer
is launched in September. The last U.S. spacecraft to visit
Mars was Viking 2 in 1976.
"Mars Observer will examine Mars much like Earth
satellites now map our weather and resources," said Dr.
Wesley Huntress, Director of NASA's Solar System Exploration
Division, Washington, D.C. "It will give us a vast amount of
geological and atmospheric information covering a full
Martian year. At last we will know what Mars is actually
like in all seasons, from the ground up, pole to pole.
"In the mid 1960s, the Mariner flybys resulted in the
historic first pictures of the cratered surface of Mars,"
Huntress continued. "Then, the Viking landers looked for
signs of life at two landing sites. The Viking orbiters also
made global maps which gave us a good picture primarily of
surface features. Now, the Mars Observer mission marks the
next phase in planetary exploration."
"Mars Observer will tell us far more about Mars than
we've learned from all previous missions to date," said David
Evans, Project Manager, NASA's Jet Propulsion Laboratory
(JPL), Pasadena, Calif. "We want to put together a global
portrait of Mars as it exists today and, with that
information, we can begin to understand the history of Mars.
"By studying the evolution of Mars, as well as Venus',
we hope to develop a better understanding as to what is now
happening to planet Earth," Evans said. "As we look even
further into the future, this survey will be used to guide
future expeditions to Mars. The first humans to set foot on
that planet will certainly use Mars Observer maps and rely on
its geologic and climatic data," Evans said.
Launch and Cruise to Mars
Mars Observer is scheduled for launch aboard a Titan III
rocket in late September from Cape Canaveral Air Force
Station, Fla. The beginning of the launch opportunity is
Sept. 16, 1992. The launch window opens at 1:02 p.m. EDT and
closes at 3:05 p.m. EDT. The daily launch window will vary
slightly on subsequent days. The 28-day launch opportunity
extends through Oct. 13, 1992.
Mars Observer will be lofted into Earth orbit aboard a
Titan III launch vehicle. After separation from the Titan,
an upper stage vehicle -- the Transfer Orbit Stage (TOS) --
will fire to free the spacecraft from Earth's gravity and
send it on to Mars.
"During its 11-month transit from Earth to Mars, known
as the cruise phase, Mars Observer will deploy four of its
six solar panels to begin drawing solar power," said George
Pace, Spacecraft Manager at JPL.
"The dish-shaped, high-gain antenna will be deployed
and the Magnetometer and Electron Reflectometer (MAG/ER) and
the Gamma Ray Spectrometer (GRS) will be partially deployed,"
Pace said. "Four trajectory correction maneuvers are planned
during the cruise phase to guide the spacecraft to its
destination."
On Aug. 19, 1993, Mars Observer will arrive in the
vicinity of Mars. As it approaches the planet, the
spacecraft will fire onboard rocket engines to slow its speed
and allow the gravity of Mars to capture it in orbit around
the planet.
Mars Observer will first enter a highly elliptical
orbit. Then, over a period of 4 months, onboard rocket
thrusters will gradually move the spacecraft into a nearly
circular orbit inclined 93 degrees to the planet's equator at
204 nautical miles (378 kilometers) above the Martian
surface. In this orbit, the spacecraft will fly near the
Martian poles.
Global Mapping Mission and Science Operations
Mars Observer will provide scientists with an orbital
platform from which the entire Martian surface and atmosphere
will be examined and mapped. The measurements will be
collected daily from the low-altitude polar orbit, over the
course of 1 complete Martian year -- the equivalent of 687
Earth days.
"The scientific payload consists of seven science
instruments to examine Mars from the ionosphere -- an
envelope of charged particles that surrounds Mars -- through
the atmosphere and to the surface," said Dr. Arden Albee,
Project Scientist at the California Institute of Technology.
"The science instruments will provide teams of
experimenters with daily global maps of the planet," Albee
said. "Mars Observer's camera (MC) will resolve objects far
smaller than was previously possible -- down to about 33 feet
(10 meters) in diameter."
Scientists will control their spaceborne experiments
from their home institutions through a computer network
linking them to the Mars Observer operations center at JPL.
They can access data from their experiments daily using
special workstations and electronic communications links and
distribute results to other mission science teams.
International Participation
Near the end of its prime mission in the fall of 1995,
Mars Observer may be joined by the Russian "Mars '94"
spacecraft. Current plans call for the Russian spacecraft to
deploy penetrators as well as small surface stations. Mars
Observer's Mars Balloon Relay (MBR) radio-receiver equipment,
supplied by the Centre National d'Etudes Spatiales (CNES) in
France, is designed to relay data from the penetrators and
surface stations to Earth.
The Mars Observer mission also includes scientists from
three countries besides the United States on its seven
investigation teams, both as team members and as co-
investigators. In addition, four foreign participating
scientists will join the teams in October 1992.
Also in October, 11 participating scientists from Russia
will be added to the teams as part of the continuing formal
U.S. - Russian cooperation in planetary exploration.
Program and Mission Management
The Mars Observer spacecraft was built under contract to
NASA and JPL by the Astro-Space Division of General Electric,
Princeton, N.J.
NASA's Lewis Research Center in Cleveland, Ohio, managed
the commercial launch services contract with Martin Marietta
Commercial Titan, Inc., Denver, which supplied the Titan III
launch vehicle.
The Transfer Orbit Stage (TOS) was built by Martin
Marietta under contract to Orbital Sciences Corp., Vienna,
Va. The TOS project was managed by NASA's Marshall Space
Flight Center, Huntsville, Ala.
Launch Complex 40 at the Cape Canaveral Air Force
Station was completely refurbished for the launch by Martin
Marietta and the Bechtel Corporation under contract to the
U.S. Air Force.
NASA's Deep Space Network (DSN) will support the launch,
mission operations and tracking of the spacecraft throughout
its primary mission. Tracking and data retrieval through the
DSN are managed by JPL for NASA's Office of Space
Communications, Washington, D.C.
The Mars Observer Project Manager is David D. Evans of
JPL. Dr. Arden Albee of the California Institute of
Technology is the Project Scientist. Dr. William L.
Piotrowski of NASA Headquarters is the Mars Observer Program
Manager and Dr. Bevan French is the Program Scientist.
JPL manages the mission for the Solar System Exploration
Division of NASA's Office of Space Science and Applications
at NASA Headquarters, Washington, D.C.
- end of general release -
Mission Outline graphic
Mapping Phase timeline graphic
MARS OBSERVER SCIENCE OBJECTIVES
The Mars Observer mission will study the geology,
geophysics and climate of Mars. The primary objectives are to:
% identify and map surface elements and minerals;
% measure the surface topography and features;
% define globally the gravitational field;
% determine the nature of the magnetic field;
% determine the distribution, abundance, sources and
destinations of volatile material (carbon dioxide, water) and
dust over a seasonal cycle; and
% explore the structure and aspects of the circulation
of the atmosphere.
The mission will provide scientists with a global
portrait of Mars as it exists today using instruments similar
to those now used to study the Earth. The seven instruments
have been selected so that observations from one provide a
complimentary approach to the mission objectives. For
example, the composition of surface minerals will be
addressed by both the Gamma Ray Spectrometer (chemical
composition) and the Thermal Emission Spectrometer (mineral
composition).
The interdisciplinary investigations of the Mars
Observer mission also will combine data from more than one
instrument to explore questions that cross boundaries between
scientific disciplines and individual investigations. The
six interdisciplinary investigations are:
% atmospheres/climatology;
% data management/archiving and surface weathering processes;
% geosciences;
% polar atmospheric sciences;
% surface-atmosphere interactions; and
% surface properties and morphology.
The mission will provide a major increase in available
scientific data about Mars. During its 687-day mapping
mission, Mars Observer will return about 120 megabytes of
data per day, for a total of about 80 - 90 gigabytes (about
600 billion bits of information). This amounts to more
scientific information than has been returned by all previous
planetary missions, whether to Mars or elsewhere, not
including the current Magellan mission.
Mission Design
Following launch and insertion into a trans-Martian
trajectory by TOS, the spacecraft will perform four
trajectory correction maneuvers (TCM) to correct and adjust
the trajectory. TCM-1, scheduled for L+15 days (Oct. 1,
1992), will correct any errors from injection. Following
TCM-2, both the GRS and the MAG/ER will be activated to
collect data on the space environment. On Jan. 20, 1993, the
MOC will be powered on to take two narrow angle images as a
check-out.
The Mars orbit insertion phase is the transition from
the interplanetary cruise phase to the mapping orbit. Since
direct transition into the mapping orbit would require
undesirable out-of-plane maneuvers, a series of seven orbit
insertion maneuvers will be performed to bring the spacecraft
into the proper orbit for mapping. During these maneuvers
there will be limited scientific activity.
The polar orbit chosen for the Mars Observer mission is
low enough to allow close-range study of Mars, but high
enough so that the atmosphere does not drag excessively on
the spacecraft. The orbit also is sun-synchronous, meaning
that the spacecraft will pass over Mars' equator at the same
local time during each orbit -- about 2 p.m. on the day side
and about 2 a.m. on the night side. This orbit is essential
for a number of measurements, as it helps distinguish daily
atmospheric variations from seasonal variations.
During the mission's mapping cycle, which begins in
earnest on Jan. 13, 1994, data reception from the spacecraft
and command updates to the spacecraft and individual science
instruments will be conducted on a daily basis.
Once the primary task is completed, the Mars Observer
mission may be extended -- if the spacecraft and instruments
are still in good condition and if there is enough fuel to
control the spacecraft's altitude and orientation.
Spacecraft Instrument graphic
SPACECRAFT SCIENCE INSTRUMENTS
Collectively, Mars Observer's seven scientific
instruments will cover much of the electromagnetic spectrum
and form a complementary array. Each instrument produces
sets of data that contribute to a wide variety of scientific
investigations.
Gamma Ray Spectrometer (GRS)
The Gamma Ray Spectrometer will characterize the
chemical elements present on and near the surface of Mars
with a surface resolution of a few hundred kilometers. The
data will be obtained by measuring the intensities of gamma
rays that emerge from the Martian surface. These high-energy
rays are created from the natural decay of radioactive
elements or can be produced by the interaction of cosmic rays
with the atmosphere and surface.
By observing the number and energy of these gamma rays,
it is possible to determine the chemical composition of the
surface, element by element. The GRS also can measure the
presence of any volatiles, such as water and carbon dioxide,
as "permafrost" in the surface materials and the varying
thickness of the polar caps.
Mars Observer Camera (MOC)
The Mars Observer Camera system will photograph the
Martian surface with the highest resolution ever accomplished
by an orbiting civilian spacecraft. Resolution is a measure
of the smallest object that can be seen in an image.
Low-resolution global images of Mars -- a daily
'weather map' -- also will be acquired each day using two
wide-angle cameras operated at 4.7-mile (7.5-kilometer)
resolution per picture element (pixel). These same cameras
will acquire moderate-resolution photographs at 787 feet (240
meters) per pixel.
A separate camera will acquire very-high-resolution
images at 4.6 feet (1.4 meters) per pixel for features of
special interest. Each of these camera systems uses a line
array of several thousand detectors and the motion of the
spacecraft to create the images.
The low-resolution camera system will capture global
views of the Martian atmosphere and surface so that
scientists may study the Martian weather and related surface
changes on a daily basis. Moderate-resolution images will
monitor changes in the surface and atmosphere over hours,
days, weeks, months and years. The high-resolution camera
system will be used selectively because of the high data
volume required for each image.
GRS graphic
Mars Observer Camera graphic
Thermal Emission Spectrometer (TES)
The Thermal Emission Spectrometer will measure infrared
thermal radiation emitted from the Martian atmosphere and
surface. The thermal properties of Martian surface materials
and their mineral content may be determined from these
measurements. When viewing the surface beneath the
spacecraft, the spectrometer has six fields of view, each
covering an area of 1.9 by 1.9 miles (3 by 3 kilometers).
The spectrometer, a Michelson interferometer, will
determine the composition of surface rocks and ice and map
their distribution on the Martian surface. Other
capabilities of the instrument will investigate the advance
and retreat of the polar ice caps, as well as the amount of
radiation absorbed, reflected and emitted by these caps. The
distribution of atmospheric dust and clouds also will be
examined over the 4 seasons of the Martian year.
Pressure Modulator Infrared Radiometer (PMIRR)
This radiometer will measure the vertical profile of the
tenuous Martian atmosphere by detecting infrared radiation
from the atmosphere itself. For the most part, the
instrument will measure infrared radiation from the limb, or
above the horizon, to provide high-resolution (3-mi./5-km.)
vertical profiles through the atmosphere.
The measurements will be used to derive atmospheric
pressure and determine temperature, water vapor and dust
profiles from near the surface to as high as 50 miles above
the surface. Using these measurements, global models of the
Martian atmosphere, including seasonal changes that affect
the polar caps, can be constructed and verified.
Mars Observer Laser Altimeter (MOLA)
The Mars Observer Laser Altimeter uses a very short
pulse of laser light to measure the distance from the
spacecraft to the surface with a precision of several meters.
These measurements of the topography of Mars will provide a
better understanding of the relationship among the Martian
gravity field, the surface topography and the forces
responsible for shaping the large-scale features of the
planet's crust.
Radio Science
The Radio Science investigation will use the
spacecraft's telecommunication system and the giant parabolic
(dish-shaped) antennas of NASA's Deep Space Network to probe
the Martian gravity field and atmosphere. These measurements
will help scientists determine the structure, pressure and
temperature of the Martian atmosphere.
Each time the spacecraft passes behind the planet or
reappears on the opposite side, its radio beam will pass
through the Martian atmosphere briefly on its way to Earth.
The way in which the radio waves are bent and slowed will
provide data
TES graphic
MOLA & PMIRR graphic
about the atmospheric structure at a much higher vertical
resolution than any other Mars Observer experiment.
During that part of the orbit when the spacecraft is in
view of Earth, precise measurements of the frequency of the
signal received at the ground tracking stations will be made
to determine the velocity change (using the Doppler effect)
of the spacecraft in its orbit around Mars. These Doppler
measurements, along with measurements of the distance from
the Earth to the spacecraft, will be used to navigate the
spacecraft and to study the planet's gravitational field.
Gravitational field models of Mars will be used along
with topographic measurements to study the Martian crust and
upper mantle. By the end of the mission, as a result of the
low altitude of the orbit and the uniform coverage of Mars
Observer, scientists will have obtained unprecedented global
knowledge of the Martian gravitational field.
Magnetometer and Electron Reflectometer (MAG/ER)
Mars is now the only planet in the solar system, aside from
Pluto, for which a planetary magnetic field has not yet been detected
[What about Venus? - LK]. In addition to searching for a Martian
planetary magnetic field, this instrument also will scan the surface
material for remnants of a magnetic field that may have existed in the
distant past. The magnetic field generated by the interaction of the
solar wind with the upper atmosphere of Mars also will be studied.
Mars Balloon Relay (MBR)
The spacecraft carries a radio system supplied by the
French Centre National d'Etudes Spatiales (CNES) to support
the Russian Mars 94 mission. The Mars 94 spacecraft consists
of an orbiter, to be launched in October 1994, which will
deploy penetrators and small stations designed to land and
operate on the Martian surface.
The landers and penetrators will carry instruments to
directly sample both the atmosphere and the surface. The
landers and penetrators will send data to the Mars 94
orbiter, or to Mars Observer as a back up, for subsequent
relay to Earth. Both the landers and penetrators are
designed to operate for several years.
The MBR equipment consists of a transmitter/receiver
that will periodically receive and relay scientific and
engineering data to Earth.
If it is still operating on an extended mission, Mars
Observer also may support the Russian Mars '96 mission, which
is planning to release a balloon into the Martian atmosphere
and possibly deploy landed stations or rover vehicles which
can move about on the surface under their own power, operated
either by remote control from Earth or autonomously under
computer control. Following a launch during the 1996 window,
the Mars '96 spacecraft would reach Mars in 1997.
Mars Observer activity timeline chart
MAPPING CYCLE
In its near-circular mapping orbit, the Mars Observer
spacecraft will rotate once per orbit to keep the instruments
pointed at the planet. This will allow all instruments to
view the planet continuously and uniformly during the entire
Martian year.
The spacecraft, instruments and mission were designed so
that sufficient resources, especially power and data rate,
are available to power all instruments as they collect data
simultaneously and continuously on both the day and night
sides of the planet. The camera system takes photos only on
the day side and will acquire additional images every 3 days
during real-time radio transmissions to the Deep Space Network.
The rotation and orientation of the spacecraft are
controlled by horizon sensors, a star sensor, gyroscopes and
reaction wheels, as is common on Earth-orbiting satellites.
The horizon sensors, adapted from a terrestrial design,
continuously locate the horizon, providing control signals to
the spacecraft. The star sensor will be used for attitude
control during the 11-month cruise and as a backup to the
horizon sensors during the mapping orbit.
Once during each 118-minute orbit, the spacecraft will
enter the shadow of Mars and rely on battery power for about
40 minutes. The battery is charged by the spacecraft's large
solar panel, which generates more than a kilowatt of power
when it is in the sunlight.
Control of the spacecraft and instruments is
accomplished through the use of onboard microprocessors and
solid-state memories. Scientific and engineering data are
stored on tape recorders for daily playback to Earth.
Additional data operations will allow information to be
returned in real-time from selected instruments whenever
Earth is in view.
The lifetime of the spacecraft will most likely be
determined by the supply of attitude-control fuel and the
condition of the batteries.
THE SPACECRAFT SYSTEM
The Mars Observer spacecraft uses, where possible,
existing Earth-orbiting satellite component designs. The
craft's main body is shaped like a box and is about 3.25 feet
(1.1 meters) high, 7.0 feet (2.2 meters) wide, and 5.0 feet
(1.6 meters) deep. Mars Observer was built by General
Electric's Astro-Space Division in Princeton, N.J.
With its fuel, the spacecraft and its science
instruments weigh about 5,672 pounds (2,573 kilograms). The
spacecraft has a 3-year design lifetime and is equipped with
one large solar array, consisting of six 6 x 7.2 x 0.3-foot
(183 x 219 x 9.1-centimeter) solar panels.
At launch, the spacecraft's main communication antenna,
instrument booms and solar array will be folded close to the
spacecraft. During the cruise phase these structures will be
partially extended. The two 20-foot (6-meter) instrument
booms carry two of Mars Observer's seven scientific
instruments, the Magnetometer and Electron Reflectometer and
the Gamma Ray Spectrometer.
After the Mars Observer spacecraft reaches its mapping
orbit at Mars, the solar array and instrument booms will be
fully unfolded. The main communication antenna -- a 4.75-
foot (1.45-meter) diameter parabolic antenna -- will be
raised on a 20-foot (6-meter) boom and rotated to have a
clear view of Earth. The spacecraft then will power its
instruments to begin conducting the mission experiments.
Spacecraft Statistics
GENERAL
Design Life 3 years
Mapping Orbit Mars polar, nearly circular
Altitude Above Mars 400 km (242 miles), nominal
Key Features Seven science instruments
(two mounted on 6-m booms)
Bi- and monopropulsion systems
Three-axis control system
(highly stabilized)
Semiautonomous operation
(stores up to 2000 commands)
Reliability Redundancy used to avoid
single-point failures
Payload Weight 156 kg (343 lb)
Total Weight 2573 kg (5672 lb)
Size (launch configuration):
Length 1.6 m (5.0 ft)
Width 2.2 m (7.0 ft)
Height 1.1 m (3.25 ft)
COMMUNICATIONS
Command Rate 12.5 commands/s (max)
Uplink Data Rate 500 bits/s (max)
Downlink Data Rate 85.3 kbits/s (max)
Antennas 1.45-m-diam. high-gain
parabolic articulating (on 6-m boom)
Three low-gain
Downlink RF Power 44 watts
Tape Recorders 1.38 x 109-bit capacity
PROPULSION
Bipropellant System Monomethyl hydrazine and
nitrogen tetroxide
Monopropellant System Hydrazine
Thrusters (24 total) (4) 490 N
(4) 22 N
(8) 4.5 N (orbit trim)
(8) 0.9 N (momentum unloading and steering)
Total Propellant Weight 1346 kg (2961 lb)
ATTITUDE AND ARTICULATION CONTROL
Pointing Accuracy Control: 10 mrad
Knowledge: 3 mrad
Pointing Stability 1 mrad (for 0.5 s)
3 mrad (for 12 s)
ELECTRICAL POWER
Solar Array 6 panels, each 183 ~ 219 cm
Array Output Power 1130 watts
Batteries 42-amp-hr NiCd (2)
Electronics Bus voltage regulation
Definitions:
mrad = milliradian (E 0.057!)
N = newton (E 0.225 lb force)
TITAN III LAUNCH VEHICLE
Launch Services Contract
The NASA Lewis Research Center, Cleveland, is
responsible for the management of the Titan III launch
services contract with Martin Marietta Corp., Denver, for the
launch of the Mars Observer.
Lewis is responsible for the management, technical
oversight and integration of the payload with the Titan
launch system which includes the analytical, physical,
environmental and operational integration activities.
Lewis, along with the Jet Propulsion Laboratory and the
Marshall Space Flight Center, is responsible for integrated
trajectory design, including development of an integrated
sequence of events from lift-off through planetary spacecraft
separation from the upper stage.
Launch Vehicle
The Titan III can place payloads in excess of 31,000
pounds into low-Earth orbit and up to 11,000 pounds into a
geosynchronous transfer orbit. The Titan III is a member of
the Titan launch vehicle series that has been in use by the
U.S. Air Force and NASA for more than 20 years, including use
in the Gemini program. The Titan III also was used for
NASA's Voyager missions as well as the two Viking missions,
the last U.S. spacecraft to Mars.
The core vehicle consists of two liquid-propellant
booster stages that are the central propulsion element. Twin
10.2-foot diameter solid-propellant rocket motors (SRMs) are
attached to the core vehicle and provide thrust during
initial lift-off and boost phase.
TITAN III FACTS
SOLID ROCKET MOTORS (2) Length: 90.4 feet (27.6 meters)
Diameter: 10.2 feet (3.1 meters)
Motor Thrust: 1.4 million pounds
(6,200 kiloNewtons) per motor
Weight: 552,000 pounds (250,387
kilograms) per motor
Propellants: UTP-30001B solid
Contractor: United Technologies
FIRST STAGE Length: 78.6 feet (24 meters)
Diameter: 10 feet (3 meters)
Engine Thrust: 548,000 pounds
(2,43 kiloNewtons)
Propellants: Aerozine 50, nitrogen
tetroxide
Contractor: Martin Marietta
SECOND STAGE Length: 32.7 feet (10 meters)
Diameter: 10 feet (3 meters)
Engine Thrust: 105,000 pounds (467
kiloNewtons)
Propellants: Aerozine 50,
nitrogen tetroxide
Contractor: Martin Marietta
PAYLOAD FAIRING Diameter: 13.1 feet (4 meters)
Overall Length: 34.2 feet (10.4
meters)
Contractor: Contraves AG
EXTENSION MODULE Single Payload Mission
Length: 4.4 feet (1.34 meters)
Diameter: 13.1 feet (4 meters)
Contractor: Dornier GmbH
LAUNCH SITE Launch Complex 40 and associated
processing
facilities at Cape Canaveral Air
Force Station, Fla.
COMMERCIAL TITAN United Technologies, Chemical Systems
CONTRACTOR TEAM Division (solid rocket motors)
Aerojet TechSystems Co. (liquid-
propellant engines)
General Motors' Delco Systems
Contraves AG (payload fairing)
Dornier GmbH (extension module)
Titan III CONFIGURATION
Transfer Orbit Stage
A new upper stage vehicle, known as the Transfer Orbit
Stage (TOS), will make its maiden flight during the Mars
Observer mission. Following launch aboard the Titan III
rocket, the TOS will propel the spacecraft on its 11-month
interplanetary journey to Mars.
TOS is a single-stage, solid-propellant upper stage
vehicle used to propel a spacecraft from low-Earth orbit
toward its ultimate destination. It is a versatile addition
to NASA's inventory of upper stage vehicles, designed to
retain reliability and reduce cost.
Under the terms of a 1983 agreement with Orbital
Sciences Corp., Fairfax, Va., NASA provided technical
assistance during the development of TOS. NASA's TOS Project
Office at the Marshall Space Flight Center, Huntsville, Ala.,
ensured vehicle performance, reliability and compliance with
launch vehicle and spacecraft integration and flight-safety
requirements.
TOS Vehicle Description
The Mars Observer TOS weighs 24,000 pounds, with a
diameter of approximately 11.5 feet and length of just under
11 feet. The TOS system consists of flight vehicle hardware
and software, as well as associated ground support equipment.
This vehicle uses a United Technologies Chemical Systems
Division ORBUS-21 solid rocket motor main propulsion system,
a Honeywell, Inc., laser inertial navigation system, a
hydrazine reaction control system, and sequencing and power
subsystems. It has an inertial guidance and three-axis
control system, allowing the spacecraft to roll, pitch, and yaw.
The propulsion systems for TOS are a main propulsion
system and an attitude control system. The ORBUS-21 solid
rocket motor, the main propulsion for TOS, has a gimbaled, or
pivoting, nozzle to provide pitch and yaw control during
motor firing.
For the Mars Observer mission, TOS will be loaded with
approximately 22,000 pounds of the solid propellant HTPB
(hydroxyl terminated poly-butadiene). The motor can be
loaded with a reduced propellant quantity -- as low as 50
percent of the full load -- to handle a wide range of mission
payload and energy requirements.
Motor ignition is provided by a pyrotechnically
initiated solid propellant ignitor system. The vehicle's
hydrazine-powered reaction control system provides for
attitude control of the TOS and TOS/spacecraft combination
during solid rocket motor firing and during periods when the
large solid rocket motor is not firing. The system uses 12
attitude control system thrusters, or small maneuvering rockets.
TOS avionics hardware and software perform guidance
functions, manage the in-flight data, initiate the sequence
of events, determine the distance traveled and send back
engineering data on rocket systems operation during the
boosting phase of the mission.
The laser inertial navigation system is the heart of the
package which provides the required guidance, navigation and
control functions.
The First TOS Mission
Fifteen minutes after liftoff, the Titan III will
separate from the TOS and the Mars Observer spacecraft. For
about the next 20 minutes, TOS will provide attitude control
of the movements of the spacecraft. It will perform the
necessary calculations and generate the proper commands,
including rotating the spacecraft for thermal control, to
ensure the spacecraft is placed into the proper position for
rocket motor ignition which will propel Mars Observer on its
interplanetary course.
Approximately 20 minutes after separation from the Titan
III, the TOS solid rocket motor will fire for its 150-second
burn. The powered-flight period of TOS operation will last
approximately 2.5 minutes, during which the spacecraft/TOS
combination will reach a speed of 25,575 miles per hour.
Then, having done its job, it will separate from the Mars
Observer.
TRANSFER ORBIT STAGE CONFIGURATION
Launch Sequence graphic
Launch Vehicle and Payload Processing
On June 19, the Mars Observer spacecraft arrived at the
Kennedy Space Center (KSC) in an over-the-road
environmentally controlled payload transporter known as PETS,
the Payload Environmental Transportation System. It was
taken to Hangar AO located on Cape Canaveral Air Force
Station to begin checkout. Spacecraft subsystem testing was
performed, the integrity of the onboard propulsion system was
checked and compatibility with the world-wide Deep Space
Network tracking stations was verified.
On July 9, Mars Observer was again moved by the PETS
from Hangar AO to the Payload Hazardous Servicing Facility
(PHSF) on KSC. There, final electrical testing was
completed, the spacecraft was fueled with its flight load of
hydrazine propellant and a weight and balance measurement was
taken.
On Aug. 3, it was mated to the upper stage vehicle, the
Transfer Orbit Stage (TOS). The TOS arrived at the PHSF on
Jan. 10 to begin processing and electrical testing which was
completed in late June.
The Titan III rocket arrived from Martin Marietta in
Denver by C-5 aircraft on Feb. 28 and was taken to the
Vertical Integration Building (VIB) to begin build up. The
first and second stage engine installation activity began in
mid-March, and on March 26 the vehicle was erected on the
launch platform.
Meanwhile, in the near-by Solid Rocket Motor Assembly
Building (SMAB) the build-up of the solid rocket boosters
also began in mid-March and was completed on May 18. On June
24, the Titan core vehicle was moved from the VIB to the SMAB
for mating to the twin solid rocket booster stack. The
rollout of the complete Titan III vehicle to Launch Complex
40 occurred on June 2.
The integrated Mars Observer/Transfer Orbit Stage
payload was encapsulated in the Titan III nose fairing at the
PHSF on Aug. 19. It was transported to Launch Complex 40 on
Cape Canaveral Air Force Station on Aug. 21 and hoisted into
the clean room of the gantry-like mobile service tower and
mated to the rocket.
On Aug. 25 a routine inspection of the payload revealed
particulate contamination on the surface of the spacecraft.
The payload was demated and returned to the PHSF for cleaning
on Aug. 29. On Sept. 4 the payload was scheduled to be mated
to the launch vehicle. A countdown dress rehearsal is
scheduled for Sept. 17, with launch scheduled for Sept. 25.
LAUNCH COUNTDOWN AND FLIGHT CONTROL
The countdown for the launch of the Titan III with the
Mars Observer spacecraft will be conducted from a combination
of NASA and U.S. Air Force Facilities on Cape Canaveral Air
Force Station. The primary facility from which management
decisions will be made is the Mission Director's Center (MDC)
located in Hangar AE. This is the nerve center of expendable
vehicle launch operations. From here and the adjacent Launch
Vehicle Data Center (LVDC), the health of the launch vehicle
and the Mars Observer spacecraft will be monitored before launch.
Actual control of the Titan III rocket before launch,
and from where the terminal launch countdown events are
initiated, will be from the Vertical Integration Building
(VIB) in the Titan complex. Control of the upper stage
before launch, the Transfer Orbit Stage, will be from the TOS
Payload Operations Control Center (POCC) on Kennedy Space Center.
Also in Hangar AE is where NASA's central telemetry
facility, or telemetry lab, is located. During powered
flight performance data from the Titan III, the TOS and Mars
Observer will arrive here. The data will be recorded and
displayed, then forwarded to flight control areas. Among
those areas are the MDC and LVDC in Hangar AE, the Mars
Observer Mission Operations Center in nearby Hangar AO and
the TOS POCC.
All events which occur during powered flight will be
monitored and displayed in the Mission Director's Center.
Vehicle flight data will also be displayed in the LVDC and
the VIB. After payload separation, primary monitoring will
be from the Mars Observer Mission Operations Center in Hangar
AO, the TOS POCC at KSC and from Jet Propulsion Laboratory in
Pasadena, California.
Countdown Milestone Events:
T-Time
(minutes:seconds)
Call to stations
T-420 Power-up TOS
T-410 Titan Inertial Guidance System alignment complete
T-400 Range Safety holdfire checks
T-345 Load Mars Observer star catalog
T-255 Begin Titan III final checks
T-230 Titan III checks complete
T-150 Poll launch team for mobile service tower rollback
T-100 Mobile service tower in launch position
T-30 Enter planned 50-minute built-in hold
T-30 Resume countdown
T-25 Mars Observer to flight mode
T-10 Enter 10-minute built in hold/poll launch team
T-10 Resume countdown
T-07 Poll launch team for final status checks
T-05 Resume countdown
T-04 Mars Observer to internal power
T-2:30 Range Safety clear to launch
T-2:00 Start data recorders
T-1:55 Arm firing chain relay
T-1:05 Start launch sequence
T-1:03 Enter terminal count
T-0:50 TOS to inertial guidance
T-0:37 TOS to internal power
T-0:32 Titan III to internal power
T-0:16 Arm Range Safety Command Destruct system
T-0:02 Titan to inertial guidance/arm booster igniters
0.0 Sold rocket booster ignition
0.2 Liftoff
00:54 Maximum dynamic pressure
01:48 Titan core vehicle ignition
01:56 Solid rocket booster jettision
03:51 Jettision payload fairing
04:28 Stage 2 ignition
04:29 Stage 1 separation
08:06 Stage 2 cutoff
15:00 Vehicle/payload separation
31:20 TOS ignition
33:56 TOS burnout
53:31 TOS/Mars Observer separation
68:30 Deploy solar array for cruise
71:40 Deploy high gain antenna
75:26 Deploy Gamma Ray Spectrometer boom for cruise
76:00 Deploy Magnatometer boom for cruise
76:10 Turn on attitude control system
80:42 Turn on low gain transmitter
MARS OBSERVER/TITAN III/TOS TRACKING SUPPORT
Tracking data and telemetry for the Mars Observer/Titan
III/TOS launch will be provided by a combination of NASA and
U.S. Air Force ground stations down range and around the world.
Spacecraft X-band tracking data and telemetry will be
received by the Deep Space Network (DSN) managed by the Jet
Propulsion Laboratory, Pasadena, Calif.
Titan III and TOS S-band tracking data and telemetry
information and also coverage by C-band radars for ballistic
trajectory information will be handled by U.S Air Force
tracking stations and the NASA Spacecraft Tracking and Data
Network (STDN).
Data coverage also will be supplemented by U.S. Air
Force Advanced Range Instrumentation Aircraft (ARIA). Two
ARIA will provide support over the Atlantic Ocean and three
other ARIA will provide support in the Indian Ocean region.
Following is a partial list of primary tracking station
locations and the role they play, either S-band for telemetry
and tracking data or C-band for radar coverage and the span
of time during the flight when data can be supplied if the
launch occurs at the opening of the launch window:
% Merritt Island/Cape Canaveral (NASA S-band/USAF S-band C-Band) 0:00-8:00
% Jupiter Inlet (USAF S-band/C-band) 0:30 - 8:05
% Bermuda (NASA S-band/C-band) 4:12 - 10:48
% Antigua Island (USAF S-band/C-band) 6:10 - 11:48
% ARIA-Atlantic Region (USAF S-band) 13:00 - 17:00
% Canberra, Australia (NASA S-band/X-band) 49:00 - end of support
Communication After Launch
NASA's DSN has the responsibility to communicate with
the Mars Observer following injection into its trajectory to
Mars. The three Deep Space Communications Complexes, located
in Goldstone, Calif., Madrid, Spain and Canberra, will
provide the air-to-ground links communication links with the
spacecraft in Mars orbit. At its maximum distance from
Earth, the time required for a signal to be sent to the
spacecraft and be returned to Earth (called the round trip
light time) will be approximately 40 minutes.
Communications links which tie together all elements of
the project team on Earth are provided by the NASA
Communications Network (NASCOM) and the Program Support
Communications Network (PSCN).
NASA's Office of Space Communications provides the
overall program management for the communication system. The
STDN and NASCOM networks are managed by GSFC. The PSCN is
managed by the Marshall Space Flight Center, Huntsville, Ala.
The DSN is managed by JPL, in concert with Spain and Australia.
SALIENT FACTS ON SPEED AND DISTANCE
Speed in Earth orbit
(with respect to Earth) 17,300 mph (7.73 km/s)
Speed at TOS burnout
(with respect to Earth) 25,700 mph (11.5 km/s)
Average speed during cruise
(with respect to Sun) 56,000 mph (25.0 km/s)
Speed before Mars orbit insertion
maneuver (with respect to Mars) 11,800 mph (5.28 km/s)
Speed after Mars orbit insertion maneuver
(with respect to Mars) 10,200 mph (4.56 km/s)
Speed in mapping orbit
(with respect to Mars) 7,500 mph (3.35 km/s)
Distance traveled between Earth and Mars 450 million miles
(7.24 x 10^8 km)
Distance from Earth at Mars arrival 210 million miles
(3.4 x 10^8 km )
Distance from Earth during Min: 62 Mmi (108 km)
mapping phase Max: 230 Mmi (3.7 x 108 km)
Time for command to reach spacecraft Min: 5.5 minutes
during mapping phase Max: 20.5 minutes
Maximum acceleration on spacecraft (postlaunch) 0.1 G
(occurs during transfer to low orbit)
Navigation target diameter at Mars 300 miles (480 km)
(less than 1/10 of planet diameter)
SCIENCE OPERATIONS
The Mars Observer mission operations at the Jet
Propulsion Laboratory will be supported by NASA's Deep Space
Network (DSN) and the JPL Advanced Multimission Operations
System. The 34-meter (111- foot), high-efficiency
subnetwork, the newest of the DSN antenna subnets, will
provide daily uplink and downlink communications with the
spacecraft at X-band frequencies of 8.4 gigahertz. The 70-
meter (230-foot) antenna network also will provide periodic
very-long-baseline interferometry and real-time, high-rate
telemetry and radio science support to the mission.
The DSN facilities are located in Pasadena and
Goldstone, Calif.; Canberea, Australia; and Madrid, Spain.
The instrument scientists will remain at their home
institutions, from which they will access Mars Observer data
via a project database at JPL. Using workstations and
electronic communications links, scientists also will be
connected to the mission planning activities at JPL.
In the same way, data products returned to the JPL
database from the home institution for each of the
instruments will be sent electronically to other
investigators at their home institutions. This will allow
scientists to have ready access to science data without
moving to JPL for the duration of the mission.
More than 60 workstations will be connected to the
project database at JPL, a centralized repository for
downlink science and engineering telemetry data, ancillary
data including navigation data, and uplink command and
sequence data. This database, with about 30 gigabytes of on-
line storage, will be electronically available to the science
instrument investigators via NASCOM data links.
During the mapping phase, the instrument investigations
will return processed science data products to the database
at JPL for access by the interdisciplinary scientists and the
other investigation teams.
Forty-two participating scientists from universities and
scientific institutions in the United States, Russia, France,
Germany and Great Britain will join the permanent Mars
Observer science team once the mission is under way in
October 1992.
Investigators/spacecraft instrument graphic
MARS OBSERVER INVESTIGATORS
Gamma Ray Spectrometer (GRS)
TEAM LEADER: William V. Boynton, University of Arizona
James R. Arnold, University of California, San Diego
Peter Englert, San Jose State University
William C. Feldman, Los Alamos National Laboratory
Albert E. Metzger, Jet Propulsion Laboratory
Robert C. Reedy, Los Alamos National Laboratory
Steven W. Squyres, Cornell University
Jacob L. Trombka, Goddard Space Flight Center
Heinrich Wnke, Max Planck Institute for Chemistry
Johannes Brckner, Max Planck Institute for Chemistry
Darrell M. Drake, Los Alamos National Laboratory
Larry G. Evans, Computer Sciences Corporation
John G. Laros, Los Alamos National Laboratory
Richard D. Starr, Catholic University
Yu A. Surkov, Russia
Mars Observer Camera (MOC)
PRINCIPAL INVESTIGATOR: Michael C. Malin, Malin Space Science Systems, Inc.
G. Edward Danielson Jr., California Institute of Technology
Andrew P. Ingersoll, California Institute of Technology
Laurence A. Soderblom, U.S. Geological Survey
Joseph Veverka, Cornell University
Merton E. Davies, The RAND Corporation
William K. Hartmann, Science Applications International
Philip B. James, University of Toledo
Alfred S. McEwan, U.S. Geological Survey
Peter C. Thomas, Cornell University
Thermal Emission Spectrometer (TES)
PRINCIPAL INVESTIGATOR: Philip R. Christensen, Arizona State University
Donald A. Anderson, Arizona State University
Stillman C. Chase, Santa Barbara Research Center
Roger N. Clark, U.S. Geological Survey
Hugh H. Kieffer, U.S. Geological Survey
Michael C. Malin, Malin Space Science Systems, Inc.
John Pearl, Goddard Space Flight Center
Todd R. Clancy, University of Colorado
Barney J. Conrath, Goddard Space Flight Center
R.O. Kuzmin, Russia
Ted L. Roush, San Francisco State University
A.S. Selivanov, Russia
Pressure Modulator Infrared Radiometer (PMIRR)
PRINCIPAL INVESTIGATOR: Daniel J. McCleese, Jet Propulsion Laboratory
Robert D. Haskins, Jet Propulsion Laboratory
Conway B. Leovy, University of Washington
David A. Paige, University of California, Los Angeles
John T. Schofield, Jet Propulsion Laboratory
Fredric Taylor, University of Oxford
Richard W. Zurek, Jet Propulsion Laboratory
Michael D. Allison, Goddard Space Flight Center
Jeffrey R. Barnes, Oregon State University
Terry Z. Martin, Jet Propulsion Laboratory
Peter L. Read, University of Oxford
Mars Observer Laser Altimeter (MOLA)
PRINCIPAL INVESTIGATOR: David E. Smith, Goddard Space Flight Center
Herbert V. Frey, Goddard Space Flight Center
James B. Garvin, Goddard Space Flight Center
James W. Head, Brown University
James G. Marsh, Goddard Space Flight Center
Duane Muhleman, California Institute of Technology
Gordon H. Pettengill, Massachusetts Institute of Technology
Roger J. Phillips, Southern Methodist University
Sean C. Solomon, Massachusetts Institute of Technology
Maria T. Zuber, Goddard Space Flight Center
H. Jay Zwally, Goddard Space Flight Center
Bruce W. Banerdt, Jet Propulsion Laboratory
Thomas C. Duxbury, Jet Propulsion Laboratory
Radio Science (RS)
TEAM LEADER: G. Leonard Tyler, Stanford University
Georges Balmino, Centre National d'Etudes Spatiales (CNES), France
David Hinson, Stanford University
William L. Sjogren, Jet Propulsion Laboratory
David E. Smith, Goddard Space Flight Center
Richard Woo, Jet Propulsion Laboratory
E. L. Akim, Russia
John W. Armstrong, Jet Propulsion Laboratory
Michael F. Flasar, Goddard Space Flight Center
Richard A. Simpson, Stanford University
Magnetometer and Electron Reflectometer (MAG/ER)
PRINCIPAL INVESTIGATOR: Mario H. Acuna, Goddard Space Flight Center
Kinsey S. Anderson, University of California, Berkeley
Sigfried Bauer, University of Graz
Charles W. Carlson, University of California, Berkeley
Paul Cloutier, Rice University
John E. P. Connerney, Goddard Space Flight Center
David W. Curtis, University of California, Berkeley
Robert P. Lin, University of California, Berkeley
Michael Mayhew, National Science Foundation
Norman F. Ness, University of Delaware
Henri Reme, University of Paul Sabatier
Peter J. Wasilewski, Goddard Space Flight Center
M. Menvielle, Universit of Paris Sud, France
Diedrich M hlmann, German Aerospace Research Establishment, Germany
A.A. Ruzmaikin, Russia
James A. Slavin, Goddard Space Flight Center
A.V. Zakharov, Russia
INTERDISCIPLINARY SCIENTISTS
Raymond E. Arvidson, Washington University
Bruce Fegley Jr., Washington University
Michael H. Carr, U.S. Geological Survey
A. T. Bazilevsky, Russia
Matthew Golombek, Jet Propulsion Laboratory
Harry Y. McSween Jr., University of Tennessee
Andrew P. Ingersoll, California Institute of Technology
Howard Houben, Space Physics Research Institute
Bruce M. Jakosky, University of Colorado
L.V. Ksanfomality, Russia
Aaron P. Zent, Search for Extraterrestrial Intelligence (SETI) Institute
James B. Pollack, Ames Research Center
Robert M. Haberle, Ames Research Center
V.I. Moroz, Russia
Laurence A. Soderblom, U.S. Geological Survey
Ken Herkenhoff, Jet Propulsion Laboratory
Bruce C. Murray, California Institute of Technology
MARS OBSERVER MANAGEMENT
NASA HEADQUARTERS, WASHINGTON, D.C.
Office of Space Science and Applications
Dr. Lennard A. Fisk, Associate Administrator
Alphonso V. Diaz, Deputy Associate Administrator
Dr. Wesley T. Huntress, Director, Solar Systems Exploration Div.
Douglas R. Broome, Deputy Director, Solar System Exploration Div.
Dr. William L. Piotrowski, Chief, Flight Programs Branch and Mars
Observer Program Manager
William C. Panter, Mars Observer Deputy Program Manager
Dr. Bevin M. French, Mars Observer Program Scientist
Guenter K. Strobel, Planetary Flight Support Manager
Charles R. Gunn, Director, Expendable Launch Vehicles Office
B.C. Lam, Upper Stages Program Manager
Office of Space Communications
Charles T. Force, Associate Administrator for Space Communications
Jerry J. Fitts, Deputy Associate Administrator for Space Communications
Robert M. Hornstein, Director, Ground Networks Div.
JET PROPULSION LABORATORY, PASADENA, CALIF.
Dr. Edward C. Stone, Director
Larry N. Dumas, Deputy Director
John R. Casani, Assistant Laboratory Director, Flight Projects
David D. Evans, Mars Observer Project Manager
Glenn E. Cunningham, Mars Observer Deputy Project Director
Dr. Arden L. Albee, Mars Observer Project Scientist
Frank D. Palluconi, Mars Observer Deputy Project Scientist
Thomas E. Thorpe, Mars Observer Science Manager
George D. Pace, Mars Observer Spacecraft Manager
Gary L. Reisdorf, Mars Observer Payload Manager
Dr. Saterios S. Dallas, Mars Observer Mission Manager
Joseph Shaffer, Mars Observer Launch Vehicle Manager
Gail K. Robinson, Mars Observer Administration and Finance Manager
T. David Linich, Multi-Mission Operations Support Manager
Eugene S. Burke, Multi-Mission Operations Manager
Marvin Traxler, Tracking and Telecommunications Data Systems Manager
Dr. Peter Poon, Coordinator with Multimission Operations Systems Center
KENNEDY SPACE CENTER, FLA.
Robert L. Crippen, Director
James A. "Gene" Thomas, Deputy Director
John T. Conway, Director, Payload Management and Operations
James L. Womack, Director, Expendable Vehicles
George E. Looschen, Chief, Launch Operations Division
David C. Bragdon, Launch Vehicle/Payload Integration Manager
Floyd A. Curington, Chief, Project Planning and Support
James W. Meyer, Tracking and Range Coordinator
JoAnn H. Morgan, Director, Payload Projects Management
Gayle C. Hager, Mars Observer Launch Site Support Manager
Julie A. Scheringer, TOS Launch Site Support Manager
LEWIS RESEARCH CENTER, CLEVELAND
Lawrence J. Ross, Director
Dr. J. Stuart Fordyce, Deputy Director
Thomas H. Cochran, Director, Space Flight Systems
John W. Gibb, Manager, Launch Vehicle Project Office
Steven V. Szabo, Jr., Director, Engineering Directorate
Edward G. Stakolich, Titan Mission Manager
Edwin R. Procasky, Chief, System Engineering Office
Edwin T. Muckley, Chief, Mission and Vehicle Integration Office
MARSHALL SPACE FLIGHT CENTER, HUNTSVILLE, ALA.
Thomas J. Lee, Director
Dr. J. Wayne Littles, Deputy Director
Sidney P. Saucier, Manager, Space Systems Projects
Alvin E. Hughes, Manager, Upper Stage Projects
Robert W. Hughes, Upper Stages Chief Engineer
GODDARD SPACE FLIGHT CENTER, GREENBELT, MD.
Dr. John Klineberg, Director
Peter T. Burr, Deputy Director
Dr. Dale W. Harris, Director, Flight Projects Directorate
Jeremiah J. Madden, Associate Director of Flight Projects for Earth Observing
System (EOS)
Martin J. Donohoe, Project Manager for EOS Instruments Projects
Dr. Douglas D. McLennan, Manager for Mars Observer GRS
Bertrand L. Johnson, Jr., Manager for Mars Observer MOLA
Previous Mars missions/1 (graphic)
Previous Mars missions/2 (graphic)
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Anything is impossible if
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you don't attempt it.
|_____|/ |_|/ |_____|/ |
|
| 528.29 | Mars Observer launch date reaffirmed | PRAGMA::GRIFFIN | Dave Griffin | Sun Sep 20 1992 01:21 | 81 |
| Don Savage
Headquarters, Washington, D.C. September 18, 1992
George Diller
Kennedy Space Center, Fla.
Bob MacMillan
Jet Propulsion Laboratory, Pasadena, Calif.
NOTE TO EDITORS: N92-82
NASA today reaffirmed Friday, Sept. 25, as the target
launch date of the Mars Observer mission. Today's Launch
Readiness Review follows yesterday's successful launch day
dress rehearsal for the Titan III rocket.
The launch window opens at 12:27 p.m. EDT and closes at
2:27 p.m. EDT. The countdown lasts 8 hours including built-in
holds and will begin at 4:27 a.m. EDT.
The prelaunch news conference will be held at 11 a.m. EDT
Thursday, Sept. 24, at the Kennedy Space Center (KSC) News
Center. It will be carried live on NASA Select television.
Participating in the briefing will be:
Dr. Lennard Fisk, Associate Administrator, Office of
Space Science and Applications, NASA Headquarters,
Washington, D.C.
James Womack, NASA Launch Manager
Kennedy Space Center, Fla.
John Gibb, Titan Launch Vehicle Manager
Lewis Research Center, Cleveland
Sid Saucier, Director, Transfer Orbit Stage (TOS)
Marshall Space Flight Center, Huntsville, Ala.
David Evans, Mars Observer Project Manager
Jet Propulsion Laboratory, Pasadena, Calif.
John Weems, Launch Weather Officer
Cape Canaveral Forecast Facility, U.S. Air Force,
Fla.
On launch day, the KSC News Center and the Pass &
Identification Building for news media badging at Gate 2,
located on State Road 3, Merritt Island, will open at 8 a.m.
Media can view the launch from a remote press site
established on the NASA Causeway. All media will be bussed
from the Complex 39 Press Site to this location. Shuttle
buses will leave periodically starting at 8:30 a.m. with the
last bus departing at 11 a.m.
Live television coverage of the launch will begin at 11
a.m. EDT and will continue through launch plus 90 minutes. A
postlaunch news conference will be held at the KSC News Center
beginning at approximately launch plus 2 hours.
NASA Select is carried on Satcom F2-R, transponder 13,
72 degrees West longitude. A two-way question and answer
capability will be available from other NASA centers
for the prelaunch and postlaunch news conferences.
Special accreditation is necessary for the launch of
Mars Observer. Requests should be sent to:
Accreditation Section
KSC News Center
NASA PA-PIB
Kennedy Space Center, FL 32899
Telephone: 407/867-2468 FAX: 407/867-2692
Photographers desiring to establish remote cameras at
Complex 40 on L-1 day should contact the audio visual section
of the KSC News Center at 407/867-7819.
|
| 528.30 | Updates - August 31 to September 10 | VERGA::KLAES | All the Universe, or nothing! | Thu Sep 24 1992 16:06 | 688 |
| Article: 1828
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 08/31/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Tue, 1 Sep 1992 04:31:59 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus -TBD- Days
Date of report: 8-31-92 Time of report: 3:00 PM EDT
[There were no reports on 8-29-92 and 8-30-92]
The encapsulated spacecraft and TOS (Transfer Orbit Stage) were
removed from atop the Titan vehicle and returned to the PHSF
(Payload Hazardous Support Facility) on last Friday night, 8-28-92.
Saturday was occupied with setting up the support equipment to
remove the payload fairing. The fairing was opened at 5 pm on
Sunday evening, and the work platforms were installed round the
TOS/spacecraft stack. Access to the spacecraft was available at
4:30 am Monday morning. At that time extensive photo and video
documentation was begun. Additional samples of the contaminate
were taken from many areas of the spacecraft, TOS and the payload
fairing. At the time of this writing, the science payload teams
are performing detailed visual assessments of their instruments.
The extent of instrument cleaning and testing, if required, will be
the significant driver on the remaining schedule.
The early visual observations today revealed a fine layer of white
particles, much like dandruff, on the MOLA (Mars Observer Laser
Altimeter) mirror when the observation angle was such that a black
background was produced. This is consistent with what was observed
through the access port on the pad. It is assumed that this distribution
of particles exists over all the horizontal surfaces of the spacecraft.
This assumption will be verified when UV and high intensity white light
is substituted for the orange, diffuse ambient lighting in the PHSF
high bay. Some large particles were also observed.
Otherwise, we are proceeding down the flow plan established for
cleaning the spacecraft, although, because it took longer to de-
encapsulate and erect the work platforms than originally thought,
we are about 6 hours behind the plan. Cleaning operations are
expected through Saturday.
Titan is assessing their downstream flow, with and without a Launch
Day Dress Rehearsal. This information will be used to establish a
new launch readiness date. At this point, it is still too early to
project a firm new launch date. Rescheduling of the various
reviews that were postponed will be announced when the earliest
launch readiness date is established.
The source or sources of the contamination have not been
definitively established yet.
A high level investigative board is being established to assess the
contamination anomaly, launch pad procedures and the corrective
actions required.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Optimists live longer
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | than pessimists.
|_____|/ |_|/ |_____|/ |
Article: 1837
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 09/01/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Wed, 2 Sep 1992 23:33:02 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 23 Days
Date of report: 9-2-92 Time of report: 8:00 AM EDT
Cleaning of the spacecraft and the payload instruments was
completed yesterday afternoon. The MOLA (Mars Observer Laser
Altimeter) and TES (Thermal Emission Spectrometer) covers have been
replaced and a new removable cover for the MOC (Mars Observer Camera)
has been developed and installed. The MOLA and the new MOC cover
will remain on the instruments until shortly before launch.
TOS (Transfer Orbit Stage) and the payload fairing have also been
cleaned. All elements again meet the cleanliness inspection
requirement of VC-2.
Activities to remove the work platforms around the spacecraft and
TOS was started at 10 PM last night. This was followed by final
cleaning of the Titan boattail and extension module. The
encapsulation process will begin no later than 6 PM tonight. The
Titan pre-encapsulation review will be held today. A spacecraft
post-cleaning review will be held this morning.
The contamination investigation continues. No definitive source
has been found at this time, but numerous protective measures are
being taken to limit exposure to any new contamination from many
sources in the launch processing flow. The special investigative
board on the contamination incident meets here tomorrow and Friday.
Titan had a lightning strike very near the pad last Saturday after
the spacecraft was back in the PHSF (Payload Hazardous Support
Facility). As a result, Titan found some damage to their electronics
and will replace some units. The Titan damage search continues.
TOS, as previously reported, has identified a probable sneak
circuit which they believe caused their inability to turn-off
during a test on the pad before the cleaning activities. There are
several options for corrective action which will be decided upon today.
A new schedule events was established last night and is shown below:
o Remove work platforms 9-1-92 at 10 PM
o Start encapsulation 9-2-92 at 6 PM
o Transport to LC-40 9-4-92 early morning
o Titan Combined Systems Test 9-14-92
o Spacecraft Launch Readiness
Review 9-15/17-92
o Diaz' Pre-Flight Integration
Review 9-17-92 PM
o Launch Day Dress Rehearsal 9-16/18-92
(Simulated launch day is
9-17-92)
o Headquarters' Mission
Readiness Review 9-21-92 PM
o Launch Readiness Review 9-23-92
o Mission Director's Review 9-24-92
o Launch Not earlier than 9-25-92
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Anything is impossible if
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you don't attempt it.
|_____|/ |_|/ |_____|/ |
Article: 1841
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Launch Rescheduled for September 25
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Thu, 3 Sep 1992 05:26:30 GMT
Don Savage
Headquarters, Washington, D.C. September 2, 1992
(Phone: 202/453-8400)
George Diller
Kennedy Space Center, Fla.
(Phone: 407/867-2468)
Bob MacMillin
Jet Propulsion Laboratory, Pasadena, Calif.
(Phone: 818/354-5011)
LAUNCH ADVISORY
MARS OBSERVER LAUNCH ABOARD TITAN III RESCHEDULED
NASA today rescheduled the launch of Mars Observer aboard a Titan III
rocket from Launch Complex 40 for Friday, Sept. 25. The launch window
extends from 12:27 to 2:27 p.m. EDT.
The payload cleaning has been completed and re-encapsulation will begin
tonight. The payload will be transported from Kennedy Space Center to Complex
40 on Cape Canaveral Air Force Station late on Thursday night, Sept. 3, and
mated to the Titan III rocket early on Friday morning, Sept. 4. A countdown
dress rehearsal is scheduled for Sept. 17. Because there is no contingency
in this schedule, the launch date will be reviewed after the countdown dress
rehearsal.
Additional precautions have been taken at the launch pad and with the
spacecraft to assure that recontamination is unlikely to occur.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Anything is impossible if
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you don't attempt it.
|_____|/ |_|/ |_____|/ |
Article: 1863
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 09/03/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Fri, 4 Sep 1992 07:43:58 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 22 Days
Date of report: 9-3-92 Time of report: 6:30 PM EDT
Encapsulation of the Mars Observer and TOS (Transfer Orbit Stage)
was accomplished (for the second time) last night and this morning.
The encapsulated stack has been placed on the transporter and is
being wrapped for the journey to LC-40 (Launch Complex 40). Weather
permitting, the convoy will be ready to leave the PHSF (Payload
Hazardous Support Facility) at 10 PM.
A contamination sample was taken through the spacecraft access port
on the payload fairing this afternoon to verify that the spacecraft
is still clean. (It is still clean!) Additional samples will be
taken at various stages of the on-pad operations.
Titan has completed their search for lightning induced damage and
has taken all necessary corrective actions.
A Titan pre-mate review was conducted this afternoon. All elements
confirm that they are ready to transport and mate to the Titan.
The operation of the RLE (Remote Launch Equipment) has been reverified.
The payload fairing air conditioning system and GN2 purge systems have
been recertified. The science instrument purge system is flowing and
certified. A backup air conditioning system for the payload
fairing is available if any problem during transport prevents
getting the stack in the environmental shelter on the pad before
the sun comes up Friday morning. Although the pressures in the
spacecraft's bi-propellant tanks have dropped, due to helium
absorption, the project elected not to repressurize because the
operational and schedule risks involved now out weigh the potential
benefits later in the mission.
The Contamination Incident Red Team met today and heard the report
of the project's Blue Team on the topics of identification of the
contamination, possible sources, and protective actions taken. The
review continues on Friday with discussion of on-pad procedures
associated with the hurricane securing to assure that no
capabilities were compromised.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Anything is impossible if
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you don't attempt it.
|_____|/ |_|/ |_____|/ |
Article: 1870
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Activity Sheet
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Sat, 5 Sep 1992 02:59:11 GMT
Payload Test and Activity Sheet
Mars Observer
September 4, 1992
George H. Diller
Kennedy Space Center
407/867-2468
Spacecraft: Mars Observer
Upper Stage: Transfer Orbit Stage (TOS)
Vehicle: Titan III
Launch Pad: Complex 40
Launch Date: September 25, 1992 *
Launch Window: 12:27-2:27 p.m. EDT *
Azimuth: 93 - 108 degrees
Launch Opportunity: 9/16-10/13 (24 days)
* denotes change since last status
UPCOMING ACTIVITY: *
9/4 Hoist and mate payload to Titan III
9/5 TOS stand alone test (thru 9/6)
9/5 Mars Observer state of health checks (thru 9/9)
9/14 Titan III integrated Combined Systems Test (CST)
9/15 Operational Readiness Test (repeat)
9/17 Countdown Dress Rehearsal T-0
9/19 Launch vehicle ordnance installation
9/20 Load vehicle oxidizer
9/21 Load vehicle fuel
9/23 Range Safety command checks
9/24 Launch vehicle pressurization
9/25 Begin terminal count 3:57 a.m.
ACTIVITY COMPLETE:
1/10 TOS arrives PHSF
2/28 Titan III vehicle arrives at VIB
3/14 Engines Arrive
3/15 Begin solid rocket booster build-up
3/16 Install Titan 2nd Stage Engine
3/17 Install Titan 1st Stage Engines
3/26 Vehicle erection in Vehicle Integration Building (VIB)
5/18 Titan solid rocket build-up complete
6/15 Ship Mars Observer
6/19 Spacecraft arrival Hangar AO
6/22 Titan core vehicle Combined Systems Test (CST)
6/24 Move Titan core to Solid Motor Assembly Building
6/30 Titan/SRB mate complete
6/28 Mars Observer propulsion system leak checks
6/30 Solid rocket booster mating to core vehicle complete
7/02 Move Titan III to Launch Complex 40
7/03 Mars Observer Deep Space Network compatability test
7/08 Complete spacecraft subsystem testing
7/09 Mars Observer move from AO to PHSF
7/24 Mars Obsever fueling
7/25 Spacecraft pressurization
7/27 Spacecraft weight and balance
8/01 Mate TOS to Titan III adapter
8/03 Mate spacecraft to TOS upper stage
8/05 TOS/Mars Observer IVT
8/08 TOS fueling
8/19 Payload encapsulation
8/21 Move payload to Complex 40 and erect
8/25 Payload stand alone and state of health checks complete
8/26 Operational Readiness Test and Network Simulation
8/28 De-erect payload, return to PHSF
8/29 De-encapsulate payload
8/30 Payload inspections and contamination documentation
8/31 Begin payload cleaning
9/1 Spacecraft cleaning complete
9/2 Re-encapsulate spacecraft
9/3 Move payload from PHSF to Complex 40
# # #
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Anything is impossible if
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you don't attempt it.
|_____|/ |_|/ |_____|/ |
Article: 1875
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 09/04/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Sat, 5 Sep 1992 05:01:55 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 21 Days
Date of report: 9-4-92 Time of report: 2:30 PM EDT
The encapsulated spacecraft and TOS (Transfer Orbit Stage) were
transported to the launch pad for the second time early this morning.
The journey was punctuated with the traumatic events that have
seemed to be so characteristic of Mars Observer's launch campaign.
The stack left the PHSF (Payload Hazardous Support Facility) at
10:45 PM. Shortly after the caravan began, under good weather
conditions, the double plastic wrap covering the payload fairing
shredded and tore. At the 2:30 PM arrival at the gate to the pad,
about three quarters of the material covering the upper portion of
the fairing had ripped off. At the same time, an unexpected
thunderstorm approached. A decision was made to divert to the
re-planned contingency shelter in the SMARF building. Before that
plan could be implemented, the storm hit and it was decided that
being by the mobile service tower afforded better lightning protection
for the stack than being on the open roadway. The approach of
lightning required the pad to be cleared. After the rain and lightning
passed, a forecasted 1.5 to 2 hour clear period between storms was
judged to allow sufficient time to complete the hoisting of the stack
to atop the Titan. However, the next storm arrived earlier than
predicted with more rain and lightning. Finally, after two peltings
with heavy rain, the stack was hoisted and was inside the environmental
shelter at about 6:30 AM.
Titan reports that the payload fairing is water tight. We have
asked for specifications and test reports documenting that fact.
At this time, the final bolting of the stack to the Titan is being
accomplished. The air conditioning inlet port will be inspected
for water, and the payload fairing air conditioning will be
establish as soon as possible to purge the interior of any moisture
that may have entered. The science instrument purge was in
operation throughout the two storms.
The battery discharge cycle will be continued as soon as access to
the spacecraft connectors at level 11 of the environmental shelter
are available. The battery discharge activities will continue for
the next approximately seven days, and after battery charging, a
spacecraft GO/NO-GO test will be run.
The Contamination Incident Red Team concluded its investigation today.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Anything is impossible if
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you don't attempt it.
|_____|/ |_|/ |_____|/ |
Article: 1886
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 09/07/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Wed, 9 Sep 1992 05:33:06 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 18 Days
Date of report: 9-7-92 Time of report: 3:00 PM EDT
[There were no reports on 9-5-92 and 9-6-92.]
The environmental recording equipment was removed from the payload
fairing late Friday night after air conditioning was established.
The data indicate that the highest temperature reached was 79 F,
which is within the specified range. However, the relative
humidity reached 59% (the specification is less than 55%). At this
time, there is no evidence of water inside the payload fairing. We
are assessing the higher than spec humidity and the humidity
profile which occurred during the thunderstorms while the stack was
being prepared for hoisting.
A particle count was taken from an area near the MOLA (Mars Observer
Laser Altimeter) on Saturday morning as part of our continuing
contamination assessment plan. It did not show excessive particulate
accumulation after the air conditioning was established. Another
sample was taken Sunday morning and will be analyzed on Tuesday.
Subsequent samples will be taken every 48 hours.
The discharge portion of the battery reconditioning cycle was
completed on Sunday about mid-day, and the 40 hour charging
activity was begun. When the batteries are fully charged, the
Titan interface connectors will be mated, and a GO/NO GO SEPET will
be performed.
Titan is trouble shooting a failure monitor problem which occurred
today, and have put their subsequent testing on hold.
The schedule of reviews between now and launch have been revised to
include an additional meeting of the Contamination Incident Red
Team. The Spacecraft Launch Readiness has been reduced to one day.
o Titan Combined Systems Test 9-14-92
o Spacecraft Launch Readiness
Review 9-15-92 [NOTE CHANGE TO ONE DAY]
o Contamination Red Team 9-16-92 9:00 AM
o Diaz' Pre-Flight Integration
Review for TOS and Titan 9-16-92 1:00 PM
o Launch Day Dress Rehearsal 9-16/18-92
(Simulated launch day is 9-17-92)
o Headquarters' Mission
Readiness Review 9-21-92 3:15 PM
o Launch Readiness Review 9-23-92
o Mission Director's Review 9-24-92 9:00 AM
o Final Launch Readiness Review 9-24-92 1:00 PM
o Launch Not earlier than 9-25-92
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Anything is impossible if
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you don't attempt it.
|_____|/ |_|/ |_____|/ |
Article: 1887
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 09/08/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Wed, 9 Sep 1992 05:40:06 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 17 Days
Date of report: 9-8-92 Time of report: 4:30 PM EDT
Battery charging has been completed. The electrical interface
connectors with the Titan were mated today. A spacecraft power
turn-on is expected within the hour. The GO/NO-GO SEPET is
scheduled for tomorrow.
Titan recovered from their failure monitor problem and are back on
schedule.
The particulate sample taken this morning showed another red RTV
particle similar to those assumed to come from the payload fairing
air conditioning duct.
The payload fairing air conditioning temperature will be lowered to
about 60 F for about 24 hours to facilitate a test of TOS's (Transfer
Orbit Stage's) battery heater set point.
As a result of the trauma experienced by the spacecraft in the
contamination incident and due to the excessive humidity during
transport back to the launch pad, a decision has been made to
perform a GO/NO-GO test of the payload instruments (except MOLA
(Mars Observer Laser Altimeter)). This test will be scheduled when
the appropriate instrument operators can be in attendance.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Anything is impossible if
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you don't attempt it.
|_____|/ |_|/ |_____|/ |
Article: 1893
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 09/09/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Thu, 10 Sep 1992 06:59:56 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 16 Days
Date of report: 9-9-92 Time of report: 5:00 PM EDT
The new flight software load, version 6E, was loaded today. The
GO/NO-GO SEPET was performed. Due to a lightning clear of the
launch pad that occurred during mid-day, time was not available for
the PDS (Payload Data Subsystem) on-stand functional test. It will
be slipped to tomorrow.
The particle, obtained in Tuesday's sample and identified in
yesterday's report as being red RTV, has been actually shown to be
mostly aluminum and silicon.
The payload bench check out equipment operators will arrive for the
payload GO/NO-GO test that is now scheduled for Friday.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Anything is impossible if
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you don't attempt it.
|_____|/ |_|/ |_____|/ |
Article: 1896
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Activity Sheet
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Fri, 11 Sep 1992 02:20:16 GMT
Payload Test and Activity Sheet
Mars Observer
September 10, 1992
George H. Diller
Kennedy Space Center
407/867-2468
Spacecraft: Mars Observer
Upper Stage: Transfer Orbit Stage (TOS)
Vehicle: Titan III
Launch Pad: Complex 40
Launch Date: September 25, 1992
Launch Window: 12:27-2:27 p.m. EDT
Azimuth: 93 - 108 degrees
Launch Opportunity: 9/16-10/13 (24 days)
* denotes change since last status
UPCOMING ACTIVITY:
9/10 Payload data system on-stand functional test *
9/11 Mars Observer on-stand science instrument testing *
9/14 Titan III integrated Combined Systems Test (CST)
9/15 Operational Readiness Test (repeat)
9/17 Countdown Dress Rehearsal T-0
9/19 Launch vehicle ordnance installation
9/20 Load vehicle oxidizer
9/21 Load vehicle fuel
9/23 Range Safety command checks
9/24 Launch vehicle pressurization
9/25 Begin terminal count 3:57 a.m.
ACTIVITY COMPLETE:
1/10 TOS arrives PHSF
2/28 Titan III vehicle arrives at VIB
3/14 Engines Arrive
3/15 Begin solid rocket booster build-up
3/16 Install Titan 2nd Stage Engine
3/17 Install Titan 1st Stage Engines
3/26 Vehicle erection in Vehicle Integration Building (VIB)
5/18 Titan solid rocket build-up complete
6/15 Ship Mars Observer
6/19 Spacecraft arrival Hangar AO
6/22 Titan core vehicle Combined Systems Test (CST)
6/24 Move Titan core to Solid Motor Assembly Building
6/30 Titan/SRB mate complete
6/28 Mars Observer propulsion system leak checks
6/30 Solid rocket booster mating to core vehicle complete
7/02 Move Titan III to Launch Complex 40
7/03 Mars Observer Deep Space Network compatability test
7/08 Complete spacecraft subsystem testing
7/09 Mars Observer move from AO to PHSF
7/24 Mars Obsever fueling
7/25 Spacecraft pressurization
7/27 Spacecraft weight and balance
8/01 Mate TOS to Titan III adapter
8/03 Mate spacecraft to TOS upper stage
8/05 TOS/Mars Observer IVT
8/08 TOS fueling
8/19 Payload encapsulation
8/21 Move payload to Complex 40 and erect
8/23 Payload secured for hurricane threat
8/25 Resume testing/contamination discovered
8/26 Operational Readiness Test and Network Simulation
8/27 Payload stand alone and state of health checks complete
8/28 De-erect payload, return to PHSF
8/29 De-encapsulate payload
8/30 Payload inspections and contamination documentation
8/31 Begin payload cleaning
9/1 Spacecraft cleaning complete
9/2 Re-encapsulate spacecraft
9/3 Move payload from PHSF to Complex 40
9/4 Hoist and mate payload to Titan III
9/5 TOS stand alone test complete
9/9 Mars Observer electrical check (GO/NO SEPET) complete
# # #
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Anything is impossible if
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you don't attempt it.
|_____|/ |_|/ |_____|/ |
|
| 528.31 | Updates - September 10-23 | VERGA::KLAES | All the Universe, or nothing! | Thu Sep 24 1992 16:30 | 729 |
| Article: 1899
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 09/10/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Fri, 11 Sep 1992 07:52:30 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 15 Days
Date of report: 9-10-92 Time of report: 7:00 PM EDT
The PDS (Payload Data Subsystem) on stand functional test was
accomplished today without any problems.
A particulate sample was taken this morning as part of the
continuing program to assess any contamination buildup.
The spacecraft countdown dry was postponed until 9-15-92 because of
lightning all afternoon.
The science instrument GO/NO-GO tests will be performed tomorrow.
The payload fairing air conditioning temperature has been lowered
to 60 F to facilitate a test of TOS's (Transfer Orbit Stage's)
battery heater. However, the temperature at the TOS battery did not
get low enough today to conduct the test.
Titan is progressing well along their schedule toward launch.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Anything is impossible if
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you don't attempt it.
|_____|/ |_|/ |_____|/ |
Article: 1909
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 09/11/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Sat, 12 Sep 1992 07:08:22 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 14 Days
Date of report: 9-11-92 Time of report: 6:00 PM EDT
A lightning strike near the launch pad last night was of sufficient
energy to cause Titan, TOS (Transfer Orbit Stage) and the MO spacecraft
to initiate electrical damage searches today. None of the vehicles
found any problems.
The lightning damage search caused some delay in initiation of the
science payload GO/NO-GO tests today. As of this writing, PMIRR
(Pressure Modulator Infrared Radiometer), MAG/ER
(Magnetometer/Electron Reflectometer), and TES (Thermal Emission
Spectrometer) had successfully completed their tests, and testing
of the MOC (Mars Observer Camera) is process. The other instruments,
MOLA (Mars Observer Laser Altimeter), GRS (Gamma Ray Spectometer) and
MBR (Mars Balloon Relay), will be completed on Sunday.
On Saturday, STS-47 is scheduled for launch. During their launch
window, LC-40 (Launch Complex 40) will be secured, and the payload
fairing air conditioning shut off and replaced with the GN2 purge.
The procedures for this activity have been carefully reviewed and
modified as required. The GN2 gas has been recertified.
If STS-47 slips doesn't make their launch tomorrow or Sunday, there
is the likelihood of an impact to the Mars Observer launch schedule.
A voice simulation of the various GO/NO-GO polls during the Titan
countdown procedure was conducted this afternoon with satisfactory
results. All management and technical loops participated.
The Titan launch combined systems test will be conducted on Monday
with the spacecraft and TOS participating.
All elements are still on schedule for launch on 9-25-92.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Anything is impossible if
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you don't attempt it.
|_____|/ |_|/ |_____|/ |
Article: 1948
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 09/14/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Tue, 15 Sep 1992 06:40:02 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 11 Days
Date of report: 9-14-92 Time of report: 5:30 PM EDT
The science instrument GO/NO-GO tests that were started on Friday
were completed on Sunday without any problems. At this time we can
declare that the payload instruments are go for launch. The
operation of the USO (Ultra Stable Oscillator) will be verified for
the last time before launch during the countdown sequence.
During the STS-47 launch on Saturday, the payload fairing air
conditioning was removed and the nitrogen purge established.
Particulate samples taken from the spacecraft after the air
conditioning was re-established showed no unusual particulate
contamination.
The spacecraft and TOS (Transfer Orbit Stage) participated with the
Titan Combined Systems Test (CST) today without any problems. Titan,
however, experienced three problems which are under investigation at
this time. Should it be necessary to repeat the CST after Titan has
resolved its problems, there may be some impact to the launch schedule.
A report from the Titan anomaly team is expected at 7:30 AM tomorrow
(9/15).
During the remainder of today, the spacecraft launch team is
practicing the launch recycle procedure, and will continue with
spacecraft GO/NO-GO testing which will confirm no damage from last
Thursday night's lightning strike. Countdown practice is scheduled
for Tuesday. The Launch Day Dress Rehearsal activities begin on
Wednesday.
The Spacecraft Launch Readiness Review will be conducted tomorrow.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Anything is impossible if
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you don't attempt it.
|_____|/ |_|/ |_____|/ |
Article: 1975
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 09/17/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Thu, 17 Sep 1992 23:33:11 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 8 Days
Date of report: 9-17-92 Time of report: 5:00 AM EDT
Preparations for launch continue on schedule.
The spacecraft completed the GO/NO-GO testing on Tuesday to confirm
no lightning damage. Titan changed out the two units (a Remote
Measurement Unit and an Electromechanical Valve) found to be
defective during the Combined Systems Test (CST) last Monday.
Because testing of these replaced devices can be accomplished along
with other planned testing, the CST will not have to be repeated.
The Spacecraft Launch Readiness Review was held on Tuesday. The
second meeting of the Contamination Incident Red Team was held
yesterday (Wednesday) morning, and the NASA Headquarters Review of
Titan and TOS (Transfer Orbit Stage) readiness was held in the afternoon.
The result of all three meetings was confirmation to continue with the
launch process.
The spacecraft started the countdown for the Launch Day Dress
Rehearsal (LDDR) shortly after noon yesterday with spacecraft power
on. The procedure has been executed well. It has been determined
that some heater turn-ons will have to be moved to later in the
count to reduce the spacecraft temperature rise.
Today is the simulated launch day for the LDDR.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Quiet people aren't the
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | only ones who don't say
|_____|/ |_|/ |_____|/ | much.
Article: 1990
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update #2 - 09/17/92
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Fri, 18 Sep 1992 05:22:50 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 8 Days
Date of report: 9-17-92 Time of report: 4:15 PM EDT
The Launch Day Dress Rehearsal was completed today. The spacecraft
and the spacecraft launch team performed well. There was some
difficulty in the initial move of the Mobile Service Tower (MST)
from the service position to the park position which delayed the
sequence substantially. The simulated launch was still achieved
within the window. The approach of rain and thunderstorm caused
a decision to move the MST back to the service position as the
count progressed in order to protect the vehicles. TOS (Transfer
Orbit Stage) had an unexplained gyro response during the movement
of the MST. A post-test debriefing tomorrow morning will highlight
the lessons learned from this valuable experience.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Quiet people aren't the
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | only ones who don't say
|_____|/ |_|/ |_____|/ | much.
Article: 1997
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Activity Sheet
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Sat, 19 Sep 1992 04:12:43 GMT
Payload Test and Activity Sheet
Mars Observer
Sept. 18, 1992
George H. Diller
Kennedy Space Center
407/867-2468
Spacecraft: Mars Observer
Upper Stage: Transfer Orbit Stage (TOS)
Vehicle: Titan III
Launch Pad: Complex 40
Launch Date: Sept. 25, 1992
Launch Window: 12:27-2:27 p.m. EDT
Azimuth: 93 - 108 degrees
Launch Opportunity: 9/16-10/13 (24 days)
UPCOMING ACTIVITY:
9/19 Vehicle/payload ordnance installation
9/20 Load attitude control system fuel
9/20 Install SRB flight batteries
9/21 Load vehicle oxidizer
9/22 Load vehicle fuel
9/23 ordnance connections
9/23 Install Titan stage 1 and 2 flight batteries
9/24 Range Safety Command checks/pressurize first stage tank
9/24 Apply vehicle power
9/24 Guidance system checkout
9/24 Final MO contamination inspection/remove instrument covers
9/25 Pressurize second stage tank
9/25 Load Mars Observer star catalog
9/25 Begin terminal count 4:27 a.m.
ACTIVITY COMPLETE:
1/10 TOS arrives PHSF
2/28 Titan III vehicle arrives at VIB
3/14 Engines arrive
3/15 Begin solid rocket booster build-up
3/16 Install Titan 2nd Stage Engine
3/17 Install Titan 1st Stage Engines
3/26 Vehicle erection in Vehicle Integration Building (VIB)
5/18 Titan solid rocket build-up complete
6/15 Ship Mars Observer
6/19 Spacecraft arrival Hangar AO
6/22 Titan core vehicle Combined Systems Test (CST)
6/24 Move Titan core to Solid Motor Assembly Building
6/30 Titan/SRB mate complete
6/28 Mars Observer propulsion system leak checks
6/30 Solid rocket booster mating to core vehicle complete
7/02 Move Titan III to Launch Complex 40
7/03 Mars Observer Deep Space Network compatability test
7/08 Complete spacecraft subsystem testing
7/09 Mars Observer move from AO to PHSF
7/24 Mars Obsever fueling
7/25 Spacecraft pressurization
7/27 Spacecraft weight and balance
8/01 Mate TOS to Titan III adapter
8/03 Mate spacecraft to TOS upper stage
8/05 TOS/Mars Observer IVT
8/08 TOS fueling
8/19 Payload encapsulation
8/21 Move payload to Complex 40 and erect
8/23 Payload secured for hurricane threat
8/25 Resume testing/contamination discovered
8/26 Operational Readiness Test and Network Simulation
8/27 Payload stand alone and state of health checks complete
8/28 De-erect payload, return to PHSF
8/29 De-encapsulate payload
8/30 Payload inspections and contamination documentation
8/31 Begin payload cleaning
9/1 Spacecraft cleaning complete
9/2 Re-encapsulate spacecraft
9/3 Move payload from PHSF to Complex 40
9/4 Hoist and mate payload to Titan III
9/5 TOS stand alone test complete
9/9 Mars Observer electrical check (GO/NO SEPET) complete
9/10 Payload data system on-stand functional test
9/11 Mars Observer on-stand science instrument testing
9/14 Titan III integrated Combined Systems Test (CST)
9/15 Operational Readiness Test (repeat)
9/17 Countdown Dress Rehearsal T-0
# # #
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Quiet people aren't the
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | only ones who don't say
|_____|/ |_|/ |_____|/ | much.
Article: 1998
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Launch Advisory
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Sat, 19 Sep 1992 04:10:44 GMT
Don Savage
NASA Headquarters Sept. 18, 1992
202/453-8400
George Diller
Kennedy Space Center
407/867-2468
Bob MacMillan
Jet Propulsion Laboratory
818/354-5011
KSC Release No. 127 - 92
LAUNCH ADVISORY/NOTE TO EDITORS:
MARS OBSERVER LAUNCH DATE REAFFIRMED/PRELAUNCH BRIEFING SCHEDULED
With the launch day dress rehearsal for the Titan III rocket
and Mars Observer successfully completed yesterday, NASA today at
the conclusion of the Launch Readiness Review reaffirmed Friday,
Sept. 25 as the target launch date.
The launch window opens at 12:27 p.m. EDT and closes at 2:27
p.m. EDT. The countdown lasts eight hours including built-in
holds, and will begin at 4:27 a.m. EDT.
The prelaunch news conference will be held at 11 a.m. on
Thursday, Sept. 24, at the KSC News Center and will be carried
on NASA Select television. Participating in the briefing will
be:
Dr. Lennard Fisk, Associate Administrator for Space Science
and Applications, NASA Headquarters
James Womack, NASA Launch Manager
Kennedy Space Center
John Gibb, Titan Launch Vehicle Manager
Lewis Research Center
Sid Saucier, Director, Transfer Orbit Stage (TOS)
Marshall Space Flight Center
David Evans, Director, Mars Observer
Jet Propulsion Laboratory
John Weems, Launch Weather Officer
Cape Canaveral Forecast Facility, USAF
On launch day, the KSC News Center and the Pass &
Identification Building for news media badging at Gate 2, located
on State Road 3, Merritt Island will open at 8 a.m.
Media will view the launch from a remote press site
established on NASA Causeway. All media will be bussed from the
Complex 39 Press Site to this location. Shuttle buses will leave
periodically starting at 8:30 a.m. with the last bus departing
at 11 a.m.
Live television coverage of the launch will begin at 11 a.m.
EDT and will continue through launch plus 90 minutes. A post
launch news conference will be held at the KSC News Center
beginning at approximately launch plus two hours.
Audio of all NASA Select events will also be carried on the
V circuits which may be accessed directly by dialing 407/867-
1220...1240...1260. NASA Select is carried on GE Satcom F2-R,
transponder 13, located above the equator at 72 degrees West
longitude. A two-way question and answer capability will be
available from other NASA centers for the prelaunch and
postlaunch news conferences.
Special accreditation is necessary for the launch of Mars
Observer. Requests should be sent to:
Accreditation Section
KSC News Center
NASA PA-PIB
Kennedy Space Center, FL 32899
Telephone: 407/867-2468 FAX: 407/867-2692
Photographers desiring to establish remote cameras at
Complex 40 on L-1 day should contact the audio visual section of
the KSC News Center at 407/867-7819.
# # #
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Quiet people aren't the
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | only ones who don't say
|_____|/ |_|/ |_____|/ | much.
Article: 2002
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 09/19/92 (Launch -6 days)
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Sun, 20 Sep 1992 09:22:20 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 6 Days
Date of report: 9-19-92 Time of report: 3:30 PM EDT
The launch readiness process continues in good order toward a
scheduled launch on Friday, September 25, 1992, at 12:27 PM EDT.
Since the successful completion of the Launch Day Dress Rehearsal
(LDDR) last Thursday, several minor modifications have been made in
the Titan and spacecraft countdown procedures. TOS (Transfer Orbit
Stage) continues to work their observed anomalous inertial measurement
system readings during the LDDR and attributes them to motions sensed
as the result of the Mobile Service Tower being moved away from the
vehicles.
The KSC Readiness for Launch Review was held Friday morning.
On Friday afternoon, the spacecraft played back TOS telemetry data
recorded during the LDDR successfully verifying the TOS to
spacecraft telemetry interface. In addition, the Ultra Stable
Oscillator (USO) operation was verified. Each of these items
contribute to satisfying parts of the launch/hold criteria. Also,
tests of battery charging strategies designed to reduce battery
overheating while maintaining maximum charge for launch were
accomplished.
Today, the spacecraft supported the Titan's stray voltage tests.
The Headquarters' Mission Readiness Review will be held in
Washington, DC, on Monday afternoon.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Quiet people aren't the
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | only ones who don't say
|_____|/ |_|/ |_____|/ | much.
Article: 2020
Newsgroups: sci.space.news
From: yee@trident.arc.nasa.gov (Peter E. Yee)
Subject: STS-52 and Mars Observer preflight briefings set [NTE 92-83]
(Forwarded)
Sender: usenet@news.arc.nasa.gov
Organization: NASA Ames Research Center, Moffett Field, CA
Date: Tue, 22 Sep 1992 03:51:01 GMT
Mark Hess
Headquarters, Washington, D.C.
(Phone: 202/453-8536) September 21, 1992
Barbara Schwartz
Johnson Space Center, Houston
(Phone: 713/483-5111)
NOTE TO EDITORS: N92-83
STS-52 AND MARS OBSERVER PREFLIGHT BRIEFINGS SET
Briefings on Shuttle mission STS-52, scheduled for mid-October, and
the Mars Observer mission, to be launched Sept. 25, will take place Sept. 24
from 9 a.m. to 3:45 p.m. EDT.
TIME BRIEFING/BRIEFERS LOCATION
9:00 a.m. STS-52 Mission Overview JSC
Bob Castle, Lead Flight Director
10:00 Canadian Experiment-2 JSC
Bruce Aikenhead, Director General
Canadian Astronaut Program Office
10:30 LAGEOS-II Program Overview JSC
Louis O. Caudill, LAGEOS-II Program Manager (NASA Hqs.)
LAGEOS-II Science
Dr. Ronald Kolenkiewicz, LAGEOS-II Project Scientist (GSFC)
LAGEOS Mission
James Murphy, LAGEOS-II Project Manager (GSFC)
LAGEOS-II/IRIS
Roberto Ibba, LAGEOS-II/IRIS Program Manager (Italian Space Agency)
11:00 Mars Observer Briefing KSC
2:00 p.m. United States Microgravity Payload-1 Overview MSFC
Ed Valentine, USMP-1 Mission Manager (MSFC)
USMP-1 Science Overview
Dr. Sandor Lehoczky, USMP-1 Mission Scientist (MSFC)
Lambda Point Experiment
Dr. John Lipa, Principal Investigator, Stanford University
MEPHISTO Experiment
Jean-Jacques Favier, Principal Investigator
Commissariat a l'Energie Atomique
2:45 STS-52 Crew Briefing JSC
James D. Wetherbee (Cdr, USN), Commander
Michael A. Baker (Capt, USN), Pilot
William M. Shepherd (Capt, USN), Mission Specialist
Tamara E. Jernigan, Ph.D., Mission Specialist
Charles Lacy Veach, Mission Specialist
Steven G. MacLean, Ph.D., Payload Specialist, Canadian
Astronaut Program
The astronauts will be available for approximately an hour after the
briefings for round-robin interviews. Reporters wishing to participate in the
interview sessions should notify the JSC newsroom by noon on Sept. 23.
Only the briefings will be carried on NASA Select television with two-
way audio for questions from NASA Headquarters and other centers. NASA
Select programming is carried on SATCOM F2R, transponder 13, located at
72 degrees west longitude.
Article: 2026
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 09/22/92 (3 days to launch)
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Tue, 22 Sep 1992 23:14:20 GMT
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 3 Days
Date of report: 9-22-92 Time of report: 9:30 AM EDT
Launch preparations continue toward a scheduled launch on Friday,
September 25th at 12:27 PM EDT.
On Sunday, September 20th, a small fuel spill at LC-40 (Launch
Complex 40) prevented Titan from loading their attitude control
system fuel. This loading was postponed until this morning.
On Monday, September 21th, Titan loaded their oxidizer during the
day, and the spacecraft did additional tests to characterize the
battery charge/temperature management for launch day during the night.
The Headquarters' Mission Readiness Review was conducted Monday
afternoon in Washington, DC. Dr. Fisk gave his approval for
continuing with the launch preparations. The only issue in this
meeting was the establishment of the readiness of the Advanced
Range Instrumentation Aircraft (ARIA) as a launch hold criteria for
the early days of the remaining launch period.
Today, Titan is loading their attitude control fuel and their main
fuel tanks.
Data from the spacecraft's battery management tests will be
analyzed today. There is some possibility that additional tests
may be called for tonight.
TOS (Transfer Orbit Stage) has decided that the apparent anomalous
inertial measurement system data observed during the Launch Day Dress
Rehearsal is the normal response to the disturbance of the Mobile
Service Tower roll-back.
The L-2 day Launch Site Readiness Review will be held tomorrow.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Quiet people aren't the
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | only ones who don't say
|_____|/ |_|/ |_____|/ | much.
Article: 2038
Newsgroups: sci.space.news
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 09/23/92 (2 days to launch)
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Thu, 24 Sep 1992 06:53:33 GMT
Forwarded from Glenn Cunningham, Mars Observer Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 2 Days
Date of report: 9-23-92 Time of report: 6:00 PM EDT
Titan's fueling of their main tanks, which started on Tuesday,
continued into this morning. Ordinance installation for both Titan
and TOS (Transfer Orbit Stage) followed the fueling operations.
A good Operational Readiness Test (ORT) for transfer of the vehicle
state vector was conducted today. Data flow for backup spacecraft
telemetry from Canberra to Building AO was demonstrated.
[The Mars Observer MRT (Mission Readiness Test) held yesterday at SPC 40
(Signal Processing Center 40 in Canberra, Australia) was successful.
TOS and the Mars Observer telemetry processing was validated by
the project. Back feed of both TOS and 16 Kbits/sec MO spacecraft
data was also very successful. Canberra will be the first Deep Space
Network antenna that will acquire MO's X-band signal after launch.
Ron Baalke]
The Launch - 2 Day Readiness Review was held this morning. There
were only three open issues which will be worked off by tomorrow
morning. The only spacecraft issue involves working the details of
the revised battery charging/temperature management strategy with
the Titan countdown conductor which has been done at this writing.
The spacecraft, which is ready for launch, has been powered off
since early Tuesday morning.
Titan has a couple of problems which are launch constraints until
they are solved. First, the battery for the Wideband
Instrumentation System failed a leakage (voltage to case)
measurement. The spare battery was installed, but the failure must
be explained. Second, two initiators for the destruct system
failed bridgewire resistance test, and new ones are being obtained.
Again, the failure needs explanation. Lastly, the material in the
oxidizer vent ducts was found to be incompatible with the oxidizer,
and the ducts must be replaced tonight. Titan is now behind
schedule, and are hoping to catch up by tomorrow morning.
The NASA Administrator, Mr. Dan Goldin, spoke to a group of the
Mars Observer launch team personnel representing all the centers
and major contractors this afternoon. He was very enthusiastic
about the upcoming events.
Our prime concern at this time is the weather. We are constrained
by the approach of rain and lightning, and the wind direction is a
constraint relative to the spread of a toxic cloud should there be
a near-pad destruct. Weather, which would allow a launch, has been
marginal for the past day relative to these constraints.
Tomorrow, the MOC (Mars Observer Camera) cover, and the MOLA (Mars
Observer Laser Altimeter) cover and eye safe filter will be removed.
AT L-24 hours, the spacecraft will be powered on for final time for
launch preparations.
This is launch minus 42 hours and 27 minutes and counting......
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Quiet people aren't the
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | only ones who don't say
|_____|/ |_|/ |_____|/ | much.
|
| 528.32 | Update - September 24 | VERGA::KLAES | All the Universe, or nothing! | Fri Sep 25 1992 15:10 | 65 |
| Article: 26725
Newsgroups: alt.sci.planetary,sci.astro
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 09/24/92 (1 Day to Launch)
Sender: news@elroy.jpl.nasa.gov (Usenet)
Organization: Jet Propulsion Laboratory
Date: Fri, 25 Sep 1992 06:15:13 GMT
Fowarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
DAILY ACTIVITIES STATUS REPORT
FROM THE
KENNEDY SPACE CENTER/CAPE CANAVERAL AIR FORCE STATION
Launch Minus 1 Day
Date of report: 9-24-92 Time of report: 4:13 PM EDT
The Launch - 1 Day Mission Director's Readiness Review has concluded
with all participating agencies, except the Range, giving their
approval for proceeding with the launch of Mars Observer. The Range is
awaiting results of the Titan destruct system initiator failure analysis.
Titan is still several hours behind their timeline. The failed
Wideband Instrumentation System battery was found to have a pinhole
leak been cells which is thought not be a generic problem.
Installation of the new battery was held up for Range approval.
Ordinance installation took longer than expected. A new set of
destruct system initiators has been obtained and tested.
TOS (Transfer Orbit Stage) has discovered that they inadvertently used
two cadmium plated connector dust caps. These were dispositioned "use
as is" at the L-1 review this morning.
As a result of the delays at the pad, the spacecraft has not been
powered on yet, and the MOC (Mars Observer Camera) and MOLA (Mars
Observer Laser Altimeter) covers have not been removed. The power on
event may occur within the hour. This delay is not an impact to the
spacecraft countdown schedule. The cover removal may be delayed until
the time that the spacecraft enable plugs are installed tomorrow
morning, so as not to hold the crew here too late today.
The Mission Operations System reports that they have discovered a
flight rule violation in the C1 sequence which requires a modification
before loading on Saturday. A search for other violations in the C1
sequence that may have been introduced by changes in flight rules is
underway. Also, the Project Data Base catalog was garbled last night
by a possible hardware problem in a file server. An investigation is
underway with a potential change to a backup server being considered.
These issues are launch constraints until they are resolved.
The weather predicts for lightning and precipitation for tomorrow look
good. The toxic cloud movement constraint predict for tomorrow has
not yet been received.
This is launch minus 20 hours 14 minutes and counting....
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Quiet people aren't the
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | only ones who don't say
|_____|/ |_|/ |_____|/ | much.
|
| 528.33 | Mars Observer launch today at 12:27 pm EDT | VERGA::KLAES | All the Universe, or nothing! | Fri Sep 25 1992 15:11 | 81 |
| Article: 2730
From: clarinews@clarinet.com (UPI)
Newsgroups: clari.tw.space,clari.news.aviation,clari.news.military
Subject: NASA set to launch Mars probe Friday
Date: Thu, 24 Sep 92 22:27:54 PDT
CAPE CANAVERAL, Fla. (UPI) -- In the first American mission to
Mars in 17 years, NASA engineers Friday prepared to launch a $511
million probe to the red planet.
With forecasters calling for a 70-percent chance of good
weather, the Mars Observer was set to begin an 11-month,
450-million-mile journey with a ground-shaking liftoff from Cape
Canaveral Air Force Station's Launch Complex 40. Blastoff was
scheduled for 12:27 p.m. EDT.
``Rather than thinking of this as the end of some long hiatus
in studying Mars, we should think of it as the beginning of what we
hope will be a regular series of missions to explore Mars,'' said
Leonard Fisk, NASA associate administrator for space science.
NASA planned to use an untried, upper-stage rocket booster in
the flight, firing it 30 minutes after liftoff to propel the 5,672-pound
Mars Observer out of Earth orbit and onto a trajectory for the red planet.
If all goes well, Mars Observer, built by GE Astro-Space
Division of Princeton, N.J., will slip into an elliptical orbit around
Mars' poles on Aug. 24, 1993. It will be the first visit by an
American spacecraft to Mars since the Viking landers, launched in
1975, arrived in 1976.
Once the probe enters orbit, NASA plans to carry out a series
of maneuvers put Mars Observer into a circular, 235-mile-high orbit,
tilted 93 degrees to the equator.
After that, the solar-powered spacecraft will begin detailed
observations of the Mars on Dec. 16, 1993.
``Mars Observer will be the most capable spacecraft we have
placed in orbit around Mars,'' Fisk said. ``It will be in polar orbit
about Mars, and from this you can get truly global coverage of the planet.
``We'll use this to understand the geology and mineralogy of
the planet. We will map its surface features, its gravitational field;
we will search for Mars' magnetic field and study its atmosphere and
meteorology.'' he said.
Equipped with six state-of-the-art instruments, the probe will
study the physical and chemical composition of Mars in unprecedented detail.
A $20-million camera will take thousands of photographs,
helping researchers identify possible landing sites for future manned
and unmanned missions.
In all, NASA expects Mars Observer to beam back some 600 billion
bits of data over the course of a single, 687-day Martian year.
``I think it's a prerequisite that we do Mars Observer and
perhaps some other robotic missions before we're really ready to send
humans to Mars,'' said Wesley Huntress, director of NASA's solar
system exploration division. ``Mars Observer is going to provide us
the global database -- the global maps of the planet that we're going
to need in order to select landing sites for our subsequent robotic
landers, as well as to determine where it is we want to send our
humans, and what it is they will do when they get there.''
NASA anticipates spending a total of about $891 million on the
Mars Observer mission.
The space agency paid $511 million for the probe itself, plus
$150 million for its Titan 3 booster, built by Martin Marietta
Astronautics Group of Denver.
Additionally, NASA spent $100 million for the critical
Transfer Orbit Stage rocket, built by Martin Marietta for Orbital
Sciences Inc. of Fairfax, Va. The TOS will propel the space probe from
Earth to Mars.
Finally, NASA plans to spend another $130 million for data
analysis and spacecraft control over the life of the mission.
|
| 528.34 | | DECWIN::FISHER | I *hate* questionnaires--Worf | Fri Sep 25 1992 16:02 | 12 |
| T-30 minutes and holding. The hold is for "normal pad securing operations."
A few minutes ago they announced that the pad warning horn would be activated
in 5 minutes.
And finally, the pad folks are saying that they are ready to do page nn which
is called "T-50 minutes". I'm not clear if this means they are behind schedule
or not. The will be if they don't start the clock within seconds.
Also, the weather appears to be go.
Burns
|
| 528.35 | | DECWIN::FISHER | I *hate* questionnaires--Worf | Fri Sep 25 1992 16:19 | 9 |
| Still t-30 and holding. There must be some additionaly built in holds, though.
They said that if they started the count at 12:15, then t-0 would be 12:55 (EDT).
However, they will not start it as 12:15. There are still "Blue Badges" around.
That seems to mean that people have not completely cleared the area.
(There were just some people at the pad to had to insert some sort of plug (maybe
arm destruct??). I assume it is they who are not clear.
Burns
|
| 528.36 | | DECWIN::FISHER | I *hate* questionnaires--Worf | Fri Sep 25 1992 16:39 | 5 |
| D**n. They must have started the count. Suddenly all the phone lines are
busy. If anyone is watching via satellite, please take over and feed us the
info!
Burns
|
| 528.37 | | TROOA::BALDOCK | Chris Baldock | Fri Sep 25 1992 16:41 | 5 |
|
12:38 - Just heard on the news that the launch is postponed
indefinitely due to an electrical problem.
Chris
|
| 528.38 | | DECWIN::FISHER | I *hate* questionnaires--Worf | Fri Sep 25 1992 16:46 | 6 |
| re .37: Apparently not. They are going for a 1:05 launch.
I just got back in. They seem to be counting, coming up on T-10 minutes where
there is a built-in 10-minute hold.
Burns
|
| 528.39 | | TROOA::BALDOCK | Chris Baldock | Fri Sep 25 1992 16:51 | 5 |
|
Re .83: Like I said, the delay was for an indefinite amount of
time ;-) Let's hope that countdown clock keeps ticking!
Chris
|
| 528.40 | Now solids jettisoned and first stage engine has started | DECWIN::FISHER | I *hate* questionnaires--Worf | Fri Sep 25 1992 17:07 | 1 |
| LIFTOFF...Solids burning normally...liquid not on yet as planned
|
| 528.41 | no slipups this time!! | KAOFS::R_YURKIW | | Fri Sep 25 1992 17:19 | 3 |
| Lets hope they remembered to REMOVE the camera's dust covers.
|
| 528.42 | | DECWIN::FISHER | I *hate* questionnaires--Worf | Fri Sep 25 1992 17:20 | 16 |
| Stage 2 has cut off.
Only .3 miles off in apogee
.2 miles off in perigee
They controllers sound very thrilled...they keep saying stuff like "Almost NO
deviation. Oh, my goodness, only off by a couple decimals! Almost no
activity on attitude maneuver jets...just enough to let us know they are
working!
Etc.
TOS coming on in 2 minutes (don't know if that means firing or just powering
up the telemtry or something)
Burns
|
| 528.43 | Maybe an oh-oh | DECWIN::FISHER | I *hate* questionnaires--Worf | Fri Sep 25 1992 17:36 | 14 |
| They confirmed Titan separation, but they don't seem to have any TOS telemetry
even at the tracking ships.
They PA officer just came on to reassure us that that does not mean that TOS
did not burn.
Apparently the ships can't do as much as the fixed ground stations, so they are
waiting till Canberra acquires to try to figure out what is going on.
So they don't know if the TOS burn happened or not. The ships are tracking the
Titan, but no one cares about that. Not clear if they are getting any MO
telemetry, or if the expect to be.
Burns
|
| 528.44 | | DECWIN::FISHER | I *hate* questionnaires--Worf | Fri Sep 25 1992 17:45 | 6 |
| Ah...they are not expecting MO data for 50 minutes or so. However, ground
stations in S. Africa and others have not picked up the TOS, so they are fairly
sure that it is not transmitting. No more info will be available till
Canberra does (or does not) acquire the MO.
Burns
|
| 528.45 | Apparently a visual confirmation of TOS ignition | DECWIN::FISHER | I *hate* questionnaires--Worf | Fri Sep 25 1992 18:02 | 11 |
| The tracking aircraft reported a bright orange flash in the location where the
TOS should have been. They said this may indicate that the TOS ignited OK.
The MO transmitter is scheduled to come on at 1:24 into the mission, i.e. about
14:29 EDT.
TOS should be about to separate if all is well. Canberra would have acquired
the TOS signal by now if TOS s-band were running. So it appears that it is not.
They question is, is the TOS s-band transmitter in 1 piece (along with everything
else). <<Gulp>>
Burns
|
| 528.46 | YAAAAAAAAAHOOOOOOOOOOOOoo | DECWIN::FISHER | I *hate* questionnaires--Worf | Fri Sep 25 1992 18:33 | 5 |
| THEY GOT IT!!!!!! X-BAND LOCK FROM MO in Canberra! That means the GD TOS
did its job despite being silent about it!
Burns
|
| 528.47 | Mars Observer on its way | STAR::HUGHES | Captain Slog | Fri Sep 25 1992 20:59 | 10 |
| Yup, it is on it's way. Trajectory looks like a good TOS burn. TOS data
was being recorded by MO (as there is no backup telemetry on TOS) and
that should be sent back tomorrow.
There are indications of some minor problems on board MO, including
(you guessed it) indications that the HGA may not have unlatched.
The Titan moves away from the pad FAST!
gary
|
| 528.48 | Launch Day Observations | CXDOCS::J_BUTLER | E poi, si muove... | Mon Sep 28 1992 15:05 | 86 |
| Article 2057 of sci.space.news:
Newsgroups: sci.space.news
Path: nntpd2.cxo.dec.com!pa.dec.com!decwrl!ames!dont-send-mail-to-path-lines
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 09/25/92 (Launch Day)
Message-ID: <1992Sep26.012453.2754@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
Keywords: Mars Observer, JPL, KSC
Sender: news@elroy.jpl.nasa.gov (Usenet)
Nntp-Posting-Host: kelvin.jpl.nasa.gov
Reply-To: baalke@kelvin.jpl.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Sat, 26 Sep 1992 09:23:57 GMT
Approved: sci-space-news@ames.arc.nasa.gov
Lines: 67
MARS OBSERVER STATUS REPORT
Launch Day
September 25, 1992
The Mars Observer spacecraft was launched today after a 38 minute delay.
At 17:05:01 UTC, the Titan III solid rocket boosters burst to life and
leaped off the launch pad at a 98 degree flight azimuth. The Titan III
then proceeded to to deliver Mars Observer into Earth orbit. At one minute,
48 seconds after launch (+01:48), the Titan core vehicle ignited, as planned,
and could easily be verified with the long range cameras tracking the launch.
This was quickly followed by the solid rocket booster jettision at +01:56.
At +04:28, the second stage on the Titan ignited and the first stage
separation then followed. The second stage continued to burn until
it shutdown at +08:05, as planned. A trim velocity burn started at +09:22
and continued for 36 seconds. In less than 10 minutes, Mars Observer was now
in an Earth parking orbit. At +15:00, the Titan III separated from Mars
Observer. The Titan III had completed its part of the launch effort
flawlessly.
The next step at this point was that the two ARIA planes supporting
the launch were to acquire the S-band signal from the TOS (Transfer Orbit
Stage) upper stage. After several minutes, neither plane reported receiving
any signal from TOS. Did something happen? Did the TOS malfunction, or was
it still functioning properly, but was just not transmitting any telemetry
back to Earth? We did not know. This was the maiden flight of the TOS, and
some doubts began to creep forth. At +39:51, the TOS was to ignite its solid
rocket boosters to send Mars Observer from an Earth parking orbit onto a
trajectory to Mars. The time came and went, and still no signal from TOS.
We don't know if the burn occured or not, or if the spacecraft was still in
Earth orbit. At +51:03, DSS-46 (26 meter antenna at Canberra) was in position
to acquire the TOS signal. Still more silence from TOS. Then a report came
in that the ARIA planes visually saw a red glow in the sky at the time that
the TOS burn was to have occured, and this was encouraging news. At +53:31,
the Mars Observer spacecraft was scheduled to separate from the TOS, but we
could not confirm this without any feedback from TOS. The TOS was then
scheduled to perform a small delta burn at +57:31 to move itself away from
the spacecraft. Still no signal acquisition from TOS. Canberra was scheduled
to acquire the X-band downlink from Mars Observer at +01:24:00, but that was
still a good 30 minutes away at this point. We just had to sit and wait.
Three of the Canberra antennas were being used to acquire Mars Observer's
signal. We brought up the Canberra's telemetry displays on our monitors.
What Canberra saw, we would see at the same time here at JPL. We waited
for +01:24:00 to arrive. As +01:11:30 went by, Mars Observer was supposed to
deploy its High Gain Antenna, solar arrays and Magnetometer. Fifteen more
minutes to go. Since I've worked on the telemetry subsystem being used for
Mars Observer, I was very familiar with all of the fields on the displays
what they meant. The displays were showing red "OUT-OF-LOCKs", and if we get
a signal from Mars Observer then they would turn to green "IN-LOCKs".
As +01:24:00 approached, we could hear the commentary on NASA Select
mentioning that they were waiting for confirmation of spacecraft acquisition
from Canberra. We all turned our eyes to the displays waiting for our
telemetry subsystem to acquire a signal from Mars Observer. Then the DSA
field on the display went to a green IN-LOCK followed quickly by green IN-LOCKs
in the Frame Synchronizer and Reed Solomon fields. We've acquired the signal
from the spacecraft! The DSA SNR (signal-to-noise ratio) was over 20 with
the Reed Solomon SNR at 40. We were receiving a strong and clean signal.
TOS has done its job. Word of the signal acquisition was quickly relayed to
Kennedy Space Center, and we watched the mission controllers celebrate on
NASA Select. Mars Observer was OK and on its way to Mars.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Quiet people aren't the
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | only ones who don't say
|_____|/ |_|/ |_____|/ | much.
|
| 528.49 | Mars Observer Update 27 Sept 92 | CXDOCS::J_BUTLER | E poi, si muove... | Mon Sep 28 1992 15:09 | 92 |
| Article 2063 of sci.space.news:
Newsgroups: sci.space.news
Path: nntpd2.cxo.dec.com!nntpd.lkg.dec.com!news.crl.dec.com!deccrl!decwrl!sun-barr!ames!dont-send-mail-to-path-lines
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 09/27/92
Message-ID: <1992Sep28.151348.15658@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
Keywords: Mars Observer, JPL
Sender: news@elroy.jpl.nasa.gov (Usenet)
Nntp-Posting-Host: kelvin.jpl.nasa.gov
Reply-To: baalke@kelvin.jpl.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Mon, 28 Sep 1992 03:50:03 GMT
Approved: sci-space-news@ames.arc.nasa.gov
Lines: 73
Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER STATUS REPORT
September 27, 1992
All systems are operating normally on the Mars Observer
spacecraft on the second day following launch.
Mars Observer was launched at 1:05 p.m. Eastern
Daylight Time (10:05 a.m. Pacific Daylight Time) on Friday,
September 25, from Cape Canaveral Air Force Station, Florida.
Performance of the Titan III launch vehicle and Transfer Orbit
Stage (TOS) upper-stage booster appear to have been normal,
although telemetry was not received from the TOS during launch.
Approximately 1 hour, 10 minutes after launch, the
spacecraft executed commands to deploy its solar array and high-
gain antenna in cruise positions. Ground controllers did not
receive confirmation from microswitches onboard the spacecraft
that the high-gain antenna had latched in its cruise position
until 4:32 p.m. PDT, or about five hours later. They believe
that the antenna probably deployed most of the way immediately
but did not latch into position until later.
Other minor anomalies following launch have also been
resolved. When the sun sensor on the solar array did not acquire
the sun, the spacecraft's fault-protection software switched to a
secondary sun sensor, which acquired the sun and is operating
normally. Also during the first hours after launch, an unknown
torque on the spacecraft occurred which required action of
gyroscope-like reaction wheels to restabilize the spacecraft, but
this has not reoccurred.
Also on the first day after launch, a series of star
calibrations failed which caused the spacecraft to switch from
its normal cruise mode, called "array normal spin," to a mode in
which the spacecraft revolves in relation to the sun. Ground
controllers believe this may have been related to forces
introduced during the high-gain antenna deployment. On Saturday,
September 26, controllers sent the spacecraft commands to return
to its normal cruise mode. The spacecraft executed these
commands and has been operating normally since.
At about 4:35 a.m. PDT today, ground controllers sent
the spacecraft its first regular command load. Among other
tasks, these instruct Mars Observer to play back data recorded
onboard during the launch phase Friday. This will help evaluate
performance of the TOS booster.
The next major activity planned for Mars Observer is
deployment of booms for two of its science instruments, the gamma
ray spectrometer and the magnetometer. Controllers will transmit
commands for these events on Monday and the deployments will take
place Tuesday.
As of 12 noon PDT today, Mars Observer is approximately
700,000 kilometers (430,000 miles) from Earth, traveling at
13,000 kilometers per hour (8,060 miles per hour) with respect to
Earth, and 120,000 km/hr (74,400 mph) with respect to the sun.
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Quiet people aren't the
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | only ones who don't say
|_____|/ |_|/ |_____|/ | much.
|
| 528.50 | A dramatic beginning | VERGA::KLAES | All the Universe, or nothing! | Mon Sep 28 1992 17:34 | 176 |
| Article: 2736
From: clarinews@clarinet.com (WILLIAM HARWOOD, UPI Science Writer)
Newsgroups: clari.tw.space,clari.news.aviation,clari.news.military
Subject: Mars probe launched
Date: Fri, 25 Sep 92 14:27:59 PDT
CAPE CANAVERAL, Fla. (UPI) -- The first American voyage to
Mars in 17 years began Friday with the launch of NASA's Mars Observer
probe, kicking off an 891 million mission to look for future landing
sites and resolve long-standing mysteries about the red planet.
Despite a radio blackout before a critical rocket firing that
left flight controllers in the dark for nearly two hours, the costly
spacecraft was successfully boosted out of Earth orbit on an 11-month,
450-million-mile journey to Mars after a flawless trip into space atap
a commercial Titan 3 rocket.
The 11-month trek began at 1:05 p.m. EDT with a ground-shaking
liftoff from launch complex 40 at the Cape Canaveral Air Force Station
adjacent to the Kennedy Space Center. Liftoff came 38 minutes late
because of a minor technical glitch at the pad and concern about windy
weather.
``Liftoff! Liftoff of the Titan 3 rocket with the Mars Observer and
America's return to the red planet,'' said NASA commentator George
Diller from the launch control center.
Trailing a churning cloud of exhaust from its twin solid-fuel
rockets, the Titan 3, built by Martin Marietta Astronautics Group of
Denver, climbed gracefully into the afternoon sky and arced east over
the Atlantic Ocean trailing a fan-shaped jet of flame and smoke.
The $150 million Titan's second stage engines shut down as planned
eight minutes after liftoff, putting the Mars Observer and its $100
million Transfer Orbit Stage booster into a short-lived ``parking''
orbit with a high point of about 237 miles.
The next few moments were especially critical: for Mars Observer to
reach its target, the TOS rocket, making its first flight, had to work
perfectly. But to the dismay of flight controllers, the rocket's radio
transmitter apparently failed, leaving mission managers in the dark
about the health of the booster.
The time for the rocket's ignition came and went in silence, with no
data to confirm what might have happened high above the Indian Ocean.
Finally, 90 minutes after liftoff, a tracking station in Canberra,
Australia, picked up signals from Mars Observer exactly when and where
they would have been expected had the rocket fired as planned.
Telemetry data then confirmed the successful boost and relieved
flight controllers began rigging the probe for the long cruise to Mars.
Project manager David Evans said three apparently minor problems were
noticed: The probe's main radio antenna may not have fully deployed; a
sensor used to help orient the craft's solar panels lost track of the
sun at one point; and the system used to control the spacecraft's
orientation was not behaving as expected.
But Evans said engineers would have plenty of time to corrent any
such problems during the long cruise to Mars.
``We're not really concerned yet about any of those,'' he said at a
news conference. ``In general, everything else is fine and we're
delighted to be on the way to Mars. I appreciate the ride from the Titan
folks and TOS folks; they made it exciting.''
If all goes well, Mars Observer, built by GE Astro-Space Division of
Princeton, N.J., will slip into an elliptical orbit around Mars' poles
on Aug. 24, 1993. It will be the first visit by an American spacecraft
to Mars since the Viking landers were launched in 1975.
Once in orbit, a series of maneuvers will be carried out to put the
spacecraft into a circular 235-mile-high orbit tilted 93 degrees to the
equator. In such a polar orbit, the spacecraft's instruments can study
the entire planet as it rotates below.
Finally, on Dec. 16, 1993, Mars Observer finally will be ready to
begin detailed observations of the fourth planet from the sun.
``Mars Observer itself will be the most capable spacecraft we have
placed in orbit around Mars,'' said Lennard Fisk, NASA's associate
administrator for space science. ``It will be in polar orbit about Mars
and from this you can get truly global coverage of the planet.
``We'll use this to understand the geology and mineralogy of the
planet. We will map its surface features, it's gravitational field, we will
search for Mars' magnetic field and study its atmosphere and meteorology.''
Equipped with six state-of-the-art instruments, Mars Observer will
study the structure and composition of the planet's atmosphere, surface
and interior in unprecedented detail, beaming back more digital data
than all previous Mars missions combined.
Over the course of a 687-day martian year, a $20 million camera will
map the entire planet, taking thousands of photographs, some showing
details as small as 10 feet across, that will help researchers identify
possible landing sites for future manned and unmanned missions.
NASA paid $511 million for the Mars probe and $150 million for its
Titan 3 booster. Another $100 million was spent to buy the critical
Transfer Orbit Stage used to propel the spacecraft from Earth to Mars.
Finally, NASA plans to spend $130 million for data analysis and
spacecraft control over the life of the mission, pushing the total price
tag to some $891 million.
But scientists said the results would more than justify the high cost.
``We hope to be returning to Mars for the first time now in 17 years,
'' Fisk said. ``Rather than think of this as the end of some long hiatus
in studying Mars, we should think of it as the beginning of what we hope
will be a regular series of missions to explore Mars.''
Article: 2738
From: clarinews@clarinet.com (UPI)
Newsgroups: clari.tw.space,clari.news.gov.agency,clari.news.aviation
Subject: 'It was some sweating time'
Date: Fri, 25 Sep 92 21:22:06 PDT
CAPE CANAVERAL, Fla. (UPI) -- For 84 harrowing minutes, NASA
officials and space scientists waited anxiously for word on the fate
of a $511 million space probe designed to make America's first visit
to Mars in 17 years.
``It was some sweating time,'' said Sid Saucier, NASA's booster
project manager after the Mars Observer was found safely on its journey
to the red planet Friday.
The probe's launch initially went smoothly, with a Titan 3
rocket carrying thegnals from the craft shortly before activation of
the $100 million Transfer Orbit Stage rocket, which was needed to
shoot the probe out of Earth's orbit on its 11-month, 450-million-mile
journey to Mars.
With no data from the spacecraft, it was impossible to confirm
whether the 24,000-pound solid fuel booster had fired and whether the
probe was safe.
Engineers aboard aircraft over the Indian Ocean who were monitoring
the flight reported seeing a ``bright, orange flash'' in the sky where
the spacecraft should have been at the time it should have fired. But
they were unable to determine whether that flash represented trouble or
the plume from the stage's maiden voyage.
An uneasy silence fell over ground controlers as they waited
anxiously until about 2:30 p.m., when a ground station in Canberra,
Australia, finally picked up signals from the spacecraft.
``We've had confirmation that we have a healthy spacecraft on
target on its way to Mars,'' Diller said as ground controlers burst
into applause, cheered and hugged each other.
During a briefing after the launch, Mars Observer Project Manager
David Evans told his colleagues: ``We appreciate the ride, Titan folks
and (booster) folks. You made it exciting.''
J.R. Thompson, executive vice president for the booster's contractor,
Orbital Sciences Corp. of Fairfax, Va., was relieved. ``You get a little
nervous when you don't know the status, but it all seems like background
noise now,'' said Thompson, a former NASA official.
The exact cause of the problem was not immediately determined. NASA
planned to investigate the incident before that type of booster flies
again, officials said.
Scheduled to begin orbiting Mars in 1993, scientists hope the Mars
Observer will help them to determine whether Earth's future could be
linked to the history of Mars, the fourth planet from the Sun. Many
researchers believe that Mars was similar to Earth until it endured a
string of atmospheric changes.
``Mars Observer will tell us more about Mars than we've learned from
all previous missions to date,'' Evans said. ``By studying the evolution
of Mars ... we hope to develop a better understanding as to what is now
happening to planet Earth.''
|
| 528.51 | Mars Observer Update: 28 Sep 92 | CXDOCS::J_BUTLER | E poi, si muove... | Tue Sep 29 1992 13:29 | 98 |
| Article 2067 of sci.space.news:
Newsgroups: sci.space.news
Path: nntpd2.cxo.dec.com!nntpd.lkg.dec.com!engage.pko.dec.com!pa.dec.com!decwrl!ames!dont-send-mail-to-path-lines
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 09/28/92
Message-ID: <1992Sep29.000711.5608@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
Keywords: Mars Observer, JPL, KSC
Sender: news@elroy.jpl.nasa.gov (Usenet)
Nntp-Posting-Host: kelvin.jpl.nasa.gov
Reply-To: baalke@kelvin.jpl.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Tue, 29 Sep 1992 08:06:19 GMT
Approved: sci-space-news@ames.arc.nasa.gov
Lines: 79
Forwarded from Glenn Cunningham, Mars Observer Deputy Project Manager
MARS OBSERVER
OPERATIONS STATUS
September 28, 1992 at 8:00 AM PDT
During the early part of the past week, Mars Observer made good
progress toward launch. The battery management during countdown
was developed and tested. TOS (Transfer Orbit Stage) continued to
work on understanding the anomalous gyro reading observed during
the Launch Day Dress Rehearsal and concluded it was a normal
response to motions induced from moving the Mobile Service Tower.
Titan worked off a problem with a leaking battery cell, and a
problem with destruct system initiators.
Spacecraft power turn-on for launch, normally scheduled at L-24
hours, was delayed because Titan was behind schedule on L-1 day.
The spacecraft executed a normal countdown sequence with no
anomalies. The Titan countdown was delayed by two power failures
in the Vehicle Integration Building (VIB) where the Titan is
controlled, and by delays in clearing personnel from the pad.
During a good portion of the latter hours of the countdown, two
factors in the weather criteria for launch were red. In
addition, the predictions for a nitrogen tetroxide toxic plume of
greater than 5 parts per million to drift off the Federal
property in the event of a near-pad destruct of the Titan, caused
a potential launch hold for most of the morning. Upper level
winds also restricted the launch azimuth to less than 105 degree
which reduced the two hour launch window to one hour and 41
minutes.
Finally, at 17:05:01.496 on Friday, September 25, 1992, 38
minutes into the window, Mars Observer was launched.
The Titan performance as monitored by the down-range stations,
was good. However, the Advanced Range Instrumentation Aircraft
(ARIA) did not receive the Transfer Orbit Stage (TOS) S-band
carrier or telemetry, although a bright light (presumably the TOS
solid motor burn) was observed during the proper interval. The
Canberra DSN (Deep Space Network) stations, acquired the spacecraft's
X-band signal on schedule.
When the spacecraft was acquired, the solar array was properly
deployed, but the High Gain Antenna was not completely deployed.
The HGA telemetry deployment indication was received about five
and a half hours later, indicating that the boom was slow to
deploy. When the boom apparently latched, the attitude control
system lost its star reference, and transferred to a waiting
mode. Ground commands on Saturday night restored attitude
control to the proper mode - Array Normal Spin.
Temperatures of two of the science instruments, MOC (Mars Observer
Camera) and PMIRR (Pressure Modulator Infrared Radiometer),
were low requiring heaters to be turned on.
The first cruise sequence was loaded Sunday morning, and started
execution at 9:00 AM Sunday. All events are occurring properly.
During launch, the TOS telemetry data is recorded on the
spacecraft's recorders. Unfortunately, playback of the recorder
yesterday did not yield any data.
The trans-Mars orbit injection appears to be about 1.8 sigma
after two days of tracking data.
The second part of the first cruise sequence will be loaded on
schedule today. This sequence will extend the Magnetometer and
Gamma Ray Spectrometer booms to their cruise position on Tuesday.
The spacecraft and the mission operations system both appear to
be working in fine order.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Quiet people aren't the
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | only ones who don't say
|_____|/ |_|/ |_____|/ | much.
|
| 528.52 | | DECWIN::FISHER | I *hate* questionnaires--Worf | Tue Sep 29 1992 15:17 | 19 |
| A few things of interest, if anyone knows:
"During launch, the TOS telemetry data is recorded on the
spacecraft's recorders. Unfortunately, playback of the recorder
yesterday did not yield any data."
Does that mean that there was no data recorded, or no data to indicate what might
have gone wrong with TOS's telemetry. If there was no data period, that would
indicate that the problem was not with TOS's transmitter, but something earlier
in the chain, one would think.
-------------
Can one normally see a solid rocket burn on a spacecraft in orbit? Like comsats
doing their transfer orbit burn, for example? I don't remember hearing about
it. Interesting that the TOS burn was observable.
Burns
|
| 528.53 | | HANNAH::REITH | Jim HANNAH:: Reith DSG1/2E6 235-8039 | Tue Sep 29 1992 18:26 | 7 |
| I would think that if the data collection failed you would see a blank
carrier for the transmitter.
Re: Can one normally...
Mere mortals can't 8^) We can't check out tiles on Columbia (STS-1)
|
| 528.54 | | CXDOCS::J_BUTLER | E poi, si muove... | Tue Sep 29 1992 18:49 | 18 |
| From what I can gather, TOS did not transmit either to the ground or
to Mars Observer. Evidently, there was no data from TOS on the
playback.
With no data it is going to be rather more difficult to determine the
most likely cause.
As for observing vehicles in earth orbit, the government has developed
some rather sophisticated optical and "enhanced" optical equipment.
While in the Army as an Electronic Warfare officer I had an opportunity
to learn some of our capabilities in that area. The firing of an engine
as large as the TOS from LEO would not be difficult to observe...even
in "daylight."
Them TOS folk are in for some quite rigorous study for the next few
months...anybody know when TOS is supposed to fly next?
John B.
|
| 528.55 | | DECWIN::FISHER | I *hate* questionnaires--Worf | Tue Sep 29 1992 20:48 | 10 |
| I guess I sort of assumed that "national intelligence assets" could probably
observe something like a TOS burn. I inferred that they were saying it was
visible from this tracking plane, though, which I assumed did not have heavy-
duty spy stuff on it.
As to when TOS is supposed to fly again, I believe that they said in the post-
launch press conference that it is NOT scheduled to fly again. Of course they
are trying to get contracts, but...
Burns
|
| 528.56 | Sorry but my memory can't seem to fill in the blank | HANNAH::REITH | Jim HANNAH:: Reith DSG1/2E6 235-8039 | Wed Sep 30 1992 11:12 | 4 |
| I thought I read in some of the preliminary stuff for this mission that they
were the first launch but had expected to be the second but ________ had been
delayed beyond this launch window. That seemed to imply that ________ was
going to fly with it sometime in the future (i.e. didn't say cancelled)
|
| 528.57 | Mars Observer Mission Status: 29 Sep 92 | PONIL::J_BUTLER | E poi, si muove... | Wed Sep 30 1992 13:50 | 75 |
| Article 2081 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 09/29/92
Message-ID: <1992Sep30.054601.6790@news.arc.nasa.gov>
Followup-To: sci.space
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Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
September 29, 1992
7 p.m. Pacific Daylight Time
The Mars Observer spacecraft partially deployed its two
science booms today, setting the stage for the start of science
operations on Oct. 1, 1992.
The first boom carrying the gamma ray spectrometer was
successfully deployed at 4:20 p.m. PDT. The command to partially
extend the 6-meter (20-foot) boom to 1.6 meters (5 feet) took
three minutes and 36 seconds.
The second deployment to partially extend the magnetometer
boom occurred at 6:45 p.m. PDT. Deployment lasted 10 minutes and
the 6-meter (20-foot) boom was extended to 4.3 meters (14 feet).
Both booms will remain partially deployed during the 11-month
cruise to Mars. Once the spacecraft has entered orbit around
Mars in late August 1993, the booms will be fully extended.
Sunday ground controllers commanded the spacecraft to play
back data from the launch phase that would have allowed them to
evaluate the performance of the Transfer Orbit Stage (TOS)
booster. Upon playback, it appeared that there was no data
recorded from the TOS. Evidently there seemed to be a problem
which prevented the TOS radio system from sending TOS data to the
spacecraft tape recorder. The mission operations team is
planning to play back that portion of tape-recorded data again on
Oct. 7 to be sure there is no TOS data on the tape recorder.
All other minor problems have been resolved and spacecraft
systems are operating normally.
On the second day after a successful launch from Cape
Canaveral Air Force Station, the Mars Observer spacecraft is
about 1.3 million kilometers (820,000 miles) from Earth,
traveling at a speed of about 12,600 kilometers per hour (7,900
miles per hour) with respect to Earth. The spacecraft is
traveling at a heliocentric velocity of about 118,000 kilometers
per hour (74,300 miles per hour).
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Quiet people aren't the
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | only ones who don't say
|_____|/ |_|/ |_____|/ | much.
|
| 528.58 | Douglas Broome, Jr.; worked on Mars Observer | VERGA::KLAES | All the Universe, or nothing! | Wed Sep 30 1992 13:54 | 120 |
| From: DECWRL::"yee@trident.arc.nasa.gov" "Peter E. Yee" 29-SEP-1992
To: sci-space-news@ames.arc.nasa.gov
CC:
Subj: NASA Daily News for 09/29/92 (Forwarded)
Daily News
Tuesday, September 29, 1992 24-hour audio service at 202/755-1788
% NASA senior manager Doug Broome dies, led Hubble telescope effort;
% Marshall to support Honolulu Space Expo and Boston Star Trek exhibit.
* * * * * * * * * * * * * * * *
Douglas Broome, Jr., deputy director of Solar System Exploration, died
of liver cancer this Sunday, Sept. 27. He was 55. Broome was
instrumental in the recent Mars Observer launch and had worked
previously to restructure the planetary flight programs toward a more
efficient and lower cost program. Prior to his solar system job,
Broome had directed the Hubble Space Telescope program as manager of
the Astrophysics Division's Great Observatories Development Branch.
Broome began his NASA career in 1959 as an aerospace engineer at the
Langley Research Center where he worked on power systems for the
Mercury capsule. He moved to Houston's then Manned Spacecraft Center
in the 1960s to work on the Apollo program.
In 1970, Broome received the Presidential Medal of Freedom for his
skill and performance under pressure during the Apollo 13 mission. He
moved to NASA Headquarters in 1974 and managed a number of programs
including Nimbus, SeaSat and the Upper Atmosphere Research Satellite.
He received the NASA Medal for Outstanding Leadership in 1979 for the
Earth resources programs and again in 1990 for his management of the
Hubble program. He is survived by his wife, four sons, three
grandchildren and a brother.
* * * * * * * * * * * * * * * *
Marshall Space Flight Center education officials report they held a
Community Involvement Program at Weber State University, Ogden, Utah,
last week where 160 teachers from across the state participated. The
center also reports they are featuring Mission to Planet Earth at their
exhibit at the Pueblo, Colo. ,State Fair. The center will also support
the Hawaii Space Expo 92 exhibition in Honolulu, an international event
which will run through December. Marshall will also have exhibits on
the Hubble telescope, space station Freedom and the shuttle at a
complimentary exhibit to coincide with the Boston Museum of Science's
premiere of a Star Trek exhibition.
Here's the broadcast schedule for Public Affairs events on NASA Select
TV. Note that all events and times may change without notice, and that
all times listed are Eastern. Live indicates a program is transmitted
live.
Tuesday, September 29, 1992
Live 10:00 am STS-47 crew post-flight briefing from Johnson Space Center.
Live 12:00 pm NASA Today news program, today featuring a report on the
upcoming STS-52 mission; an update on the TOPEX/Poseidon
mission; a look at arecent test firing of a possible new solid
rocket nozzle; a report on a successful student sounding
rocket launch; a look forward to that point this winter when
the Pioneer Venus will decay out of its Venus orbit and burn
up in Venus' thick atmosphere; and a complimentary look at
recent discoveries about Venus from the Magellan spacecraft.
12:15 pm Pathway to the Stars.
12:30 pm Magnetic Effects in Space.
1:00 pm Safe Computing.
1:30 pm America's Wings.
2:00 pm Starfinder program #17.
2:15 pm Aeronautics & Space Report.
2:30 pm Four Days of Gemini.
3:00 pm Total Quality Management program #36
(University of New Mexico series).
4:00 pm 8:00 pm and 12:00 midnight - NASA Today
and subsequent programming repeat.
Wednesday, September 30, 1992
Live 12:00 pm NASA Today news program.
12:15 pm Aerospace Oddities.
12:30 pm Gyroscope in Space.
1:00 pm Freedom 7.
1:30 pm Setting the Stage for the Future.
2:00 pm Starfinder program #18.
2:15 pm Aeronautics & Space Report.
2:30 pm Four Rooms with an Earth View.
3:00 pm Total Quality Management program #37
(University of New Mexico series).
4:00 pm 8:00 pm and 12:00 midnight - NASA Today
and subsequent programming repeat.
Thursday, October 1, 1992
Live 12:00 pm NASA Today news program.
12:15 pm Flight without Wings.
12:30 pm Second Science Harvest.
1:00 pm Apollo 7.
1:30 pm Behind the Scenes at the Air & Space Museum.
2:00 pm Starfinder program #19.
2:15 pm Aeronautics & Space Report.
2:30 pm Adapting to Space.
3:00 pm Total Quality Management program #38
(University of New Mexico series).
4:00 pm 8:00 pm and 12:00 midnight - NASA Today
and subsequent programming repeat.
Friday, October 2, 1992
Live 12:00 pm NASA Today news program
12:15 pm Adventures in Research.
12:30 pm Regenerative Processes.
1:00 pm Flight of Apollo 8.
1:30 pm Progress in Aeronautics.
2:00 pm Starfinder program #20.
2:15 pm Aeronautics & Space Report.
2:30 pm Skylab - First 40 Days.
3:00 pm Total Quality Management program #39
(University of New Mexico series).
4:00 pm 8:00 pm and 12:00 midnight - NASA Today
and subsequent programming repeat.
This report is filed daily at noon, Monday through Friday. It is a
service of NASA's Office of Public Affairs. The editor is Charles
Redmond, 202/453-8425 or CREDMOND on NASAmail. NASA Select TV is
carried on GE Satcom F2R, transponder 13, C-Band, 72 degrees West
Longitude, transponder frequency is 3960 MegaHertz, audio subcarrier is
6.8 MHz, polarization is vertical.
|
| 528.59 | | DECWIN::FISHER | I *hate* questionnaires--Worf | Wed Sep 30 1992 15:47 | 14 |
| I think the blank in .56 is probably the Russion Mars expedition. It was
originally called Mars 92 as was to consist of an orbiter, penetrators, and a
balloon. MO has a radio relay so that data from the penetrators and balloon
etc can be relayed to Earth more often (Mars 92's orbital geometry was such
that it would only be able to relay a couple times per (month??) initially).
However, Mars 92 was delayed to the next opportunity, 1994 and became Mars
94. Now it has been split into two parts and is called Mars 94/96. In 94
they will send an orbiter (and I think penetrators). In 96, they will send the
balloon (and another orbiter???). Of course we are now coming toward the end
of MOs projected life, so it is not completely clear how useful the radio
relay will be.
Burns
|
| 528.60 | | STAR::HUGHES | Captain Slog | Wed Sep 30 1992 16:17 | 9 |
| The next payload to fly on TOS is ACTS, Advanced Communication
Technology Satellite, sometime next year I think. It will deployed in
LEO by a shuttle and the TOS will place it in GTO.
I got the impression that the visual observation of the burn was from
an observer on an ARIA. It is possible that they used some of the
optical tracking gear in Hawaii however.
gary
|
| 528.61 | ? sync lost | PORTIA::BIRO | | Fri Oct 02 1992 10:42 | 6 |
| I have heard that they have lost the sun sync or star calibration again
since they have deployed the booms, has anyone any more info... has
that Monster that guards Mars done it again..
john
|
| 528.62 | No Spacecraft Emergency | PONIL::J_BUTLER | E poi, si muove... | Fri Oct 02 1992 12:22 | 68 |
| Article 2095 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/01/92
Message-ID: <1992Oct1.220124.20362@news.arc.nasa.gov>
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[The Mars Observer spacecraft lost inertial reference on September 29, 1992,
and began sun coning at 7:58 PM PDT (in other words, the spaceraft lost its
bearings and began to search for the Sun to re-establish itself). The project
is attempting to command the spacecraft back into inertial reference. No
spacecraft emergency has been declared. The project also wants to better
characterize the downlink sequence.
Ron Baalke
]
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 1, 1992
11:00 AM PDT
Launch +6 days
The Mars Observer spacecraft is on a nominal trajectory for cruise
to Mars. At 6:41 PM PDT last evening, the spacecraft was real-time
commanded back to array normal spin state from the sun star init state
to which controllers had commanded it to on Tuesday evening. Preliminary
analysis of Tuesday's events indicate that the spacecraft may have lost
inertial reference due to boom deployments which had recently taken
place. Investigation is continuing.
At 8:33 PM PDT last evening, the spacecraft fault protection software
powered off the Celestial Sensor Assembly "Fan" A, and enable "Fan" B.
The switch was made automatically by on-board software because more than
4 consecutive transits were detected on the Celestial Sensor Assembly slit
A3. Investigation of this occurence is under way. The flight sequence
C1C load was uplinked at 10:30 PM PDT last evening for execution this
morning. C1C was successful in turning on the Gamma Ray Spectrometer (GRS)
and Magnetometer/Electron Reflectometer (MAG) instuments. The Payload Data
Subsystem (PDS) was also powered on. The spacecraft team subsystem verified
that data packets from GRS and MAG were being received by science teams, and
that PDS packets would be received shortly.
A real-time command to perform a Gamma Ray Spectrometer "Random
Access Memory Load" is planned for this morning.
The spacecraft status, as reported by the spacecraft team at 10:30
this morning is that all subsystems are go.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Einstein's brain is stored
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in a mason jar in a lab
|_____|/ |_|/ |_____|/ | in Wichita, Kansas.
|
| 528.63 | Mission Status 1-2 October | PONIL::J_BUTLER | E poi, si muove... | Mon Oct 05 1992 12:53 | 132 |
| Article 2109 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update #2 - 10/01/92
Message-ID: <1992Oct3.074324.20952@news.arc.nasa.gov>
Followup-To: sci.space
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Date: Sat, 3 Oct 1992 15:42:05 GMT
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Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
October 1, 1992
Two science instruments on the Mars Observer spacecraft --
the Gamma Ray Spectrometer and the Magnetometer/Electron
Reflectometer -- were turned on today for preliminary calibration
testing. The Magnetometer/Electron Reflectometer was turned on
at 9:10 a.m. Pacific Daylight Time and the Gamma Ray Spectrometer
was turned on at 9:15 a.m. PDT. The instruments are located on
the spacecraft's two 20-foot (6-meter) booms, which are now
partially deployed for the journey to Mars. The Gamma Ray
Spectrometer will remain on through the end of the mission, while
the Magnetometer will be powered off again on Tuesday, Oct. 6,
1992, and turned on later in the mission.
The Pressure Modulator Infrared Radiometer will also be
turned on tomorrow, Oct. 2, 1992, for one hour beginning at 9
a.m. PDT. Controllers will open the instrument's aperture and
radiator doors to make sure they are operating properly.
The spacecraft's Payload Data Subsystem was also powered on
to receive data from the instruments. The spacecraft team
verified that data packets from the two instruments were being
received today by the science teams.
The spacecraft is on its proper trajectory for cruise to
Mars and all other spacecraft systems are operating normally.
Today Mars Observer is about 1.1 million miles (1.9 million
kilometers) from Earth, traveling at a speed of about 7,800 miles
per hour (10,800 kilometers per hour) with respect to Earth. The
spacecraft is traveling at a heliocentric velocity of about
74,200 miles per hour (119,000 kilometers per hour).
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Einstein's brain is stored
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in a mason jar in a lab
|_____|/ |_|/ |_____|/ | in Wichita, Kansas.
Article 2112 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/02/92
Message-ID: <1992Oct3.151302.16439@news.arc.nasa.gov>
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 2, 1992
1:30 PM PDT
Launch +7 Days
The Mars Observer spacecraft is on a nominal trajectory for cruise to
Mars.
The Flight Sequence C1 C load continues to clock out as planned. After
powering on Gamma Ray Spectrometer (GRS) and Magnetometer/Electron
Reflectometer (MAG) instruments yesterday, the Pressure Modulator Infrared
Radiometer (PMIRR) was powered on today in order to open the aperture and
radiator doors to prepare for future operation. PMIRR is scheduled to be
powered off today. The magnetometer is scheduled to be powered off on
Tuesday, October 6th. GRS is to remain on through end of mission.
However, the GRS RAM load attempted yesterday experienced difficulties
and has not yet been completed. Management, instrument, and spacecraft
engineers are planning to retry the GRS RAM load this afternoon, with hard
restart of the GRS an option to be considered.
An expected momentum unloading event occurred last evening.
The Celestial Sensor Assembly "B" side continues to be in use. Teams are
continuing their investigation of what may have caused slit 3 on the A
side to have seen false star transits Wednesday.
Upcoming events include a command to power on a MAG heater, and to test
an injector heater.
As of 11:00 AM PDT this morning, the spacecraft status, as reported by
the Spacecraft Team, is that all subsystems are go.
This status will be updated Monday, October 5th at 11:00 AM PDT, or
sooner if events require.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Einstein's brain is stored
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in a mason jar in a lab
|_____|/ |_|/ |_____|/ | in Wichita, Kansas.
|
| 528.64 | Mars Observer Update - 10/05/92 | PONIL::J_BUTLER | E poi, si muove... | Tue Oct 06 1992 12:53 | 62 |
| Article 2117 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/05/92
Message-ID: <1992Oct5.212031.18484@news.arc.nasa.gov>
Followup-To: sci.space
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Forwarded from the Mars Observer Project.
MARS OBSERVER STATUS REPORT
October 5, 1992
11:00 AM PDT
Launch +10 days
(All times are PDT)
The Mars Observer spacecraft is on a nominal trajectory for cruise to
Mars.
The Flight Sequence C1 C load continues to clock out as planned, with
completion by the morning of October 6.
Flight Sequence C1 D executes at 9:00 on October 6 after C1 C completes.
C1 D includes the 3rd Digital Tape Recorder 3 playback looking for TOS
(Transfer Orbit Stage) indications; C1 D completes on the morning of
October 10.
Flight Sequence C2 executes October 10, at 9:00 AM. C2 includes
Trajectory Correction Maneuver 1.
The Celestial Sensor Assembly "B" side continues to be in use. Teams are
continuing their investigation of what may have caused slit 3 on the A
side to have seen false star transits Wednesday, September 30.
The GRS (Gamma Ray Spectrometer) RAM load attempted Thursday, October 1,
experienced difficulties and was not completed. Mission teams were
successful in completing the GRS Ram load on Saturday, October 3 . As of
this time, GRS is operating from RAM. Thermal subsystem team members
are keeping an eye on propellant tank temperatures that continue to
indicate higher temperatures than expected.
As of 10:30 AM this morning, the spacecraft status, as reported by the
Spacecraft Team, is that all subsystems are "Go".
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Einstein's brain is stored
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in a mason jar in a lab
|_____|/ |_|/ |_____|/ | in Wichita, Kansas.
|
| 528.65 | Mars Observer Update 10/06/92 | PONIL::J_BUTLER | E poi, si muove... | Wed Oct 07 1992 13:25 | 73 |
| Article 2127 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/06/92
Message-ID: <1992Oct6.203358.12311@news.arc.nasa.gov>
Followup-To: sci.space
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Date: Wed, 7 Oct 1992 04:33:09 GMT
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Forwarded from the Mars Observer Project.
MARS OBSERVER STATUS REPORT
October 6, 1992
11:20 AM PDT
Launch + 11 Days
(Note: all times are PDT)
The Mars Observer spacecraft is on a nominal trajectory for cruise to
Mars.
Flight Sequence C1 D was uplinked this morning for execution at 9:00 on
October 7. C1 D includes the 3rd Digital Tape Recorder 2 playback looking
for TOS (Transfer Orbit Stage) indications; C1 D completes on the morning of
October 10.
Just prior to this report, Spacecraft and MCT teams decided to uplink the
star/ephemeris load already sent up this morning for a second time. A
telemetry interruption occurred (Ground Communications Facility Interface
"crash") before command verification was received at JPL. A requested
playback of data from DSS-15 (Goldstone 34 meter antenna) recorders may not
be received by controllers before the useful life of the current on-board
star/ephemeris tables has expired if the re-uplink is not performed.
The "Use" command instructing the spacecraft to use the star/ephemeris
table loaded earlier today will be withheld pending a confirmed load command
verification.
The GRS (Gamma Ray Spectrometer) instrument team (University of Arizona)
reports that at about 5:00 AM PDT this morning, their instrument was running
from RAM. Two test sequences were successfully run, the first a power on of
the gamma high voltage for the first time to 900 V; the first real gamma
spectra have been collected. The second GRS sequence was the detailed
neutron test, intended to turn on the neutron high voltage and collect
spectra at staggered gains. The sequence ran as programmed, but the command
to turn on the high voltage was incorrectly prepared and sent a "turn off"
command instead.
Flight Sequence C2 executes October 10, at 9:00 AM. C2 includes
Trajectory Correction Maneuver 1.
The Celestial Sensor Assembly "B" side continues to be in use. Teams are
continuing their investigation of what may have caused slit 3 on the A
side to have seen false star transits Wednesday, September 30.
As of 10:30 AM this morning, the spacecraft status, as reported by the
Spacecraft Team, is that all subsystems are "Go".
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Einstein's brain is stored
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in a mason jar in a lab
|_____|/ |_|/ |_____|/ | in Wichita, Kansas.
|
| 528.66 | Mars Observer Update 10/07/92 | PONIL::J_BUTLER | E poi, si muove... | Wed Oct 07 1992 20:51 | 68 |
| Article 2146 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/07/92
Message-ID: <1992Oct7.193120.12712@news.arc.nasa.gov>
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 7, 1992
11:00 AM PDT
Launch +12 Days
(Note: All times are PDT)
The Mars Observer spacecraft is on a nominal trajectory for cruise to
Mars.
Flight Sequence C1 D is clocking out as planned. C1 D includes the 3rd
Digital Tape Recorder 2 playback looking for TOS (Transfer Orbit Stage)
indications.
The flight teams are quite active in preparing for Flight Sequence C2
which begins execution Saturday October 10, at 9:00 AM. C2, which
includes Trajectory Correction Maneuver 1, performs several steps to
prepare the spacecraft for ignition of the bi-propellant powered engines
before performing the "burn" at 3:00 PM, Saturday. The duration of
ignition will be 2 minutes and 9 seconds (129 seconds).
Because the C2 sequence powers off the spacecraft transmitter at 2:29 PM
and does not power it back on until 3:06 PM, 6 seconds after firing of the
propulsion system, there is a time delay expected between completion of
propulsion system firing and receipt of telemetry back at JPL of between
6 and 10 minutes.
The Spacecraft Team continues to carefully monitor bi-propellant tank
pressures and temperatures. While these indications are higher than were
expected, they have been stable throughout cruise to date, and are not
considered to be of great concern.
Investigation continues into the what may have caused the Celestial
Sensor Assembly "A" side to have seen false star transits last
Wednesday, causing a switch to the CSA "B" side.
There are no planned uplinks scheduled for today.
As of 10:30 AM this morning, the spacecraft status, as reported by the
Spacecraft Team, is that all subsystems are "Go".
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Einstein's brain is stored
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in a mason jar in a lab
|_____|/ |_|/ |_____|/ | in Wichita, Kansas.
|
| 528.67 | DSN Captures Missing TOS Data | PONIL::J_BUTLER | E poi, si muove... | Thu Oct 08 1992 15:00 | 52 |
| Article 2151 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update #2 - 10/07/92
Message-ID: <1992Oct7.234649.18675@news.arc.nasa.gov>
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 7, 1992
3:45 PM PDT
Launch +12 Days
(Note: all times are PDT)
The Mars Observer spacecraft remains on a nominal trajectory for cruise
to Mars.
Flight Sequence C1 D is clocking out as planned.
Team activities to optimize spacecraft and ground systems in preparation
for TCM-1 (Trajectory Correction Maneuver #1) at 3:00 PM Saturday are
continuing.
Word was received from Deep Space Network personnel that the 3rd playback
of Digital Tape Recorder 2 has successfully captured Transfer Orbit Stage
data at the DSN Station.
Confirmation of decommutation of this data is occurring presently.
The updated spacecraft status, as reported by the Spacecraft Team, is
that all subsystems are "Go".
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Einstein's brain is stored
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in a mason jar in a lab
|_____|/ |_|/ |_____|/ | in Wichita, Kansas.
|
| 528.68 | Mars Observer Update 10/08/92 | PONIL::J_BUTLER | E poi, si muove... | Fri Oct 09 1992 14:18 | 63 |
| Article 2157 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/08/92
Message-ID: <1992Oct8.211426.28046@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
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Organization: Jet Propulsion Laboratory
Date: Fri, 9 Oct 1992 05:13:25 GMT
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 8, 1992
11:00 AM PDT
Launch +13 Days
(Note: all times are PDT)
The Mars Observer spacecraft remains on a nominal trajectory for cruise
to Mars. The Spacecraft Team reports that as of 10:30 AM, all subsystems
are performing well.
Flight Sequence C1 D continues clocking out as planned. The 3rd Digital
Tape Recorder 2 playback looking for TOS (Transfer Orbit Stage) indications
has been successful. The Mars Observer DSN (Deep Space Network) Manager
reported today that 1 hour and 16 minutes of TOS data have been recovered,
in the correct data frame synchronization format. Deep Space Network
engineers are working to determine why the first two attempts to read the
data from Digital Tape Recorder 2 were unsuccessful and will report on
their findings.
The flight teams are working very hard to prepare for Flight Sequence C2
which begins execution Saturday October 10, at 9:00 AM. C2, which
includes Trajectory Correction Maneuver 1, performs several steps to
prepare the spacecraft for ignition of the bi-propellant powered engines
before performing the "burn" at 3:00 PM, Saturday. The duration of
ignition will be 2 minutes and 9 seconds (129 seconds).
The Spacecraft Team continues to carefully monitor bi-propellant tank
pressures and temperatures. While these indications remain higher than
were expected, they have been stable throughout cruise to date, and are
not considered to be of great concern. It is anticipated that consumption
of bi-propellants during the TCM-1 ignition will reduce tank pressure and
temperature indications to the expected ranges.
There are no planned uplinks scheduled for today.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Einstein's brain is stored
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in a mason jar in a lab
|_____|/ |_|/ |_____|/ | in Wichita, Kansas.
|
| 528.69 | Mars Observer Updates 1 & 2 for 10/09/92 | PONIL::J_BUTLER | E poi, si muove... | Fri Oct 09 1992 20:19 | 122 |
| Article 2162 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/09/92
Message-ID: <1992Oct9.183853.6613@news.arc.nasa.gov>
Followup-To: sci.space
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Organization: Jet Propulsion Laboratory
Date: Sat, 10 Oct 1992 02:38:11 GMT
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 9, 1992
11:00 AM PDT
Launch +14 Days
(Note: all times are PDT)
The Mars Observer spacecraft remains on a nominal trajectory for cruise
to Mars. The Spacecraft Team report as of 10:30 AM is that all subsystems
are performing well.
Flight Sequence C1 D continues clocking out as planned, ending shortly
before 9:00 AM Saturday, October 10th.
Flight Sequence C2, containing Trajectory Correction Maneuver 1, begins
execution Saturday October 10, at 9:00 AM. C2 performs several steps to
prepare for ignition of 2 of the 4 "main" 490 Newton bi-propellant
powered engines before performing the "burn" at 3:00 PM, Saturday. The
duration of ignition will be 2 minutes and 9 seconds (129 seconds).
There are no planned uplinks scheduled for today.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Einstein's brain is stored
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in a mason jar in a lab
|_____|/ |_|/ |_____|/ | in Wichita, Kansas.
Article 2163 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update #2 - 10/09/92
Message-ID: <1992Oct9.184039.6763@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
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Organization: Jet Propulsion Laboratory
Date: Sat, 10 Oct 1992 02:39:51 GMT
Approved: sci-space-news@ames.arc.nasa.gov
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Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
October 9, 1992
The Mars Observer spacecraft is scheduled to fire two of its
four main rocket thrusters tomorrow in the first trajectory
correction maneuver to occur since the spacecraft was launched on
Sept. 25, 1992.
The trajectory correction maneuver (TCM-1), considered one
of the more crucial cruise maneuvers, will involve firing two of
the spacecraft's large (490-Newton) thrusters. TCM-1 will
provide a velocity change of 50 meters per second (164 feet per
second) to the spacecraft's trajectory, thereby adjusting
slightly its path to Mars. TCM-1 will occur at 3 p.m. Pacific
Daylight Time and will take about two minutes. During this first
TCM, the spacecraft will be close enough to Earth to send 2-
kilobyte (2,000 bytes per second) engineering data in near real
time. Currently one-way light time from Earth to the spacecraft
is about 15 seconds.
The next TCM is scheduled for Jan. 8, 1993.
Flight controllers tried for the third time on Oct. 7 to
play back tape-recorded data of the Transfer Orbit Stage (TOS)
burn shortly after launch and were successful in receiving TOS
data. TOS flight operations staff will analyze the data to
evaluate TOS performance during the launch phase.
All spacecraft systems are operating as expected and teams
are working to optimize spacecraft and ground systems for
Saturday's events.
Today Mars Observer is about 4.5 million kilometers (2.6
million miles) from Earth, traveling at a speed of about 10,800
kilometers (7,600 miles per hour) with respect to Earth. The
spacecraft is traveling at a heliocentric velocity of about
119,000 kilometers per hour (74,000 miles per hour).
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Einstein's brain is stored
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in a mason jar in a lab
|_____|/ |_|/ |_____|/ | in Wichita, Kansas.
|
| 528.70 | Mars Observer Update 10/10/92 | PONIL::J_BUTLER | E poi, si muove... | Tue Oct 13 1992 12:47 | 52 |
| Article 2187 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/10/92 (TCM-1 Successful)
Message-ID: <1992Oct13.061247.4736@news.arc.nasa.gov>
Followup-To: sci.space
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Date: Sun, 11 Oct 1992 13:41:28 GMT
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 10, 1992
3:30 PM PDT
Launch +15 Days
The Mars Observer spacecraft remains on a nominal trajectory for cruise
to Mars and all subsystems are performing well.
Trajectory Correction Maneuver 1 occurred precisely on schedule at 3:00
PM PDT today, October 10th. Preliminary TCM-1 results based on observed
change in Doppler frequency and telemetry inputs are that the maneuver
was very successful. Ignition of 2 of the 4 "main" 490 Newton engines
lasted for 2 minutes and 13 seconds, changing the spacecraft's velocity by
50 meters per second as planned.
The C2 sequence, which contains the TCM-1 maneuver, continues to clock
out as planned. Following the maneuver, the spacecraft has returned to
array normal spin.
The formal trajectory assessment presentation by the MO Navigation team
will occur Monday, October 12th at 4:00 PM.
A series of non-stored commands are being sent to the spacecraft this
evening, and tomorrow to reconfigure to the nominal cruise state.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Einstein's brain is stored
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in a mason jar in a lab
|_____|/ |_|/ |_____|/ | in Wichita, Kansas.
|
| 528.71 | Mars Observer Updates for 10/12/92 | PONIL::J_BUTLER | E poi, si muove... | Tue Oct 13 1992 12:48 | 119 |
| Article 2191 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/12/92
Message-ID: <1992Oct13.065841.7348@news.arc.nasa.gov>
Followup-To: sci.space
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Date: Tue, 13 Oct 1992 04:13:13 GMT
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 12, 1992
11:00 AM PDT
Launch +17 Days
The Mars Observer spacecraft remains on a nominal trajectory for cruise
to Mars and all subsystems are performing well.
Trajectory Correction Maneuver 1 occurred precisely on schedule at 3:00
PM, PDT October 10th. Preliminary TCM-1 results based on observed
change in Doppler frequency and telemetry inputs indicated that the
maneuver was very successful. Ignition of 2 of the 4 "main" 490 Newton
engines lasted for 2 minutes and 13 seconds, changing the spacecraft's
velocity by 50 meters per second as planned. Following the maneuver,
commands stored in the spacecraft's command computer memory executed
to return it to array normal spin state.
The formal trajectory assessment presentation by the MO Navigation team
will occur today, October 12th at 4:00 PM at JPL. Those results will be
included in tomorrow's status update.
The C2 sequence, which contains the TCM-1 maneuver, continues to clock
out as planned, completing shortly before 9:00 AM, Tuesday, October 13.
Flight sequence C3 was uplinked to the spacecraft this morning, with
execution scheduled to begin at completion of C2.
Sequence C3, a 3-part load (C3 A, C3 B, and C3 C) is 35 days in duration
(launch +18 days to launch +53 days) and contains the payload checkout
activities to verify that all instruments and the Payload Data System
(PDS) survived launch and are operating properly. Highlights of C3 include
a contingency window for TCM-1 (now not required to be used for that
purpose), the Gamma Ray Spectrometer inner cruise calibration, and the
first third of the Mars Observer Camera "bakeout", which involves
activation of MOC heaters. Instrument teams will be very active in events
included in execution of this sequence.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Einstein's brain is stored
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in a mason jar in a lab
|_____|/ |_|/ |_____|/ | in Wichita, Kansas.
Article 2183 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update #2 - 10/12/92
Message-ID: <1992Oct13.034945.25403@news.arc.nasa.gov>
Followup-To: sci.space
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Organization: Jet Propulsion Laboratory
Date: Tue, 13 Oct 1992 11:48:35 GMT
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Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
October 12, 1992
The Mars Observer spacecraft successfully completed its
first trajectory correction maneuver (TCM-1) at 3:02 p.m. Pacific
Daylight Time on Oct. 10. The maneuver changed the spacecraft's
velocity by 50 meters per second (164 feet per second), thereby
slightly altering its interplanetary course to Mars. The burn
lasted two minutes and 13 seconds. The spacecraft was returned
to normal cruise mode, called the "array normal spin,"
thereafter.
The next trajectory correction maneuver, TCM-2, is scheduled
for Jan. 8, 1993.
All spacecraft systems are operating normally. Today the
spacecraft is about 5 million kilometers (3.2 million miles) from
Earth, traveling at a speed of about 10,800 kilometers per hour
(7,500 miles per hour) with respect to Earth. The spacecraft is
traveling at a heliocentric velocity of about 119,000 kilometers
per hour (74,000 miles per hour).
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Einstein's brain is stored
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in a mason jar in a lab
|_____|/ |_|/ |_____|/ | in Wichita, Kansas.
|
| 528.72 | The Mars "Face", Mars Observer, and JPL | VERGA::KLAES | All the Universe, or nothing! | Tue Oct 13 1992 22:28 | 94 |
| Article: 27339
From: higgins@fnalo.fnal.gov (Bill Higgins-- Beam Jockey)
Newsgroups: sci.astro
Subject: Plans to acquire Face images (was Re: Mars Observer and the "Face")
Date: 13 Oct 92 23:05:33 GMT
Organization: Fermi National Accelerator Laboratory
In article <1992Oct12.150056.9477@ryn.mro4.dec.com>,
randolph@est.enet.dec.com (Tom Randolph) writes:
> Can someone at NASA post NASA's thoughts one way or another regarding the
> Mars Observer and the Martian "face"? [...]
> Does NASA even have an opinion on this? Is any hi-res coverage planned? There
> are all kinds of rumors flying, including "the hi-res camera isn't easily
> pointable, so no hi-res coverage is planned"... how about clarification?
I passed on this request to a friend at the Jet Propulsion Laboratory,
and he provided this summary of what David D. Evans, Mars Observer
Project Manager at JPL, was saying to people who were writing to him
about Cydonia before the launch. (JPL manages the spacecraft under
contract to NASA, so this is about as authoritative as you can
possibly get.) I received permission to post this.
[begin quote from JPL]
The Mars Observer Project at JPL is certainly aware of the great
interest in the Cydonia region. The project's staff intend to do
their best to be responsive to requests for high-resolution
photographic coverage of the region.
They unfortunately cannot absolutely guarantee, however, that they
will obtain the requested Cydonia region coverage, although they
are optimistic that they can do so. The reasons have nothing to do
with politics, but rather with the nature of the Mars Observer
mission, of the camera, and of Mars itself.
The Mars Observer spacecraft will be in an orbit that will take it
over each part of the planet only once in each Martian year. In
order to achieve the highest possible resolution, the Mars Observer
Camera was designed with a very small field of view (only about 3
km (1.8 mi) wide). It physically cannot be pointed in any
direction except straight down. Thus, we will have, at best, one
or maybe two opportunities to photograph any 3 km square piece of
Mars. In addition, given the uncertainty in the position of each
orbit and the timing of the spacecraft within each orbit (resulting
from atmospheric drag because the spacecraft is so low), mission
controllers will not be able to predict precisely when Mars
Observer will fly over a specific location on Mars. Finally, even
if they are able to predict when the appropriate images should be
taken, Mars may not cooperate -- clouds, fogs, hazes, and dust
storms frequently obscure the surface.
Thus, whereas the project team fully expects to acquire images of
the Cydonia region, they cannot be absolutely certain that they
will acquire high-resolution images of any particular small feature.
There has also been some confusion about when these photos will be
released to the general public. We expect to release two kinds of
photo products. First of all, we will release selected prints of
interesting features on Mars to the news media, typically within a
week or two after acquisition. Cydonia area photos fall into this
category. Once the photos are released, they will be made available
for purchase by the general public through a local contractor.
The second set of data, comprising an immense data set of all photo
products of Mars, will be released in digital form, in several
increments, on CD-ROM diskettes within about six months from the
time these products are acquired. This is to allow sufficient time
for computer processing for time tagging, for orbital position
determination, etc., and for the project science team analysis and
correlation with data from other instruments. This digital data
set, which will be available from the National Space Science Data
Center in Greenbelt, Maryland, can be accessed by anyone with a
commercially available CD-ROM reader attached to their personal
computer.
[end quote from JPL; back to quoting Tom Randolph again]
> This is a hot topic of late over in
> alt.alien.visitors. It would probably be a good idea to head off the
> government conspiracy theories early and avoid the rush.
Go ahead and re-post if you like, Tom. No way am I gonna get
involved. Besides, those characters don't believe anybody who posts
from a government laboratory anyway. (-:
O~~* /_) ' / / /_/ ' , , ' ,_ _ \|/
- ~ -~~~~~~~~~~~/_) / / / / / / (_) (_) / / / _\~~~~~~~~~~~zap!
/ \ (_) (_) / | \
| | Bill Higgins Fermi National Accelerator Laboratory
\ / Bitnet: HIGGINS@FNAL.BITNET
- - Internet: HIGGINS@FNAL.FNAL.GOV
~ SPAN/Hepnet: 43011::HIGGINS
|
| 528.73 | Mars Observer Update 10/14/92 | CXDOCS::J_BUTLER | E poi, si muove... | Thu Oct 15 1992 20:30 | 45 |
| Article 2199 of sci.space.news:
Newsgroups: sci.space.news
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/14/92
Message-ID: <1992Oct14.225338.3937@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
Keywords: Mars Observer, JPL
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Organization: Jet Propulsion Laboratory
Date: Thu, 15 Oct 1992 06:52:58 GMT
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 14, 1992
11:00 AM PDT
Launch +19 Days
The Mars Observer spacecraft is on the correct trajectory for cruise to
Mars. The Spacecraft Team reports that all systems are performing well.
Flight Sequence C3 which performs instrument payload and payload data
system checkout is clocking out as planned towards its completion date on
November 17.
Analysis of yesterday's Payload Data System Memory Readout indicated an
anomaly that made it necessary to uplink a "fix" last evening. That repair
was successful and the PDS is operating out of RAM presently.
Turn on of the Mars Observer Camera is planned for later today.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Einstein's brain is stored
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in a mason jar in a lab
|_____|/ |_|/ |_____|/ | in Wichita, Kansas.
|
| 528.74 | Mars Observer Update 10/15/92 | PONIL::J_BUTLER | E poi, si muove... | Thu Oct 15 1992 21:20 | 57 |
| Article 2205 of sci.space.news:
Newsgroups: sci.space.news
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/15/92
Message-ID: <1992Oct15.213321.7582@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
Keywords: Mars Observer, JPL
Sender: news@elroy.jpl.nasa.gov (Usenet)
Nntp-Posting-Host: kelvin.jpl.nasa.gov
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Organization: Jet Propulsion Laboratory
Date: Fri, 16 Oct 1992 05:32:40 GMT
Approved: sci-space-news@ames.arc.nasa.gov
Lines: 38
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 15, 1992
11:00 AM PDT
Launch +20 Days
The Spacecraft Team reports that all Mars Observer subsystems are
performing well.
Flight Sequence C3 which performs instrument payload and payload data
system checkout is clocking out as planned towards its completion date on
November 17.
A more complete analysis of Tuesday's Payload Data System Memory
Readout determined that an error in a command component caused an
overlap in memory read producing an indication of a possible memory
error. Once that command error was identified and the correct command
uplinked, a subsequent readout indicated that RAM was loaded properly.
The PDS is currently operating out of RAM nominally. Future command
errors of this type will be eliminated upon completion of connection of
the PDS model to the Verification Test Laboratory, which is in progress.
The Mars Observer Camera has been powered on and an "all sky" image
taken. The MOC team is evaluating temperature data received in
preparation for activation of its "bakeout" heater, scheduled to take place
tomorrow.
Instruments teams are working to evaluate performance of all
instruments during C3 execution. Testing of the Mars Balloon Relay is
planned for Sunday, October 18.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If God had wanted us to
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | have elections, he would of
|_____|/ |_|/ |_____|/ | given us candidates.
|
| 528.75 | Mars Observer Update 10/16/92 | PONIL::J_BUTLER | E poi, si muove... | Mon Oct 19 1992 14:35 | 52 |
| Article 2213 of sci.space.news:
Newsgroups: sci.space.news
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/16/92
Message-ID: <1992Oct17.000714.29447@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
Keywords: Mars Observer, JPL
Sender: news@elroy.jpl.nasa.gov (Usenet)
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Organization: Jet Propulsion Laboratory
Date: Sat, 17 Oct 1992 08:06:47 GMT
Approved: sci-space-news@ames.arc.nasa.gov
Lines: 33
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 16, 1992
10:00 AM PDT
Launch +21 Days
The Spacecraft Team reports that all Mars Observer subsystems are
performing well.
Flight Sequence C3 which performs instrument payload and payload data
system checkout is clocking out as planned towards its completion date on
November 17.
Activation of the Mars Observer Camera "bakeout" heater is scheduled to
take place today.
A series of interactive commands have been sent to the Magnetometer to
begin instrument/spacecraft magnetic field characterization activities.
The Electron Reflectometer door was opened this morning. The
Magnetometer team is evaluating data already received.
The Gamma Ray Spectrometer team is receiving and evaluating instrument
data.
Testing of the Mars Balloon Relay is planned for Sunday, October 18.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If God had wanted us to
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | have elections, he would
|_____|/ |_|/ |_____|/ | have given us candidates.
|
| 528.76 | Mars Observer Update for 10/19/92 | CXDOCS::J_BUTLER | Annoy the media!! | Tue Oct 20 1992 13:27 | 46 |
| Article 2218 of sci.space.news:
Newsgroups: sci.space.news
Path: nntpd2.cxo.dec.com!pa.dec.com!oct17.dfe.dec.com!ryn.mro4.dec.com!dbased.nuo.dec.com!news.crl.dec.com!deccrl!caen!uakari.primate.wisc.edu!ames!dont-send-mail-to-path-lines
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/19/92
Message-ID: <1992Oct19.210255.21141@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
Keywords: Mars Observer, JPL
Sender: news@elroy.jpl.nasa.gov (Usenet)
Nntp-Posting-Host: kelvin.jpl.nasa.gov
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Organization: Jet Propulsion Laboratory
Date: Tue, 20 Oct 1992 05:02:20 GMT
Approved: sci-space-news@ames.arc.nasa.gov
Lines: 27
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 19, 1992
12:30 PM PDT
Launch +24 Days
The Spacecraft Team reports that all subsystems are performing
well and that no problems are being encountered.
Flight sequence C3 continues to clock out toward its November 17,
1992 completion date. C3 performs checkout of science payload
instruments to determine how well each survived launch stresses.
It also has loaded and initialized Payload Data System Random
Access Memory, from which the PDS is now operating.
Commands are being sent to several instruments today. The Mars
Observer Camera is being commanded to perform a focus check. The
Magnetometer and Gamma Ray Spectrometer are also being commanded
to perform additional activities.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If God had wanted us to
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | have elections, he would
|_____|/ |_|/ |_____|/ | have given us candidates.
|
| 528.77 | Mars Observer Update 10/20/92 | CXDOCS::J_BUTLER | Annoy the media!! | Tue Oct 20 1992 18:45 | 48 |
| Article 2243 of sci.space.news:
Newsgroups: sci.space.news
Path: nntpd2.cxo.dec.com!pa.dec.com!decwrl!ames!dont-send-mail-to-path-lines
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/20/92
Message-ID: <1992Oct20.180916.1174@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
Keywords: Mars Observer, JPL
Sender: news@elroy.jpl.nasa.gov (Usenet)
Nntp-Posting-Host: kelvin.jpl.nasa.gov
Reply-To: baalke@kelvin.jpl.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Wed, 21 Oct 1992 01:35:07 GMT
Approved: sci-space-news@ames.arc.nasa.gov
Lines: 29
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 20, 1992
10:30 AM PDT
Launch +25 Days
The Spacecraft Team reports that all Mars Observer subsystems are
performing well.
Flight Sequence C3 which performs instrument payload and payload data
system checkout continues clocking out as planned. Non-interactive
commands (instrument only, do not utilize spacecraft power resources)
are being sent to the Mars Observer Camera today. A command to test MOC
focus was uplinked yesterday; results of this test are presently being
analyzed.
Testing of the Mars Balloon Relay took place Sunday, October 18. A French
Team was present at Malin Space Science Systems in LaJolla to
participate. The test was successful in verifying power on and operation
consistent with pre-flight specifications.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If God had wanted us to
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | have elections, he would
|_____|/ |_|/ |_____|/ | have given us candidates.
|
| 528.78 | Mars Observer Update 10/21/92 | CXDOCS::J_BUTLER | Annoy the media!! | Thu Oct 22 1992 13:03 | 51 |
| Article 2254 of sci.space.news:
Newsgroups: sci.space.news
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/21/92
Message-ID: <1992Oct21.232546.17762@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
Keywords: Mars Observer, JPL
Sender: news@elroy.jpl.nasa.gov (Usenet)
Nntp-Posting-Host: kelvin.jpl.nasa.gov
Reply-To: baalke@kelvin.jpl.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Thu, 22 Oct 1992 07:25:06 GMT
Approved: sci-space-news@ames.arc.nasa.gov
Lines: 32
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 21, 1992
11:00 AM PDT
Launch +26 Days
Flight Sequence C3 which performs instrument payload and payload data
system checkout continues clocking out as planned.
The Mars Observer Camera was powered off late yesterday afternoon. Data
received during the pre-focus test which involved activation of MOC
heaters is being evaluated.
Three real-time commands have been uplinked today. Commands were sent
to the Gamma Ray Spectrometer and Thermal Emission Spectrometer, and
a maintenance "No-Op" command was sent to prevent the Command Loss
Timer from activating fault protection sequences. Current planning is to
send the latter command on a periodic basis.
The Attitude and Articulation Control subsystem is expecting a momentum
desaturation event at approximately 2:00 PM PDT tomorrow.
The Spacecraft Team reports that all Mars Observer subsystems continue
to perform well.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If God had wanted us to
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | have elections, he would
|_____|/ |_|/ |_____|/ | have given us candidates.
|
| 528.79 | Mars Observer Update 10/22/92 | CXDOCS::J_BUTLER | Annoy the media!! | Fri Oct 23 1992 12:37 | 49 |
| Article 2257 of sci.space.news:
Newsgroups: sci.space.news
Path: nntpd2.cxo.dec.com!pa.dec.com!decwrl!purdue!ames!dont-send-mail-to-path-lines
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/22/92
Message-ID: <1992Oct22.184812.16333@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
Keywords: Mars Observer, JPL
Sender: news@elroy.jpl.nasa.gov (Usenet)
Nntp-Posting-Host: kelvin.jpl.nasa.gov
Reply-To: baalke@kelvin.jpl.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Fri, 23 Oct 1992 02:47:16 GMT
Approved: sci-space-news@ames.arc.nasa.gov
Lines: 30
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 22, 1992
11:00 AM PDT
Launch +27 Days
Flight Sequence C3 continues clocking out as planned, performing
instrument payload and payload data system checkout.
The Mars Observer Laser Altimeter (MOLA) will be powered on at 12:00
Noon, PDT by the stored sequence. The test, to determine how well the
MOLA survived launch, is scheduled to last 3 hours after which time the
instrument will be powered off. Flight teams have also uplinked a
precautionary non-interactive MOLA power off command to be executed in
the unlikely event the instrument would need to be powered off prior to
completion of the 3 hour test.
Attitude and Articulation Control subsystem engineers are expecting a
momentum desaturation event this afternoon.
The Spacecraft Team reports that all Mars Observer subsystems continue
to perform well.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If God had wanted us to
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | have elections, he would
|_____|/ |_|/ |_____|/ | have given us candidates.
|
| 528.80 | Mars Observer Updates 1 & 2 -- 10/23/92 | CXDOCS::J_BUTLER | Annoy the media!! | Mon Oct 26 1992 13:10 | 123 |
| Article 50489 of sci.space:
Xref: nntpd2.cxo.dec.com sci.space:50489 sci.astro:27798 alt.sci.planetary:174
Newsgroups: sci.space,sci.astro,alt.sci.planetary
Path: nntpd2.cxo.dec.com!pa.dec.com!decwrl!elroy.jpl.nasa.gov!kelvin.jpl.nasa.gov!baalke
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/23/92
Message-ID: <1992Oct23.184653.3528@elroy.jpl.nasa.gov>
News-Software: VAX/VMS VNEWS 1.3-4
Keywords: Mars Observer, JPL
Sender: news@elroy.jpl.nasa.gov (Usenet)
Nntp-Posting-Host: kelvin.jpl.nasa.gov
Reply-To: baalke@kelvin.jpl.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Sat, 24 Oct 1992 02:46:30 GMT
Lines: 38
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 23, 1992
11:00 AM PDT
Launch +28 Days
Flight sequence C3 execution continues. The C3 A load, which began
execution at 9:00 AM, PDT on October 13, will complete at 1:00 PM PDT,
Saturday, October 24. C3 A performed Payload Data System,
Magnetometer/Electron Reflectometer, Gamma Ray Spectrometer, Mars
Observer Camera, Mars Balloon Relay, Thermal Emission Spectrometer, and
Mars Observer Laser Altimeter instrument checkouts to determine payload
health after launch. C3 A also opened Pressure Modulator Infrared
Radiometer aperture and radiator cover doors, and performed a Radio
Science Ultra Stable Oscillator test.
The time allocated to C3 load B will not be utilized. C3 B provided a
contingency window to be used in the event TCM-1 (Trajectory Correction
Manuever #1) was not performed as planned. The time allocated was
1:00 PM PDT, October 24 through 1:00 PM PST, October 26.
The flight sequence C3 C load will be uplinked to the spacecraft Sunday,
October 25. C3 C execution is at 1:00 PM, PST, October 26 and clocks out
for the remainder of the C3 timeline (November 17). C3 C lasts 21 days
and 20 hours and includes Mars Observer Camera Bakeout, Radio Science
Ultra Stable Oscillator testing, and Gamma Ray Spectrometer inner cruise
calibrations.
The Spacecraft Team reports that all Mars Observer subsystems continue
to perform well.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If God had wanted us to
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | have elections, he would
|_____|/ |_|/ |_____|/ | have given us candidates.
Article 2283 of sci.space.news:
Newsgroups: sci.space.news
Path: nntpd2.cxo.dec.com!nntpd.lkg.dec.com!news.crl.dec.com!deccrl!decwrl!ames!dont-send-mail-to-path-lines
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update #2 - 10/23/92
Message-ID: <1992Oct24.225759.17278@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
Keywords: Mars Observer, JPL
Sender: news@elroy.jpl.nasa.gov (Usenet)
Nntp-Posting-Host: kelvin.jpl.nasa.gov
Reply-To: baalke@kelvin.jpl.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Sat, 24 Oct 1992 12:56:23 GMT
Approved: sci-space-news@ames.arc.nasa.gov
Lines: 51
Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
October 23, 1992
The Mars Observer spacecraft is on the correct cruise
trajectory to Mars and all spacecraft subsystems are performing
well. Instrument payload and payload data checkouts are
continuing as planned.
The Magnetometer and Gamma Ray Spectrometer have been
successfully checked out. Testing of the Mars Balloon Relay
instrument took place on Sunday, Oct. 18, with excellent results.
The Mars Observer Camera underwent a focusing test on Oct. 20,
with similar results. Two other instruments, the Pressure
Modulator Infrared Radiometer and Thermal Emission Spectrometer,
also completed initial checkouts, and the Laser Altimeter was
checked out yesterday during a three-hour test. The first part
of this payload flight sequence will be completed tomorrow, Oct.
24.
Data from the Transfer Orbit Stage (TOS) was successfully
played back on the third attempt on Oct. 7, 1992. The Deep Space
Network reported that most of the TOS telemetry -- about one hour
and 16 minutes -- was recovered and recorded on the ground. A
preliminary review from the TOS program staff indicates that the
rocket motor and electrical systems performed well. A more
comprehensive evaluation is currently under way.
The spacecraft is scheduled to perform its second trajectory
correction maneuver, TCM-2, on Jan. 8, 1993.
Today the spacecraft is about 5 million miles (8 million
kilometers) from Earth, traveling at a speed of about 7,000 miles
per hour (11,000 kilometers per hour) relative to Earth. Its
velocity relative to the sun is about 73,000 miles per hour
(115,000 kilometers per hour).
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If God had wanted us to
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | have elections, he would
|_____|/ |_|/ |_____|/ | have given us candidates.
|
| 528.81 | Mars Observer Update 10/26/92 | CXDOCS::J_BUTLER | Annoy the media!! | Mon Oct 26 1992 20:17 | 62 |
| Article 2294 of sci.space.news:
Newsgroups: sci.space.news
Path: nntpd2.cxo.dec.com!pa.dec.com!decwrl!decwrl!ames!dont-send-mail-to-path-lines
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/26/92
Message-ID: <1992Oct26.193425.23191@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
Keywords: Mars Observer, JPL
Sender: news@elroy.jpl.nasa.gov (Usenet)
Nntp-Posting-Host: kelvin.jpl.nasa.gov
Reply-To: baalke@kelvin.jpl.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Tue, 27 Oct 1992 03:33:26 GMT
Approved: sci-space-news@ames.arc.nasa.gov
Lines: 43
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 26, 1992
11:00 AM PST
Launch +31 Days
Flight sequence C3 execution continues. The flight sequence C3 C load was
uplinked to the spacecraft yesterday, October 25. C3 C execution will
occur at 12:00 Noon, PST, today. C3 C lasts 21 days and 20 hours
(November 17) and includes Mars Observer Camera Bakeout, Radio Science
Ultra Stable Oscillator testing, and Gamma Ray Spectrometer inner cruise
calibrations. Today's activities generated by the stored sequence include
MOC heater power off at 1:00 PM, Payload Data System power on at 2:00
PM, and Magnetometer power on at 2:08 PM.
Friday's status report incorrectly stated that the Thermal Emissions
Spectrometer (TES) post-launch health had been checked in C3 A. Project
and Instrument teams had determined earlier that the TES checkout would
be deferred to execution of C4. This decision was based on the team's
concern that solar glint off of the Gamma Ray Spectrometer might
inadvertently damage the TES in C3 A. The planned short duration TES test
in C4 will provide indications of instrument health with minimal
associated risk to the instrument. Flight Enigineering Office and TES
Instrument teams are continuing to evaluate this situation.
The Project Manager received confirmation from the Mars Observer Laser
Altimeter Principal Investigator on the success of MOLA checkout
activities. Laser energy appeared nominal for the test duration and the
response to instrument temperature changes was as expected. The
sensitivity of the optical detector appeared to match prelaunch values,
and receiver thresholds and tracking algorithms also responded as
expected.
The Spacecraft Team reports that all Mars Observer subsystems continue
to perform well.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If God had wanted us to
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | have elections, he would
|_____|/ |_|/ |_____|/ | have given us candidates.
|
| 528.82 | Mars Observer Update 10/28/92 | PONIL::J_BUTLER | Annoy the media! | Wed Oct 28 1992 19:01 | 47 |
| Article 2308 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/28/92
Message-ID: <1992Oct28.194859.29136@news.arc.nasa.gov>
Followup-To: sci.space
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Keywords: Mars Observer, JPL
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Date: Thu, 29 Oct 1992 03:48:04 GMT
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 28, 1992
11:00 AM PST
Launch +33 Days
The new Battery Charge Management script was uplinked to the spacecraft
at 9:00 AM today, and the "start" command sent 1/2 hour later.
Verification of successful execution of the command has been received.
Flight Sequence C3 C continues executing. Magnetometer and Gamma Ray
Spectrometer instrument teams are receiving early cruise calibration
data.
The Spacecraft Team reports that all Mars Observer subsystems continue
to perform well.
The Ground Data System Office Manager reports that the GDS is performing
as expected: Uplink efficiency has been 100%; Downlink efficiency at 98% -
well within specifications.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If God had wanted us to
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | have elections, he would
|_____|/ |_|/ |_____|/ | have given us candidates.
|
| 528.83 | Mars Observer Update -- 10/29/92 | CXDOCS::J_BUTLER | Annoy the media!! | Fri Oct 30 1992 13:08 | 47 |
| Article 2314 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/29/92
Message-ID: <1992Oct29.222539.23360@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
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Organization: Jet Propulsion Laboratory
Date: Fri, 30 Oct 1992 06:24:59 GMT
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Fowarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 29, 1992
1:15 PM PST
Launch +34 Days
The new Battery Charge Management script completed its first cycle.
Verification of successful execution of the script has been received.
Flight Sequence C3 C continues executing toward its completion on
November 17. Magnetometer and Gamma Ray Spectrometer instrument
teams are receiving early cruise calibration data. The Mars Observer
Camera "bakeout" is continuing. Bakeout is the term used to describe the
process of powering on MOC heaters to dry up moisture which may have
collected within the camera's graphite epoxy composite tube while the
instrument was not in the vacuum of space. The required dryness is
critical to instrument focus.
The Spacecraft Team reports that all Mars Observer subsystems continue
to perform well.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If God had wanted us to
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | have elections, he would
|_____|/ |_|/ |_____|/ | have given us candidates.
|
| 528.84 | Mars Observer Updates 10/30/92 - 11/02/92 | CXDOCS::J_BUTLER | Annoy the media!! | Tue Nov 03 1992 14:18 | 88 |
| Article 2323 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 10/30/92
Message-ID: <1992Oct31.190316.1308@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
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Organization: Jet Propulsion Laboratory
Date: Sat, 31 Oct 1992 05:28:15 GMT
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
October 30, 1992
11:00 AM PST
Launch +35 Days
Flight Sequence C3 C continues executing toward its completion on
November 17. Magnetometer and Gamma Ray Spectrometer instrument
teams are receiving early cruise calibration data. The Mars Observer
Camera "bakeout" is continuing through December 26.
The Spacecraft Team reports that all Mars Observer subsystems continue
to perform well.
The C3 C timeline indicates that new spacecraft activities will be
relatively minimal over the next several days. However, this status will
be updated daily through completion of C3, or more frequently should
events dictate.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If God had wanted us to
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | have elections, he would
|_____|/ |_|/ |_____|/ | have given us candidates.
Article 2365 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 11/02/92
Message-ID: <1992Nov2.202505.8845@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
Keywords: Mars Observer, JPL
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Organization: Jet Propulsion Laboratory
Date: Tue, 3 Nov 1992 04:24:27 GMT
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Lines: 24
MARS OBSERVER STATUS REPORT
November 2, 1992
11:00 AM PST
Launch +38 Days
Flight Sequence C3 C continues executing toward its completion on
November 17. Magnetometer and Gamma Ray Spectrometer instrument
teams are receiving early cruise calibration data. The Mars Observer
Camera "bakeout" is continuing through December 26.
The Spacecraft Team reports that all Mars Observer subsystems continue
to perform well.
The C3 C timeline indicates that new spacecraft activities will be
relatively minimal over the next several days. However, this status will
be updated daily through completion of C3, or more frequently should
events dictate.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Give people a second
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | chance, but not a third.
|_____|/ |_|/ |_____|/ |
|
| 528.85 | Mars Observer Update 11/03/92 | PONIL::J_BUTLER | Annoy the media! | Tue Nov 03 1992 20:27 | 45 |
| Article 2370 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 11/03/92
Message-ID: <1992Nov3.210225.23765@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
Keywords: Mars Observer, JPL
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Organization: Jet Propulsion Laboratory
Date: Wed, 4 Nov 1992 05:01:51 GMT
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
November 3, 1992
12:30 PM PST
Launch +39 Days
Flight Sequence C3 C continues executing toward its completion on
November 17. Magnetometer and Gamma Ray Spectrometer instrument
teams are receiving early cruise calibration data. The Mars Observer
Camera "bakeout" is continuing through December 26.
The Spacecraft Team reports that all Mars Observer subsystems continue
to perform well.
The C3 C timeline indicates that new spacecraft activities will be
relatively minimal over the next several days. However, this status will
be updated daily through completion of C3, or more frequently should
events dictate.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Give people a second
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | chance, but not a third.
|_____|/ |_|/ |_____|/ |
|
| 528.86 | Mars Observer Update 11/04/92 | PONIL::J_BUTLER | E poi, si muove... | Wed Nov 04 1992 18:29 | 45 |
| Article 2372 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 11/04/92
Message-ID: <1992Nov4.190206.11711@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
Keywords: Mars Observer, JPL
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Organization: Jet Propulsion Laboratory
Date: Thu, 5 Nov 1992 03:01:16 GMT
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Lines: 26
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
November 4, 1992
11:00 AM PST
Launch +40 Days
Flight Sequence C3 C continues executing toward its completion on
November 17. Magnetometer and Gamma Ray Spectrometer instrument
teams are receiving early cruise calibration data. The Mars Observer
Camera "bakeout" is continuing through December 26.
The Spacecraft Team reports that all Mars Observer subsystems continue
to perform well.
A Flight Software modification proposal review is taking place today at
JPL. The advisability and effectiveness of implementing minor changes is
being reviewed by Project Management and flight software experts from
both JPL and Contractor organizations.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Give people a second
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | chance, but not a third.
|_____|/ |_|/ |_____|/ |
|
| 528.87 | Mars Observer Update 11/06/92 | TINCUP::J_BUTLER | E pur, si muove... | Mon Nov 09 1992 18:57 | 55 |
| Article 2417 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 11/06/92
Message-ID: <1992Nov8.040355.4499@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
Keywords: Mars Observer, JPL
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Organization: Jet Propulsion Laboratory
Date: Sun, 8 Nov 1992 12:03:11 GMT
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Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
November 6, 1992
The Mars Observer spacecraft team reports that all
spacecraft subsystems continue to perform well. Instrument
payload and payload data checkouts are continuing as planned.
The instrument calibration flight sequence currently under
way will continue through Nov. 17, 1992. The Magnetometer and
Gamma Ray Spectrometer instrument teams are receiving early
cruise calibration data. The Mars Observer Camera "bakeout" to
prepare the camera for operation will continue through Dec. 26,
1992. New spacecraft activities are expected to be minimal over
the next several days.
Today the spacecraft is about 12 million kilometers (7.5
million miles) from Earth, traveling at a speed of about 11,800
kilometers per hour (7,500 miles per hour) relative to Earth.
The spacecraft is traveling at a heliocentric velocity of about
111,000 kilometers per hour (72,000 miles per hour).
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Give people a second
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | chance, but not a third.
|_____|/ |_|/ |_____|/ |
|
| 528.88 | Mars Observer Update 11/09/92 | PONIL::J_BUTLER | E pur, si muove... | Tue Nov 10 1992 13:01 | 53 |
| Article 2422 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 11/09/92
Message-ID: <1992Nov9.203203.5427@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
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Organization: Jet Propulsion Laboratory
Date: Tue, 10 Nov 1992 04:31:18 GMT
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MARS OBSERVER STATUS REPORT
November 9, 1992
11:00 AM PST
Launch +45 Days
Flight Sequence C3 C continues executing toward its completion on
November 17. Magnetometer and Gamma Ray Spectrometer instrument
teams are receiving early cruise calibration data. The Mars Observer
Camera "bakeout" is continuing through December 28.
The Spacecraft Team reports that all Mars Observer subsystems continue
to perform well.
Flight Sequence C4 final approval will take place this week. Uplink of C4
will take place 11/16, with execution to be begin after completion of C3 C
on November 17.
Work is underway to modify Flight Sequences C6, C7 and C8. TCM 2 (Trajectory
Correction Maneuver #2) is being removed from C6 and placed in C7 for
execution on February 8. TCM 3 is being moved from C7 to C8 for execution on
March 18. These maneuvers are being moved out in time to accommodate Flight
Software Modification activities which must precede them. Magnetometer
calibrations, earlier planned for inclusion in C7, will be included in C8.
The C3 C timeline indicates that new spacecraft activities will be
relatively minimal over the next several days. Unless circumstances
warrant, this status will be updated on Friday, 11/13.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Give people a second
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | chance, but not a third.
|_____|/ |_|/ |_____|/ |
|
| 528.89 | Mars Observer Updates 11/12-13-16/92 | PONIL::J_BUTLER | E pur, si muove... | Tue Nov 17 1992 13:45 | 169 |
| Article 2444 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 11/12/92
Message-ID: <1992Nov12.230528.10203@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
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Organization: Jet Propulsion Laboratory
Date: Fri, 13 Nov 1992 07:04:50 GMT
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
November 12, 1992
11:00 AM PST
Launch +48 Days
Flight Sequence C3 C continues executing toward its completion on
November 17. Magnetometer and Gamma Ray Spectrometer instrument
teams are receiving early cruise calibration data. The Mars Observer
Camera "bakeout" is continuing through December 28.
The Spacecraft Team reports that all Mars Observer subsystems continue
to perform well.
The Gamma Ray Spectrometer experienced a Single Event Upset Tuesday.
The SEU caused the instrument to switch out of GRS random access
memory operation and reset to programmable read only memory. Analysis
indicates no problems with the memory load, and a command to switch
back to random access memory operation has been approved for radiation
this evening.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Give people a second
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | chance, but not a third.
|_____|/ |_|/ |_____|/ |
Article 2452 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 11/13/92
Message-ID: <1992Nov13.192046.22718@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
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Organization: Jet Propulsion Laboratory
Date: Sat, 14 Nov 1992 02:49:36 GMT
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Lines: 42
MARS OBSERVER STATUS REPORT
November 13, 1992
11:00 AM PST
Launch +49 Days
Flight Sequence C3 C continues executing toward its completion on
November 17. Magnetometer and Gamma Ray Spectrometer instrument
teams are receiving early cruise calibration data. The Mars Observer
Camera "bakeout" is continuing through December 28.
A new Star Catalog/Ephemeris was uplinked and a successful "USE"
command radiated this morning. The ephemeris previously used had the
intended effect of altering the solar array sun incidence angle by 5
degrees, from 60 degrees to 55 degrees. This sun incidence angle periodic
decrease will be performed in subsequent ephemeris loads, with the final
objective being to point the high-gain antenna at earth by the time
transition from inner to outer cruise takes place. The current offset is
designed to prevent direct sunlight on the solar panels creating an excess
amount of power. At the time of transition from inner to outer cruise, the
spacecraft will be of sufficient distance from the sun that excess power
is of a lesser concern.
Uplink of the C4 sequence is planned for November 16. C4 will begin
execution at 8:00 AM, PST, upon completion of C3 C. C4 is 28 days in
duration and continues the MOC bakeout, performs Radio Science Ultra
Stable Oscillator tests, Modulation Index Test, Radio Frequency Subsystem
Automatic Gain Control and Command Data Unit Signal to Noise Ratio
tests, and a Static Phase Error test.
The Spacecraft Team reports that all Mars Observer subsystems continue
to perform well.
Today, the spacecraft is 8,793,376 miles from earth, traveling at a
velocity of 8,106 miles per hour. One way light time is approximately 47
seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Give people a second
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | chance, but not a third.
|_____|/ |_|/ |_____|/ |
Article 2469 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 11/16/92
Message-ID: <1992Nov16.211136.12006@news.arc.nasa.gov>
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.3-4
Keywords: Mars Observer, JPL
Sender: news@elroy.jpl.nasa.gov (Usenet)
Nntp-Posting-Host: kelvin.jpl.nasa.gov
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Organization: Jet Propulsion Laboratory
Date: Tue, 17 Nov 1992 05:10:56 GMT
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
November 16, 1992
11:00 AM PST
Launch +52 Days
Flight sequence C3 C completes tomorrow morning just prior to 8:00 A.M.
PST. Magnetometer and Gamma Ray Spectrometer instrument teams have
been receiving early cruise calibration data. The Mars Observer Camera
"bakeout" which was initiated in C3 C will continue through December 28.
The C4 sequence uplink took place this morning. C4 will begin execution at
8:00 AM tomorrow upon completion of C3 C. C4 is 28 days in duration and
continues the MOC bakeout, performs Radio Science Ultra Stable Oscillator
tests, Modulation Index Test, Radio Frequency Subsystem Automatic Gain
Control and Command Data Unit Signal to Noise Ratio tests, and a Static
Phase Error test.
Since launch, the spacecraft has experienced 18 Single Event Upsets
causing memory bit errors. Fifteen errors occurred in the Standard
Controls Processor (SCP) and 3 in the Engineering Data Formatter (EDF). On
Saturday, November 14, a one-word Flight Software patch was uplinked to
the spacecraft to correct an error in the algorithm which identifies and
corrects memory bit errors. Indications are that the problem has been
resolved.
The Spacecraft Team reports that all Mars Observer subsystems continue
to perform well.
Today the spacecraft is 15,072,451 km (9,365,587 miles) from earth,
traveling at a velocity of 3.8144 kilometers per second (8,106 miles per
hour). One way light time is approximately 50 seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Learn to recognize the
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | inconsequential, then
|_____|/ |_|/ |_____|/ | ignore it.
|
| 528.90 | Definite increase in technobabble detected in Mars Observer project. | PRAGMA::GRIFFIN | Dave Griffin | Tue Nov 17 1992 16:00 | 4 |
| Ah. We no longer "send" commands to the probe -- we "radiate" them.
- dave
|
| 528.91 | Now "Radiating" Mars Obs Update for 11/17/92 | PONIL::J_BUTLER | E pur, si muove... | Tue Nov 17 1992 19:25 | 54 |
| Article 2472 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 11/17/92
Message-ID: <1992Nov17.200545.23178@news.arc.nasa.gov>
Followup-To: sci.space
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Organization: Jet Propulsion Laboratory
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
November 17, 1992
11:00 AM PST
Launch +53 Days
Flight sequence C4 execution began at 8:00 AM today. C4 is 28 days in
duration and continues the MOC (Mars Observer Camera) bakeout, performs
Radio Science Ultra Stable Oscillator tests, Modulation Index Test, Radio
Frequency Subsystem Automatic Gain Control and Command Data Unit Signal
to Noise Ratio tests, and a Static Phase Error test. C4 also performs a
brief Thermal Emissions Spectrometer (TES) checkout.
The software for Payload Data System operation from random access
memory (RAM) is being uploaded this morning. PDS RAM operation will be
commanded after verification of successful upload. The PDS had operated
from programmable read-only memory (PROM) for late C3 Gamma Ray
Spectrometer and Magnetometer calibration activities. However, the TES
test in C4 requires that the PDS operates from RAM to afford maximum
protection to the TES instrument.
The Spacecraft Team reports that all Mars Observer subsystems continue
to perform well.
Today the spacecraft is 15,389,285 KM (9,562,458 miles) from earth,
traveling at a velocity of 3.8857 kilometers per second (8,692 miles per
hour). One way light time is approximately 51 seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Learn to recognize the
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | inconsequential, then
|_____|/ |_|/ |_____|/ | ignore it.
|
| 528.92 | Mars Observer Update 11/18/92 | TINCUP::J_BUTLER | E pur, si muove... | Thu Nov 19 1992 12:55 | 61 |
| Article 2477 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 11/18/92
Message-ID: <1992Nov19.015509.15382@news.arc.nasa.gov>
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Organization: Jet Propulsion Laboratory
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
November 18, 1992
11:00 AM PST
Launch +54 Days
Flight sequence C4 is active. The sequence performed Modulation Index
testing this morning at the 2000 bps engineering data rate. On completion,
the data rate was switched to 4000 bps in preparation for Thermal Emission
Spectrometer checkout and calibration activities which followed. The TES
checkout had been moved to C4 from C3 and was relatively brief - 80
seconds- in duration. A non-stored command was sent to power off the
TES after the test at the request of the TES instrument team. This was
done to insure that the instrument was powered off as soon as possible
after testing.
At 3:00 A.M. PST this morning a star/ephemiris upload took place. The
current ephemeris results in a planned 5 degree decrease in sun incidence
angle, from 55 degrees to 50 degrees. These periodic reductions will be
performed until such time as the HGA (High Gain Antenna) is pointed directly
at Earth (January 1993).
At Noon PST today, telemetry transmission was commanded back to the 2000 bps
rate. The Payload Data System was powered off shortly thereafter.
The NASA Quarterly Review was conducted yesterday and today by video
conference between JPL and NASA Headquarters in Washington, D.C.
The Spacecraft Team reports that all Mars Observer subsystems continue
to perform well.
Today the spacecraft is 15,711,663 km (9,762,775 miles) from earth,
traveling at a velocity of 3.9608 kilometers per second (8,860 miles per
hour). One way light time is approximately 52 seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Learn to recognize the
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | inconsequential, then
|_____|/ |_|/ |_____|/ | ignore it.
|
| 528.93 | Mars Observer Updates: 11/20,23,24,25/92 | PONIL::J_BUTLER | E pur, si muove... | Mon Nov 30 1992 12:34 | 187 |
| Article 2499 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 11/20/92
Message-ID: <1992Nov20.232926.28536@news.arc.nasa.gov>
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Organization: Jet Propulsion Laboratory
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PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
November 20, 1992
All spacecraft subsystems are performing well.
A new flight sequence, primarily dedicated to radio science
activities, began on Nov. 17 and will continue through Dec. 14.
Checkout of the Thermal Emission Spectrometer and completion of
the Laser Altimeter checkout were performed last week. The Mars
Observer Camera "bakeout" to prepare the instrument for operation
continues through Dec. 28.
The second trajectory correction maneuver (TCM-2) has been
rescheduled for Feb. 8, 1993, to allow engineers time to upgrade
on-board flight software. TCM-3 has also been rescheduled for
March 8, 1993.
Until now, the spacecraft's solar panels have been oriented
at a 60-degree sun incidence angle to prevent excess power caused
by the solar array's direct exposure to the sun. A star-
ephemiris table was uploaded on Nov. 17, decreasing the sun
incidence angle by 5 degrees. These periodic changes will occur
about once a week through Jan. 2, 1993, and will cause the
spacecraft's high-gain antenna to point directly at Earth.
Today the spacecraft is about 16 million kilometers (10
million miles) from Earth, traveling at a speed of about 14,500
kilometers per hour (9,000 miles per hour) relative to Earth.
The spacecraft is traveling at a heliocentric velocity of about
111,500 kilometers per hour (70,000 miles per hour).
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Learn to recognize the
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | inconsequential, then
|_____|/ |_|/ |_____|/ | ignore it.
{header deleted - JB}
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT #2
November 20, 1992
11:00 AM PST
Launch +56 Days
Flight sequence C4 is active through December 14. While the MOC
(Mars Observer Camera) "bakeout" is continuing through December 28,
the remainder of the C4 sequence is primarily dedicated to radio
science activities. As reported earlier this week, Thermal Emissions
Spectrometer and Mars Observer Laser Altimeter checkouts performed in
early C4 execution were successful.
The Spacecraft Team reports that all Mars Observer subsystems continue
to perform well.
Today the spacecraft is 16,374,527 km (10,174,659 miles) from Earth,
traveling at a velocity of 4.1220 kilometers per second (9,220 miles per
hour) with respect to Earth. One way light time is approximately 55
seconds.
{footer, sig, and header deleted - JB}
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
November 23, 1992
11:00 AM PST
Launch +59 Days
Sequence C4 remains active and without anomaly. The static phase
error test was completed last week which verified the DSN (Deep
Space Network) uplink frequency margins with the spacecraft. The
MAG (Magnetometer) and the GRS (Gamma Ray Spectrometer) remain
powered ON during the sequence, but are quiescent. The MOC (Mars
Observer Camera) bakeout continues to perform nominally. A delta
DOR (Differenced One-way Ranging) was performed over the weekend,
as a planned weekly event.
A Command Detector Test is planned to be uplinked Tuesday to
verify the capability to command the spacecraft at a 500 bps uplink
rate.
The spacecraft is now in engineering mode at 2000 bps downlink
with 1 tracking pass per day. The Spacecraft and science teams
report that all subsystems and payload instruments are performing
very well.
{footer, sig, and header deleted - JB}
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
November 24, 1992
11:00 PST
Launch +60 Days
Sequence C4 remains active on board the spacecraft and is continuing without
anomaly. The Magnetometer and the Gamma Ray Spectrometer remain
powered ON during this sequence, primarily to maintain proper thermal
environments. The Mars Observer Camera continues its bakeout activity and
is performing as expected.
A command test was completed earlier today, commanding the spacecraft
Command Detector Units to 500 bits per second and sending several command
files. These files were designed to demonstrate the capability of the
spacecraft to receive 500 bit per second single commands and multiple element
commands. Although several ground system problems, related to a Command
Processing Assembly, occured at the DSN (Deep Space Network) station during
the command period, sufficient command files were successfully radiated to
and received by the spacecraft to demonstrate the high command rate
capability.
New star and spacecraft ephemeris files are planned to be radiated tomorrow,
without adjusting the inertial attitude of the spacecraft.
The spacecraft remains in engineering mode at 2000 bits per second downlink
with 1 tracking pass per day while in inner cruise. The spacecraft and science
teams both report that all subsystems and payload instruments are performing
quite acceptably.
{footer, sig, and header deleted - JB}
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
November 25, 1992
11:00 PST
Launch +61 Days
Sequence C4 remains active on the spacecraft and is continuing without anomaly.
The spacecraft was commanded to Mission Mode at 250 bits per second downlink
rate at 1700 hours UTC. This was a planned activity within the stored sequence
and was necessary because of telecommunication link performance roll off due to
increased earth-to-spacecraft range. A new star catalog file, sun pointing
target and spacecraft ephemeris file were successfully loaded onto the
spacecraft today and activated.
No further command activity is planned over the Thanksgiving holiday period
with the exception of the standard delta DOR (Differential One-way Ranging)
scheduled for Saturday, November 28th.
The Magnetometer and the GRS (Gamma Ray Spectrometer) remain powered ON and the
Mars Observer Camera bakeout continues nominally. The Pressure Modulator I
nfrared Radiometer has had its auxilliary electronics assembly heater turned ON
for the remainder of the cruise phase for thermal balance considerations.
The spacecraft will remain at the 250 bit per second downlink rate throughout
the remainder of the inner cruise phase, which continues until early January,
1993. The Spacecraft and Science teams both report that all subsystems and
payload instruments continue to perform as expected.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Learn to recognize the
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | inconsequential, then
|_____|/ |_|/ |_____|/ | ignore it.
|
| 528.94 | Mars Observer Update -- 11/30/92 | PONIL::J_BUTLER | E pur, si muove... | Tue Dec 01 1992 13:18 | 55 |
| Article 2544 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 11/30/92
Message-ID: <1992Nov30.220015.25070@news.arc.nasa.gov>
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
November 30, 1992
12:30 AM PST
Launch +66 Days
Flight sequence C4 is active through December 14. The Mars Observer
Camera bakeout continues through December 28. The Gamma Ray
Spectrometer and Magnetometer instruments are powered on, but are in a
quiescent state. No spacecraft or instrument commanding is planned for
today.
Magnetometer/Electron Reflectometer Geotail experiment command files
are in the development, approval and generation process in anticipation of
planned uplink and execution on December 9 through 13.
A Star Catalog/Ephemeris uplink is planned for Wednesday, December 2.
The new ephemeris will affect spacecraft attitude to provide optimal low
gain antenna Earth pointing while keeping the solar array at the desired
sun incidence angle.
The Spacecraft and Instrument Teams report that all Mars Observer
subsystems and instruments continue to perform well.
Today the spacecraft is 20,145,674 km (12,517,941 miles) from Earth,
traveling at a velocity of 5.1265 kilometers per second (11,467 miles per
hour) with respect to Earth. One way light time is approximately 67
seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Learn to recognize the
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | inconsequential, then
|_____|/ |_|/ |_____|/ | ignore it.
|
| 528.95 | Mars Observer Updates 12/02/92 and 12/04/92 | PONIL::J_BUTLER | E pur, si muove... | Mon Dec 07 1992 16:00 | 121 |
| Article 2557 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 12/02/92
Message-ID: <1992Dec2.184908.26460@news.arc.nasa.gov>
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
December 2, 1992
11:00 AM PST
Launch +68 Days
Flight sequence C4 remains active through December 14. The Mars
Observer Camera bakeout is continuing through December 28. The Gamma
Ray Spectrometer and Magnetometer instruments are powered on, but are
in a quiescent state.
Verification of successful commanding has been received for the Star
Catalog/Ephemeris uplink and activation which took place this morning.
The new ephemeris will affect spacecraft attitude to provide optimal low
gain antenna Earth pointing while keeping the solar array at a desired sun
incidence angle.
Magnetometer and Electron Reflectometer Geotail experiment command
files are in the development, approval and generation process in
anticipation of planned uplink and execution on December 8 through 14.
The Geotail experiment will take place in the period December 8 through
12. Commanding will be performed to configure the spacecraft as required
for the experiment and to reconfigure back to normal cruise configuration
upon completion of Geotail measurement activities.
The Spacecraft and Instrument Teams report that all Mars Observer
subsystems and instruments continue to perform well.
Today the spacecraft is 21,010,679 km (13,055,430 miles) from Earth,
traveling at a velocity of 5.3618 kilometers per second (11,994 miles per
hour) with respect to Earth. One way light time is approximately 70
seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The 3 things that children
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | find the most fascinating:
|_____|/ |_|/ |_____|/ | space, dinosaurs and ghosts.
Article 2566 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 12/04/92
Message-ID: <1992Dec4.182747.22323@news.arc.nasa.gov>
Followup-To: sci.space
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Date: Sat, 5 Dec 1992 02:26:05 GMT
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
December 4, 1992
10:00 AM PST
Launch +70 Days
Flight sequence C4 remains active through December 14. The Mars
Observer Camera bakeout is continuing through December 28. The Gamma
Ray Spectrometer and Magnetometer instruments are powered on, but are
in a quiescent state. The spacecraft is transmitting in the Mission Mode at
a data rate of 250 bits per second. It will remain at this rate/mode until
High Gain Antenna activation, currently planned for January 4, 1993.
Today marks ten weeks since launch. The Mars Observer Spacecraft and
Instrument Teams report that all spacecraft subsystems and instruments
are performing nominally.
In-flight activities this week were minimal. The primary activity was
uplink and activation on Tuesday of a new Star Catalog/Ephemeris which
affected spacecraft attitude to provide optimal low gain antenna Earth
pointing while keeping the solar array at a desired sun incidence angle to
protect against excessive electrical power build-up.
Command files for the recently proposed Magnetometer and Electron
Reflectometer Geotail experiment are in the development, approval, and
generation process in anticipation of the 8 - 12 December Geotail
measurement opportunity.
A "Power-In" maneuver Preliminary Design Review will be held Friday, 11
December.
As of today, the spacecraft is 21,918,495 km (13,619,521 miles) from
Earth, traveling at a velocity of 5.6069 kilometers per second (12,542
miles per hour) with respect to Earth. One way light time is approximately
73 seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The 3 things that children
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | find the most fascinating:
|_____|/ |_|/ |_____|/ | space, dinosaurs and ghosts.
|
| 528.96 | Mars Observer Update -- 12/07/92 | PONIL::J_BUTLER | E pur, si muove... | Tue Dec 08 1992 15:52 | 44 |
| Article 2580 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 12/07/92
Message-ID: <1992Dec7.221410.23763@news.arc.nasa.gov>
Followup-To: sci.space
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Date: Tue, 8 Dec 1992 06:12:28 GMT
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
December 7, 1992
1:00 PM PST
Launch +73 Days
Flight sequence C4 remains active through December 14. The Mars
Observer Camera bakeout is continuing through December 28.
Command files for the recently proposed Magnetometer and Electron
Reflectometer Geotail experiment have been prepared. They will be
uplinked and executed in three loads on the 9th, 11th and 14th of
December. The Gamma Ray Spectrometer team will also be receiving data
during Geotail measurement activities.
A "Power-In" maneuver Preliminary Design Review will be held Friday, 11
December.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The 3 things that children
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | find the most fascinating:
|_____|/ |_|/ |_____|/ | space, dinosaurs and ghosts.
|
| 528.97 | Mars Observer Update -- 12/09/92 | PONIL::J_BUTLER | E pur, si muove... | Thu Dec 10 1992 19:07 | 52 |
| Article 2629 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 12/09/92
Message-ID: <1992Dec9.172324.23088@news.arc.nasa.gov>
Followup-To: sci.space
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Date: Thu, 10 Dec 1992 01:21:48 GMT
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
December 9, 1992
5:30 AM PST
Launch +75 Days
The first of three sets of commands to perform Geotail
measurement activities will be sent today. The Magnetometer and
Electron Reflectometer, and Gamma Ray Spectrometer instruments
will be taking data. Commanding performed earlier left MAG and
GRS powered on but in quiescent states.
Commanding today will power on the ER, Payload Data System, and
Digital Tape Recorder 1, and activate GRS operation from its
random access memory.
Commanding on Friday, December 11, will power off DTR1, and power
on DTR3, which will continue recording through the end of Geotail
measurements.
On Monday, December 14, ER and PDS will be commanded off. MAG and
GRS will remain powered on but quiescent.
Activities to "clean up" tape recorders will begin 2 weeks after
completion of Geotail measurement.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The 3 things that children
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | find the most fascinating:
|_____|/ |_|/ |_____|/ | space, dinosaurs and ghosts.
|
| 528.98 | Mars Observer Updates 1 & 2 for 12/11/92 | PONIL::J_BUTLER | E pur, si muove... | Fri Dec 11 1992 19:59 | 126 |
| Article 2655 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 12/11/92
Message-ID: <1992Dec11.185938.18674@news.arc.nasa.gov>
Followup-To: sci.space
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Organization: Jet Propulsion Laboratory
Date: Sat, 12 Dec 1992 02:57:36 GMT
Approved: sci-space-news@ames.arc.nasa.gov
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Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
December 11, 1992
All spacecraft subsystems are performing well.
The radio science flight sequence is winding down and
scheduled for completion on Dec. 14, 1992. The next flight
sequence will prepare the spacecraft for its transition to the
outer cruise flight mode in which the high-gain antenna rather
than the low-gain antenna will be used. The outer cruise
attitude transition begins on Dec. 15, 1992. The Mars Observer
camera "bakeout" to prepare the instrument for operation will
continue in this next sequence through Dec. 28, 1992.
A science experiment to observe Earth's geotail at a greater
distance than has been performed by other spacecraft started on
Dec. 9, 1992. The geotail is the region of space in which the
solar wind is disturbed as Earth moves in its orbit around the
sun. The experiment will use Mars Observer's magnetometer and
electron reflectometer to gather data on solar and magnetic
particle disruption in this region.
Star-ephemiris tables, uploaded about once a week, continue
to adjust the spacecraft's solar panels so that they are
beginning to point more directly at the sun and the high-gain
antenna is pointing more directly at Earth. These adjustments
are planned to continue through Jan. 2, 1993, when the high-gain
antenna is pointing directly at Earth.
Today the spacecraft is about 25 million kilometers (16
million miles) from Earth, traveling at a speed of about 23,500
kilometers per hour (15,000 miles per hour) relative to Earth.
The spacecraft is traveling at a heliocentric velocity of about
105,000 kilometers per hour (66,000 miles per hour).
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The 3 things that children
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | find the most fascinating:
|_____|/ |_|/ |_____|/ | space, dinosaurs and ghosts.
Article 2657 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update #2 - 12/11/92
Message-ID: <1992Dec11.211300.20880@news.arc.nasa.gov>
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
December 11, 1992
1:00 PM PST
Launch +77 Days
The Spacecraft and Instrument Teams report that all Mars Observer
subsystems and instruments continue to perform well. Flight sequence C4
remains active through December 18. The Mars Observer Camera bakeout is
continuing through December 28.
The first set of commands to perform Geotail measurement activities was
sent December 9. The Electron Reflectometer, Payload Data System, and
Digital Tape Recorder 1 were powered on. The Magnetometer and Gamma
Ray Spectrometer had previously been powered on but quiescent.
Commands were sent today to power off DTR 1 and power on DTR3, which
will continue recording though the end of Geotail measurements.
Commanding will be performed to power off the Electron Reflectometer
and Payload Data Systems on December 14.
The Preliminary Design Review of the "Power-In" maneuver working
group's recommendation was held today at JPL. Project Management,
Science, and Flight Team representatives participated.
Today the spacecraft is 25,462,777 km (15,821,836 miles) from Earth,
traveling at a velocity of 6.5314 kilometers per second (14,610 miles per
hour) with respect to Earth. One way light time is approximately 85
seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The 3 things that children
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | find the most fascinating:
|_____|/ |_|/ |_____|/ | space, dinosaurs and ghosts.
|
| 528.99 | Mars Observer Update 12/14/92 | PONIL::J_BUTLER | E pur, si muove... | Tue Dec 15 1992 14:10 | 67 |
| Article 2667 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 12/14/92
Message-ID: <1992Dec14.181201.12701@news.arc.nasa.gov>
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
December 14, 1992
9:00 AM PST
Launch +80 Days
The Spacecraft continues to perform well in its Inner Cruise configuration
with downlink communications at 250 bps and uplink at 125 bps utilizing
the low gain antenna array. Flight sequence C4 continues to clock out
through December 18.
The Electron Reflectometer and Payload Data Systems will be powered off
today. Geotail measurement data taken by the Magnetometer/Electron
Reflectometer has been recorded on Digital Tape Recorders 1 and 3. The
data recorded during Geotail measurement will be replayed during the C6
sequence in late January, after High Gain Antenna communications have
been established and higher playback data rates can be supported.
Over the course of last week, Standard Control Processor 1 experienced 3
Single-Event Upsets. This is only slightly higher than the predicted rate
and is not considered a cause for concern by the spacecraft team. The
Attitude, Articulation and Control Subsystem (AACS) experienced an unusually
large number of unidentified star transits during the transition to the new
star catalog for the second week in a row last week. AACS engineers
believe the problem to be related to gyro scale factor growth during the
large star catalog/ephemeris-induced spacecraft attitude transitions in
preparation for transition to Outer Cruise configurations and operations.
Using this hypothesis, Spacecraft Team members have been successful in
replicating this phenomenon on the Verification Test Laboratory
spacecraft testbed and are planning command changes in the next star
catalog/ephemiris loads to insure that the spacecraft retains its internal
reference for star identification.
The Flight Software Version 7 Final Design Review is being held today at
JPL.
Today, the spacecraft is 27,169,270 km (16,882,201 miles) from Earth,
traveling at a velocity of 6.9548 kilometers per second (15,557 miles per
hour) with respect to Earth. One way light time is approximately 91
seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The 3 things that children
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | find the most fascinating:
|_____|/ |_|/ |_____|/ | space, dinosaurs and ghosts.
|
| 528.100 | MO Update 12/16/92 (Loss of Inertial Ref Reported) | PONIL::J_BUTLER | E pur, si muove... | Thu Dec 17 1992 17:36 | 58 |
| Article 2693 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 12/16/92
Message-ID: <1992Dec17.003657.28526@news.arc.nasa.gov>
Followup-To: sci.space
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Forwarded from the Mars Observer Project.
MARS OBSERVER STATUS REPORT
December 16, 1992
4:00 PM PST
Launch +82 Days
The Spacecraft Team reported that a loss of inertial reference caused the
spacecraft to enter Sun Comm Power at about 10:45 A.M. PDT this morning.
On-board systems initiated automatic transition to this state when the
Celestial Sensor Assembly's misidentified star threshold was exceeded.
This occurred on the second spacecraft revolution after a "Use" command
was sent to utilize the "Insertion+82 Star Catalog/Ephemeris" uploaded
this morning.
Engineers have verified that the spacecraft is safe and stable after
performing properly in making the change from Array Normal Spin.
Attitude, Articulation, and Control subsystem staff believe they
understand the problem and plan to command the spacecraft at 6:00 P.M.
PST this evening and again tomorrow morning (12/17) at 6:00 A.M. PST to
return to Array Normal Spin.
This evening's command will place the spacecraft in Sun Star Init state to
affect the desired return to inertial reference. The spacecraft will remain
in this state until the desired return to inertial reference can be verified
and AACS engineering data can be closely studied.
The spacecraft will be commanded back to Array Normal Spin at 6:00 A.M.
Thursday. After ANS is verified and star identification has been
reestablished, the command will be sent to enable nominal momentum
unloading. At this point the spacecraft will have been returned to the
nominal configuration for completion of the mission inner cruise phase.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Choose a job you love, and
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you'll never have to work
|_____|/ |_|/ |_____|/ | a day in you life.
|
| 528.101 | Mars Observer Update 12/17/92 | PONIL::J_BUTLER | E pur, si muove... | Mon Dec 21 1992 16:30 | 52 |
| Article 2698 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 12/17/92
Message-ID: <1992Dec17.205504.26414@news.arc.nasa.gov>
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
December 17, 1992
9:00 AM PST
Launch +83 Days
The spacecraft was successfully commanded back to Array Normal Spin (ANS)
state at 6:08 A.M. this morning. After ANS and star identification were
verified, the command was sent at 6:58 to enable Momentum Unloading
flight software. After a short warmup period, a small momentum
unloading occurred.
Engineers have reported that the spacecraft is stable and nominally
processing stars for inertial reference. Attitude, Articulation, and Control
subsystem engineers understand the events leading to yesterday's loss of
inertial reference problem and are implementing plans to avoid
reoccurrence.
Activities are underway to upload the C5 sequence on Friday, December
18th for execution beginning on the 19th. C5 is the stored sequence that
performs tasks to prepare the spacecraft for transition to the Outer
Cruise phase of the mission.
The Mars Observer Ground Data System Encounter/Mapping Critical Design
Review is taking place today at JPL.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Choose a job you love, and
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you'll never have to work
|_____|/ |_|/ |_____|/ | a day in you life.
|
| 528.102 | Mars Observer Update 12/18/92 | PONIL::J_BUTLER | E pur, si muove... | Mon Dec 21 1992 16:31 | 49 |
| Article 2707 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 12/18/92
Message-ID: <1992Dec18.223504.4155@news.arc.nasa.gov>
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
December 18, 1992
1:30 PM PST
Launch +84 Days
An unscheduled outage at DSS-15 (Goldstone 34 meter antenna) necessitated
"real time" replanning for the upload of Flight Sequence C5 last evening.
Flight Operations Office Mission Control Team members were able to secure
coverage through DSS-45 (Canberra 34 meter antenna) and successfully
completed C5 and "No Op" loads.
C4 execution completes tomorrow, December 19; C5 execution begins on
completion of C4. C5 is the outer cruise transition sequence which is
marked by the spacecraft attitude being changed from an off sun
orientation to direct pointing at Earth. The planned C5 execution
completion date is January 4, 1993.
Today the spacecraft is 29,630,134 km (18,411,311 miles) from Earth,
traveling at a velocity of 7.5405 kilometers per second (16,868 miles per
hour) with respect to Earth. One way light time is approximately 99
seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Choose a job you love, and
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you'll never have to work
|_____|/ |_|/ |_____|/ | a day in you life.
|
| 528.103 | Mars Observer Updates 12/21 & 22/92 | PONIL::J_BUTLER | E pur, si muove... | Mon Dec 28 1992 20:13 | 105 |
| Article 2742 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 12/21/92
Message-ID: <1992Dec28.071228.14642@news.arc.nasa.gov>
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
December 21, 1992
The spacecraft continues to clock out the C5 sequence. The low gain
antennas are still being used for uplink and downlink communications.
The digital tape recorders are being repacked today in sequential order
to remove any flight vibration affects and to accomplish regular
manufacturer's recommendations for tape maintenance.
The spacecraft again entered Sun Comm Power mode over the weekend.
It is believed now that an algorithm in the star processing software is
exhibiting convergence prematurely due to sightings of multiple stars.
The Spacecraft team is in the process of recovering to the Array Normal
Spin mode of operation, during which time the star processing algorithm
will be adjusted to allow the spacecraft to remain in Array Normal Spin
with more tolerance to sighting of multiple stars. All spacecraft and
payload temperatures are stable while in this temporary attitude of
off-sun pointing. Command files are being generated to return the
spacecraft to normal operations Tuesday morning. The spacecraft
remains in a stable and safe configuration in the Sun Star Init mode
while the flight team prepares the required commands for transitioning to
ANS.
The spacecraft engineering and science payload elements are functioning
properly and within expected performance ranges.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Choose a job you love, and
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you'll never have to work
|_____|/ |_|/ |_____|/ | a day in your life.
Article 2746 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 12/22/92
Message-ID: <1992Dec28.073029.16386@news.arc.nasa.gov>
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
December 22, 1992
The C5A sequence continues to clock out and the C5B
sequence is being readied for early January uplink, pending
final confirmation of the date for transition to outer cruise
attitude.
The SCT has successfully loaded the I + 89 star catalogs and
ephemeris updates and the spacecraft is collecting stars while
in the Sun Star Init mode. The spacecraft will be commanded
back to the Array Normal Spin mode this afternoon.
The spacecraft is expected to be placed in the outer cruise
configuration in early January, which positions the spacecraft
HGA (High Gain Antenna) and solar array towards earth. Following
transition to outer cruise, the HGA will be activated. Following a
short calibration period, the HGA will then be utilized throughout
the rest of the mission for nominal operations. Until this
transition point, the spacecraft will remain very inactive, with
only star catalog updates planned.
The spacecraft engineering elements and payload instruments
continue to perform well, and within specification.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Choose a job you love, and
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you'll never have to work
|_____|/ |_|/ |_____|/ | a day in your life.
|
| 528.104 | Mars Observer Update 12/28/92 | PONIL::J_BUTLER | E pur, si muove... | Mon Dec 28 1992 20:14 | 65 |
| Article 2750 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 12/28/92
Message-ID: <1992Dec28.174738.14219@news.arc.nasa.gov>
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
December 28, 1992
10:00 AM PST
Launch +94 Days
The Spacecraft Team reports that spacecraft subsystems and instruments
are performing nominally. The spacecraft is in Array Normal Spin state;
the downlink data rate is at 250 bps while the uplink data rate is 125 bps.
C5 A execution began on December 19. C5 is the outer cruise transition
sequence which is marked by the spacecraft attitude being changed from
an off sun orientation to direct pointing at Earth. The planned C5 execution
completion date is January 4, 1993.
Stored sequence activities are at a minimum for the next several days.
The Inner/Outer Cruise transition star catalog/ephemeris is scheduled to
be uplinked January 2. The Flight Sequence C5 B load will be uploaded on
January 3. The High Gain Antenna "Use" command is scheduled to be sent
on January 4.
Mission Operations is planning to send interactive commands to power on
and power off several subsystem heaters this week; no instrument
commanding is involved. This is being done to dissipate an excessive
power build up which resulted from last week's sun-coning. The acting
Mission Manager and Spacecraft Team are meeting this morning to review
this strategy and to plan command approval meetings as necessary.
The MOC (Mars Observer Camera) "bakeout", which was earlier scheduled to
end today, is now planned to continue into C6 through January 14. The
MOC Instrument Team agreed to this Spacecraft Team requested change to help
with excess power dissipation. The January 14 MOC heater power off date
allows 4 days for the instrument to return to equilibrium for the scheduled
January 18 focus test.
Today the spacecraft is 36,744,962 km (22,832,261 miles) from Earth,
traveling at a velocity of 9.0877 kilometers per second (20,328 miles per
hour) with respect to Earth. One way light time is approximately 123
seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Choose a job you love, and
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you'll never have to work
|_____|/ |_|/ |_____|/ | a day in your life.
|
| 528.105 | Mars Observer Update 12/29/92 | PONIL::J_BUTLER | E pur, si muove... | Tue Dec 29 1992 17:06 | 57 |
| Article 2756 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 12/29/92
Message-ID: <1992Dec29.180938.21249@news.arc.nasa.gov>
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
December 29, 1992
8:30 AM PST
Launch +95 Days
The Spacecraft Team reports that spacecraft subsystems and
instruments are performing nominally. The spacecraft is in Array
Normal Spin; the downlink data rate is at 250 bps while the
uplink data rate is 125 bps.
C5 continues executing as expected.
Yesterday's status update reported that Mission Operations is
planning to send interactive commands to power on an power off
subsystem heaters this week to dissipate excessive power build
up. It inaccurately attributed that excess power to the length of
time spent in Sun Comm Power while teams prepared to recover from
the loss of inertial reference.
Further information from the Spacecraft Team indicates that the
power build up is not due to that reason, but instead, to greater
than expected solar array efficiency in producing power. Power
subsystem and Spacecraft Team engineers were better able to
analyze performance through refinement of subsystem power models
and information received from flight up to this point.
Today the spacecraft is 37,533,188 km (23,322,041 miles) from
Earth, travelling at a velocity of 9.2476 km per second (20,686
mph) with respect to Earth. One way light time is approximately
125 seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Choose a job you love, and
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you'll never have to work
|_____|/ |_|/ |_____|/ | a day in your life.
|
| 528.106 | Mars Observer Update 12/30/92 | PONIL::J_BUTLER | E pur, si muove... | Wed Dec 30 1992 17:50 | 46 |
| Article 2761 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 12/30/92
Message-ID: <1992Dec30.192745.11092@news.arc.nasa.gov>
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
December 30, 1992
11:00 AM PST
Launch +96 Days
The Spacecraft Team reports that spacecraft subsystems and instruments
are performing nominally. The spacecraft is in Array Normal Spin; the
downlink data rate is at 250 bps while the uplink data rate is 125 bps.
C5 A execution began on December 19. C5 is the outer cruise transition
sequence which is marked by the spacecraft attitude being changed from
an off sun orientation to direct pointing at Earth. The Mission Manager
reports that we are on schedule for transition to outer cruise operations
on January 2 and to High Gain Antenna operations on January 4.
Today the spacecraft is 38,335,379 km (23,820,500 miles) from Earth,
traveling at a velocity of 9.4083 kilometers per second (21,046 miles per
hour) with respect to Earth. One way light time is approximately 128
seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Choose a job you love, and
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you'll never have to work
|_____|/ |_|/ |_____|/ | a day in your life.
|
| 528.107 | Mars Observer Update 01/04/93 | PONIL::J_BUTLER | E pur, si muove... | Tue Jan 05 1993 14:04 | 61 |
| Article 2778 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 01/04/93
Message-ID: <1993Jan5.013312.26366@news.arc.nasa.gov>
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
January 4, 1993
1:00 PM PST
The spacecraft is in Array Normal Spin; the downlink data rate is at 250
bps while the uplink data rate is 125 bps utilizing the Low Gain Antenna.
The spacecraft experienced 2 inertial reference loss occurrences over the
period January 1 and 2 due to the Celestial Sensor Assembly misidentified
star threshold being exceeded, causing the spacecraft to enter Sun Comm
Power state. Those occurred at 5:52 PM January 1 and at 11:05 PM January 2.
A third loss of inertial reference occurred at 12:05 PM, January 2,
while in the Sun Star Init step of recovery from the 1st inertial reference
loss. The Sun Star Init CSA misidentified stars threshold, which is lower
in Sun Star Init than it is while in Array Normal Spin, again caused an
inertial reference loss, but was reset prior to entry to Sun Comm Power
mode. Flight Teams were successful in returning the spacecraft to ANS at
1:22 PM on January 3.
A "Tiger Team" was formed and is examining all possible avenues to
resolve this problem. The team consists of Spacecraft Team members, Non-
Mars Observer JPL experts, and General Electric personnel who worked on
CSA development.
Engineers are working on interim procedures to maintain the spacecraft in
Array Normal Spin state in anticipation of Tiger Team recommendation
implementation. Meetings will take place this week to discuss, authorize
generation of, and approve these commands.
The C5 B uplink, which includes transition to High Gain Antenna
operations, has been moved to January 5 from January 3, with activation
now scheduled for January 6. These scheduled changes have been made to
allow Spacecraft Team and AACS (Attitude and Articulation Control Subsystem)
engineers an additional 3 days to gather data in ANS state.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Choose a job you love, and
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you'll never have to work
|_____|/ |_|/ |_____|/ | a day in your life.
|
| 528.108 | Mars Observer Update 01/05/93 | TINCUP::J_BUTLER | E pur, si muove... | Tue Jan 05 1993 17:17 | 54 |
| Article 2784 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update - 01/05/93
Message-ID: <1993Jan5.185828.27817@news.arc.nasa.gov>
Followup-To: sci.space
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Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
January 5, 1993
The Mars Observer spacecraft is being prepared for the outer
cruise flight sequence. Adjustments to point the high-gain
antenna directly at the sun are continuing through Jan. 6, 1993,
at which time the antenna will be powered on to begin receiving
and sending engineering and science data.
The spacecraft team reports that all spacecraft subsystems
and instruments are performing well. The camera "bakeout" to
prepare the instrument for operation will continue through Jan.
14, followed by a focusing test on Jan. 18.
Today the spacecraft is about 43 million kilometers (27
million miles) from Earth, traveling at a speed of about 36,000
kilometers per hour (23,000 miles per hour) relative to Earth.
The spacecraft is traveling at a heliocentric velocity of about
97,000 kilometers (61,000 miles per hour). One-way light time is
approximately 128 seconds.
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Choose a job you love, and
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you'll never have to work
|_____|/ |_|/ |_____|/ | a day in your life.
|
| 528.109 | Mars Observer Update #2 - 01/05/93 | PONIL::J_BUTLER | E pur, si muove... | Wed Jan 06 1993 16:54 | 53 |
| Article 2785 of sci.space.news:
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From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Subject: Mars Observer Update #2 - 01/05/93
Message-ID: <1993Jan6.020239.18192@news.arc.nasa.gov>
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
January 5, 1993
11:00 AM PST
The spacecraft is in Array Normal Spin; the downlink data rate is at 250
bps while the uplink data rate is 125 bps utilizing the Low Gain Antenna.
The Spacecraft Team continues to receive telemetry showing the Attitude
Control Subsystem star sensing component to be indicating an
unexpectedly high number of misidentified stars. Interim procedures have
been put in place by engineering and operations personnel to maintain the
spacecraft in Array Normal Spin state should the misidentified stars
count again increase toward the threshold at which on-board systems
detect inertial reference loss and intitiate fault protection measures.
Additionally, commands are being readied to change spacecraft data
Subcom maps to provide enhanced telemetry. Command approval meetings
take place early this afternoon, with the commands to be be transmitted
thereafter.
Flight Sequence C5 B activation, which would affect transition to High
Gain Antenna operations, has been moved out 24 hours to January 7. This
change has been made to allow Spacecraft Team, AACS (Attitude and
Articulation Control Subsystem) engineers, and the Tiger Team time to
gather and study the enhanced data in ANS state in order to gain a better
understanding of the CSA misidentified star situation.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Choose a job you love, and
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you'll never have to work
|_____|/ |_|/ |_____|/ | a day in your life.
|
| 528.110 | Mars Observer Update 01/08/93 | PONIL::J_BUTLER | E pur, si muove... | Mon Jan 11 1993 13:58 | 57 |
| Article 2822 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 01/08/93
Message-ID: <9JAN199318230492@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
January 8, 1993
1:30 PM PST
The spacecraft is in Array Normal Spin and continues to perform as
expected. Teams are continuing to study the Attitude Control Subsystem
miscompared star problem.
Downlink is via the HGA (High Gain Antenna) at 2 kilobits per second.
Uplink is at 125 bps using the LGA (Low Gain Antenna). HGA calibration
activities were completed last evening. Those calibrations indicate
HGA performance to be nominal.
With completion of C5 B as scheduled at 7:00 PM last evening, no flight
sequences are currently active. This is to provide a ten day window to
allow upload of a new Flight Software build.
Teams are preparing Flight Software Build 7.1.1 for uplink on January 13
though 15. Build 7.1.1 contains changes to AACS (Attitude and Articulation
Control Subsystem) Fault Protection logic determined to be necessary by
the Spacecraft Team. These changes are not related to the Celestial
Sensor Assembly miscompared star situation.
The next Flight Sequence, C6 B (necessary C6 A activities were moved
into C5 B) is scheduled to go active on January 18.
Ka Band Link Experiment (KaBLE) activities have begun and are scheduled
to take place daily through January 12. There are additional KaBLE
opportunities projected for January 16 and 17.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Choose a job you love, and
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you'll never have to work
|_____|/ |_|/ |_____|/ | a day in your life.
|
| 528.111 | Mars Observer Update 01/12/93 | PONIL::J_BUTLER | E pur, si muove... | Wed Jan 13 1993 14:50 | 60 |
| Article 2837 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 01/12/93
Message-ID: <12JAN199321480309@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
January 12, 1993
1:00 PM PST
The spacecraft is in Array Normal Spin state and Outer Cruise
configuration and continues to perform as expected. Teams are continuing
to study the Attitude Control Subsystem miscompared star problem. An
interim solution has been uplinked and is active, pending approval and
implementation of the permanent fix.
Downlink is via the HGA (High Gain Antenna) at 2 kilobits per second.
Uplink is at 125 bps using the LGA (Low Gain Antenna).
The window for uplink of Flight Software Build 7.1.1 opens at 9:25 PM this
evening (93013 0525 UTC) and closes at 7:55 PM on Friday. Build 7.1.1
contains changes to AACS (Attitude and Articulation Control Subsystem)
Fault Protection logic determined to be necessary by the Spacecraft Team
and approved by Flight Engineering Office and Project management.
A relatively small number of Flight Software modules are being replaced,
the larger number of modules remaining unchanged. These changes are not
related to the Celestial Sensor Assembly miscompared star situation.
No stored flight sequences are active. The next, C6 B, is scheduled to go
active on January 18.
Ka Band Link Experiment (KaBLE) activities will end this evening due to
the Flight Software load. There are additional KaBLE opportunities
projected for January 16 and 17.
Today the spacecraft is 50,015,515 km from Earth (31,078,200 miles)
travelling at a velocity of 11.55 meters/second (25,829 mph). One way
light time is approximately 167 seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Choose a job you love, and
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you'll never have to work
|_____|/ |_|/ |_____|/ | a day in your life.
|
| 528.112 | Mars Observer Updates Jan 13 & 14, 1993 | TINCUP::J_BUTLER | E pur, si muove... | Thu Jan 14 1993 18:47 | 113 |
| Article 2849 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 01/13/93
Message-ID: <14JAN199300204946@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
January 13, 1993
1:00 PM PST
(All times PST)
The spacecraft is in Array Normal Spin state and Outer Cruise
configuration and continues to perform as expected. Downlink is via the
HGA (High Gain Antenna) at 2 kilobits per second. Uplink is at 125 bps
using the LGA (Low Gain Antenna).
The first Flight Software (FSW) Version 7.1.1 "Task Swap" load was
uplinked last evening. Despite strong weather at Goldstone causing
sporadic data outages, uplinks planned for last night were completed by
2:38 AM this morning and Spacecraft Team analysis verifying success of
the uplink completed by 2:56 AM.
The first uplink loaded and activated the updated FSW modules in Standard
Control Processor (SCP) 2, the non-control SCP. The command to
deactivate SCP 2 is scheduled to be sent after verification that the
software is performing as expected.
Remaining FSW uplink activity will load and activate SCP1, the control
SCP. After Spacecraft Team verification that this load is performing well,
SCP2 will be reactivated. All FSW task swap activity will be completed by
Thursday at 5:30 PM.
Up to this point, the Ka Band Link Experiment (KaBLE) has successfully
acquired carrier at the Ka band. Attempts to acquire Ka band telemetry
will resume after 5:30 PM on Thursday.
No stored flight sequences are currently active. The next, C6 B, is
scheduled to go active on January 18. A description of C6 B activities will
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Choose a job you love, and
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you'll never have to work
|_____|/ |_|/ |_____|/ | a day in your life.
{Header deleted -- jb}
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
January 14, 1993
9:00 AM PST
The spacecraft is in Array Normal Spin state and Outer Cruise
configuration and continues to perform as expected. Downlink is via the
HGA (High Gain Antenna) at 2 kilobits per second. Uplink is at 125 bps
using the LGA (Low Gain Antenna).
As reported by the Spacecraft Team (C. Whetsel), the Flight Software Task
Swap to FSW version 7.1.1 continued on schedule per procedure. For the
second night in a row, weather conditions at DSS-15 (Goldstone 34 meter
antenna) continued to be a factor, affecting both downlink and uplink.
Again, the preparation of redundant memory readout requests within each
command file allowed the flight team to complete all procedure activities
ahead of schedule, in spite of data losses. All planned data validations
were completed. After the handover to DSS 45 at 2:15 AM, no further link
problems were encountered.
Following the planned uplink procedure, the new code was deactivated in
the non-control SCP(SCP2) following an initial flight validation period of
just under 24 hours. SCP2 was then commanded to resume its "MEOK"
signal, designating it as a valid back-up computer if the control SCP is
required to relinquish control for any reason. Following this, the new code
was loaded into the non-control SCP(SCP1) and validated, but was not
activated (per the procedure). As of the time of the System Engineer's
report, the new FSW code is resident in both SCPs, but is not active in
either SCP. The new code will be activated in the control SCP (SCP1) this
afternoon at 1:00 PM. If all goes well with that activation, the spacecraft
will be monitored for 24 hours and then the new code will be reactivated
in the non-control SCP (SCP2) on Friday afternoon. The procedure will be
completed Friday afternoon after commanding the spacecraft to dump a
complete memory image of the onboard FSW and commanded to stop the
recording of data on DTR2 (Digital Tape Recorder #2).
Yesterday's update advised that Ka Band Link Experiment opportunities
occur after 5:30 PM today. The next opportunity will be after completion
of FSW activities on Friday at 6:00 PM. Remaining KaBLE opportunities
will consist of 3 windows of 4 to 6 hours each on January 16, 17, and 18.
No stored flight sequences are currently active. The next, C6 B, is
scheduled to go active on January 18.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Choose a job you love, and
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you'll never have to work
|_____|/ |_|/ |_____|/ | a day in your life.
|
| 528.113 | Thermal Emission Spectrometer (TES) Briefing | PONIL::J_BUTLER | E pur, si muove... | Thu Jan 21 1993 17:26 | 38 |
| Article 55383 of sci.space:
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From: collins@well.sf.ca.us (Steve Collins)
Subject: Mars Observer TES
Message-ID: <C16r4s.213@well.sf.ca.us>
Sender: news@well.sf.ca.us
Organization: Whole Earth 'Lectronic Link
Date: Thu, 21 Jan 1993 04:00:27 GMT
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I went to a breifing today by Thermal Emission Spectrometer (TES) folks.
They are working to get some instrument calibrations done before we get to
Mars and gave a wonderful overview of their instrument and science objectives.
It was really an exciting presentation,
It was really an exciting presentation. The TES can produce very detailed
infrared spectra with enough spatial resolution to correlate them to
geologic features. Since different minerals have distinct IR absorption
signatures, they will be able to do detailed mineralogy from orbit!
They will also use TES to study atmospheric phenomona and the polar ice
caps. Most of the Mars minerology and geochemistry data to date is based
on assumptions about similarities to Earth. Now we will be able to make
a map that says Basalt over here and Limestone over there...
If there is limestone. One of the big questions is whether there was
substatial
water (oceans!) in Mars' early history. If so there may be evidence in
the form of Salt deposits and limestone. This would be the place to
go looking for fossils, since (on earth at least) there was life in the
oceans fairly early on. I
Keep an eye out for TES results in journals near you...W~r
Steve Collins MO Spacecraft Team (AACS)
|
| 528.114 | Mars Observer Update -- 01/20/93 | PONIL::J_BUTLER | E pur, si muove... | Thu Jan 21 1993 17:27 | 56 |
| Article 2908 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 01/20/93
Message-ID: <21JAN199317204961@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
January 20, 1993
9:00 AM PST
Flight Sequence C6 B became active at 11:58 AM on January 18.
Magnetometer/Electron Reflectometer, Gamma Ray Spectrometer, and
Mars Observer Camera were powered on for instrument calibration
activities. The MOC test continues through noon Monday, January 25, while
MAG/ER (Magnetometer/Electron Reflectometer) and GRS (Gamma Ray Spectrometer)
calibrations continue beyond that date. The MOC PI (Principal Investigator)
reports that the instrument is performing as expected, but will not have
image information available until sufficient analysis has been performed.
Digital Tape Recorders 1 and 3 will be played back on January 26 and 27.
DTRs 1 and 3 contain the Geotail measurement data collected in December.
Efforts to receive Ka band telemetry last week were successful.
The Spacecraft Team reports that the spacecraft is performing nominally
in Array Normal Spin. Uplink and downlink are via the HGA (High Gain
Antenna); uplink is at 125 bps; downlink at the 2k engineering rate during
periods of minimal activity, the 4k Science and Engineering rate during
instrument calibration activities, and at 16K during DTR playback.
Today the spacecraft is 58,313,994 km (36,234,636 miles) from Earth,
traveling at a velocity of 12.9012 kilometers per second (28,859 miles
per hour) with respect to Earth. One way light time is approximately 195
seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Every once in a while,
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | try pushing your luck.
|_____|/ |_|/ |_____|/ |
|
| 528.115 | Mars Observer Update -- 01/22/93 | PONIL::J_BUTLER | E pur, si muove... | Mon Jan 25 1993 18:30 | 58 |
| Article 2914 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 01/22/93
Message-ID: <22JAN199319260080@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
January 22, 1993
10:00 AM PST
Flight Sequence C6 B is active. Magnetometer/Electron Reflectometer,
Gamma Ray Spectrometer, and Mars Observer Camera (MOC) instrument
calibration activities continue.
Digital Tape Recorders 1 and 3 will be played back on January 26 and 27.
DTRs 1 and 3 contain the Geotail measurement data collected in December.
The Spacecraft Team reports that the spacecraft is performing nominally
in Array Normal Spin. Uplink and downlink are via the HGA (High Gain
Antenna); uplink is at 125 bps; the downlink rate is being varied among
2k engineering, 4k Science and Engineering, and 16K for MOC Focus Test
activities.
On Wednesday morning, the Thermal Emissions Spectrometer Principal
Investigator (P. Christensen of ASU) presented an overview of TES
including scientific objectives, instrument sub-sections, and a summary
of instrument commanding to Mission Operations System team members.
Dr. Christensen also discussed the TES Team's rationale for proposed
instrument calibrations at some point within 10 to 20 days prior to Mars
Orbit Insertion.
Next week, flight sequence C7 will be updated with final TCM-2
(Trajectory Corretion Maneuver #2) parameters as developed by the Navigation
and Spacecraft teams. TCM-2 will provide a velocity change of approximately
10 meters/second. Uplink of C7 is scheduled for February 6 with sequence
activation and the maneuver to take place on February 8.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Every once in a while,
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | try pushing your luck.
|_____|/ |_|/ |_____|/ |
|
| 528.116 | Mars Observer Updates 1 & 2 -- 01/25/93 | PONIL::J_BUTLER | E pur, si muove... | Tue Jan 26 1993 12:33 | 88 |
| Article 2933 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 01/25/93
Message-ID: <26JAN199301544405@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
Keywords: Mars Observer, JPL
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Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
January 25, 1993
The Mars Observer spacecraft team reports that all
spacecraft and science operations are performing well.
The Mars Observer camera, magnetometer/electron
reflectometer and gamma ray spectrometer were turned on Jan. 18
for instrument calibration activities, and began returning data
the following day. The camera focus tests were completed at noon
today, while data-gathering by the two other instruments
continues this week.
Data from the magnetometer recorded near the Earth's geotail
-- that region of space in which the solar wind is blocked as the
Earth orbits the sun -- will be played back from tape recorders 1
and 3 on Jan. 26 and 27. Meanwhile, a telecommunications
experiment, called the "Ka Band Link Experiment," is being
performed to test the quality of ground-to-spacecraft
communications using a very short, 9-millimeter (36/100ths of an
inch) wavelength and a low-power transmitter on board the
spacecraft. All other uplink and downlink activities are now
performed using the spacecraft's high-gain antenna.
Today the spacecraft is about 64 million kilometers (40
million miles) from Earth, traveling at a speed of about 47,000
kilometers per hour (31,000 miles per hour) with respect to
Earth. The spacecraft is traveling at a heliocentric velocity of
about 93,500 kilometers per hour (58,000 miles per hour). One-
way light time is roughly 195 seconds.
** [header and sig deleted--jb] **
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
January 25, 1992
2:45 PM PST
Flight Sequence C6 B is active. Magnetometer/Electron Reflectometer and
Gamma Ray Spectrometer are taking data; the Mars Observer Camera focus
test ended at noon today. The MOC team has selected an optimal focus
setting based on information developed in testing.
Digital Tape Recorders 1 and 3 will be played back on tomorrow and
Wednesday. DTRs 1 and 3 contain the Geotail measurement data collected
in December.
The Spacecraft Team reports that the spacecraft is performing nominally
in Array Normal Spin. Uplink and downlink are via the HGA (High Gain
Antenna); uplink is at 125 bps; the downlink rate is at 16K.
Flight sequence C7 is being updated with final TCM-2 (Trajectory Correction
Maneuver #2) parameters as developed by the Navigation and Spacecraft teams.
TCM-2 will provide a velocity change of approximately 10 meters/second.
Uplink of C7 is scheduled for February 6 with sequence activation and the
maneuver to take place on February 8.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Every once in a while,
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | try pushing your luck.
|_____|/ |_|/ |_____|/ |
|
| 528.117 | Mars Observer Update -- 01/26/93 | PONIL::J_BUTLER | E pur, si muove... | Wed Jan 27 1993 12:59 | 51 |
| Article 2945 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 01/26/93
Message-ID: <27JAN199301165056@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
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Keywords: Mars Observer, JPL
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
January 26, 1993
1:00 PM PST
Flight Sequence C6 B is active. Magnetometer/Electron Reflectometer and
Gamma Ray Spectrometer are taking data.
Digital Tape Recorder 1 is being played back today, with DTR3 playback
scheduled for tomorrow. DTRs 1 and 3 contain the Geotail measurement
data collected in December.
The Spacecraft Team reports that the spacecraft is performing nominally
in Array Normal Spin. Uplink and downlink are via the HGA (High Gain
Antenna); uplink is at 125 bps; the downlink rate is at the
4 kilobits/second Science and Engineering data rate, with an approximate
2 hour telecom configuration at the 85 K rate planned between 1:00 PM and
3:30 PM today, after which downlink will be returned to 4K.
Flight sequence C7 is being updated with final TCM-2 (Trajectory
Correction Maneuver #2) parameters as developed by the Navigation and
Spacecraft teams. TCM-2 will provide a velocity change of approximately
10 meters/second. Uplink of C7 is scheduled for February 6 with sequence
activation and the maneuver to take place on February 8.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Every once in a while,
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | try pushing your luck.
|_____|/ |_|/ |_____|/ |
|
| 528.118 | Mars Observer Update -- 01/28/93 | PONIL::J_BUTLER | E pur, si muove... | Fri Jan 29 1993 13:11 | 59 |
| Article 2956 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 01/28/93
Message-ID: <28JAN199316463488@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
Keywords: Mars Observer, JPL
Sender: digester@news.arc.nasa.gov
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Date: Thu, 28 Jan 1993 16:46:00 GMT
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
January 28, 1993
8:30 AM PST
Flight Sequence C6 B is active. Magnetometer/Electron Reflectometer and
Gamma Ray Spectrometer are taking data.
The Spacecraft Team reports that the spacecraft is performing nominally
in Array Normal Spin. Uplink and downlink are via the HGA (High Gain
Antenna); uplink is at 125 bps; downlink is at the 4 kilobits/second
Science and Engineering data rate.
Playback of DTRs (Digital Tape Recorders) 1 and 3 completed yesterday.
An initial problem flowing data at the 85 Kilobit playback rate due to
ground configuration was experienced Tuesday but was resolved quickly.
No data was lost. DTRs 1 and 2 contained the Geotail measurement data
collected in December.
Flight Engineering Office teams are investigating an apparent
dissimilarity between on-board Standard Control Processor spacecraft
state indications. The control SCP shows the expected state, while the
backup SCP indicates the spacecraft to be in Contingency mode. There is
no present danger or risk to the spacecraft. A memory readout of the
COMPOOL area of SCP2 will be performed today, and compared to
telemetry being received from SCP1.
Flight sequence C7 is being updated with final TCM-2 (Trajectory Correction
Maneuver #2) parameters as developed by the Navigation and Spacecraft teams.
TCM-2 will provide a velocity change of approximately 10 meters/second.
Uplink of C7 is scheduled for February 6 with sequence activation and the
maneuver to take place on February 8.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Every once in a while,
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | try pushing your luck.
|_____|/ |_|/ |_____|/ |
|
| 528.119 | Mars Observer Update -- 02/01/93 | CXDOCS::J_BUTLER | E pur, si mouve... | Tue Feb 02 1993 19:30 | 60 |
| Article: 2984
Newsgroups: sci.space.news
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 02/01/93
Message-ID: <1FEB199319500497@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
Keywords: Mars Observer, JPL
Sender: digester@news.arc.nasa.gov
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Date: Mon, 1 Feb 1993 19:50:00 GMT
Approved: sci-space-news@ames.arc.nasa.gov
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
February 1, 1993
10:00 AM PST
Flight Sequence C6 B is active. Magnetometer/Electron Reflectometer and
Gamma Ray Spectrometer are taking data through Friday at 11:05 AM.
The Spacecraft Team reports that the spacecraft is performing nominally
in Array Normal Spin in the outer cruise configuration. Uplink and
downlink are via the HGA (High Gain Antenna); uplink is at 125 bps; downlink
is at the 4 kilobits/second Science and Engineering data rate.
Today, the stored sequence will perform 490-Newton thruster injector
heaters tests in anticipation of TCM-2 (Trajectory Correction Maneuver #2).
Teams are preparing commands to be sent later this week to return
Standard Control Processor 2 to ANS state. A memory readout of the
COMPOOL area of SCP2 performed Thursday is being compared to telemetry
received from SCP1 for the same period. Reasons for the occurrence are
under investigation with final results due later this week.
Flight sequence C7 is being updated with final TCM-2 maneuver
parameters as developed by the Navigation and Spacecraft teams. TCM-2
will provide a velocity change of 9.6 meters/second. The window for
uplink of C7 A opens at 6:41 AM Sunday, February 7 and closes at 7:45 AM
Monday, February 8. C7 A sequence activation takes place at 8:00 AM,
Monday February 8, and the maneuver takes place at 2:00 PM, also on
February 8.
As of tomorrow, the spacecraft will be closer to Mars than to Earth. Today
the spacecraft is 45,831,202 km (28,478,188 miles) from Mars, traveling
at a velocity of 6.1124 kilometers per second (132,673 miles per hour)
with respect to Mars. One way light time to Earth is approximately 241
seconds - slightly more than 4 minutes.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Never yell "Movie!" in a
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | crowded fire station.
|_____|/ |_|/ |_____|/ |
|
| 528.120 | Mars Observer Update -- 02/05/93 | PONIL::J_BUTLER | E pur, si muove... | Mon Feb 08 1993 18:41 | 60 |
| Article 3018 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 02/05/93
Message-ID: <8FEB199307552134@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
Keywords: Mars Observer, JPL
Sender: digester@news.arc.nasa.gov
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Date: Mon, 8 Feb 1993 07:55:00 GMT
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
February 5, 1993
11:00 AM PST
Back-Up Standard Control Processor (SCP2) recovery activities were
successfully completed Thursday, February 4.
The Spacecraft Team reports that the spacecraft is performing nominally
in Array Normal Spin in the outer cruise configuration. Uplink and
downlink are via the HGA (High Gain Antenna); uplink is at 125 bps; downlink
is at the 2 kilobits/second engineering data rate.
Bi-propellant injector heaters were tested this morning and all were
verified operational for TCM (Trajectory Correction Maneuver) activity next
week.
Magnetometer/Electron Reflectometer and Gamma Ray Spectrometer
calibration data taking ended when SCP2 recovery activities began
Wednesday morning. Flight Sequence C6 B clocked out at 11:08 this
morning. Currently, no stored flight sequences are active.
Flight sequence C7 has been updated with final TCM-2 maneuver
parameters. TCM-2 will provide a velocity change of 9.6 meters/second.
The window for uplink of C7 A opens at 6:41 AM Sunday, February 7 and
closes at 7:45 AM Monday, February 8. C7 A sequence activation takes
place at 8:00 AM, Monday February 8, and the maneuver takes place at 2:00
PM, also on February 8.
Today the spacecraft is 43,888,561 km (27,271,088 miles) from Mars,
traveling at a velocity of 5.7869 kilometers per second (12,945 miles per
hour) with respect to Mars. One way light time to Earth is approximately
258 seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Never yell "Movie!" in a
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | crowded fire station.
|_____|/ |_|/ |_____|/ |
|
| 528.121 | Mars Observer Update -- 02/08/93 | PONIL::J_BUTLER | E pur, si muove... | Tue Feb 09 1993 12:26 | 55 |
| Article 3023 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 02/08/93
Message-ID: <9FEB199300492328@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
Keywords: Mars Observer, JPL
Sender: digester@news.arc.nasa.gov
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Date: Tue, 9 Feb 1993 00:49:00 GMT
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
February 8, 1993
3:15 PM PST
Flight sequence C7, which contains final TCM-2 (Trajectory Correction'
Maneuver #2) parameters, was successfully uplinked yesterday at 6:54 AM.
TCM-2 will provide a velocity change of 9.65 meters/second through a 29.4
second plus a 5 second ullage "burn" of # 2 and 4 490 Newton Thrusters.
C7 A sequence activation took place at 8:00 AM this morning, and the
maneuver itself at 2:00 PM.
Preliminary indications from telemetry received approximately 38
minutes after the event are that the maneuver was successful. Spacecraft
Team Attitude, Articulation and Control Subsystem team members say that
the duration and magnitude of the "burn" were as specified. The
Navigation Team Chief advises that preliminary Doppler Shift indications
verify a nominal maneuver. More in-depth analysis by Navigation will be
necessary before maneuver precision can be evaluated.
Spacecraft Team Systems Engineering informed the Mission Manager that
recorded data playback had begun, verifying spacecraft downlink
capability at playback data rates.
Today the spacecraft is 42,962,231 km (26,675,493 miles) from Mars,
traveling at a velocity of 5.6293 kilometers per second (12,592 miles per
hour) with respect to Mars. One way light time to Earth is approximately
266 seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Never yell "Movie!" in a
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | crowded fire station.
|_____|/ |_|/ |_____|/ |
|
| 528.122 | Mars Observer Update -- 02/10/93 | PONIL::J_BUTLER | E pur, si muove... | Wed Feb 10 1993 20:01 | 59 |
| Article 3036 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 02/10/93
Message-ID: <10FEB199317233789@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
Keywords: Mars Observer, JPL
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Date: Wed, 10 Feb 1993 17:23:00 GMT
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Lines: 40
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
February 10, 1993
9:00 AM PST
Flight sequence C7 A is active. The Flight Team reports that spacecraft
subsystems and the instrument payload are performing nominally in Array
Normal Spin in outer cruise configuration. Uplink and downlink are via the
High Gain Antenna; uplink at 125 bps, downlink at the 2 Kbps Science and
Engineering data rates.
The Navigation Team will be presenting its maneuver assessment at 4:00
PM today. Preliminary indications shortly after the maneuver were that
burn duration and magnitude occurred as expected, and preliminary doppler
shift measurements indicated the maneuver to be within desired limits.
More complete and precise maneuver results will be presented this
afternoon.
The uplink window for Flight Sequence C7 B opened this morning at 2:07
AM and closes Thursday morning at 7:50 AM, with C7 B activation to occur
at 8:00 AM tomorrow.
The Mars Observer Camera Principal Investigator (M. Malin) of Malin Space
Science Systems in LaJolla will present at today's Mission Planning Team
meeting at JPL. Dr. Malin will give an overview of the MOC Instrument and
science objectives and his team's rationale for proposed imaging
activities during Mars approach.
Today the spacecraft is 41,627,338 km (25,866,028 miles) from Mars,
traveling at a velocity of 5.3995 kilometers per second (12,078 miles per
hour) with respect to Mars. One way light time to Earth is approximately
279 seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Never yell "Movie!" in a
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | crowded fire station.
|_____|/ |_|/ |_____|/ |
|
| 528.123 | Mars Observer Update #2 -- 02/10/93 | PONIL::J_BUTLER | E pur, si muove... | Mon Feb 15 1993 19:00 | 54 |
| Article 3058 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update #2 - 02/10/93
Message-ID: <11FEB199321253462@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
Keywords: Mars Observer, JPL
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Date: Thu, 11 Feb 1993 21:25:00 GMT
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Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
February 10, 1993
The Mars Observer flight team reported today that the second
spacecraft trajectory correction maneuver (TCM-2) on Monday, Feb.
8, was successful and achieved the desired change in velocity of
about 9.6 meters per second (32 feet per second). The 35-second
burn used two of the spacecraft's four large 490-Newton thrusters
and occurred at 2 p.m. Pacific Standard Time.
All spacecraft subsystems and instrument payload are
performing well in the outer cruise configuration. Uplink and
downlink communications are being performed via the high-gain
antenna.
Today the spacecraft is about 42 million kilometers (26
million miles) from Mars, traveling at a velocity of about 18,000
kilometers per hour (12,000 miles per hour) with respect to Mars.
One-way light time to Earth is about 279 seconds.
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Never yell "Movie!" in a
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | crowded fire station.
|_____|/ |_|/ |_____|/ |
|
| 528.124 | Mars Observer Update -- 02/11/93 | PONIL::J_BUTLER | E pur, si muove... | Mon Feb 15 1993 19:02 | 52 |
| Article 3060 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 02/11/93
Message-ID: <12FEB199304084228@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
Keywords: Mars Observer, JPL
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
February 11, 1993
3:30 PM PST
Flight sequence C7 B is active as of 8:00 AM this morning. The Flight Team
reports that spacecraft subsystems and the instrument payload are
performing nominally. The spacecraft is in Array Normal Spin in outer
cruise configuration, with uplink and downlink via the High Gain Antenna;
uplink at 125 bps, downlink at the 2 Kbps Science and Engineering data
rates.
The Navigation Team presented its preliminary analysis of TCM-2 (Trajectory
Correction Maneuver #2) yesterday. That preliminary analysis shows that the
maneuver was performed within the expected accuracy limits. The desired change
in velocity was 9.65 meters per second and the achieved velocity change was
between 9.66 and 9.74 meters per second. The resultant direction was
offset by approximately 2 degrees from the planned direction. Any offset
will be corrected in TCM-3 on March 18 as provided for in the Mars
Observer Mission Plan.
Today the spacecraft is 41,196,629 km (25,598,398 miles) from Mars,
traveling at a velocity of 5.3246 kilometers per second (11,910 miles per
hour) with respect to Mars. One way light time to Earth is approximately
284 seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Never yell "Movie!" in a
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | crowded fire station.
|_____|/ |_|/ |_____|/ |
|
| 528.125 | Mars Observer Update -- 02/16/93 | PONIL::J_BUTLER | E pur, si muove... | Wed Feb 17 1993 12:48 | 45 |
| Article 3092 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 02/16/93
Message-ID: <17FEB199300144833@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
February 16, 1993
1:00 PM PST
Flight sequence C7 B is active. The Flight Team reports that spacecraft
subsystems and the instrument payload are performing nominally. The
spacecraft is in Array Normal Spin in outer cruise configuration, with
uplink and downlink via the High Gain Antenna; uplink at 125 bps,
downlink at the 4 K Science and Engineering data rate. One way light time
is approximately 301 seconds.
The Payload Data System is active and the Gamma Ray Spectrometer is
taking calibration data. Thermal Emissions Spectrometer calibration
activities took place Friday, February 12.
The Launch + 145 Days star catalog and ephemeris uplink window opens at
5:00 PM this afternoon and closes at 11:00 AM tomorrow.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If you don't stand for
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | something, you'll fall
|_____|/ |_|/ |_____|/ | for anything.
|
| 528.126 | Mars Observer Update -- 02/17/93 | PONIL::J_BUTLER | E pur, si muove... | Mon Feb 22 1993 18:37 | 45 |
| Article 3095 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 02/17/93
Message-ID: <18FEB199300064903@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
February 17, 1993
3:30 PM PST
Flight sequence C7 B is active. The Flight Team reports that spacecraft
subsystems and the instrument payload are performing nominally. The
spacecraft is in Array Normal Spin in outer cruise configuration, with
uplink and downlink via the High Gain Antenna; uplink at 125 bps,
downlink at the 4 K Science and Engineering data rate.
The Payload Data System is active and the Gamma Ray Spectrometer is
taking calibration data.
Today the spacecraft is 38,756,470 km (24,082,154 miles) from Mars,
traveling at a velocity of 4.8928 kilometers per second (10,944 miles per
hour) with respect to Mars. One way light time is approximately 311
seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If you don't stand for
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | something, you'll fall
|_____|/ |_|/ |_____|/ | for anything.
|
| 528.127 | Mars Observer Update -- 02/18/93 | PONIL::J_BUTLER | E pur, si muove... | Mon Feb 22 1993 18:40 | 49 |
| Article 3105 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 02/18/93
Message-ID: <19FEB199301393392@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
February 18, 1993
3:30 PM PST
Flight sequence C7 B is active. The Flight Team reports that spacecraft
subsystems and the instrument payload are performing nominally. The
spacecraft is in Array Normal Spin in outer cruise configuration, with
uplink and downlink via the High Gain Antenna; uplink at 125 bps,
downlink at the 4 K Science and Engineering data rate.
The Payload Data System is active and the Gamma Ray Spectrometer is
taking calibration data.
The Flight Software Build 8.0 Final Design Review is scheduled for
tomorrow morning. The Power-In maneuver Aim Point selection meeting is
also scheduled for tomorrow.
Today the spacecraft is 38,373,013 km (23,843,885 miles) from Mars,
traveling at a velocity of 4.8237 kilometers per second (10,790 miles per
hour) with respect to Mars. One way light time is approximately 315
seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If you don't stand for
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | something, you'll fall
|_____|/ |_|/ |_____|/ | for anything.
|
| 528.128 | Mars Observer Update -- 02/19/93 | PONIL::J_BUTLER | E pur, si muove... | Mon Feb 22 1993 18:56 | 61 |
| Article 3112 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 02/19/93
Message-ID: <19FEB199322315883@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
February 19, 1993
1:30 PM PST
Flight sequence C7 B is active. The Flight Team reports that spacecraft
subsystems and the instrument payload are performing nominally. The
spacecraft is in Array Normal Spin in outer cruise configuration, with
uplink and downlink via the High Gain Antenna; uplink at 125 bps,
downlink at the 4 K Science and Engineering data rate.
The Payload Data System is active and the Gamma Ray Spectrometer is
taking calibration data.
Yesterday's status report stated that the Flight Software Build 8.0 Design
Review which took place this morning was the Final Review. In fact,
today's review was the Preliminary Design Review. Flight Software
engineers presented their rationale for changes in the Flight Software to
the Mission Manager, the Flight Engineering Office Manager and various FEO
team members, and Flight Operations Office management.
The selection of the Power-In maneuver Aim Point was made today,
finalizing the overall maneuver design process. The Power-In maneuver, so
named by the burn of bi-propellant powered thrusters required to perform
it, is being undertaken to shorten the length of time between the Mars
Orbit Insertion maneuver and achievement of the desired orbit for Mapping
activities to begin. Utilization of Power-In will allow more time for
successful deployment of the spacecraft into the mapping configuration
prior to the beginning of the command moratorium during solar
conjunction. Science will be able to advance the start of the mapping
phase, allowing clear observations of the planet surface before the
beginning of the Martian dust storm season which begins just after solar
conjunction. Science data will be acquired for one complete mapping cycle
prior to solar conjunction.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If you don't stand for
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | something, you'll fall
|_____|/ |_|/ |_____|/ | for anything.
|
| 528.129 | Mars Observer Update -- 02/24/93 | PONIL::J_BUTLER | E pur, si muove... | Mon Mar 01 1993 13:15 | 56 |
| Article 3134 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 02/24/93
Message-ID: <25FEB199315510823@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
February 24, 1993
3:30 PM PST
Flight sequence C7 B is active. The Flight Team reports that spacecraft
subsystems and the instrument payload are performing nominally. The
spacecraft is in Array Normal Spin in outer cruise configuration, with
uplink and downlink via the High Gain Antenna; uplink at 125 bps,
downlink at the 4 K Science and Engineering data rate. The Gamma Ray
Spectrometer is taking calibration data.
The MOS Uplink Manager (P. Varghese) presented an overview of the
Non-Interactive Non-Stored Command process to the Project Science Group this
morning. The presentation served to clarify the process to the Science Teams,
and described the level of activity and dependencies to be
expected during non-stored instrument commanding during the Mapping
phase of operations. Phil described the activities of the Process Action
Team in finding ways to refine and improve the process.
This afternoon, the Data Quality Tiger Team formally presented its
findings to date and recommendations to NASA MO Program Management,
Project Management and Project Science, including the Mars Observer
Camera Team.
Today the spacecraft is 36,203,720 km (22,495,949 miles) from Mars,
traveling at a velocity of 4.4263 kilometers per second (9,901 miles per
hour) with respect to Mars. One way light time to Earth is approximately
344 seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If you don't stand for
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | something, you'll fall
|_____|/ |_|/ |_____|/ | for anything.
|
| 528.130 | Mars Observer Update -- 03/01/93 | PONIL::J_BUTLER | E pur, si muove... | Tue Mar 02 1993 13:08 | 43 |
| Article 3170 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 03/01/93
Message-ID: <1MAR199321272835@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
March 1, 1993
11:00 AM PST
Flight sequence C7 B is active. The Flight Team reports that spacecraft
subsystems and the instrument payload are performing nominally. The
spacecraft is in Array Normal Spin in outer cruise configuration, with
uplink and downlink via the High Gain Antenna; uplink at 125 bps,
downlink at the 4 K Science and Engineering data rate. The Gamma Ray
Spectrometer is taking calibration data.
The Navigation and Spacecraft teams are developing parameters to update
Flight Sequence C8 for performance of Trajectory Correction Maneuver 3,
scheduled for March 18. The Maneuver Performance Data File meeting is
scheduled for 9:00 AM Friday.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If you don't stand for
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | something, you'll fall
|_____|/ |_|/ |_____|/ | for anything.
|
| 528.131 | Mars Observer ELSETs | PONIL::J_BUTLER | E pur, si muove... | Tue Mar 02 1993 13:09 | 87 |
| Article 3174 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Orbital Elements
Message-ID: <2MAR199300411325@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
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MARS OBSERVER ORBITAL ELEMENTS
March 1, 1993
The following are orbital elements for the Mars Observer
spacecraft during its interplanetary cruise, during its initial
capture orbit at Mars and during its final mapping orbit at Mars.
These orbital elements are predicts generated by the Mars
Observer Navigation Team. The actual set of orbital elements
achieved by the spacecraft will deviate somewhat.
_________________________________________________________________
INTERPLANETARY CRUISE
Semi-major axis 197163351.177 km
Eccentricity 0.23885397 deg
Inclination 1.294 deg
Argument of periapsis -173.656 deg
Ascending node -177.619 deg
Mean anomaly of epoch 110.042 deg
Epoch of elements: March 18, 1993 18:53:38.38 Ephemeris Time
Coordinate system: Sun-centered, Earth Mean Orbit and Equinox
of Epoch J2000
_________________________________________________________________
CAPTURE ORBIT
Semi-major axis 42923.941 km
Eccentricity 0.907977 deg
Inclination 89.000 deg
Argument of periapsis 112.990 deg
Ascending node -106.453 deg
Mean anomaly of epoch -180.000 deg
Epoch of elements: August 26, 1993 10:10:52.78 Ephemeris Time
Coordinate system: Mars-centered, Mars Mean Equator and IAU
Vector of Epoch
_________________________________________________________________
MAPPING ORBIT
Semi-major axis 3766.159 km
Eccentricity 0.004049 deg
Inclination 92.869 deg
Argument of periapsis -90.0 deg
Ascending node 261.590 deg
Mean anomaly of epoch 0.000 deg
Epoch of elements: December 6, 1993 00:00:00.00 Ephemeris Time
Coordinate system: Mars-centered, Mars Mean Equator and IAU
Vector of Epoch
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | If you don't stand for
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | something, you'll fall
|_____|/ |_|/ |_____|/ | for anything.
|
| 528.132 | units check | AUSSIE::GARSON | | Tue Mar 02 1993 19:47 | 5 |
| re .131
>Eccentricity 0.23885397 deg
Since when was eccentricity measured in degrees?
|
| 528.133 | Mars Observer Update -- 03/08/93 | PONIL::J_BUTLER | E pur, si muove... | Tue Mar 09 1993 13:40 | 51 |
| Article 3210 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 03/08/93
Message-ID: <9MAR199300541984@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
March 8, 1993
4:00 PM PST
Flight sequence C7 B is active through shortly before 8:00 AM, Thursday
March 18. Activation of C8 containing TCM-3 (Trajectory Correction
Maneuver #3) occurs at 8:00 AM, also on March 18. The TCM-3 maneuver
itself occurs at 2:00 PM that afternoon. The Flight Team reports that
spacecraft subsystems and the instrument payload are performing nominally.
The spacecraft is in Array Normal Spin in outer cruise configuration,
with uplink and downlink via the High Gain Antenna; uplink at 125 bps,
downlink at the 4 K Science and Engineering data rate. The Gamma Ray
Spectrometer is taking calibration data through Friday, March 12 at
10:00 AM.
Activities this week include a Radio Science Tracking System Calibration
Test from 6:10 PM through 8:10 PM this evening. The Launch + 166 Days
Star Catalog & Ephemeris Use Uplink Window opens at 5:00 PM tomorrow
and extends through 5:00 AM on Thursday.
The GDS (Ground Data Systems) Test Readiness Review for Encounter
will take place on March 11 from 8:00 AM to 4:00 PM in the JPL Main
Cafeteria Conference area.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | It's kind of fun to do
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | the impossible.
|_____|/ |_|/ |_____|/ | Walt Disney
|
| 528.134 | Mars Observer Update -- 03/16/93 | PONIL::J_BUTLER | E pur, si muove... | Wed Mar 17 1993 15:22 | 54 |
| Article 3280 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 03/16/93
Message-ID: <16MAR199319013284@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
March 16, 1993
The Flight Team reports that spacecraft subsystems and the instrument
payload are performing well. The spacecraft is in Array Normal Spin in
outer cruise configuration, with uplink and downlink via the High Gain
Antenna; uplink at 125 bps, downlink at the 2 K Engineering data rate.
The DSN (Deep Space Network) is providing continuous coverage to Mars
Observer in support of TCM-3 (Trajectory Correction Maneuver #3) activities.
Flight sequence C7 B continues clocking out through shortly before 8:00 AM,
Thursday March 18. Activation of C8 containing TCM-3 occurs at 8:00
AM, also on March 18. The TCM-3 maneuver itself occurs at 2:00 PM that
afternoon. TCM 3 is planned to produce a velocity change of .46 meters per
second.
Flight Team members have completed maneuver parameter updates to the
sequence, which has been successfully VTL tested.
The Maneuver Assessment Meeting is scheduled for 4:00 PM on Monday,
March 22. The Navigation and Spacecraft Teams will present their
analyses of the results of TCM-3 at that session.
Today, the spacecraft is 30,378,028 km (18,876,032 mi.) from Mars
travelling at a velocity of 3.31 kilometers/second (7404 mph) with
respect to Mars. One-way light time is approximately 444 seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Don't ever take a fence
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | down until you know the
|_____|/ |_|/ |_____|/ | reason it was put up.
|
| 528.135 | Mars Observer Update -- 03/17/93 | CXDOCS::J_BUTLER | E pur, si muove... | Tue Mar 23 1993 14:25 | 48 |
| Article: 3292
Newsgroups: sci.space.news
From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 03/17/93
Sender: digester@news.arc.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Thu, 18 Mar 1993 01:13:00 GMT
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
March 17, 1993
11:00 PST
Spacecraft subsystems and the instrument payload are performing well in
Array Normal Spin and outer cruise configuration, with uplink and
downlink via the High Gain Antenna; uplink at 125 bps, downlink at the 2K
Engineering data rate. One-way light time is 7 minutes, 28 seconds. The
DSN (Deep Space Network) is providing continuous coverage to Mars Observer
in support of TCM-3 (Trajectory Correction Maneuvers #3) activities.
Flight sequence C7 B continues clocking out through shortly before 8:00
AM tomorrow morning. Activation of C8 containing TCM-3 occurs at 8:00 AM
tomorrow, with the TCM-3 maneuver itself occurring at 11:00 AM. TCM-3 will
produce a velocity change of .46 meters per second.
Activities over the past 24 hours include:
-Uplink of Launch + 173 Days Star Catalog and Ephemeris; USE
command.
-Real time command to initialize Flight Software Integral Term
variables; Readout and verification.
-C8 Sequence Uplink.
-Command to disable Starex for duration of maneuver.
The Maneuver Assessment Meeting is scheduled for 4:00 PM on Monday,
March 22. The Navigation and Spacecraft Teams will present their
analyses of the results of TCM-3 at that session.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Don't ever take a fence
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | down until you know the
|_____|/ |_|/ |_____|/ | reason it was put up.
|
| 528.136 | Mars Observer Updates -- 03/18/93 | CXDOCS::J_BUTLER | E pur, si muove... | Tue Mar 23 1993 14:41 | 95 |
| Article: 3299
Newsgroups: sci.space.news
From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update #2 - 03/18/93
Sender: digester@news.arc.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Fri, 19 Mar 1993 02:11:00 GMT
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
March 18, 1993
1:00 PM PST
Spacecraft subsystems and the instrument payload are performing well in
Array Normal Spin and outer cruise configuration, with uplink and
downlink via the High Gain Antenna; uplink at 125 bps, downlink at the 2K
Engineering data rate. The DSN (Deep Space Network) is providing continuous
coverage to Mars Observer in support of TCM-3 (Trajectory Correction
Maneuver #3) activities.
Activation of flight sequence C8 containing TCM-3 occurred at 8:00 AM
this morning. The TCM-3 maneuver itself occurred at 11:00 AM. After a
planned telemetry outage of approximately 35 minutes, preliminary
indications received are that the maneuver went extremely well. Thruster
burn was as planned in both duration and magnitude, and the expected
spacecraft velocity change achieved.
Later today the Flight Team will play back on-board digital tape recorders
to provide data for more precise maneuver characterization. The formal
Maneuver Assessment Meeting is scheduled for 4:00 PM on Monday, March 22.
The Navigation and Spacecraft Teams will present their analyses of
the results of TCM-3 at that session.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Don't ever take a fence
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | down until you know the
|_____|/ |_|/ |_____|/ | reason it was put up.
{header delated - JB)
Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
March 18, 1993
The Mars Observer spacecraft completed its third trajectory
correction maneuver (TCM-3) today at 11 a.m. Pacific Standard
Time, setting the stage for approach and capture in Mars orbit on
Aug. 24, 1993.
The spacecraft fired four of its small 22-Newton thrusters
to achieve the desired change in velocity of 0.46 meters (1.5
feet) per second. Preliminary engineering data indicated that the
17-second maneuver was successfully completed. If necessary, a
fourth TCM will be performed 20 days before orbit insertion.
All spacecraft subsystems and instrument payload are
performing well in the outer cruise configuration. Uplink and
downlink communications are being performed via the high-gain
antenna.
Since activation of the high-gain antenna in early January,
JPL has been conducting a Ka-band communications link experiment
with the Mars Observer spacecraft. The experiment will evaluate
communications capabilities using shorter, 9-millimeter-long
wavelengths rather than the 3.5-centimeter wavelengths (X-band)
that are currently used. The experiment is the first of its kind
and was made possible with advanced technology deployed at the
Goldstone 34-meter research antenna. Early results have been
excellent and the spacecraft will be periodically tracked at Ka-
band throughout the mission. The experiment is sponsored by
NASA's Office of Space Communications and is aimed at advancing
technology for future, low-cost planetary exploration missions.
Today Mars Observer is about 30 million kilometers (18
million miles) from Mars, traveling at a velocity of about 11,000
kilometers per hour (7,500 miles per hour) with respect to Mars.
One-way light time to Earth is about 7.5 minutes (444 seconds).
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Don't ever take a fence
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | down until you know the
|_____|/ |_|/ |_____|/ | reason it was put up.
|
| 528.137 | Mars Observer Update -- 03/24/93 | PONIL::J_BUTLER | E pur, si muove... | Thu Mar 25 1993 13:50 | 51 |
| Article 3340 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 03/24/93
Message-ID: <24MAR199323433637@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
March 24, 1993
3:00 PM PST
Spacecraft subsystems and the instrument payload are performing well in
Array Normal Spin and outer cruise configuration, with uplink and
downlink via the High Gain Antenna; uplink at 125 bps, downlink at the 2 K
Engineering data rate. The Gamma Ray Spectrometer and Magnetometer
instruments are powered on, but quiescent. The DSN (Deep Space Network)
is providing continuous coverage in support of Gravity Wave Experiment
activities.
The Gamma Ray Spectrometer Principal Investigator, W. Boynton,
presented an overview of science objectives and the instrument itself at
this morning's Mission Planning Team Meeting. Dr. Boynton also discussed
the GRS Team's plans for instrument annealing.
The Project Monthly Management Review took place this morning as a
video conference with NASA Headquarters Mars Observer Program
Management.
Uplink of the "Launch + 180 Days Star Catalog and Ephemeris" occurred at
4:06 PM yesterday, the USE command was sent at 4:52 PM.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Don't ever take a fence
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | down until you know the
|_____|/ |_|/ |_____|/ | reason it was put up.
|
| 528.138 | Mars Observer Update -- 03/29/93 | PONIL::J_BUTLER | E pur, si muove... | Mon Mar 29 1993 18:46 | 69 |
| Article 3363 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 03/29/93
Message-ID: <29MAR199317295777@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
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Lines: 50
Fowarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
March 29, 1993
All spacecraft subsystems and instrument payload are
performing well as the Mars Observer spacecraft begins to close
in on the red planet. Today the spacecraft is about 27 million
kilometers (17 million miles) from Mars, traveling at a velocity
of about 9,700 kilometers per hour (6,000 miles per hour) with
respect to Mars.
Surplus fuel reserves from good launch conditions will allow
ground controllers to use more propellent after Mars orbit
insertion (on Aug. 24, 1993) and drop the spacecraft more rapidly
into its low-altitude mapping orbit. Consequently, science
operations will start 21 days ahead of schedule, beginning on
Nov. 22, 1993, rather than Dec. 12, 1993.
The mission operations team will use a "power in" approach
to speed the spacecraft's descent and ensure that data collection
is well under way before two natural events occur: a December
1993 solar conjunction that will block spacecraft communications,
and the beginning of the Martian dust storm season in February
1994. Spacecraft descent using the "power in" strategy will take
75 days rather than 96 days, and require seven braking maneuvers
to bring the spacecraft into its 2 p.m. solar orientation. The
spacecraft will reach its mapping orbit 378 kilometers (249
miles) above the surface of Mars on Nov. 8, 1993.
The spacecraft will be able to complete one mapping cycle of
the Martian surface -- which takes 26 days -- before the solar
conjunction begins on Dec. 20, 1993. The conjunction will last
through Jan. 3, 1994 and will create a "command moratorium,"
during which time all commands to the spacecraft will be
suspended.
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Don't ever take a fence
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | down until you know the
|_____|/ |_|/ |_____|/ | reason it was put up.
|
| 528.139 | Mars Observer Update #2 -- 03/29/93 | PONIL::J_BUTLER | E pur, si muove... | Mon Mar 29 1993 20:42 | 50 |
| Article 3364 of sci.space.news:
Newsgroups: sci.space.news
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update #2 - 03/29/93
Message-ID: <29MAR199320545366@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
March 29, 1993
11:30 AM PST
Spacecraft subsystems and the instrument payload are performing well in
Array Normal Spin and outer cruise configuration, with uplink and
downlink via the High Gain Antenna; uplink at 125 bps, downlink at the 2 K
Engineering data rate. The Gamma Ray Spectrometer and Magnetometer
instruments are powered on, but quiescent. The DSN (Deep Space Network)
is providing continuous coverage in support of Gravity Wave Experiment
activities.
Spacecraft activity is minimal through completion of the Gravity Wave
Experiment. The Flight Team is conducting an "Anomalous Mars Orbit
Insertion" training rehearsal during this period.
Verification Test Laboratory testing of Flight Software Build 8.0 began on
Tuesday, March 23 and continues through April 5.
Work is in progress on the Preliminary T1 Flight Sequence, which contains
the Mars Orbit Insertion maneuver. A Preliminary T1 Sequence approval
meeting is scheduled for Monday, April 19.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Don't ever take a fence
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | down until you know the
|_____|/ |_|/ |_____|/ | reason it was put up.
|
| 528.140 | Mars Observer Update -- 04/05/93 | PONIL::J_BUTLER | E pur, si muove... | Mon Apr 05 1993 22:35 | 49 |
| Article 3420 of sci.space.news:
Newsgroups: sci.space.news
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 04/05/93
Message-ID: <5APR199317263849@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
Keywords: Mars Observer, JPL
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
April 5, 1993
10:00 AM PDT
Flight Sequence C8 is active, the Spacecraft subsystems and instrument
payload performing well in Array Normal Spin and outer cruise
configuration, with uplink and downlink via the High Gain Antenna; uplink
at 125 bps, downlink at the 2 K Engineering data rate. Continuous
coverage in support of the Gravity Wave Experiment is being provided by
the Deep Space Network.
Spacecraft activity is minimal through completion of the Gravity Wave
Experiment next week. The Flight Team is conducting an "Anomalous Mars
Orbit Insertion" training rehearsal during this period.
Verification Test Laboratory testing of Flight Software Build 8.0 began on
Tuesday, March 23 and is scheduled to complete today.
Work is in progress on the Preliminary T1 Flight Sequence, which contains
the Mars Orbit Insertion maneuver. A Preliminary T1 Sequence approval
meeting is scheduled for Monday, April 19.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Being cynical never helps
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | to correct the situation
|_____|/ |_|/ |_____|/ | and causes more aggravation
| instead.
|
| 528.141 | Mars Observer Update -- 04/09/93 | PONIL::J_BUTLER | E pur, si muove... | Tue Apr 13 1993 16:47 | 71 |
| Article 3463 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 04/09/93
Message-ID: <9APR199319544171@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
April 9, 1993
11:20 AM PDT
The spacecraft was commanded to the 4 kbs Science and Engineering
downlink data rate this morning. This was the first step in a series of
activities affecting Gamma Ray Spectrometer, Electron Reflectometer,
and Pressure Modulator Infrared Radiometer instruments planned for
today.
While at the 4k downlink rate, the GRS team will be examining the GRS
Ram load to verify content, the MAG/ER team is performing instrument
calibration activities, and the PMIRR team is using the opportunity to
update an auxiliary heater state indicator time tag. Upon completion of
these activities, the spacecraft will be commanded back to the 2k
downlink Engineering data rate.
MO participation in the Gravity Wave Experiment ends at 1:20 AM Monday,
April 12. The active Flight Sequence, C8, will then execute steps to begin
further Magnetometer instrument calibrations to allow the instrument
team to better characterize the spacecraft-generated magnetic field and
its effect on their instrument. This information is critical to Martian
magnetic field measurements which occur during approach and mapping
phases. Magnetometer calibrations performed Monday through Wednesday
(April 12 through 14) will require the sequence to command the spacecraft
out of Array Normal Spin state and perform slew and roll maneuvers to
provide the MAG team data points in varying spacecraft attitudes and
orientations. The sequence will perform the transition back to Sun Star
Init at 7:21 on Tuesday, April 13. With Inertial Reference reestablished,
the spacecraft will be commanded to slew to Array Normal Spin at 10:31 AM.
Concurrent with MAG Calibration activities, the Mars Observer Camera
team will power on their instrument and take Wide Angle and Narrow
Angle images. Wide Angle imaging will be performed while the spacecraft
is in the Inertial Slew Hold mode. Narrow Angle imaging will be performed
after the Spacecraft has been returned to ANS, and the planet Jupiter is in
the Narrow Angle field of view. These activities are executed by non-
stored sequence commands and will be closely coordinated between
Instrument, Spacecraft, and Ground Operations Teams.
Verification Test Laboratory testing of Flight Software Build 8.0 began on
Tuesday, March 23 and is scheduled to be completed May 5. An earlier
report erroneously stated the completion date to be April 5.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Being cynical never helps
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | to correct the situation
|_____|/ |_|/ |_____|/ | and causes more aggravation
| instead.
|
| 528.142 | Mapping Mission to Start Early | PONIL::J_BUTLER | E pur, si muove... | Tue Apr 13 1993 16:48 | 108 |
| Article 3467 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Mapping Mission to Begin Earlier Than Planned
Message-ID: <9APR199320185422@kelvin.jpl.nasa.gov>
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From the "JPL Universe"
April 9, 1993
Mars Observer mapping mission to begin earlier than planned
By Diane Ainsworth
The Mars Observer spacecraft will begin its mapping mission
about three weeks sooner than planned to ensure that data
collection is well under way before Martian dust storms begin to
sweep over the planet in February 1994.
Plans to begin the science experiments on Nov. 22, 1993,
rather than Dec. 12, had been written into the baseline strategy
for the mission, but could not be considered until fuel surplus
after launch and the first trajectory correction maneuver had
been determined, project officials said. The Mars Observer
planetary science group ratified the decision in mid-February to
begin science observations 21 days ahead of schedule.
"We had ideal launch conditions," said Suzanne Dodd, Mars
Observer mission planning team chief, "and the Titan III launch
vehicle and Transfer Orbit Stage (TOS) booster performed so
efficiently that we conserved enough fuel to begin the mission
early."
The spacecraft will use the "power in" approach to drop more
rapidly into its final, two-hour mapping orbit, Dodd said.
Spacecraft descent from the time of capture in Mars orbit until
it reaches the mapping orbit will take 75 days rather than 96
days, and will require seven braking maneuvers to bring the
spacecraft into its 2 p.m. solar orientation.
The spacecraft's booms will not be fully deployed until the
final polar orbit has been achieved, Dodd said, but some science
experiments will be operating as the highly elliptical orbit
begins to tighten around the planet.
The Magnetometer and Gamma Ray Spectrometer -- mounted on
separate booms -- will be able to make unique measurements of the
interactions of magnetic field lines with the solar wind that
will not be observable from the lower altitude mapping orbit,
said Dr. Arden Albee, Mars Observer project scientist.
"For the first 10 1/2 days, the spacecraft will be crossing
in and out of the planet's magnetic field in a three-day
elliptical orbit," Albee said. "This will be a critical period
for Magnetometer and Gamma Ray Spectrometer calibrations. Noise
from the spacecraft will have to be subtracted out from the
magnetic signatures of Mars and that can only be done as the
spacecraft moves closer and then farther away from this planetary
boundary."
Twenty-one days after orbit insertion, the spacecraft will
be in a one-day orbit around the planet. The Deep Space Network
will begin to track the spacecraft continuously and, using the
Doppler shift, measure the Martian gravity field.
The Thermal Emission Spectrometer and Mars Observer Camera
may also be operated simultaneously during spacecraft descent,
Dodd said. Those instruments had not yet been approved for
operation when Universe went to press, but a decision was
expected within a few weeks. The camera, which will have taken
its first picture of the planet 28 days before orbit insertion,
would be turned on to begin acquiring narrow-angle images of star
fields and the limb of the Martian surface.
Mission operations team members said a solar conjunction
that will occur on Dec. 20, 1993, and last through Jan. 3, 1994,
also prompted the decision to begin science operations early.
During the conjunction, the sun will be between Earth and the
spacecraft, blocking spacecraft communications.
"From an operational standpoint, we wanted to make sure that
all orbit maneuvers and boom deployments were completed before we
lost communication with the spacecraft," Dodd said. "On the
science side, one complete mapping cycle takes 26 days, so we
wanted to have one nice, clear map of Mars before solar
conjunction."
"There is a very distinct advantage to getting this first
mapping cycle right up front," Albee added. "The Martian dust
storms run roughly between February and August, so the atmosphere
should be very clear in November. It will also provide us with an
excellent opportunity to obtain data before and after a dust
storm."
Mars Observer will reach its near-circular mapping orbit 378
kilometers (234 miles) above the planet's surface on Nov. 8 of
this year. At that time, the last two solar panels will be
deployed and the science booms will be fully extended. In its
mapping configuration, the spacecraft will map the red planet for
an entire Martian year, the equivalent of about two Earth years
or 687 Earth days.
###
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Being cynical never helps
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | to correct the situation
|_____|/ |_|/ |_____|/ | and causes more aggravation
| instead.
|
| 528.143 | Mars Observer Update -- 04/12/93 | PONIL::J_BUTLER | E pur, si muove... | Tue Apr 13 1993 16:49 | 38 |
| Article 3487 of sci.space.news:
Newsgroups: sci.space.news
Path: nntpd2.cxo.dec.com!pa.dec.com!decwrl!elroy.jpl.nasa.gov!ames!dont-send-mail-to-path-lines
From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 04/12/93
Message-ID: <12APR199321210297@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
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MARS OBSERVER STATUS REPORT
April 12, 1993
At 19:39Z on April 9, 1993, DSS-65 (Mardid 34 meter antenna) lost the
receiver lock from the Mars Observer spacecraft without any warning.
The 34 meter antennas at Goldstone (DSS-12 and DSS-15) were brought up
to search for the downlink signal. The downlink was found by DSS-65 from the
spacecraft's LGA (Low Gain Antenna). After the telemetry locked up at
10 bps, the project determined that the spacecraft was in safe mode and
was sun coning. The project uplinked over DSS-15 and changed the command
rate back to 125 bps. No spacecraft emergency was declared and the cause
of the safe mode is under investigation.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Being cynical never helps
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | to correct the situation
|_____|/ |_|/ |_____|/ | and causes more aggravation
| instead.
|
| 528.144 | Mars Observer Update -- 04/13/93 | PONIL::J_BUTLER | E pur, si muove... | Thu Apr 15 1993 13:27 | 66 |
| Article 3492 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Mars Observer Update - 04/13/93
Keywords: Mars Observer, JPL
Message-ID: <13APR199318430064@kelvin.jpl.nasa.gov>
Date: 13 Apr 93 18:43:00 GMT
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
April 13, 1993
On day 99 (April 9) at UTC 19:38, the DSN (Deep Space Network) lost lock on
the spacecraft and no carrier was detected. Examination of telemetry just
prior to the LOS (Loss of Signal) indicated that the spacecraft had an X-axis
reaction wheel crossing event followed by a Starex reset and a subsequent star
transit. At DOY 99/20:29, the DSN reported a low signal level, consistent
with the Aux Osc frequency, and the ACE was requested to implement procedures
for configuration for 10 bps downlink. At 99/22:19 the spacecraft signal was
locked up on 10 bps downlink and it was confirmed that the spacecraft had
entered Contingency Mode. Telemetry revealed that all subsystems were
nominal in this configuration and that no hardware problems existed. The
Contingency Mode Recovery procedure was initiated to start the process to
reestablish inertial reference.
On Friday evening, the spacecraft was reconfigured for an uplink rate of 125
bps and commands were sent to retrieve memory content readouts. Audit Queue
and Starex Compool readouts provided sufficient information to determine that
the anomaly occured as a result of a combination of reaction wheel crossing
stiction, a Starex Reset and an erroneous star identification happening almost
simultaneously. The spacecraft reacted to this with an attitude correction of
1.9 degrees. With a sun sensor resolution of 0.5 degrees, the spacecraft thus
assumed a value greater than 2 degrees and hence failed the 2 degree Sun
Monitor Ephemeris check.
Recovery is underway and it is expected that the spacecraft will be back in
Array Normal Spin by the end of day Tuesday, DOY 103 (April 13). The payload
operations will be restored and commands will be processed to perform the MOC
(Mars Observer Camera) imaging of Jupiter as that planet traverses through the
Mars Observer field of view on Wednesday, DOY 104. The MAG/ER (Magentometer/
Electron Reflectometer) calibrations that were in the C8 sequence before
falling into Contingency Mode is being evaluated and efforts are underway for
inclusion of this calibration into either the C10 or C11 sequence.
At the time of this report, the spacecraft has achieved inertial reference in
the Sun Star Init mode and recovery is proceeding well. New star catalogs will
be transmitted to the spacecraft today for L + 201 (Launch+201 days).
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Being cynical never helps
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | to correct the situation
|_____|/ |_|/ |_____|/ | and causes more aggravation
| instead.
|
| 528.145 | Mars Observer Updates 1 & 2 -- 04/14/93 | PONIL::J_BUTLER | E pur, si muove... | Thu Apr 15 1993 13:28 | 121 |
| Article 3498 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 04/14/93
Message-ID: <14APR199320354257@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
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Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
April 14, 1993
All spacecraft subsystems are performing well as Mars
Observer heads for a rendezvous with the Red Planet on Aug. 24,
1993.
The spacecraft experienced a slight attitude change on
Friday, April 9, when an internal software test failed and
erroneously indicated that inertial reference had been lost. When
this happened, on-board fault protection initiated a "contingency
mode," which automatically switched spacecraft communications
from the high-gain to the low-gain antenna. Data rates and power
consumption were reduced, and the solar arrays were repositioned
to a more favorable orientation toward the sun.
The incident has occurred before and ground controllers
understand it. No hardware problems are involved and the
spacecraft performed flawlessly in switching to the contingency
mode. A command sequence to modify on-board software will be
uplinked in late May. Meanwhile, the spacecraft was returned to
normal cruise configuration late Tuesday, April 13. A
magnetometer calibration sequence that would have occurred during
the recovery period was postponed until May.
The camera team began a series of narrow-angle and wide-
angle imaging tests on Tuesday afternoon, and photographed
Jupiter while it was in the camera's field of view Tuesday night.
The camera tests were executed by non-stored sequence commands
that were closely coordinated by instrument, spacecraft and
ground operations teams.
The gravitational wave experiment using Mars Observer and
two other interplanetary spacecraft -- Galileo and Ulysses --
also concluded this week, on Monday, April 12, at about 1:20 a.m.
Pacific Daylight Time. The radio science team will spend a
minimum of six months analyzing the data. Results may be
forthcoming by fall or winter 1993.
Today the Mars Observer spacecraft is about 25 million
kilometers (15 million miles) from Mars and 178 million
kilometers (111 million miles) from Earth. The spacecraft is
traveling at a velocity of about 8,200 kilometers per hour (5,000
miles per hour) with respect to Mars.
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Being cynical never helps
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | to correct the situation
|_____|/ |_|/ |_____|/ | and causes more aggravation
| instead.
Article 3499 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update #2 - 04/14/93
Message-ID: <14APR199320371244@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
April 14, 1993
The spacecraft has been fully recovered to Array Normal Spin and all
subsystems are performing nominally. The downlink rate was been
reestablished at 2kbps in the Engineering mode with an uplink rate of 125
bps. Sequence C8 has been stopped. Commands were sent to acquire
MOC (Mars Observer Camera) images of Jupiter Tuesday evening. The MAG/ER
(Magnetometer/Electron Reflectometer) calibration is currently being studied
for inclusion into the C9 sequence, which may be delayed for approximately 1
week to accommodate the calibration. The PDS (Payload Data Subsystem)
and GRS (Gamma Ray Spectrometer) memories are planned to be loaded later
today.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Being cynical never helps
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | to correct the situation
|_____|/ |_|/ |_____|/ | and causes more aggravation
| instead.
|
| 528.146 | Mars Observer Update -- 04/15/93 | TINCUP::J_BUTLER | E pur, si muove... | Mon Apr 19 1993 15:49 | 54 |
| Article 3507 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 04/15/93
Message-ID: <15APR199321193353@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
April 15, 1993
The spacecraft remains stable with communications established on
the High Gain Antenna at 125 bits per second uplink and 4 kilo bits
per second downlink while supporting MOC (Mars Observer Camera) star
imaging. The battery management and Starex have both been activated
onboard the spacecraft.
Commands have been processed for uplink to turn off the MOC
today and to turn TWNC (two way noncoherent) off to allow for
coherent ranging data for Navigation purposes. The spacecraft will
be commanded to 250 bits per second downlink late today to support
a request by Galileo to perform an Advanced Systems Telemetry
Array Demonstration using DSS-14 and DSS-15 (Goldstone 70 and 34 meter
antennas).
Planning is underway to perform delta-DOR (Differential One-way Ranging)
observations this weekend and to load the PDS (Payload Data Subsystem) and
GRS (Gamma Ray Spectrometer) memories early next week. The Magnetometer
and Electron Reflectometer calibration is currently being developed for
inclusion into the C9 sequence, which is currently planned to be uploaded
during the early part of the week of April 26th.
The spacecraft team reports that all subsystems continue to be
nominal and perform well.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Being cynical never helps
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | to correct the situation
|_____|/ |_|/ |_____|/ | and causes more aggravation
| instead.
|
| 528.147 | Mars Observer Update -- 04/16/93 | TINCUP::J_BUTLER | E pur, si muove... | Mon Apr 19 1993 15:50 | 48 |
| Article 3513 of sci.space.news:
Newsgroups: sci.space.news
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 04/16/93
Message-ID: <16APR199318475759@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
April 16, 1993
Spacecraft bus recovery from Contingency Mode has been completed
and all subsystems are nominal. The payload recovery is in process;
the PDS (Payload Data Subsystem) and GRS (Gamma Ray Spectrometer)
RAM loads will occur early next week.
The TWNC OFF (Two Way Non-Coherent) commands were sent and the
ground is now acquiring 2-way Doppler tracking data to support
Navigation. The MOC (Mars Observer Camera) has been powered off and
its replacement heater powered on. A command will be sent tonight
to set the downlink telecom rate to S&E1 at 4kbps. Efforts are
underway to recover the MAG/ER (Magnetometer/Electron Reflectometer)
calibration in the C9 sequence, which has been slipped approximately
one week.
The GDS (Ground Data Systems) transition to MOSO version 18.0 is in
process and will continue for the next month; the transition plan
allows for complete support to Flight System activities throughout
the duration of the transition period.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The aweto from New Zealand
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | is part caterpillar and
|_____|/ |_|/ |_____|/ | part vegetable.
|
| 528.148 | Mars Observer Update -- 04/23/93 | PONIL::J_BUTLER | E pur, si muove... | Mon Apr 26 1993 13:45 | 67 |
| Article 3547 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 04/23/93
Message-ID: <23APR199320353189@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
April 23, 1993
10:00 AM PDT
Flight Sequence C8 is active, the Spacecraft subsystems and instrument
payload performing well in Array Normal Spin and outer cruise
configuration, with uplink and downlink via the High Gain Antenna; uplink
at 125 bps, downlink at the 2 K Engineering data rate.
As a result of the spacecraft entering Contingency Mode on April 9, all
payload instruments were automatically powered off by on-board fault
protection software. Gamma Ray Spectrometer Random Access Memory
was successfully reloaded on Monday, April 19. To prepare for
Magnetometer Calibrations which were rescheduled for execution in Flight
Sequence C9 on Tuesday and Wednesday of next week, a reload of Payload
Data System Random Access Memory will take place this morning
beginning at 10:30 AM.
Over this weekend, the Flight Team will send real-time commands to
perform Differential One-Way Ranging to obtain additional data for
analysis by the Navigation Team. Radio Science Ultra Stable Oscillator
testing will take place on Monday .
The Flight Sequence C9 uplink will occur on Sunday, April 25, with
activation at Midnight, Monday evening April 26. C9 has been modified to
include Magnetometer Calibrations which could not be performed in C8 due
to Contingency Mode entry on April 9. These Magnetometer instrument
calibrations will allow the instrument team to better characterize the
spacecraft-generated magnetic field and its effect on their instrument.
This information is critical to Martian magnetic field measurements
which occur during approach and mapping phases. MAG Cals will require
the sequence to command the spacecraft out of Array Normal Spin state
and perform slew and roll maneuvers to provide the MAG team data points
in varying spacecraft attitudes and orientations.
Today, the spacecraft is 22,971,250 km (14,273,673 mi.) from Mars
travelling at a velocity of 2.09 kilometers/second (4,677 mph) with
respect to Mars. One-way light time is approximately 10 minutes, 38
seconds.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The aweto from New Zealand
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | is part caterpillar and
|_____|/ |_|/ |_____|/ | part vegetable.
|
| 528.149 | Mars Observer Update -- 04/26/93 | PONIL::J_BUTLER | E pur, si muove... | Tue Apr 27 1993 13:43 | 48 |
| Article 3598 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 04/26/93
Message-ID: <26APR199323173522@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
April 26, 1993
3:00 PM PDT
Spacecraft subsystems and the instrument payload are performing well in
Array Normal Spin and outer cruise configuration, with uplink and
downlink via the High Gain Antenna; uplink at 125 bps, downlink at the 4 K
Science and Engineering data rate.
Flight Sequence C9 uplink occurred as planned on Sunday, April 25, with
scheduled activation at 0011 Tuesday morning April 27. The key
component of C9 are Magnetometer Instrument calibrations intended to
allow the instrument team to better characterize the spacecraft-
generated magnetic field and its effect on their instrument. MAG Cals will
require the sequence to command the spacecraft out of Array Normal Spin
state and perform slew and roll maneuvers to provide the MAG team data
points in varying spacecraft attitudes and orientations. MAG Cal activities
will begin at 5:30 AM on Tuesday and continue through 4:30 AM on Friday,
April 30. The Flight Team will be on station on a 24 hour basis throughout
this period.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The aweto from New Zealand
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | is part caterpillar and
|_____|/ |_|/ |_____|/ | part vegetable.
|
| 528.150 | Mars Observer Update -- 04/28/93 | CXDOCS::J_BUTLER | E pur, si muove... | Thu Apr 29 1993 14:43 | 59 |
| Article 3624 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 04/28/93
Message-ID: <28APR199322480688@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
April 28, 1993
12:40 PM PDT
Flight Sequence C9 is active as of 00:11 AM, Tuesday, April 27. With
activities beginning at shortly before 5:00 AM yesterday, C9 commanded
the spacecraft to execute a series of slews and rolls to provide the MAG
(Magnetometer) Team data points in varying spacecraft attitudes and
orientations for the purpose of better characterizing the
spacecraft-generated magnetic field and its effect on their instrument.
The spacecraft was commanded back to Sun Star Init state at 9:07 AM to
re-establish Inertial Reference. Transition back to Array Normal Spin
began at 11:17 AM, after which the sequence powered on the on-board
transmitter at 11:18 AM. Telemetry reacquisition occurred at
approximately 11:30 AM at the 4 KBS Science and Engineering downlink
data rate on the High Gain Antenna. Subsystem engineers report that all
systems appear to be nominal. The command to terminate using the Low
Gain Antenna for uplink was sent at 12:31 PM. Uplink and Downlink are
currently via the HGA.
MAG Calibration data has been recorded on Digital Tape Recorders 2 and 3.
Playback of DTR 2 is scheduled to take place tomorrow morning between
8:11 AM and 12:42 PM. Playback of DTR 3 is scheduled to take place
tomorrow evening beginning at 11:57 PM and ending at 4:28 AM on Friday.
DTR playback will be performed via the High Gain Antenna at 42,667 bits
per second. Upon verification of successful DTR playbacks, downlink will
be maintained at the 4K S & E rate.
The MAG Cal activity timeline ends at shortly before 5:00 AM on Friday
morning.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The aweto from New Zealand
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | is part caterpillar and
|_____|/ |_|/ |_____|/ | part vegetable.
|
| 528.151 | Mars Observer Updates -- 04/30/93 | PONIL::J_BUTLER | E pur, si muove... | Mon May 03 1993 14:39 | 94 |
| Article 3639 of sci.space.news:
Newsgroups: sci.space.news
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 04/30/93 (Safe Mode)
Message-ID: <30APR199315512743@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
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MARS OBSERVER STATUS REPORT
April 30, 1993
The Mars Observer spacecraft went into safe mode on April 29, 1993, at
1305Z while being tracked by DSS-65 (Madrid 34 meter antenna). Currently,
the spacecraft is sun coning with downlink AGC (Automatic Gain Control)
functuating from -158 to -165 with the telemetry bit rate at 10 bps coded.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The aweto from New Zealand
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | is part caterpillar and
|_____|/ |_|/ |_____|/ | part vegetable.
Article 3643 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 04/30/93
Message-ID: <30APR199320580310@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
April 30, 1993
11:30 AM PDT
DSS-65 (Madrid 34 meter antenna) did not acquire the expected Mars Observer
Spacecraft signal at the scheduled beginning of track yesterday morning (4/29)
at approximately 6:00 AM. Indications were that the spacecraft had entered a
Fault Protection mode sometime between that time and receipt of normal
telemetry at the end of the previous station pass (DSS-15 - Goldstone 34
meter antenna) at approximately 8:00 PM the evening before. Entry into
Contingency Mode was verified when signal was reacquired and telemetry
indicated that the spacecraft was sun coning. After subsystem engineers
reported all systems performing nominally, fault protection telemetry modes
were reconfigured and memory readouts of command system Audit Queue and
AACS (Attitude and Articulation Control Subsystem) Starex performed. These
readouts verified that Contingency Mode entry occurred shortly after 1:30 AM
yesterday, 4/29/93. Preliminary indications are that a Sun Ephemeris Check
failure triggered fault protection. However, the Flight Team will be
determining the precise cause over the next few days.
As of last evening, the spacecraft had been commanded back to Inertial
Reference and was stable in that mode. The Flight Team is planning to
command the spacecraft back to Array Normal Spin state today.
Magnetometer Calibration activities had completed prior to Contingency
Mode entry. MAG Calibration data has been recorded on Digital Tape
Recorders 2 and 3. Playback of DTRs 2 and 3, scheduled to be completed
yesterday, was postponed when Contingency Mode entry halted Flight
Sequence C9 execution. The Flight Team is developing a strategy to restart
C9 to complete data playback. Present planning is to perform playbacks
between as soon as Wednesday, or as late as Friday of next week (5/5-
5/7), dependent on Contingency Mode recovery activity. DTR playback will
be performed via the High Gain Antenna at 42,667 bits per second. Upon
verification of successful DTR playbacks, downlink will be maintained at
the 4K S & E rate.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The aweto from New Zealand
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | is part caterpillar and
|_____|/ |_|/ |_____|/ | part vegetable.
|
| 528.152 | Another Mars Observer Update -- 04/30/93 | PONIL::J_BUTLER | E pur, si muove... | Tue May 04 1993 13:41 | 69 |
| Article 3673 of sci.space.news:
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From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update #2 - 04/30/93
Message-ID: <3MAY199322045163@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
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Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
April 30, 1993
The Mars Observer spacecraft switched to an automatic fault
protection mode, called "contingency mode," at approximately 1:30
a.m. Pacific Daylight Time on Thursday, April 29. Ground-
controllers at JPL discovered the situation at 6 a.m. PDT, when
the Madrid Deep Space Network facility did not receive the
expected spacecraft signal at the scheduled acquisition time.
All telemetry indications were normal at conclusion of the
preceding pass at Goldstone. At reacquisition, indications were
that the spacecraft was no longer in normal inertial reference
mode.
Contingency mode is designed to restore communications when
the spacecraft loses attitude reference and cannot point the
high-gain antenna at Earth. The reconfiguration automatically
switches spacecraft communications from the high-gain to the
low-gain antenna. Data rates are reduced and the solar arrays
are repositioned to a more favorable orientation toward the sun.
Preliminary indications suggest that the spacecraft lost inertial
reference to the sun, which triggered the fault protection mode.
The incident, which last occurred on April 9, 1993, is
understood and not considered serious. No hardware problems were
involved and the spacecraft performed perfectly in switching to
contingency mode. The Mars Observer flight team planned to
return the spacecraft to normal cruise mode today.
Today the Mars Observer spacecraft is about 22 million
kilometers (13.5 million miles) from Mars and 204 million
kilometers (127 million miles) from Earth. The spacecraft is
traveling at a velocity of about 7,200 kilometers per hour (5,000
miles per hour) with respect to Mars.
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Once a year, go someplace
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you've never been before.
|_____|/ |_|/ |_____|/ |
|
| 528.153 | Mars Observer Update -- 05/03/93 | PONIL::J_BUTLER | E pur, si muove... | Tue May 04 1993 13:45 | 52 |
| Article 3675 of sci.space.news:
Newsgroups: sci.space.news
Path: nntpd2.cxo.dec.com!pa.dec.com!decwrl!olivea!charnel!rat!usc!zaphod.mps.ohio-state.edu!saimiri.primate.wisc.edu!ames!dont-send-mail-to-path-lines
From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 05/03/93
Message-ID: <3MAY199323544436@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
Keywords: Mars Observer, JPL
Sender: digester@news.arc.nasa.gov
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
May 3, 1993
2:30 PM PDT
Spacecraft subsystems are performing well in Array Normal Spin and
outer cruise configuration, with uplink and downlink via the High Gain
Antenna; uplink at 125 bps, downlink at the 4 K Science and Engineering
data rate.
The spacecraft was commanded back to Array Normal Spin state at
approximately 2:58 PM Friday. Flight Sequence C9, which was active at the
time of entry into Contingency Mode early Thursday, is to be updated by a
revised sequence designated "C9R". A schedule has been developed for
sequence revision, sequence generation activities, sequence approval
uplink, and activation. The current timeline has the uplink taking place in
a window beginning at 9:00 PM on Tuesday, 5/4, and ending Wednesday,
5/5 at 5:00 AM. Sequence activation is scheduled for 2 PM on Wednesday.
Playback of DTR 1 (Digital Tape Recorder 1) is also planned for Wednesday
afternoon from 3:20 PM to 10:50 PM during the scheduled Goldstone pass.
Playback of DTR 2 is planned for Friday, 5/7 from 7:50 AM through 4:15 PM
during Madrid coverage.
Uplink of Flight Sequence C10 is planned to take place Friday in a window
extending from 4:15 PM through 5:00 PM.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Once a year, go someplace
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you've never been before.
|_____|/ |_|/ |_____|/ |
|
| 528.154 | Mars Observer Update #2 -- 05/03/93 | PONIL::J_BUTLER | E pur, si muove... | Tue May 04 1993 19:01 | 56 |
| Article 3679 of sci.space.news:
Newsgroups: sci.space.news
Path: nntpd2.cxo.dec.com!pa.dec.com!decwrl!ames!dont-send-mail-to-path-lines
From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update #2 - 05/03/93
Message-ID: <4MAY199315533677@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
Keywords: Mars Observer, JPL
Sender: digester@news.arc.nasa.gov
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Date: Tue, 4 May 1993 15:53:00 GMT
Approved: sci-space-news@ames.arc.nasa.gov
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Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
May 3, 1993
The Mars Observer spacecraft was returned to normal cruise
mode at 3:15 p.m. Friday, April 30, 1993, after spending about 38
hours in a fault protection mode known as "contingency mode." In
contingency mode, the spacecraft automatically switches from the
high-gain to the low-gain antenna and repositions itself to a
more favorable orientation toward the sun.
No hardware problems were involved in the incident and the
spacecraft performed perfectly in switching to contingency mode.
JPL's flight engineering team will continue to study the problem
until an adequate software fix can be designed and uplinked.
Today Mars Observer is about 21 million kilometers (13
million miles) from Mars and about 209 million kilometers (130
million miles) from Earth. The spacecraft is traveling at a
velocity of about 7,200 kilometers per hour (4,500 miles per
hour) with respect to Mars.
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Once a year, go someplace
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you've never been before.
|_____|/ |_|/ |_____|/ |
|
| 528.155 | Mars Observer Update -- 05/06/93 | PONIL::J_BUTLER | E pur, si muove... | Fri May 07 1993 14:58 | 49 |
| Article 3706 of sci.space.news:
Newsgroups: sci.space.news
Path: nntpd2.cxo.dec.com!pa.dec.com!decwrl!ames!dont-send-mail-to-path-lines
From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 05/06/93
Message-ID: <6MAY199322041690@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
Keywords: Mars Observer, JPL
Sender: digester@news.arc.nasa.gov
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Organization: Jet Propulsion Laboratory
Date: Thu, 6 May 1993 22:04:00 GMT
Approved: sci-space-news@ames.arc.nasa.gov
Lines: 30
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
May 6, 1993
2:00 PM PDT
Flight Sequence C9R is active. C9R replaces that portion of sequence C9
that was halted due to Contingency Mode entry on April 28 and performs
payload activation functions.
C9R has to date powered on Magnetometer/Electron Reflectometer and
Gamma Ray Spectrometer instruments, and the Payload Data System, all of
which were shut down as part of planned fault protection measures at the
time of Contingency Mode entry.
Digital Tape Recorder 2, which contains data recorded during
Magnetometer calibrations last week, was played back yesterday and is
being played back for a second time today at 21.3 kbps via the High Gain
Antenna. Upon completion of playback, downlink will be maintained at the
4 kbps Science and Engineering data rate.
Uplink of Flight Sequence C10 is planned to take place Friday in a window
opening at 4:15 PM.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Once a year, go someplace
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you've never been before.
|_____|/ |_|/ |_____|/ |
|
| 528.156 | Mars Observer Updates 1 & 2 -- 05/10/93 | PONIL::J_BUTLER | E pur, si muove... | Tue May 11 1993 13:35 | 125 |
| Article 3723 of sci.space.news:
Newsgroups: sci.space.news
Path: nntpd2.cxo.dec.com!pa.dec.com!decwrl!ames!dont-send-mail-to-path-lines
From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 05/10/93
Message-ID: <10MAY199323345722@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
Keywords: Mars Observer, JPL
Sender: digester@news.arc.nasa.gov
Nntp-Posting-Host: kelvin.jpl.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Mon, 10 May 1993 23:34:00 GMT
Approved: sci-space-news@ames.arc.nasa.gov
Lines: 48
Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
May 10, 1993
The Mars Observer spacecraft again switched into contingency
mode -- a self-protective default mode -- at about 4:57 a.m.
Pacific Daylight Time on Sunday, May 9, 1993. Flight controllers
at JPL have decided to evaluate some software modifications that
will improve the spacecraft's attitude control performance before
returning to the normal outer cruise mode.
Contingency mode occurs when the spacecraft is unable to
correctly identify its position in space with respect to certain
stars and the sun. Specifically, the spacecraft's sun sensor
indicates that the position of the sun is not in the same
location as its on-board flight software expects it to be. When
that happens, the spacecraft thinks it has lost its attitude
reference and automatically points at the sun, throwing the high-
gain antenna off target with Earth. Communications are
automatically switched from the high-gain to the low-gain
antenna. All unnecessary power loads, such as the science
instruments and tape recorders, are turned off.
A software fix that will redefine some attitude control
parameters is being evaluated by JPL systems engineers. That
software was expected to be ready for uplink in the next several
weeks.
Today Mars Observer is about 20 million kilometers (12.5
million miles) from Mars and 220 million kilometers (136 million
miles) from Earth. The spacecraft is traveling at a velocity of
about 7,000 kilometers per hour (4,000 miles per hour) with
respect to Mars.
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Once a year, go someplace
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you've never been before.
|_____|/ |_|/ |_____|/ |
Article 3724 of sci.space.news:
Newsgroups: sci.space.news
Path: nntpd2.cxo.dec.com!pa.dec.com!decwrl!ames!dont-send-mail-to-path-lines
From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update #2 - 05/10/93
Message-ID: <10MAY199323364930@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
Keywords: Mars Observer, JPL
Sender: digester@news.arc.nasa.gov
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Organization: Jet Propulsion Laboratory
Date: Mon, 10 May 1993 23:36:00 GMT
Approved: sci-space-news@ames.arc.nasa.gov
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Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
May 10, 1993
4:00 PM PDT
Uplink of Flight Sequence C10 took place Friday afternoon, May 7, at
approximately 4:00 PM. Verification received was that the sequence
loaded normally.
An Engineering Data Formatter/Payload Data System Interface anomaly
was seen at 8:58 AM on Saturday. The PDS repeatedly sent the same
engineering data packet due to a telemetry transfer packet problem.
Recovery is to reset the EDF by re-transmitting the telemetry rate
command.
The reload of Gamma Ray Spectrometer Random Access Memory was
underway at the time the PDS/EDF anomaly was noted, but completed
successfully despite the telemetry problem. The GRS RAM Load used an
abridged load strategy which did not uplink "fill" zeroes" into memory.
This reduced the time required for RAM load by almost 50%.
In a replay of previously encountered behavior, the spacecraft entered
Contingency Mode at 4:57 AM, Sunday morning, May 9. 10 bits per second,
Low Gain telemetry was acquired at Acquisition of Signal. Analysis by the
Flight Team shows that subsystems are in good condition and the Audit
Queue memory readout indicates the same characteristics as in previous C-
Mode entries.
The recovery strategy being implemented is to readout the Starex Compool
memory and re-establish Inertial Reference today by commanding the
spacecraft to Sun Star Init. The Flight Team will analyze the memory
dumps so as to fully understand on-board events leading up to C-Mode
entry, and to develop and test permanent fixes. Current planning is to
remain in Sun Star Init at least through Wednesday afternoon at which
time a schedule for complete recovery to Array Normal Spin will be
approved.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Once a year, go someplace
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you've never been before.
|_____|/ |_|/ |_____|/ |
|
| 528.157 | Mars Observer Update -- 05/13/93 | CXDOCS::J_BUTLER | E pur, si muove... | Thu May 13 1993 22:54 | 43 |
| Article: 1301
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space,sci.astro,alt.sci.planetary
Subject: Mars Observer Update - 05/13/93
Date: 13 May 1993 21:47 UT
Organization: Jet Propulsion Laboratory
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
May 13, 1993
2:00 PM PDT
Flight Team members are finalizing plans for recovering the spacecraft
which remains in Contingency mode since early Sunday, May 9. While the
capability to recover sooner has been available to the team, the
opportunity has been taken to better analyze memory readouts to
determine specific causes, and develop a permanent solution.
The Verification Test Laboratory (VTL) has been successful in replicating
the events leading up to the Good Friday (4/9/93) occurrence of C Mode
Entry. Flight Software and Attitude Control subsystem engineers have
proposed a solution which will prevent future occurrence of entry into C-
Mode as a result of the same set of events. That solution, which involves a
relatively minor parameter change in celestial body sensing software, is
being tested on the VTL, modified Realtime Application Interactive
Debugger, and Flight Software VAX. Depending on the results of that
testing, commands to recover to Array Normal Spin could be sent as soon
as tomorrow, Friday, May 14, or on Monday, May 16.
The MO Navigation Team Chief advises that the spacecraft trajectory has
not yet been negatively affected by the effects of solar wind producing a
"sailing" effect on the solar array while the spacecraft is sun-coning, so
as to require an additional trajectory correction maneuver (TCM). No TCM-4,
provided for in mission schedules but predicted to not be necessary based
on the accuracy of previous TCMs, appears to be required at this time.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Once a year, go someplace
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you've never been before.
|_____|/ |_|/ |_____|/ |
|
| 528.158 | Mars Observer Update -- 05/14/93 | CXDOCS::J_BUTLER | E pur, si muove... | Tue May 18 1993 13:52 | 39 |
| Article: 3752
Newsgroups: sci.space.news
From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 05/14/93
Sender: digester@news.arc.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Sat, 15 May 1993 04:43:00 GMT
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
May 14, 1993
4:30 PM PDT
Flight Team members have finalized plans and management has authorized
file creation for recovering the spacecraft to Array Normal Spin state.
That activity actually began this morning at shortly after 8:00 AM when
the command to reestablish Inertial Reference was sent. Verification of
successful execution of that command was received shortly afterward.
While the capability to recover sooner has been available to the team, the
opportunity has been taken to better analyze memory readouts to
determine specific causes, and develop a permanent solution.
The extra time spent on analysis has allowed AACS (Attitude and Articulation
Control Subsystem) and Flight Software engineers to develop and test a
solution to the problem that has caused several occurrences of entry into
Contingency Mode.
The current schedule is for the Starex Covariance change to be uplinked
beginning at about 7:00 AM on Monday, May 17. With verification of
successful performance of that change, activities to recover to Array
Normal Spin should be completed by late morning Monday.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Once a year, go someplace
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you've never been before.
|_____|/ |_|/ |_____|/ |
|
| 528.159 | Mars Observer Updates 1 & 2 -- 05/18/93 | CXDOCS::J_BUTLER | E pur, si muove... | Wed May 19 1993 16:29 | 105 |
| Article: 3765
Newsgroups: sci.space.news
From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 05/18/93
Sender: digester@news.arc.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Tue, 18 May 1993 16:38:00 GMT
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
May 18, 1993
9:00 AM PDT
Commanding to return the spacecraft to Array Normal Spin state was
completed at 11:43 PM last evening. After spending several hours working
to clear up a problem with spacecraft receipt of uplinked commands, the
Flight Team successfully uplinked the Starex software fix at 5:21 PM. The
command to go back to ANS was sent at 7:37 PM, and verification received
at 8:13 PM. ownlink was then set to the 2 kbps Engineering rate (uplink is
at 125 bps) via the HGA (High Gain Antenna). All subsystems are performing
well.
With ANS verified, commands were sent to enable nominal momentum
unloading, the Starex reset script, and the battery management script.
Attitude Control subsystem and Flight Software engineers believe that the
Starex fix uplinked last night will correct the conditions which had
caused the spacecraft to enter Contingency Mode on several occasions. The
Flight Team will be closely monitoring performance of celestial sensing
components to verify that desired results have been achieved. The
Verification Test Laboratory has shown that the change made will produce
more accurate star and solar referencing.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Never laugh at anyone's
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | dreams.
|_____|/ |_|/ |_____|/ |
Article: 3770
Newsgroups: sci.space.news
From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update #2 - 05/18/93
Sender: digester@news.arc.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Tue, 18 May 1993 22:11:00 GMT
Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
May 18, 1993
The Mars Observer spacecraft was returned to normal cruise
mode at about 8:15 p.m. Pacific Daylight Time on Monday, May 17,
eight days after the spacecraft automatically switched to a self-
protective mode on Sunday, May 9. While recovery from
contingency mode had been possible last week, the flight team
took the opportunity to more thoroughly analyze memory readouts
of the incident and develop a software fix that would improve the
spacecraft's attitude reference performance.
The software fix was sent at about 5:20 p.m. PDT Monday.
The fix involved a relatively minor parameter change to celestial
body sensing software. Using the upgraded flight software, the
spacecraft should be able to better identify its orientation in
space and prevent the switch-over to contingency mode that has
been occurring recently.
Contingency mode causes the spacecraft to automatically
point at the sun. While in that orientation, the solar array
also faces directly at the sun and is subject to the effects of
the solar wind. Had a much longer period of time elapsed,
perhaps four to five times longer than that experienced during
this contingency mode incident, the spacecraft's trajectory could
have been affected. The navigation team, however, reported
Monday that the spacecraft was still on course for arrival at
Mars on Aug. 24, 1993. At this time, the fourth trajectory
correction maneuver, which was planned as a backup maneuver to
correct any errors in the final trajectory to Mars, does not
appear to be necessary.
All spacecraft subsystems are operating well. The science
payload will be powered on now that the spacecraft has been
restored to normal cruise mode. Two-way communication also has
been reestablished using the high-gain antenna.
Today the spacecraft is about 19 million kilometers (11
million miles) from Mars and 232 million kilometers (144 million
miles) from Earth, traveling at a velocity of about 7,200
kilometers per hour (4,300 miles per hour) with respect to Mars.
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Never laugh at anyone's
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | dreams.
|_____|/ |_|/ |_____|/ |
|
| 528.160 | Mars Observer Update -- 05/21/93 | CXDOCS::J_BUTLER | E pur, si muove... | Mon May 24 1993 13:46 | 63 |
| Article 3784 of sci.space.news:
Newsgroups: sci.space.news
Path: nntpd2.cxo.dec.com!pa.dec.com!decwrl!ames!dont-send-mail-to-path-lines
From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 05/21/93
Message-ID: <21MAY199320213683@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
Keywords: Mars Observer, JPL
Sender: digester@news.arc.nasa.gov
Nntp-Posting-Host: kelvin.jpl.nasa.gov
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Date: Fri, 21 May 1993 20:21:00 GMT
Approved: sci-space-news@ames.arc.nasa.gov
Lines: 44
Forwarded from the Mars Observer Project
MARS OBSERER STATUS REPORT
May 21, 1993
11:00 AM PDT
The spacecraft is stable in Array Normal Spin. Communication is via the
High Gain Antenna; uplink at 125 bps, downlink is at the 4 kbps Science
and Engineering data rate. Indications are that all spacecraft subsystems
are performing well.
The Flight Team has been carefully monitoring Attitude Control subsystem
performance since return to ANS on Monday evening. The Gyro bias
estimates showed some instability Wednesday evening, apparently in
conjunction with nearly simultaneous Reaction Wheel Assembly zero
crossing and STAREX misidentified star counter resets. AACS (Attitude and
Articulation Control Subsystem) engineers feel that there is a good possibility
that a star was erroneously accepted and is analyzing the situation. It is
generally felt that this type of event would have been sufficient to cause the
spacecraft to lose inertial reference prior to the star processing software fix
made Monday evening.
The telemetry transition from 2kbps Engineering to 4kbps Science and
Engineering Mission mode telemetry yesterday was normal, indicating that
the Payload Data System/Engineering Data Formatter interface is
operating properly.
The Payload Data System, Gamma Ray Spectrometer, and
Magnetometer/Electron Reflectometer were powered on yesterday.
Telemetry indicates that they are performing well.
The Verification Test Laboratory (VTL) has been successful in replicating
the events leading up to the April 29 occurrence of Contingency Mode
Entry. Recreation of the problem in a test environment allows teams the
opportunity to confirm that the star processing software fix uplinked
earlier this week resolves the problems which had been causing recurring
fault protection activation.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Never laugh at anyone's
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | dreams.
|_____|/ |_|/ |_____|/ |
|
| 528.161 | Mars Observer Update -- 05/26/93 | CXDOCS::J_BUTLER | E pur, si muove... | Thu May 27 1993 14:31 | 48 |
| Article 3810 of sci.space.news:
Newsgroups: sci.space.news
Path: nntpd2.cxo.dec.com!pa.dec.com!decwrl!ames!dont-send-mail-to-path-lines
From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 05/26/93
Message-ID: <26MAY199320234130@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
Keywords: Mars Observer, JPL
Sender: digester@news.arc.nasa.gov
Nntp-Posting-Host: kelvin.jpl.nasa.gov
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Date: Wed, 26 May 1993 20:23:00 GMT
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Lines: 29
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
May 26, 1993
11:00 AM PDT
The spacecraft is stable in Array Normal Spin. Communication is via the High
Gain Antenna; uplink at 125 bps, downlink is at the 2 kbps Engineering data
rate. Indications are that all spacecraft subsystems are performing well.
The Flight Team is uploading Flight Software Build 8.0 today and tomorrow.
Selected flight software modules are being updated to improve Attitude Control
subsystem performance. Related activities are scheduled to be completed by
tomorrow afternoon.
Gamma Ray Spectrometer Random Access Memory load activity begins late in the
afternoon on Saturday, May 29. That activity should complete about 8:00 PM
Saturday.
The Mars Observer Camera Mars Imaging Final Design Review was the subject of
Mission Manager's Operations Planning Meeting this morning. The scope of the
meeting was Mars imaging during approach.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Never laugh at anyone's
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | dreams.
|_____|/ |_|/ |_____|/ |
|
| 528.162 | Mars Observer Update -- 06/07/93 | CXDOCS::J_BUTLER | E pur, si muove... | Thu Jun 10 1993 14:40 | 50 |
| Article 3927 of sci.space.news:
Newsgroups: sci.space.news
Path: nntpd2.cxo.dec.com!pa.dec.com!decwrl!ames!dont-send-mail-to-path-lines
From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 06/07/93
Message-ID: <7JUN199321004428@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
Keywords: Mars Observer, JPL
Sender: digester@news.arc.nasa.gov
Nntp-Posting-Host: kelvin.jpl.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Mon, 7 Jun 1993 21:00:00 GMT
Approved: sci-space-news@ames.arc.nasa.gov
Lines: 31
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
June 7, 1993
2:00 PM PDT
The spacecraft is stable in Array Normal Spin. Communication is via the High
Gain Antenna in Mission Mode; uplink at 125 bps, downlink is at the 4 kbps
data rate. One Way Light Time is 14 minutes and 28 seconds. The Payload Data
System, Gamma Ray Spectrometer and Magnetometer/Electron Reflectometer are
powered on. GRS is operating from RAM. Indications are that all spacecraft
subsystems and the instrument payload are performing well. No Flight Sequences
are currently active.
The Flight Team commanded the spacecraft Script Buffer reinitialization and
uplinked Flight Sequence C11 today. Activation of C11 occurs tomorrow
(Tuesday) at 9:00 AM. Mars Observer Camera star imaging begins Wednesday at
9:00 AM and continues through July 1.
An all-day Preliminary Design Review of the Mapping Transition strategy takes
place tomorrow at JPL. GRS canister deploy and boom extension, the
Magnetometer boom extension, Solar Array deployment, and High Gain Antenna
deployment will be detailed. These deployments take place post-MOI (Mars
Orbit Insertion).
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The tuatara, a lizard-like
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | reptile from New Zealand,
|_____|/ |_|/ |_____|/ | has three eyes.
|
| 528.163 | Mars Observer Update -- 06/09/93 | CXDOCS::J_BUTLER | E pur, si muove... | Thu Jun 10 1993 15:42 | 54 |
| Article 3961 of sci.space.news:
Newsgroups: sci.space.news
Path: nntpd2.cxo.dec.com!pa.dec.com!decwrl!ames!dont-send-mail-to-path-lines
From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
Subject: Mars Observer Update - 06/09/93
Message-ID: <9JUN199322413624@kelvin.jpl.nasa.gov>
To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
News-Software: VAX/VMS VNEWS 1.41
Keywords: Mars Observer, JPL
Sender: digester@news.arc.nasa.gov
Nntp-Posting-Host: kelvin.jpl.nasa.gov
Organization: Jet Propulsion Laboratory
Date: Wed, 9 Jun 1993 22:41:00 GMT
Approved: sci-space-news@ames.arc.nasa.gov
Lines: 35
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
June 9, 1993
2:00 PM PDT
The spacecraft is stable in Array Normal Spin. Communication is via the High
Gain Antenna in Mission Mode; uplink at 125 bps, downlink is at the 4 kbps
data rate. One Way Light Time is 14 minutes and 38 seconds. The Payload Data
System, Gamma Ray Spectrometer, Magnetometer/Electron Reflectometer, and Mars
Observer Camera are powered on. Indications are that all spacecraft subsystems
and the instrument payload are performing well. Flight Sequence C11 is
currently active.
Activation of C11 occurred Tuesday at 9:00 AM as planned. Mars Observer Camera
star imaging was incorrectly reported to commence today at 9:00 AM in the
Monday, June 7 Status Update. The PI (Principal Investigator) and Payload
System Engineer advised that the MOC was powered on June 2 and began imaging
on June 3. Initial star observations over the weekend were used to fine-tune
procedures to be used during the remainder of the star imaging observational
period, which extends through 1 July. The first successfully targeted star
was alpha Serp Cap (Unukalhai), a magnitude 2.6 star.
An all-day Preliminary Design Review of the Mapping Transition strategy took
place Tuesday at JPL. Gamma Ray Spectrometer canister deploy and boom
extension, Magnetometer boom extension, Solar Array deployment, and High Gain
Antenna deployment were detailed. These deployments take place post-MOI
(Mars Orbit Insertion), beginning in November.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The tuatara, a lizard-like
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | reptile from New Zealand,
|_____|/ |_|/ |_____|/ | has three eyes.
|
| 528.164 | Mars Observer Update -- 06/15/93 | CXDOCS::J_BUTLER | E pur, si muove... | Thu Jun 17 1993 13:57 | 29 |
| Article 4008 of sci.space.news:
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
June 16, 1993
The spacecraft is stable in Array Normal Spin. Communication is via the High
Gain Antenna in Mission Mode; uplink at 125 bps, downlink at the 4 kbps data
rate. One Way Light Time is 15 minutes and 10 seconds. The Payload Data
System, Gamma Ray Spectrometer, Magnetometer/Electron Reflectometer, and Mars
Observer Camera are powered on. Indications are that all spacecraft subsystems
and the instrument payload are performing well. Flight Sequence C11 is
currently active.
The Flight Team is participating in a Mapping Operations Readiness Test, which
began today at 8:00 AM. The ORT, which runs through 6/30, will exercise Team
preparedness for normal Mapping activities.
Mars Observer Camera Star Imaging continues through July 1.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Don't outlive your money.
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 |
|_____|/ |_|/ |_____|/ |
|
| 528.165 | Mars Observer Update -- 06/18/93 | CXDOCS::J_BUTLER | E pur, si muove... | Mon Jun 21 1993 13:58 | 38 |
| Article 4033 of sci.space.news:
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
June 18, 1993
The spacecraft is stable in Array Normal Spin, with communication via
the High Gain Antenna in Mission Mode; uplink at 125 bps, downlink at the
4 kbps data rate. One Way Light Time is 15 minutes and 18 seconds. The Payload
Data System, Gamma Ray Spectrometer, Magnetometer/Electron Reflectometer,and
Mars Observer Camera are powered on. Indications are that all spacecraft
subsystems and the instrument payload are performing well. Flight Sequence C11
is currently active.
The Mars Balloon Relay (MBR) operational mode checkout took place on Tuesday,
June 25 beginning at 9:00 AM and running through 1:00 PM. All expected data
was received by the Mars Observer Camera Team and relayed to the French MBR
team for analysis.
>> Unless they haven't told us about their Time Machine, the above date must
>> be an error...jeb
Mars Observer Camera Star Imaging continues through July 1.
The Flight Team is participating in a Mapping Operations Readiness Test,
which began Wednesday at 8:00 AM. The ORT, which runs through 6/30, will
exercise Team preparedness for normal Mapping activities.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Don't outlive your money.
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 |
|_____|/ |_|/ |_____|/ |
|
| 528.166 | Mars Observer Update -- 06/25/93 | CXDOCS::J_BUTLER | E pur, si muove... | Mon Jun 28 1993 14:47 | 44 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
June 25, 1993
3:30 PM PDT
The spacecraft is stable in Array Normal Spin, with communication via the High
Gain Antenna in Mission Mode; uplink at 125 bps, downlink at the 4 kbps data
rate. One Way Light Time is 15 minutes and 49 seconds. The Payload Data
System, Gamma Ray Spectrometer, Magnetometer/Electron Reflectometer,and Mars
Observer Camera are powered on. Indications are that all spacecraft subsystems
and the instrument payload are performing well. Flight Sequence C11 is
currently active.
The C11 Sequence powered off the Mars Observer Camera Star today at 1:00 PM.
Interactive commands were used to power the MOC back on at the request of the
PI in order that MOC Imaging continues through 7/1.
The Flight Team is participating in a Mapping Operations Readiness Test, which
began Wednesday, 6/16 at 8:00 AM. The ORT, which runs through 6/30, will
exercise Team preparedness for normal Mapping activities.
The Mars Orbit Insertion strategy Final Design Review took place Tuesday, 6/22.
At that meeting, the MO Navigation Team Chief presented his view that a 4th TCM
(Trajectory Correction Maneuver) does not appear to be required at this time.
He advised that his recommendation will not be final until 7/20.
The Flight Team participated in the Radio Science Operations Readiness Test on
Thursday, 6/24. The ORT simulated signal loss and re-acquisition due to
occultation during mapping operations.
DTR (Digital Tape Recorder) repack activities took place today, 6/25.
The Verification Test Laboratory completed C12 Update testing. C12 contains
the MAG (Magnetometer) Calibration mini sequence. VTL is presently testing
FSW Build 8.1, which contains the STAREX covariance propagation "bug" fix.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Don't outlive your money.
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 |
|_____|/ |_|/ |_____|/ |
|
| 528.167 | Mars Observer Update -- 06/30/93 | CXDOCS::J_BUTLER | E pur, si muove... | Fri Jul 02 1993 14:28 | 41 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
June 30, 1993
4:00 PM PDT
The spacecraft is stable in Array Normal Spin, with communication via the High
Gain Antenna in Mission Mode; uplink at 125 bps, downlink at the 4 kbps data
rate. One Way Light Time is 16 minutes and 9 seconds. The Payload DataSystem,
Gamma Ray Spectrometer, Magnetometer/Electron Reflectometer,and Mars Observer
Camera are powered on. Indications are that all spacecraft subsystems and the
instrument payload are performing well. Flight Sequence C11 is currently active.
MOC (Mars Observer Camera) Imaging, planned to continue through 7/1, has been
extended 1 day. The PI (Principal Investigator) extension request will be
accommodated using non-stored commands.
The Flight Team Mapping Operations Readiness Test, which began Wednesday, 6/16
at 8:00 AM completed today. The ORT exercised Team preparedness for normal
Mapping activities.
Payload Data System Random Access Memory was reloaded on Wednesday, 6/30. The
uplink took approximately 6 hours and was successful.
ACTIVITIES NEXT WEEK
Flight Sequence C12 uplink will take place in a window opening at 7:00 AM on
Saturday, 7/3 and closing at 8:00 AM on Sunday, 7/4. C12 activation is at 9:00
AM on Sunday, 7/4.
Magnetometer Calibrations take place beginning at 2:50 AM Tuesday 7/6 and are
scheduled to end at 2:50 AM on Thursday, 7/8. Calibrations will be
accomplished by stored sequence (C12).
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Don't outlive your money.
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 |
|_____|/ |_|/ |_____|/ |
|
| 528.168 | Mars Observer Update -- 07/08/93 | CXDOCS::J_BUTLER | E pur, si muove... | Fri Jul 09 1993 19:19 | 33 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
July 8, 1993
3:30 PM PDT
The spacecraft is stable in Array Normal Spin, with communication via the High
Gain Antenna in Mission Mode; uplink at 125 bps, downlink at the 4 kbps data
rate, alternating to 8 kbps for DTR (Digital Tape Recorder) playbacks. One
Way Light Time is 16 minutes and 41 seconds. The Payload Data System, Gamma
Ray Spectrometer, Magnetometer/Electron Reflectometer,and Mars Observer Camera
are powered on. Indications are that all spacecraft subsystems and the
instrument payload are performing well. Flight Sequence C12A is currently
active.
The stored sequence completed Magnetometer Calibrations as scheduled on
Wednesday, 7/7. Calibration activities had begun at 1:02 AM on Monday. Those
activities required the Spacecraft to be commanded out of Inertial Reference
and slewed to 5 different MAG data gathering positions. Upon completion of
calibrations, the Spacecraft was returned to Earth pointing for restoration of
Inertial Reference and Array Normal Spin.
Magnetometer Data recorded on DTR 2 was replayed today beginning at 11:47 AM.
DTR2 will be replayed a second time tomorrow to insure complete data.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | There is no such thing as
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | a "temporary" tax increase.
|_____|/ |_|/ |_____|/ |
|
| 528.169 | Mars Observer Update -- 07/09/93 | CXDOCS::J_BUTLER | E pur, si muove... | Mon Jul 12 1993 21:15 | 32 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
July 9, 1993
The spacecraft is stable in Array Normal Spin, with communication via the High
Gain Antenna in Mission Mode; uplink at 125 bps, downlink at the 4 kbps data
rate, alternating to 8 kbps for DTR (Digital Tape Recorder) playbacks. One
Way Light Time is 16 minutes and 45 seconds. The Payload Data System, Gamma
Ray Spectrometer, and Magnetometer/Electron Reflectometer are powered on.
Indications are that all spacecraft subsystems and the instrument payload are
performing well. Flight Sequence C12A is currently active.
The first playbacks (1A-1C) of Magnetometer Data recorded on DTR 2 will
complete tonight (Friday 7/9). The second set of playbacks (2A-2D) will occur
Sunday and Monday (7/11-12). Full playback of all MAG Cal data recorded on
onboard DTRs would exceed the length of time available in one DSN (Deep Space
Network) tracking pass, necessitating incremental playback. The second
playback is to insure that all data is received.
The Mars Observer Camera PI (Principal Investigator) updated yesterday's
status report which stated that the MOC remained powered on. The MOC was
powered off on Friday, July 2.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | There is no such thing as
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | a "temporary" tax increase.
|_____|/ |_|/ |_____|/ |
|
| 528.170 | Mars Observer Update -- 07/14/93 | CXDOCS::J_BUTLER | E pur, si muove... | Fri Jul 16 1993 13:41 | 32 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
July 14, 1993
10:00 AM PDT
The spacecraft is stable in Array Normal Spin, with communication via the High
Gain Antenna in Mission Mode; uplink at 125 bps, downlink at the 4 kbps data
rate. One Way Light Time is 17 minutes and 4 seconds. The Payload Data System,
Gamma Ray Spectrometer, and Magnetometer/Electron Reflectometer are powered on.
Indications are that all spacecraft subsystems and the instrument payload are
performing well. Flight Sequence C12A is active .
Playbacks of Magnetometer Calibration data recorded on DTR 2 (Digital Tape
Recorder) were completed at 6:30 PM on Monday, 7/12.
The Flight Team is preparing for the uplink of Flight Software Version 8.1 to
occur in a window opening at 8:33 AM on Tuesday, 7/20, with task completion by
11:18 AM on Friday, 7/23. Attitude Control subsystem software tasks are being
updated to correct code which had contributed to the Spacecraft entering fault
protection Contingency Mode in January and April of this year. This will be the
last fix planned prior to commencement of Mars approach and capture activities.
Today the Spacecraft is 8,621,667 km (5,357,255 miles) from Mars, travelling at
a speed of 2.32 kps (5192 mph) with respect to Mars.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | There is no such thing as
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | a "temporary" tax increase.
|_____|/ |_|/ |_____|/ |
|
| 528.171 | Mars Observer Update -- 07/20/93 (MOI - 35) | CXDOCS::J_BUTLER | E pur, si muove... | Fri Jul 23 1993 01:31 | 28 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
July 20, 1993
MOI -35 Days
The spacecraft is stable in Array Normal Spin, with communication via the High
Gain Antenna; uplink at 125 bps, downlink at the 2 kbps Engineering data rate.
One Way Light Time is 17 minutes and 25 seconds. The Payload Data System,
Gamma Ray Spectrometer, and Magnetometer/Electron Reflectometer are powered on.
Indications are that all spacecraft subsystems and the instrument payload are
performing well. Flight Sequence C12A is active .
Uplink of Flight Software Version 8.1 is underway. Activities began at 8:33 AM
this morning, with planned task completion by 11:18 AM on Friday, 7/23. On-
board Attitude Control Subsystem software tasks are being modified in a series
of uplinks over the next 3 days. This will be the last planned fix prior to
commencement of Mars approach and capture activities. The first of these is
Mars Observer Camera imaging of Mars starting with a photo pass beginning
Monday, July 26, at 9:18 AM and completing the following morning at 12:48 AM.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Common sense is not very
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | common.
|_____|/ |_|/ |_____|/ |
|
| 528.172 | Mars Observer Update -- MOI-27 -- 07/28/93 | CXDOCS::J_BUTLER | E pur, si muove... | Fri Jul 30 1993 14:15 | 34 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
July 28, 1993
MOI -27 Days
The spacecraft is stable in Array Normal Spin, with communication via the High
Gain Antenna; uplink at 125 bps, downlink at the 4 kbps Science and
Engineering data rate, alternating to 8 kbps for Digital Tape Recorder
Playbacks. One Way Light Time is 17 minutes and 51 seconds. The Payload Data
System, Gamma Ray Spectrometer, and Magnetometer/Electron Reflectometer are
powered on. Indications are that all spacecraft subsystems and the instrument
payload are performing well. Flight Sequence C12A is active .
The MOC (Mars Observer Camera) mini-sequence containing the MOC data taking
opportunity and playback of recorded MOC data which began at 8:45 AM on
Monday, 7/26, ends at 7:48 AM tomorrow with completion of the second Digital
Tape Recorder playback. Indications are that data taking activities went well.
The window for uplink of Flight Sequence C12 B opens at 3:49 AM on Saturday and
closes at 7:31 AM on Sunday. C12 B activation occurs at 8:25 AM Sunday, 8/1.
C12 B includes Thermal Emissions Spectrometer approach calibrations. The C13 A
uplink window opens at 9:24 PM on Sunday, 8/1 and closes at 7:24 AM on Tuesday
8/3, with C13 A sequence activation at 8:00 AM, also on 8/3.
MOI = Mars Orbit Insertion
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Common sense is not very
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | common.
|_____|/ |_|/ |_____|/ |
|
| 528.173 | Mars Observer Update -- 07/30/93 (MOI-25 days) | CXDOCS::J_BUTLER | E pur, si muove... | Mon Aug 02 1993 15:17 | 42 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
July 30, 1993
MOI -25 Days
The spacecraft is stable in Array Normal Spin, with X-Band communication via
the High Gain Antenna; uplink at 125 bps, downlink at the 4 kbps Science and
Engineering data rate. One Way Light Time is 17 minutes and 57 seconds. The
Payload Data System, Gamma Ray Spectrometer, and Magnetometer/Electron
Reflectometer are powered on. Indications are that all spacecraft subsystems
and the instrument payload are performing well. Flight Sequence C12 A
continues to clock out through the start of C12 B at 8:30 AM on Sunday,
August 1.
The Flight Team supported Mars Observer Camera data taking activities 7/26
through 7/29. Indications are that data acquisition was successful.
Preparations have been completed for loading Flight Sequence C12 B in an uplink
window which opens at 3:49 AM on Saturday and closes at 7:31 AM on Sunday. C12
B contains commands to perform Thermal Emissions Spectrometer calibrations.
Those calibrations will be completed Sunday, August 1. Members of the Flight
Team will be at their stations during TES Cal execution. C12 B total duration
is slightly under 48 hours.
Flight Sequence C13 will be uplinked on Thursday, 8/5. TCM-4 (Trajectory
Correction Maneuver #4) commands have been removed from C13, since the
accuracy of previous maneuvers has made the planned 4th TCM unnecessary.
C13 will perform a second set of TES Calibrations.
Today the Spacecraft is 5,346,559 km (3,322,198 miles) from Mars, travelling at
a speed of 2.41 kps (5393 mph) with respect to Mars.
MOI = Mars Orbit Insertion
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Common sense is not very
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | common.
|_____|/ |_|/ |_____|/ |
|
| 528.174 | Mars Observer Update -- Spacecraft Emergency | CXDOCS::J_BUTLER | E pur, si muove... | Mon Aug 02 1993 19:05 | 21 |
|
MARS OBSERVER STATUS REPORT
August 2, 1993
On August 2, 1993 at 0014Z, TPA-3 (Telemetry Processing Assembly) at
DSS-15 (Goldstone 34 meter antenna) dropped lock on the 8000 bps telemetry
data from the Mars Observer spacecraft. The SNR (Signal-to-Noise Ratio)
and AGC (Automatic Gain Control) had been declining since 0001Z. TPA-3 also
failed to lock on the 4000 bps telemetry when the telemetry bit rate changed
at 0034Z. At 0046Z, the receiver dropped lock. The project declared a
spacecraft emergency at 0127Z. The spacecraft was sun coning and alternating
between receivers 1 & 2 every 100 minutes. At 0132Z and 0148Z, the receiver
was in-lock with 10 bps coded telemetry.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | When given a choice between
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | two exciting things, choose
|_____|/ |_|/ |_____|/ | the one you haven't tried.
|
| 528.175 | Mars Observer Update #2 -- 08/02/93 | CXDOCS::J_BUTLER | E pur, si muove... | Tue Aug 03 1993 03:12 | 22 |
|
MARS OBSERVER STATUS REPORT
August 2, 1993
MOI -22 days
The spacecraft entered contigency mode at approximately 5:10 PM PDT
yesterday, Sunday, August 1. Planned TES (Thermal Emmission Spectrometer)
calibrations had completed and the spacecraft was verified in ANS (Array
Normal Spin), when a larger than expected attitude correction precipitated
events leading the loss of inertial reference. The events which led to the
inertial reference loss are understood, and the flight team is currently in
the process of returning the spacecraft to inertial reference expected by
late today. Complete recovery to ANS is expected to be completed by tomorrow.
MOI = Mars Orbit Insertion.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | When given a choice between
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | two exciting things, choose
|_____|/ |_|/ |_____|/ | the one you haven't tried.
|
| 528.176 | Mars Observer Update -- 08/03/93 (MOI-21 days) | CXDOCS::J_BUTLER | E pur, si muove... | Wed Aug 04 1993 13:28 | 60 |
|
Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
August 3, 1993
The Mars Observer spacecraft has taken the first photograph
of Mars since the Viking missions of the mid-1970s as it
approached the planet at a distance of about 5.8 million
kilometers (3.6 million miles) on Monday, July 26. The
photograph was taken using the spacecraft's high resolution,
narrow-angle camera, which provides resolution of about 21.5
kilometers (13.4 miles) per picture element. The photograph is
currently being processed and will be ready for release within
about a week.
The flight team reports that all spacecraft subsystems and
instrument payload are performing well.
The spacecraft experienced a brief episode in which it
switched to an automatic contingency mode, a benign, self-
protective default mode. The switch occurred at approximately 5
p.m. Pacific Daylight Time on Sunday, Aug. 1, after the
spacecraft had successfully completed a sequence of thermal
emission spectrometer calibrations. While reorienting its
position relative to stars and the sun, the spacecraft performed
a larger than expected attitude correction, precipitating the
events which led to loss of inertial reference. Full recovery to
normal cruise mode, called "array normal spin," was completed by
8 p.m. PDT on Monday, Aug. 2.
Contingency mode is one of three built-in safing modes
designed to restore communications with the spacecraft when
unknown events occur in space. In this instance, the onboard
flight software was unable to identify the spacecraft's position
in space in relation to certain stars and the sun. When that
happens, the spacecraft automatically points at the sun, throwing
the high-gain antenna off target with Earth. Communications are
switched to the low-gain antenna, which operates on lower data
rates. Unnecessary power loads, such as the science instruments
and tape recorders, are temporarily turned off.
Today Mars Observer is about 4.5 million kilometers (2.8
million miles) from Mars, traveling at a speed of about 8,640
kilometers per hour (5,400 miles per hour) relative to Mars. The
spacecraft will be captured in orbit around Mars on Aug. 24, and
begin its global mapping mission in mid-December.
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | When given a choice between
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | two exciting things, choose
|_____|/ |_|/ |_____|/ | the one you haven't tried.
|
| 528.177 | First Mars image from MO available | VERGA::KLAES | Quo vadimus? | Mon Aug 09 1993 21:13 | 90 |
| From: US1RMC::"baalke@kelvin.Jpl.Nasa.Gov" "Ron Baalke" 6-AUG-1993
To: sci-space-news@uunet.uu.net
CC:
Subj: Mars Observer GIF Image
==========================
MARS OBSERVER GIF IMAGE
August 6, 1993
==========================
The first image taken by the Mars Observer spacecraft of Mars is
now available at the JPL Public Information access site in GIF format.
This image is courtesy of the Public Information Office at JPL and was
scanned in from a photograph and is not the raw digital data. Also,
note that the image is in GIF89a format, so make sure your display
software supports this particular format (as opposed to the older
GIF87a format). The caption file accompanying the image is appended
at the end of this message, as well as being embedded in the image
itself. The image is available by dialup modem at +1 (818) 354-1333,
up to 9600 bps, parameters N-8-1, or by using anonymous ftp to:
ftp: jplinfo.jpl.nasa.gov (137.78.104.2)
user: anonymous
cd: news (will be moved to the images directory in 30 days)
files: marsapp.gif
*****IMPORTANT*****
Note that the JPL ftp site now has a new name and IP number:
jplinfo.jpl.nasa.gov (137.78.104.2)
*****IMPORTANT*****
Photographic prints of these images can be ordered from Newell
Color Lab listed below. Refer to the P number associated with the
images when ordering.
Newell Color Lab
221 N. Westmoreland Avenue
Los Angeles CA 90064
Telephone: (213) 380-2980
FAX: (213) 739-6984
------------------------------------------------------------------------------
marsapp.gif
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
PHOTO CAPTION August 6, 1993
P-42748
Mars Observer #1
Photograph of the planet Mars taken at 8:52 p.m. Pacific Daylight
Time on July 26 by the high resolution, narrow-angle telescope of
the Mars Observer Camera. At that time, the Mars Observer
spacecraft was 5.8 million kilometers (3.6 million miles) and 28
days from its encounter with Mars. The resolution in this image
is approximately 21.5 km (13.4 mi) per picture element and Mars,
roughly 6,800 km (4,200 miles) in diameter, is about 315 picture
elements across. North is to the top of the image; the south
pole is near the bottom but in shadow. The sunrise line
(terminator) stretches across the morning hemisphere from lower
right to upper left. At this distance from Mars, only bright and
dark markings resulting from variations in the amount and
thickness of dust and sand are visible. Toward the bottom of the
picture is a bright, roughly circular area called Hellas, an
impact basin 2,000 km (1,250 mi) across. The dark area in the
center of the frame is Syrtis Major, a region of volcanic plains
and dark sand dunes. At the top of the photograph is Nilosyrtis,
an area of buttes, mesas and box canyons reminiscent of the
deserts of the southwest United States. Launched on Sept. 25,
1992, Mars Observer will enter Mars orbit on Tuesday, Aug. 24, at
about 1:30 p.m. PDT. In-orbit engineering checkout of the camera
is scheduled to begin Sept. 16. The camera and six other
investigations begin mapping operations from a circular orbit
just 400 km (248 mi) above the surface on Nov. 22. The Mars
Observer Camera was developed by and is operated under contract
to Jet Propulsion Laboratory by an industry/university team led
by Malin Space Science Systems, San Diego, Calif.
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | When given a choice between
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | two exciting things, choose
|_____|/ |_|/ |_____|/ | the one you haven't tried.
|
| 528.178 | Available from the archive... | PRAGMA::GRIFFIN | Dave Griffin | Mon Aug 09 1993 22:09 | 5 |
| pragma::public:[nasa]mo_marsapp.gif
530x480 monochrome
- dave
|
| 528.179 | Viewer? | SKYLAB::FISHER | Carp Diem : Fish the Day | Tue Aug 10 1993 16:41 | 6 |
| Apparently this is a newer gif format than my viewer will read. Can anyone
recommend a gif viewer that will grok this format (for X11/VMS)?
Thanks,
Burns
|
| 528.180 | | PRAGMA::GRIFFIN | Dave Griffin | Tue Aug 10 1993 17:39 | 3 |
| I used XV with no problems.
- dave
|
| 528.181 | Benefits of the first Mars images | VERGA::KLAES | Quo vadimus? | Wed Aug 11 1993 16:10 | 22 |
| Article: 40721
Newsgroups: sci.space,sci.astro,alt.sci.planetary
From: collins@well.sf.ca.us (Steve Collins)
Subject: Re: Mars Observer's First Photo (MEDIA WANTS DIGITAL IMAGES!)
Sender: news@well.sf.ca.us
Organization: The Whole Earth 'Lectronic Link, Sausalito, CA
Date: Tue, 10 Aug 1993 06:27:14 GMT
The Mars image has merit from several standpoints. It provides and
important data point for calibration of the camera, it lets us start
to work out some of the operational problems associated with targeting
and acquiring such images, it allows an assesment of the clarity of
the martian atmosphere (much clearer than for viking) and it serves a
public information purpose. In addition, at least some direct science
could be done from the image, which has better resolution than Hubble
pictures. A dust storm was observed in an area where Viking had seen
similar storms in the past. Hang in there while we get ourselves in
orbit. Mars Observer will return more data than all the earlier Mars
missions put together...
Steve Collins MO Spacecraft Team (AACS)
|
| 528.182 | Mars Observer Update -- 08/12/93 (MOI - 12 days) | TINCUP::J_BUTLER | E pur, si muove... | Thu Aug 12 1993 21:25 | 34 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 12, 1993
MOI -12 Days
The spacecraft is stable in Array Normal Spin, with X-Band communication via
the High Gain Antenna; uplink at 125 bps, downlink at the 2 kbps Engineering
data rate. One Way Light Time is 18 minutes and 34 seconds. The Payload Data
System, Gamma Ray Spectrometer, and Magnetometer/Electron Reflectometer are
powered on. Indications are that all spacecraft subsystems and the instrument
payload are performing well. Flight Sequence C13 B is active through August 17.
Flight Sequence T1 was uplinked on Friday, August 6. T1 has 2 components: T1 A
which pressurizes propellant tanks prior to the insertion burn; and T1 B which
contains maneuver execution parameters. The T1 B component currently onboard is
designated T1 B-backup. It insures that a capture maneuver will be performed,
even if communication with the ground were to be lost due to unforeseen events
on the ground. Updated T1 B maneuver parameters will be uplinked as the T1 B
load to be used for the maneuver on 8/20, 4 days prior to MOI. A command
contained in the 8/20 T1 B load terminates the T1 B-backup script.
Today the Spacecraft is 2,611,543 km (1,622,737 miles) from Mars, travelling at
a speed of 2.46 kps (5492 mph) with respect to Mars.
MOI = Mars Orbit Insertion
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | When given a choice between
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | two exciting things, choose
|_____|/ |_|/ |_____|/ | the one you haven't tried.
|
| 528.183 | Mars Observer Update -- 08/13/93 (MOI - 11 days) | TINCUP::J_BUTLER | E pur, si muove... | Mon Aug 16 1993 14:00 | 27 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 13, 1993
MOI -11 Days
The spacecraft is stable in Array Normal Spin, with X-Band communication via
the High Gain Antenna; uplink at 125 bps, downlink at the 2 kbps Engineering
data rate. One Way Light Time is 18 minutes and 37 seconds. The Payload Data
System, Gamma Ray Spectrometer, and Magnetometer/Electron Reflectometer are
powered on. Indications are that all spacecraft subsystems and the instrument
payload are performing well. Flight Sequence C13 B is active through August 17.
A portion of Gamma Ray Spectrometer Random Access Memory was reloaded
Wednesday, 8/11 to allow the team to monitor instrument temperatures through
MOI (Mars Orbit Insertion)
Today the Spacecraft is 2,399,305 km (1,490,859 miles) from Mars, travelling at
a speed of 2.46 kps (5498 mph) with respect to Mars.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | When given a choice between
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | two exciting things, choose
|_____|/ |_|/ |_____|/ | the one you haven't tried.
|
| 528.184 | Mars Observer Update -- 08/16/93 (MOI - 8 days) | TINCUP::J_BUTLER | E pur, si muove... | Tue Aug 17 1993 17:27 | 36 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 16, 1993
MOI -8 Days
The spacecraft is stable in Array Normal Spin, with X-Band communication via
the High Gain Antenna; uplink at 125 bps, downlink at the 2 kbps Engineering
data rate. One Way Light Time is 18 minutes and 44 seconds. The Payload Data
System, Gamma Ray Spectrometer, and Magnetometer/Electron Reflectometer are
powered on. Indications are that all spacecraft subsystems and the instrument
payload are performing well. Flight Sequence C13-B is active.
Flight Sequence T1-A becomes active tomorrow, Tuesday, 8/17. T1-A pressurizes
bi-propellant tanks for the Mars Orbit Insertion maneuver. Pressurization takes
place on Saturday, 8/21.
The window for uplink of the final T1-B opens at 11:00 AM on Friday, 8/20 and
extends through 2:00 AM on Saturday, 8/21. T1-B, which contains the maneuver
execution parameters, becomes active at 8:19 AM on Monday, 8/23. The execution
"burn" occurs at 1:45 PM on Tuesday, 8/24. First post-MOI burn telemetry is
expected shortly before 3:00 PM that day.
Suzanne Dodd, Mission Planning Team Chief, will present a Mars Orbit Insertion
Overview as part of the SSORCE Lecture Series tomorrow, 8/17, from Noon to 1:00
PM, in Von Karman Auditorium.
MOI = Mars Orbit Insertion
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.185 | | SKYLAB::FISHER | Carp Diem : Fish the Day | Tue Aug 17 1993 19:33 | 13 |
| I was listening to Suzanne Dodd's lecture...some interesting facts:
MOI burn, 1:28 PDT (spacecraft time, i.e. not counting radio delay). First
data after MOI should be received at 2:45 PDT Aug 24.
Initial orbit about Mars: 75 hours.
An interm orbit will be about 23 hrs, during which they may come within 250Km
of Phobos, and during that time the MO instruments may be pointing at Phobos.
It all depends on how much error is in the MOI burn and all the other burns that
come after that.
Burns
|
| 528.186 | | AUSSIE::GARSON | Carpe dime | Wed Aug 18 1993 02:59 | 5 |
| re .-1
Wasn't one of the Soviet Mars probes in the vicinity of Phobos when
contact was lost with it? Any chance of its being visible? Where is it
now?
|
| 528.187 | Mars Observer Update -- 08/17/93 (MOI - 7 days) | TINCUP::J_BUTLER | E pur, si muove... | Wed Aug 18 1993 12:23 | 35 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 17, 1993
MOI -7 Days
The spacecraft is stable in Array Normal Spin, with X-Band communication via
the High Gain Antenna; uplink at 125 bps, downlink at the 2 kbps Engineering
data rate. One Way Light Time is 18 minutes and 47 seconds. The Payload Data
System, Gamma Ray Spectrometer, and Magnetometer/Electron Reflectometer are
powered on. Indications are that all spacecraft subsystems and the instrument
payload are performing well. Flight Sequence T1-A is active.
Flight Sequence T1-A became active today at 9:00 AM. T1-A pressurizes bi-
propellant tanks for the Mars Orbit Insertion maneuver. Pressurization takes
place on Saturday and Sunday, 8/21-22.
Preparations continue for Mars Orbit Insertion on Tuesday, 8/24. The final T1-B
load containing the maneuver execution parameters is scheduled to be uplinked
on Friday, 8/20. T1-B goes active at 8:19 AM Monday, 8/23.
Today the Spacecraft is 1,535,021 km (953,818 miles) from Mars, travelling at a
speed of 2.47 kps (5,520 mph) with respect to Mars. Today's spacecraft velocity
with respect to Mars will more than double by 8/24 as the planet's
gravitational attraction increases.
MOI = Mars Orbit Insertion
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.188 | Mars Orbit Insertion Approaches | TINCUP::J_BUTLER | E pur, si muove... | Wed Aug 18 1993 12:26 | 81 |
|
From the "JPL Universe"
August 13, 1993
Mars Orbit Insertion Approaches
By Diane Ainsworth
The first spacecraft photograph of Mars in more than a
decade was unveiled last week at JPL, culminating a weeklong
celebration of NASA's return to the Red Planet.
The photograph, taken by the Mars Observer spacecraft's
high-resolution, narrow-angle telescope at a distance of 5.8
million kilometers (3.6 million miles), was presented by the
camera's principal investigator, Michael Malin, at the final
noontime briefing on Aug. 6 to an overflow crowd in Building 180.
"The impressive thing is not what we took but from how far
away we took it," said Malin, who heads up Malin Space Science
Systems Inc. in San Diego, in discussing prominent features in
the photograph.
"We took two pictures in the imaging sequence, with the
second one taken about an hour later," he said. "We can see
Syrtis Major, a large volcanic plain covered with sand dunes, in
the center of the frame; Utopia, where the Viking 2 landed, and
Nilosyrtis, an area of buttes and mesas, at the top of the
planet."
Hellas, an impact basin 2,000 kilometers (1,250 miles)
across and known to give rise to dust storms, appeared brighter
in the one-hour interval between snapshots, Malin noted.
The camera, which will be able to resolve objects as small
as a few yards across when it reaches orbit, also captured Mars
in a quiescent state, when the atmosphere was still and clear.
"The atmosphere is crystal clear, much clearer than the
Viking data," Malin said. "We anticipate crystal-clear pictures
on arrival."
The spacecraft is on course for capture in orbit around Mars
at approximately 1:40 p.m. PDT Aug. 24. The orbit insertion
maneuver is the largest and most critical maneuver to be
performed. The burn will last 29 minutes and lower the spacecraft
to about 1,488 kilometers (923 miles) above the Martian surface.
The navigation team expects to be able to announce the results of
that maneuver by about 3 p.m. that day.
After the spacecraft is in orbit, it will spend about three
months circularizing its orbit into the final, 118-minute, nearly
polar mapping orbit. From an altitude of 378 kilometers (234
miles) above the surface, Mars Observer will begin a two-year
global mapping mission to study the Martian atmosphere, surface
and interior.
The first color photographs of the Martian surface, taken by
the spacecraft's second camera telescope, may be released by
mid-September, Malin said.
The camera team also has "tens of thousands" of camera
targets on their wish list, features they want to photograph at
high resolution, once full science operations are under way.
"My personal wish is to get some pictures of the Viking
landing sites," Malin said, "because they will give us some
context in which to determine what has happened (in the decade
since Viking stopped transmitting pictures)."
NASA has no plans to treat the Cydonia region, the so-called
"face on Mars," any differently than other regions of the planet,
Malin added. Because Mars Observer is a two-year mapping mission,
at least some high-resolution images of the region should be
obtained.
Malin said the interest overall is in studying the
geological forces that have shaped many unique features on the
planet. For instance, Mars sports the largest volcano in the
solar system, Olympus Mons, which rises 27 kilometers (17 miles)
high and is 600 kilometers (372 miles) wide at the base. Valles
Marineris, an immense canyon in the Northern Hemisphere, would
stretch clear across the continental United States.
"We can't say how many photographs we will take because we
don't know yet," Malin said. In terms of billions of bits of data
returned, though, the mission will yield roughly the equivalent
of all other planetary missions.
###
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.189 | | TINCUP::J_BUTLER | E pur, si muove... | Wed Aug 18 1993 12:33 | 18 |
| Re: .186
>Wasn't one of the Soviet Mars probes in the vicinity of Phobos when
>contact was lost with it? Any chance of its being visible? Where is
>it now?
I believe the Soviet Phobos craft was near the moon Phobos when it
failed. I don't believe it is likely that anything would be left.
The Soviet Phobos was in an eliptical orbit at the time,
as I recall, so it probably has impacted on Mars by now.
Just my guess...
Regards,
John B.
|
| 528.190 | RE 528.189 | VERGA::KLAES | Quo vadimus? | Wed Aug 18 1993 13:50 | 11 |
| PHOBOS 2 was just one week away from landing several smaller
probes on Mars' largest moon in 1989 when an antenna pointing error
cost the entire mission. I have read that the probe would eventually
hit Phobos, but I have no idea when, where, or if it ever did. I also
have the feeling that PHOBOS 2 may be too small to see by MO, but it
would be worth looking for.
See SPACE Topic 439 for details on the PHOBOS mission to Mars.
Larry
|
| 528.191 | | PRAGMA::GRIFFIN | Dave Griffin | Wed Aug 18 1993 17:29 | 15 |
| The questions of collision with Phobos (the moon/asteroidlet) and PHOBOS (the
probe) were raised at the press conference. The chances of hitting either are
1:10,000 -- although the project manager had issued a dicate to the navigation
team that MO shall NOT hit Phobos - they are doing their best not to.
Even if they knew where PHOBOS 2 was (and there was some vague discussion
about that as well -- the data may be 5 years old and therefore pretty useless
for precision orbit calculations), MO will still be in its cruise spin, so
it is not as if they could focus on a particular spot and do a deep exposure
(which would be necessary to see something that small). Images of Phobos
will be "chance as chance can" as the camera sweeps across the orbit of Phobos.
Insertion into orbit is the prime objective - the Phobos pics are a bonus.
- dave
|
| 528.192 | Next Reply: MOI Press Kit | TINCUP::J_BUTLER | E pur, si muove... | Thu Aug 19 1993 14:40 | 8 |
| The next reply is the Mars Observer MOI press kit.
It is over 1000 lines long, so if you are using DECwindows Notes, you
may want to extract it.
Regards,
John B.
|
| 528.193 | MOI Press Kit | TINCUP::J_BUTLER | E pur, si muove... | Thu Aug 19 1993 14:41 | 1019 |
|
MARS OBSERVER
Mars Orbit Insertion
August 24, 1993
PRESS KIT
GENERAL RELEASE
The National Aeronautics and Space Administration's Mars
Observer spacecraft arrives at Mars at approximately 1:40 p.m.
Pacific Daylight Time on Aug. 24, 1993, after an 11-month, 450-
million-mile (720-million-kilometer) journey through the inner
solar system.
The Mars Observer mission is a global scientific mapping
mission. The spacecraft carries a complement of new instruments
to the Red Planet, and it will provide a long-lived orbital
platform from which these instruments will examine the entire
Martian surface, atmosphere and interior. Measurements will be
collected from a low-altitude, nearly polar orbit, 234 miles (378
kilometers) above the Martian surface, over the course of one
complete Martian year -- the equivalent of about two Earth years
or 687 Earth days.
"Throughout its primary, two-year mission, Mars Observer
will gather information on the geology, geophysics and climate of
Mars," said JPL Project Manager Glenn E. Cunningham.
"The mission will provide a global portrait of Mars as it
exists today," he said. "This view will help planetary
scientists to better understand the history of Mars' evolution,
and will provide clues about the planet's interior and surface
evolution. With this information, we will have a better
understanding of the history of all of the inner planets of the
solar system, including our own Earth."
Mars Observer continues NASA's long exploration of the Red
Planet, which began nearly 30 years ago with the Mariner IV
spacecraft that produced the first pictures of the planet's
cratered surface. The last U.S. spacecraft to visit Mars were
the twin Viking orbiters and landers, which arrived at Mars in
1976. The landers touched down on the Martian surface and
analyzed samples of the Martian surface to look for signs of life
in the planet's distant past.
Mars Observer was lofted into Earth orbit at 1:05 p.m.
Eastern Daylight Time (10:05 a.m. Pacific Daylight Time) on Sept.
25, 1992, aboard a Titan III launch vehicle with a Transfer Orbit
Stage (TOS) booster, which later injected the spacecraft on its
path to Mars.
Once on course for the cruise to Mars, the spacecraft
deployed four of its six solar panels to begin generating solar
power, and partially extended its high-gain antenna and two booms
on which science instruments are mounted. The low-gain antenna
was used for initial spacecraft communications, until the
spacecraft was far enough away from Earth in early January 1993
to require use of the dish-shaped, high-gain antenna.
Mars Observer's seven science instruments were calibrated
during the cruise to Mars. In addition, the radio science team
participated in a three-week attempt to detect gravity waves
using the spacecraft's own telecommunication system with those of
two other interplanetary spacecraft, Galileo and Ulysses. All
spacecraft subsystems and the instrument payload have performed
well as Mars Observer headed for its destination, said Dr. Sam
Dallas, Mars Observer mission manager at JPL.
"Since launch, we have sent more than 500 command files to
the spacecraft, containing instructions to be carried out by the
spacecraft and its payload," Dallas said. "The spacecraft has
executed these instructions flawlessly, except on two or three
occasions when minor errors occurred. The spacecraft and payload
hardware have had no failures thus far."
When the spacecraft reaches Mars on Aug. 24, onboard rocket
engines will fire to slow the spacecraft's speed by more than
1,500 miles per hour (2,400 kilometers per hour) with respect to
Mars and allow the craft to be captured by Mars' gravity. Mars
Observer will then follow a "power in" orbit insertion strategy,
using seven braking and orbit trim maneuvers to insert the
spacecraft into the planned mapping orbit in less than three
months (see Orbit Insertion Maneuver schedule, page 10).
The first insertion maneuver, called Mars Orbit Insertion
(MOI), is the largest and most critical maneuver to be performed
by the spacecraft. When the spacecraft is about 1,072 miles
(1,730 kilometers) above the surface of the planet, it will fire
two of its four large, 490-Newton thruster rockets to slow its
speed enough to enter orbit around Mars, said Suzanne Dodd, Mars
Observer mission planning team chief. The burn will last 29
minutes and place the spacecraft at about 308 miles (498
kilometers) above the Martian surface at periapsis, the closest
approach to the planet.
"Mars Observer will be flying over the north pole and
Olympus Mons, a huge Martian volcano, when it enters orbit around
Mars," Dodd said. "The spacecraft will first spend 10-1/2 days in
this highly elliptical orbit around the planet, completing just
one orbit around Mars every three days."
Instrument calibrations and some science measurements will
take place during the elliptical orbit phase, according to Dr.
Arden Albee, Mars Observer project scientist.
"The spacecraft will be crossing in and out of the planet's
magnetic field during this initial, three-day orbit around Mars,"
Albee said. "Mars Observer will be able to make unique
measurements of the interactions of magnetic field lines with the
solar wind that will not be observable from the lower altitude
mapping orbit.
"This will also be a critical period for Magnetometer and
Gamma Ray Spectrometer calibrations," he said. "Noise from the
spacecraft will have to be subtracted out to obtain the magnetic
and gamma ray signatures of Mars, and that can only be done as
the spacecraft moves closer and then farther away from this
planetary boundary."
Eleven days after MOI, the first of two trim maneuvers,
called Elliptical Change Maneuvers (ECM-1 and ECM-2), will be
performed to slow the spacecraft into a one-day "drift orbit"
around Mars. The spacecraft will spend 32 days in this 23-hour
orbit, waiting for Mars to move around the sun so that it can
drift into the correct lighting position for the mapping orbit (2
p.m. local Mars time) without using up valuable fuel reserves. A
third ECM will adjust the orbit parameters before the spacecraft
begins to descend into the low-altitude mapping orbit.
The entire spacecraft payload will be turned on and
calibrated during this one-day drift orbit. From Sept. 16 to Oct.
16, all instruments except the Mars Observer Laser Altimeter
(MOLA) will be operating for varying amounts of time. From this
orbit, Mars Observer may also be able to make observations of
Phobos, the larger of Mars' two moons. The science payload may
help determine the surface mineral content of this potential
asteroid as the spacecraft passes possibly as close as 248 miles
(400 kilometers) from Phobos during each orbit of Mars.
An instrument called the Pressure Modulator Infrared
Radiometer (PMIRR) will make radiometric scans of Phobos in
visible and infrared wavelengths, while the Thermal Emission
Spectrometer (TES) measures the temperature of this airless body.
The Magnetometer and Electron Reflectometer will measure particle
disturbances in the Martian atmosphere caused by Phobos' orbit
around Mars. Imaging by the Mars Observer Camera (MOC) may be
attempted, depending on how closely the spacecraft passes by the
moon.
As the spacecraft continues to circularize its orbit, NASA's
Deep Space Network 112-foot (34-meter) antennas will be used to
begin a radio science experiment, measuring small shifts in the
spacecraft's velocity that will tell scientists more about the
planet's gravity field.
Two Transfer-to-Low-Orbit (TLO) maneuvers will then bring
the spacecraft into the near-circular mapping orbit. The first,
TLO-1, will be performed on Oct. 17 to bring the spacecraft into
a 4.2-hour orbit. After that maneuver has been performed, the
spacecraft will spend a week characterizing the complete gravity
field of Mars in detail. A gravity map of the entire planet will
be created from variations in the radio signals from the
spacecraft due to variations in mass distribution around the
planet.
TLO-2 will be performed on Oct. 28 to adjust the orbit again
and bring the spacecraft into the desired 118-minute mapping
orbit. A subsequent trim maneuver (Orbit Change Maneuver or OCM)
will occur on Nov. 8 to correct any small errors in the orbit.
On that day, 76 days after Mars orbit insertion, the
spacecraft will reach its near-circular, near-polar mapping
orbit, inclined 93 degrees to the planet's equator.
Starting on Nov. 12, the spacecraft will fully deploy the
two remaining solar panels, the high-gain antenna and the two
science booms in preparation for the start of mapping. Boom
deployments will occur a month ahead of solar conjunction -- the
period when the spacecraft moves behind the sun as seen from
Earth -- to insure that any problems associated with all these
deployments can be solved before spacecraft-to-Earth
communications are diminished.
All of the spacecraft's instruments will be turned on Nov.
23 for a final in-orbit checkout. Mars Observer will undergo in-
orbit checkout through Dec. 16, operating its payload and testing
its mapping command sequences. Data from this final checkout
phase will allow the spacecraft to obtain one complete global map
of the surface -- a process which takes 26 days -- before the
solar conjunction in December blocks spacecraft communications.
"There is a very distinct advantage to getting this first
mapping cycle right up front," Albee said. "The Martian dust
storms occur roughly between February and August, so the
atmosphere should be very clear in November when we begin
mapping. An early start will also provide us with an excellent
opportunity to obtain data before and after a Martian dust storm,
since the dust storm period will resume in February 1994."
In addition to allowing Mars Observer to observe the birth
and development of a global Martian dust storm -- if one should
occur this Martian year -- the first 26-day mapping period will
allow the scientific teams to become more familiar with operating
their instruments from more than 200 million miles away.
In its mapping orbit, the spacecraft will circle the planet
at a speed of about 7,500 miles per hour (12,000 kilometers per
hour) with respect to Mars and in an orbit that will take it
close to both poles. On the day side of the planet, Mars
Observer will be traveling from north to south. On each orbit,
it will cross the equator at about 2 p.m. local Mars time. It
will always see the surface of Mars on the daylit side as it
appears at mid-afternoon. This "sun-synchronous" orbit puts the
sun at a standard angle above the horizon in each image, with the
mid-afternoon lighting angle casting shadows that will make
surface features stand out.
Solar conjunction begins on Dec. 20 and lasts through Jan.
3, 1994. During this time, Mars' orbit around the sun will take
the spacecraft behind the sun as seen from Earth. This planetary
alignment will create a "command moratorium" for mission
operations.
"Ground-controllers will be out of contact with the
spacecraft and will not transmit radio signals because of the
noise caused by the sun's interference," Dallas said. "The
spacecraft, however, will be fully deployed and in the mapping
configuration, thereby minimizing the risk of problems occurring
during this break in communications."
Experiment teams, who will control the spaceborne
instruments from their home institutions, will also be out of
contact with the spacecraft. But as two-way communication is
restored in early January 1994, they will begin to command their
experiments and access data daily using a computer network
linking them to the Mars Observer operations center at JPL.
The Mars Observer mission is expected to yield more than 600
billion bits of scientific data, many times the amount of data
returned by all previous missions, both American and Russian, to
Mars.
Mars Observer will examine the entire planet, from the
ionosphere, an envelope of charged particles surrounding Mars,
down through the atmosphere to the surface and deep into the
interior. Scientists will glean valuable new information on
daily and seasonal weather patterns, geological features, and the
migration of water vapor over a complete Martian year.
As the primary mission winds down in late 1995, the Mars
Observer science team will participate in a collaborative effort
of international cooperation. The Mars Observer spacecraft
carries a radio system supplied by the French Centre National
d'Etudes Spatiales (CNES) that will periodically receive and
relay data from small instrument packages landed on the Martian
surface by the Russian Mars '94 mission, which will arrive at
Mars in September 1995.
The Russian landed experiment packages will directly measure
the Martian atmosphere and surface properties. Data will be
relayed to both a Russian Mars '94 orbiter and the Mars Observer
spacecraft. Once received, the data will be stored and processed
for relay back to Earth. The Russian instrument packages are
designed to operate for several years.
If Mars Observer is still operating as late as 1997, the
spacecraft may support a second Russian mission, called the Mars
'96 mission. The Mars '96 mission is being designed to release a
balloon into the Martian atmosphere and possibly deploy landed
stations or rovers that could explore the Martian surface either
through remote control from Earth or under autonomous computer
control. Following a launch in 1996, the Mars '96 spacecraft
would reach Mars in 1997.
Glenn E. Cunningham of the Jet Propulsion Laboratory is the
Mars Observer project manager. Dr. Arden Albee of the California
Institute of Technology is the project scientist. Dr. Sam Dallas
of the Jet Propulsion Laboratory is the mission manager. William
C. Panter of NASA Headquarters is the program manager and Dr.
Bevan M. French of NASA Headquarters is the program scientist.
The spacecraft was built under contract to NASA and JPL by
the Martin Marietta Astro-Space Division (formerly General
Electric) in Princeton, N.J. NASA's Deep Space Network is
supporting mission operations and tracking of the spacecraft
throughout the primary mission.
The Jet Propulsion Laboratory in Pasadena, Calif., manages
the Mars Observer mission for the Solar System Exploration
Division of NASA's Office of Space Science, Washington, D.C.
##### MARS OBSERVER ORBIT INSERTION MANEUVERS
MOI MOI is the first orbit insertion maneuver that
8/24/93 brakes the spacecraft into the elliptical capture
orbit. Once performed, the spacecraft will be in a
three-day (75-hour) orbit around Mars. MOI occurs
at 1:40 p.m. PDT on Aug. 24, 1993.
ECM-1 The first trim maneuver to the elliptical capture
9/4/93 orbit is scheduled for 10.4 days after MOI. ECM-1
will put the spacecraft in a three-day "drift
orbit" to distinguish it from the capture orbit.
ECM-2 The second trim maneuver is scheduled for 11.3
9/15/93 days after ECM-1 to lower the spacecraft into the
one-day drift orbit. The spacecraft will be
maintained in the drift orbit for the next 32
days, until the 2 p.m. solar orientation is nearly
reached.
ECM-3 The third trim maneuver occurs 10 days before the
10/7/93 TLO-1 maneuver. This is a small statistical
maneuver to clean up errors in the drift orbit.
TLO-1 TLO-1 is the third braking maneuver, which lowers
10/17/93 the spacecraft from the elliptical drift orbit to
the 4.2-hour orbit. The 4.2-hour period of this
intermediate orbit was selected to take out
about half of the energy required to
reach the mapping orbit.
TLO-2 TLO-2 is the fourth and last large braking
10/28/93 maneuver to lower the spacecraft into the mapping
orbit. It will occur 11 days after TLO-1. Because
most of the bipropellant is being expended, this
maneuver has the highest acceleration level
of the mission.
OCM-1 The Orbit Change Maneuver is the final orbit
11/8/93 maneuver to correct any errors in the mapping
orbit. OCM-1 will be performed 11 days after
TLO-2.
12/20/93 Solar conjunction.
-1/3/94
-END OF GENERAL RELEASE- MARS OBSERVER SCIENCE OBJECTIVES
The Mars Observer mission will study the geology,
geophysics, weather and climate of Mars. The mission's primary
objectives are to identify and map the chemical and mineral
composition of the surface; measure the topography of surface
landforms; define the gravitational field; and search for a
planetary magnetic field. The mission will also determine the
distribution, abundance, sources and destinations of carbon
dioxide, water and dust over a seasonal cycle, and will measure
the atmospheric temperature and the water and dust content in the
atmosphere.
Since all of these objectives involve global mapping, the
mission will provide scientists with a global portrait of Mars as
it exists today through a scientifically focused set of
experiments. The spacecraft's instruments are similar to those
now used to study the Earth. During its 687-day mapping mission,
Mars Observer will return more than 600 billion bits of
scientific data -- more than that returned by all previous
missions to Mars.
MISSION DESIGN
The near-polar orbit that was chosen for the Mars Observer
mission is low enough to allow close-range study of Mars, but
high enough so that the atmosphere does not drag excessively on
the spacecraft. The orbit is also sun-synchronous; the
spacecraft will pass over Mars' equator at the same local time
during each orbit -- about 2 p.m. on the day side and about 2
a.m. on the night side. This orbit is essential for a number of
measurements, as it helps distinguish daily atmospheric
variations from longer term, seasonal variations.
During the mission's mapping cycle, data reception from the
spacecraft and command updates to the spacecraft and individual
science instruments will be conducted on a daily basis.
The seven instruments on Mars Observer will gather data
until November 1995. Near the end of its prime mission in the
fall of 1995, Mars Observer will be joined at Mars by the Russian
"Mars '94" spacecraft. Mars Observer is equipped to relay data
to Earth from several penetrators and experiment packages that
the Russians plan to place on the Martian surface. The radio-
receiver equipment to accomplish this effort of international
cooperation was supplied by the Centre National d'Etudes
Spatiales (CNES) in France.
Once the primary mission is completed, the Mars Observer
mission may be extended further -- if the spacecraft and
instruments are still in good condition and if there is enough
fuel to control the spacecraft's altitude and orientation.
SPACECRAFT SCIENCE INSTRUMENTS
Mars Observer's battery of seven scientific instruments will
make an intense and long-term examination of Mars from orbit.
Collectively, the instruments cover much of the electromagnetic
spectrum and form a complementary array. Each instrument
produces sets of data that contribute to a wide variety of
scientific investigations.
Gamma Ray Spectrometer (GRS)
The Gamma Ray Spectrometer will measure the chemical
elements present on and near the surface of Mars with a surface
resolution of a few hundred kilometers. The data will be
obtained by measuring the intensities of gamma rays that emerge
from the Martian surface. These high-energy rays are created
from the natural decay of radioactive elements in Martian surface
materials and are also produced by the interaction of cosmic rays
with the atmosphere and surface.
By observing the number and energy of these gamma rays, it
is possible to determine the chemical composition of the surface,
element by element.
Mars Observer Camera (MOC)
The Mars Observer Camera system will photograph the Martian
surface with the highest resolution ever accomplished by an
orbiting civilian spacecraft. (Resolution is a measure of the
smallest object that can be seen in an image.)
Low-resolution global images of Mars will also be acquired
each day using two wide-angle cameras operated at 7.5-kilometer
(4.7-mile) resolution per picture element. These same cameras
will acquire moderate-resolution photographs at 240 meters (787
feet) per pixel.
A separate camera will acquire very-high-resolution images
at 1.4 meters (4.6 feet) per pixel for features of special
interest. Each of these camera systems uses a line array of
several thousand detectors, and the motion of the spacecraft, to
create the images.
The low-resolution camera system will capture global views
of the Martian atmosphere and surface so that scientists may
study the Martian weather and related surface changes on a daily
basis. Moderate-resolution images will monitor changes in the
surface and atmosphere over hours, days, weeks, months and years.
The high-resolution camera system will be used selectively,
because of the high data volume required for each image.
Thermal Emission Spectrometer (TES)
The Thermal Emission Spectrometer will measure infrared
thermal radiation emitted from the Martian atmosphere and
surface. From these measurements the thermal properties of
Martian surface materials and their mineral content may be
determined. When viewing the surface beneath the spacecraft, the
spectrometer has six fields of view, each covering an area of 3
by 3 kilometers (1.9 by 1.9 miles).
The spectrometer (a Michelson interferometer) will determine
the composition of surface rocks and ice and map their
distribution on the Martian surface. Other capabilities of the
instrument will investigate the advance and retreat of the polar
ice caps, as well as the amount of radiation absorbed, reflected
and emitted by these caps. The distribution of atmospheric dust
and clouds will also be examined over the four seasons of the
Martian year.
Pressure Modulator Infrared Radiometer (PMIRR)
This radiometer will measure the vertical profile of the
tenuous Martian atmosphere by detecting infrared radiation from
the atmosphere itself. For the most part, the instrument will
measure infrared radiation from the limb, or above the horizon,
to provide high-resolution (5-kilometer or 3-mile) vertical
profiles through the atmosphere.
The measurements will be used to derive atmospheric pressure
and determine temperature, water vapor and dust profiles from
near the surface to as high as 80 kilometers (50 miles) above the
surface. Using these measurements, global models of the Martian
atmosphere, including seasonal changes that affect the polar
caps, can be constructed and verified.
Mars Observer Laser Altimeter (MOLA)
The Mars Observer Laser Altimeter uses a very short pulse of
light emitted by a laser to measure the distance from the
spacecraft to the surface with a precision of several meters.
These measurements of the topography of Mars will provide a
better understanding of the relationship among the Martian
gravity field, the surface topography and the forces responsible
for shaping the large-scale features of the planet's crust.
Radio Science
The Radio Science investigation will use the spacecraft's
telecommunication system and the giant parabolic (dish-shaped)
antennas of NASA's Deep Space Network to probe the Martian
gravity field and atmosphere. These measurements will help
scientists determine the structure, pressure and temperature of
the Martian atmosphere.
Each time the spacecraft passes behind the planet or
reappears on the opposite side, its radio beam will pass through
the Martian atmosphere briefly on its way to Earth. The way in
which the radio waves are bent and slowed will provide data about
the atmospheric structure at a much higher vertical resolution
than any other Mars Observer experiment.
During that part of the orbit when the spacecraft is in view
of Earth, precise measurements of the frequency of the signal
received at the ground tracking stations will be made to
determine the velocity change (using the Doppler effect) of the
spacecraft in its orbit around Mars. These Doppler measurements,
along with measurements of the distance from the Earth to the
spacecraft, will be used to navigate the spacecraft and to study
the planet's gravitational field.
Gravitational field models of Mars will be used along with
topographic measurements to study the Martian crust and upper
mantle. By the end of the mission, as a result of the low
altitude of the orbit and the uniform coverage of Mars Observer,
scientists will have obtained unprecedented global knowledge of
the Martian gravitational field.
Magnetometer and Electron Reflectometer (MAG/ER)
Mars is now the only planet in the solar system, aside from
Pluto, for which a planetary magnetic field has not yet been
detected. In addition to searching for a Martian planetary
magnetic field, this instrument will also scan the surface
material for remnants of a magnetic field that may have existed
in the distant past. The magnetic field generated by the
interaction of the solar wind with the upper atmosphere of Mars
will also be studied.
Mars Relay Experiment
The spacecraft also carries a radio system supplied by the
French Centre National d'Etudes Spatiales (CNES) to support
robotic missions being implemented by the Russians.
The present Russian plan is to launch two spacecraft, one in
1994 and the other in 1996. The first would deploy penetrators
into the surface of Mars and land small experiment packages on
the surface for direct sampling of both the atmosphere and the
surface. The associated Mars Observer relay equipment consists
of a transmitter/receiver that will periodically receive and
relay to Earth scientific and engineering data from these landed
packages. In 1996 the Russians plan to launch instrument
packages, a balloon and, perhaps, a surface rover that would
relay information back to Mars Observer if the spacecraft is
still operational in late 1997.
THE SPACECRAFT SYSTEM
The Mars Observer spacecraft uses, where possible, existing
Earth-orbiting satellite component designs. The craft's main
body is shaped like a box and is about 1.1 meters (3.25 feet)
high, 2.2 meters (7.0 feet) wide, and 1.6 meters (5.0 feet) deep.
Mars Observer was built by Martin Marietta (formerly General
Electric) Astro-Space in Princeton, N.J.
With its fuel, the spacecraft and its science instruments
weigh about 2,565 kilograms (5,655 pounds). The spacecraft has a
three-year design lifetime and is equipped with one large solar
array, consisting of six 183 x 219 x 9.1-centimeter (6 x 7.2 x
0.3-foot) solar panels.
At launch, the spacecraft's main communication antenna,
instrument booms and solar array were folded close to the
spacecraft. During the cruise phase these structures were
partially extended. The two 6-meter (20-foot) instrument booms
carry two of Mars Observer's seven scientific instruments: the
Magnetometer and Electron Reflectometer and the Gamma Ray
Spectrometer.
After the Mars Observer spacecraft reaches its mapping orbit
at Mars, the solar array and instrument booms will be fully
unfolded. The main communication antenna -- a 1.5-meter (5-foot)
diameter parabolic antenna -- will be raised on a 5.3-meter (17-
foot) boom and rotated to have a clear view of Earth. The
spacecraft will then power its instruments to begin conducting
the mission experiments.
MAPPING CYCLE
In its near-circular mapping orbit, the Mars Observer
spacecraft will rotate once per orbit in order to keep the
instruments pointed at the planet. This will allow all the
instruments to view the planet continuously and uniformly during
the entire Martian year. The spacecraft, instruments and mission
were designed so that sufficient resources, especially of power
and data rate, are available to power all instruments as they
collect data simultaneously and continuously on both the day and
night sides of the planet. The camera system takes photos only
on the day side and will acquire additional images every three
days during real-time radio transmissions to the Deep Space
Network.
The rotation and orientation of the spacecraft are
controlled by horizon sensors, a star sensor, gyroscopes and
reaction wheels, as is common on Earth-orbiting satellites. The
horizon sensors, adapted from a terrestrial design, continuously
locate the horizon, providing control signals to the spacecraft.
The star sensor will be used for attitude control during the 11-
month cruise and as a backup to the horizon sensors during the
mapping orbit.
Once during each 118-minute orbit, the spacecraft will enter
the shadow of Mars and rely on battery power for about 40
minutes. The battery is charged by the spacecraft's large solar
panel, which generates more than a kilowatt of power when it is
in the sunlight to operate spacecraft subsystems and instruments.
Control of the spacecraft and instruments is accomplished
through the use of onboard microprocessors and solid-state
memories. Scientific and engineering data are stored on tape
recorders for daily playback to Earth. Additional data
operations will allow information to be returned in real-time
from selected instruments whenever Earth is in view.
The lifetime of the spacecraft will most likely be
determined by the supply of attitude-control fuel and the
condition of the batteries. The following table summarizes some
of the important performance features of the Mars Observer
spacecraft.
SPACECRAFT STATISTICS
GENERAL
Design Life 3 years
Mapping Orbit Mars polar, nearly circular
Altitude Above Mars 378 km (234 miles), nominal
Key Features Seven science instruments
(two mounted on 6-m booms)
Bi- and monopropulsion systems
Three-axis control system
(highly stabilized)
Semiautonomous operation
(stores up to 2000 commands)
Reliability Redundancy used to avoid
single-point failures
Weight at launch
Dry (with payload) 1,125 kg (2,480 lb)
Fuel 1,440 kg (3,175 lb)
Total Weight 2,565 kg (5,655 lb)
Size (launch configuration):
Length 1.6 m (5.0 ft)
Width 2.2 m (7.0 ft)
Height 1.1 m (3.25 ft)
COMMUNICATIONS
Command Rate 12.5 commands/s (max)
Uplink Data Rate 500 bits/s (max)
Downlink Data Rate 85.3 kilobits/s (max)
Antennas 1.5-m-diam. high-gain parabolic
articulating (on 5.3-m boom)
Three low-gain
Downlink RF Power 44 watts
Tape Recorders 1.38 x 10^9-bit capacity
PROPULSION
Bipropellant System Monomethyl hydrazine
and nitrogen tetroxide
Monopropellant System Hydrazine
Thrusters (20 total) (4) 490 N
(4) 22 N
(8) 4.5 N (orbit trim)
(4) 0.9 N (momentum unloading
and steering)
Total Propellant Weight 1,346 kg (2,961 lb)
ATTITUDE AND ARTICULATION CONTROL
Pointing Accuracy Control: 10 mrad
Knowledge: 3 mrad
Pointing Stability 1 mrad (for 0.5 s)
3 mrad (for 12 s)
ELECTRICAL POWER
Solar Array 6 panels, each 3.7 x 7 meters
Array Output Power 1,130 watts
Batteries 42-amp-hr NiCd (2)
Electronics Bus voltage regulation
Definitions:
mrad = milliradian (~ 0.057 degree)
N = newton (~ 0.225 lb force)
SCIENCE OPERATIONS
The Mars Observer mission operations at the Jet Propulsion
Laboratory will be supported by NASA's Deep Space Network and the
JPL Advanced Multimission Operations System. The 34-meter (111-
foot), high-efficiency subnetwork, the newest of the Deep Space
Network antenna subnets, will provide daily uplink and downlink
communications with the spacecraft at X-band frequencies of 8.4
gigahertz. The 70-meter (230-foot) antenna network will also
provide periodic very-long-baseline interferometry and real-time,
high-rate telemetry and radio science support to the mission.
The instrument scientists will remain at their home
institutions, from which they will access Mars Observer data via
a project database at JPL. Using workstations and electronic
communications links, scientists will also be connected to the
mission planning activities at JPL. In the same way, data
products returned to the JPL database from the home institution
for each of the instruments will be sent electronically to other
investigators at their home institutions. This will allow
scientists to have ready access to science data without moving to
JPL for the duration of the mission.
More than 80 workstations will be connected to the project
database at JPL, a centralized repository for downlink science
and engineering telemetry data, ancillary data including
navigation data, and uplink command and sequence data. This
database, with about 30 gigabytes of on-line storage, will be
electronically available to the science instrument investigators
via NASCOM data links. The database will allow investigators to
analyze their instrument data at their home institutions.
During the mapping phase, the instrument investigations will
return processed science data products to the database at JPL for
access by the interdisciplinary scientists and the other
investigation teams. The Mars Observer mission is expected to
return more than 600 billion bits of scientific data to Earth --
more than that returned by all previous missions to Mars and, in
fact, roughly equal to the total amount of data returned by all
planetary missions since the beginning of planetary exploration.
SOME SALIENT FACTS
ABOUT MARS OBSERVER
Speed in Earth orbit
(with respect to Earth) 7.73 km/s (17,300 mph)
Speed at TOS burnout
(with respect to Earth) 11.5 km/s (25,700 mph)
Average speed during cruise
(with respect to Sun) 25.0 km/s (56,000 mph)
Speed before Mars orbit insertion
maneuver (with respect to Mars) 5.28 km/s (11,800 mph)
Speed after Mars orbit insertion
maneuver (with respect to Mars) 4.56 km/s (10,200 mph)
Speed in mapping orbit
(with respect to Mars) 3.35 km/s (7,500 mph)
Distance traveled between Earth and Mars 7.24 x 10^8 km
(450 million miles)
Distance from Earth at Mars arrival 3.4 x 10^8 km
(210 million miles)
Distance from Earth during Min: 10^8 km (62 Mmi)
mapping phase Max: 3.7 x 10^8 km (230 Mmi)
Time for command to reach spacecraft Min: 5.5 minutes
during mapping phase Max: 20.5 minutes
Maximum acceleration on spacecraft (postlaunch) 0.1 G
(occurs during transfer to low orbit)
Navigation target diameter at Mars 480 km (300 miles)
(less than 1/10 of planet diameter)
MARS OBSERVER INVESTIGATORS
Gamma Ray Spectrometer (GRS)
TEAM LEADER: William V. Boynton, University of Arizona, Tucson,
Ariz.
James R. Arnold, University of California at San Diego, San
Diego, Calif.
Peter Englert, San Jose State University, San Jose, Calif.
William C. Feldman, Los Alamos National Laboratory, Los Alamos,
New Mexico
Albert E. Metzger, Jet Propulsion Laboratory, Pasadena, Calif.
Robert C. Reedy, Los Alamos National Laboratory, Los Alamos, New
Mexico
Steven W. Squyres, Cornell University, Ithaca, New York
Jacob L. Trombka, NASA Goddard Space Flight Center, Greenbelt,
Md.
Heinrich Wanke, Max Planck Institute, Mainz, Germany
Johannes Bruckner, Max Planck Institute, Mainz, Germany
Darrell M. Drake, Los Alamos National Laboratory, Los Alamos, New
Mexico
Larry G. Evans, Computer Sciences Corporation, Lanham-Seabrook,
Md.
John G. Laros, Los Alamos National Laboratory, Los Alamos, New
Mexico
Richard D. Starr, Catholic University, Washington, D.C.
Yuri A. Surkov, Vernadsky Institute, Russia
Mars Observer Camera (MOC)
PRINCIPAL INVESTIGATOR: Michael C. Malin, Malin Space Science
Systems, Inc., San Diego, Calif.
G. Edward Danielson Jr., California Institute of Technology,
Pasadena, Calif.
Andrew P. Ingersoll, California Institute of Technology,
Pasadena, Calif.
Laurence A. Soderblom, U.S. Geological Survey, Flagstaff, Ariz.
Joseph Veverka, Cornell University, Ithaca, New York
Genry A. Avenesov, Space Research Institute, Russia
Merton E. Davies, The RAND Corporation, Santa Monica, Calif.
William K. Hartmann, Planetary Science Institute, Tucson, Ariz.
Philip B. James, University of Toledo, Toledo, Ohio
Alfred S. McEwen, U.S. Geological Survey, Flagstaff, Ariz.
Peter C. Thomas, Cornell University, Ithaca, New York
Thermal Emission Spectrometer (TES)
PRINCIPAL INVESTIGATOR: Philip R. Christensen, Arizona State
University, Tempe, Ariz.
Donald A. Anderson, Arizona State University, Tempe, Ariz.
Stillman C. Chase, consultant, Santa Barbara, Calif.
Roger N. Clark, U.S. Geological Survey, Denver, Colo.
Hugh H. Kieffer, U.S. Geological Survey, Flagstaff, Ariz.
Michael C. Malin, Malin Space Science Systems, Inc., San Diego,
Calif.
John C. Pearl, NASA Goddard Space Flight Center, Greenbelt, Md.
Todd R. Clancy, University of Colorado, Boulder, Colo.
Barney J. Conrath, NASA Goddard Space Flight Center, Greenbelt,
Md.
Ruslan O. Kuzmin, Vernadsky Institute, Russia
Ted L. Roush, San Francisco State University, San Francisco,
Calif.
Arnold S. Selivanov, Institute for Space Devices Engineering,
Russia
Pressure Modulator Infrared Radiometer (PMIRR)
PRINCIPAL INVESTIGATOR: Daniel J. McCleese, Jet Propulsion
Laboratory, Pasadena, Calif.
Robert D. Haskins, Jet Propulsion Laboratory, Pasadena, Calif.
Conway B. Levoy, University of Washington, Seattle, Wash.
David A. Paige, University of California at Los Angeles, Los
Angeles, Calif.
John T. Schofield, Jet Propulsion Laboratory, Pasadena, Calif.
Fredric Taylor, Oxford University, England
Richard W. Zurek, Jet Propulsion Laboratory, Pasadena, Calif.
Michael D. Allison, NASA Goddard Space Flight Center, Greenbelt,
Md.
Jeffrey R. Barnes, Oregon State University, Corvallis, Ore.
Terry Z. Martin, Jet Propulsion Laboratory, Pasadena, Calif.
Peter L. Read, Oxford University, England
Mars Observer Laser Altimeter (MOLA)
PRINCIPAL INVESTIGATOR: David E. Smith, NASA Goddard Space Flight
Center, Greenbelt, Md.
Herbert V. Frey, NASA Goddard Space Flight Center, Greenbelt, Md.
James B. Garvin, NASA Goddard Space Flight Center, Greenbelt, Md.
James W. Head, Brown University, Providence, Rhode Island
Duane Muhleman, California Institute of Technology, Pasadena,
Calif.
Gordon H. Pettengill, Massachusetts Institute of Technology,
Cambridge, Mass.
Roger J. Phillips, Washington University, St. Louis, Mo.
Sean C. Solomon, Carnegie Institute, Washington, D.C.
Maria T. Zuber, NASA Goddard Space Flight Center, Greenbelt, Md.
H. Jay Zwally, NASA Goddard Space Flight Center, Greenbelt, Md.
W. Bruce Banerdt, Jet Propulsion Laboratory, Pasadena, Calif.
Thomas C. Duxbury, Jet Propulsion Laboratory, Pasadena, Calif.
Radio Science (RS)
TEAM LEADER: G. Leonard Tyler, Stanford University, Stanford,
Calif.
Georges Balmino, Centre National d'Etudes Spatiales (CNES),
France
David Hinson, Stanford University, Stanford, Calif.
William L. Sjogren, Jet Propulsion Laboratory, Pasadena, Calif.
David E. Smith, NASA Goddard Space Flight Center, Greenbelt, Md.
Richard Woo, Jet Propulsion Laboratory, Pasadena, Calif.
Effraim L. Akim, Keldysh Institute of Applied Mathematics, Russia
John W. Armstrong, Jet Propulsion Laboratory, Pasadena, Calif.
Michael F. Flasar, NASA Goddard Space Flight Center, Greenbelt,
Md.
Richard A. Simpson, Stanford University, Stanford, Calif.
Magnetometer and Electron Reflectometer (MAG/ER)
PRINCIPAL INVESTIGATOR: Mario H. Acuna, NASA Goddard Space Flight
Center, Greenbelt, Md.
Kinsey S. Anderson, University of California at Berkeley,
Berkeley, Calif.
Sigfried Bauer, University of Graz, Austria
Charles W. Carlson, University of California at Berkeley,
Berkeley, Calif.
Paul Cloutier, Rice University, Houston, Texas
John E. P. Connerney, NASA Goddard Space Flight Center,
Greenbelt, Md.
David W. Curtis, University of California at Berkeley, Berkeley,
Calif.
Robert P. Lin, University of California at Berkeley, Berkeley,
Calif.
Michael Mayhew, National Science Foundation, Washington, D.C.
Norman F. Ness, University of Delaware, Newark, Del.
Henri Reme, University of Paul Sabatier, France
Peter J. Wasilewski, NASA Goddard Space Flight Center, Greenbelt,
Md.
Michel Menvielle, University of Paris, Paris, France
Diedrich Mohlmann, Deutsche Luft und Raumfahrt Gesellschaft,
Germany
James A. Slavin, NASA Goddard Space Flight Center, Greenbelt, Md.
Alexander V. Zakharov, Space Research Institute, Russia
INTERDISCIPLINARY SCIENTISTS
Raymond E. Arvidson, Washington University, St. Louis, Mo.
Bruce Fegley Jr., Washington University, St. Louis, Mo.
Michael H. Carr, U.S. Geological Survey, Menlo Park, Calif.
Alexander T. Bazilevsky, Vernadsky Institute, Russia
Matthew P. Golombek, Jet Propulsion Laboratory, Pasadena,
Calif.
Harry Y. McSween Jr., University of Tennessee, Knoxville, Tenn.
Andrew P. Ingersoll, California Institute of Technology,
Pasadena, Calif.
Howard Houben, NASA Ames Research Center, Mountain View,
Calif.
Bruce M. Jakosky, University of Colorado, Boulder, Colo.
Leonid V. Ksanfomality, Space Research Institute, Russia
Aaron P. Zent, Search for Extraterrestrial Intelligence
(SETI) Institute, Mountain View, Calif.
James B. Pollack, NASA Ames Research Center, Mountain View,
Calif.
Robert M. Haberle, NASA Ames Research Center, Mountain View,
Calif.
Vasily I. Moroz, Space Research Institute, Russia
Laurence A. Soderblom, U.S. Geological Survey, Flagstaff, Ariz.
E. Ken Herkenhoff, Jet Propulsion Laboratory, Pasadena, Calif.
Bruce C. Murray, California Institute of Technology, Pasadena,
Calif.
#####
8/16/93 DEA
|
| 528.194 | | AUSSIE::GARSON | nouveau pauvre | Sun Aug 22 1993 22:13 | 4 |
| I heard on the radio that they had lost contact with MO. Does anyone
have further details?
Concerned of Sydney
|
| 528.195 | | ECADSR::BIRO | | Mon Aug 23 1993 12:27 | 74 |
| From: US1RMC::"baalke@kelvin.Jpl.Nasa.Gov" "Ron Baalke" 22-AUG-1993 15:00:32.50
To: sci-space-news@uunet.uu.net
CC:
Subj: Mars Observer Loses Communications with Earth
Donald Savage
Headquarters, Washington, D.C. August 22, 1993
(Phone: 202/358-1600)
Bob MacMillin
Jet Propulsion Laboratory, Pasadena, Calif.
(Phone: 818/354-5011)
MISSION ADVISORY
MARS OBSERVER SPACECRAFT LOSES COMMUNICATIONS WITH EARTH
On Saturday evening, August 21st, communications were lost with
the Mars Observer spacecraft as it neared to within 3 days of the
planet Mars. Engineers and mission controllers at NASA's Jet
Propulsion Laboratory (JPL), Pasadena, Calif., responded with a
series of backup commands to turn on the spacecraft's transmitter
and to point the spacecraft's antennas toward Earth. As of 11:00
a.m. EDT on Sunday, August 22nd, no signal from the spacecraft
had been received by tracking stations around the world.
Mars Observer has an on-board sequence that will issue the proper
commands to execute the critical Mars orbit insertion events on
Tuesday afternoon, August 24th, assuming that the spacecraft is
operating properly. This on-board sequence is designed to assure
that the spacecraft is captured into Mars orbit even if ground
controllers cannot communicate with the craft.
Communications were lost during an activity in which the tanks in
the propulsion system were being pressurized. This system will
be used to slow the spacecraft's speed and allow it to be
captured into Mars orbit. Controllers have no reason to believe
that the propulsion system has not been properly pressurized.
Engineers and mission controllers are continuing with additional
attempts to re-establish communication. Commands are being
issued every 20 minutes instructing the spacecraft to switch to a
wider beam low-gain antenna and radio its status back to JPL.
- end -
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
% ====== Internet headers and postmarks (see DECWRL::GATEWAY.DOC) ======
% Received: by us1rmc.bb.dec.com; id AA05598; Sun, 22 Aug 93 15:03:34 -0400
% Received: by inet-gw-1.pa.dec.com; id AA23591; Sun, 22 Aug 93 12:04:48 -0700
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% Received: by news.arc.nasa.gov id AA17120 (5.65c/IDA-1.4.4 for usenet-space-news@arc.nasa.gov); Sun, 22 Aug 1993 11:00:08 -070
% Newsgroups: sci.space.news
% Path: ames!dont-send-mail-to-path-lines
% From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
% Subject: Mars Observer Loses Communications with Earth
% Message-Id: <22AUG199317544295@kelvin.jpl.nasa.gov>
% To: sci-space-news@uunet.uu.net
% Followup-To: sci.space
% News-Software: VAX/VMS VNEWS 1.41
% Keywords: Mars Observer, JPL
% Sender: digester@news.arc.nasa.gov
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% Date: Sun, 22 Aug 1993 17:54:00 GMT
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% Lines: 47
|
| 528.196 | | SKYLAB::FISHER | Carp Diem : Fish the Day | Mon Aug 23 1993 13:04 | 18 |
| A radio report this morning said that NASA says "There is no reason to think
that MO will not execute its instructions to go into orbit properly on Tuesday
and then report back to Earth the next day." This is an approximate quote.
I'm not sure what is supposed to happen on Wednesday (the contacting earth bit).
Perhaps a new program takes over? This may be hype. After all, at least two
allegedly independent subsystem appear to have failed (high gain and omni data).
Or I suppose it could be the computer.
Let's keep our fingers crossed. I hope my pessimism is based on lack of
knowledge.
BTW, another unfortunate coincidence: I assume they have declared a spacecraft
emergency and taken a lot of the time on the DSN. Coming up on Thursday:
Galileo's flyby of Ida. Of course the image will be taped and not sent back
immediately anyway, I suppose.
Burns
|
| 528.197 | Mars Observer Update -- 08/19/93 | PONIL::J_BUTLER | E pur, si muove... | Mon Aug 23 1993 13:23 | 37 |
|
[Ed Note: This was sent before communications were lost with
Mars Observer. -jb]
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 19, 1993
MOI -5 Days
The spacecraft is stable in Array Normal Spin, with X-Band communication via
the High Gain Antenna; uplink at 125 bps, downlink at the 2 kbps Engineering
data rate. One Way Light Time is 18 minutes and 51 seconds. The Payload Data
System, Gamma Ray Spectrometer, and Magnetometer/Electron Reflectometer are
powered on. Indications are that all spacecraft subsystems and the instrument
payload are performing well. Flight Sequence T1-A is active.
Preparations continue for Mars Orbit Insertion on Tuesday, 8/24 at about
1:24 PM PDT. The final T1-B load containing the maneuver execution parameters
is scheduled to be uplinked on Friday, 8/20. T1-B goes active at 8:19 AM
Monday, 8/23. T1-B will command the spacecraft to burn attitude and start
ignition of two of the four 490 Newton thrusters for about 29 minutes.
First indications of maneuver performance should be available to the flight
team by approximately 2:45 PM.
Today the Spacecraft is 1,108,094 km (688,538 miles) from Mars, travelling at a
speed of 2.47 kps (5,520 mph) with respect to Mars.
MOI = Mars Orbit Insertion
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.198 | Mars Observer Update -- 08/20/93 | PONIL::J_BUTLER | E pur, si muove... | Mon Aug 23 1993 13:24 | 34 |
|
[Ed Note: This was sent before communications were lost with
Mars Observer. -jb]
Forwarded from the Mars Observer Project
MARS OBSSERVER STATUS REPORT
August 20, 1993
MOI -4 Days
The spacecraft is stable in Array Normal Spin, with X-Band communication via
the High Gain Antenna; uplink at 125 bps, downlink at the 2 kbps Engineering
data rate. One Way Light Time is 18 minutes and 54 seconds. The Payload Data
System, Gamma Ray Spectrometer, and Magnetometer/Electron Reflectometer are
powered on. Indications are that all spacecraft subsystems and the instrument
payload are performing well. Flight Sequence T1-A is active.
The final T1-B load containing the maneuver implementation file was uplinked
today at 12:00 Noon. Verification of successful uplink was received at 12:45
PM. T1-B goes active at 8:19 AM Monday, 8/23.
Today, the spacecraft is 891,120 km (553,716 mi) from Mars, travelling at a
speed of 2.47 kps (5525 mph) with respect to Mars.
MOI = Mars Orbit Insertion
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.199 | Can't Verify Pressurization w/o Comm... | PONIL::J_BUTLER | E pur, si muove... | Mon Aug 23 1993 13:30 | 17 |
| Re: .195
>Controllers have no reason to believe
>that the propulsion system has not been properly pressurized.
<sigh>
Unfortunately, they also can have no reason to believe that
it HAS been properly pressurized, since they can't communicate
with Mars Observer.
Sounds like a problem during tank pressurization to me.
I have a bad feeling about this one... (...I hope I'm dead wrong...)
Regards,
John B.
|
| 528.200 | MO image rights, releases (here's hoping) | VERGA::KLAES | Quo vadimus? | Mon Aug 23 1993 14:12 | 291 |
| From: US1RMC::"baalke@kelvin.Jpl.Nasa.Gov" "Ron Baalke" 22-AUG-1993
To: sci-space-news@uunet.uu.net
CC:
Subj: Proprietary Rights to Mars Observer Camera Images
This posting is from Mike Malin, Principal Investigator of the Mars
Observer Camera, in response to the net discussions that have been
going on during the past two weeks.
Please do not respond to the e-mail address above. My only link
to the network is through this third party and I don't want them
deluged with replies. I do read the net occassionally and will try to
respond when time and interest permit.
Topic: Proprietary Rights to Mars Observer Camera images
The first thing you must recognize is the difference between a
facility instrument and a Principal Investigator instrument. With the
former, NASA or its designated field center (JPL in the case of
planetary missions) contracts to buy the instrument, either from
industry or from within its own facilities. In the latter case, NASA
contracts with an individual (actually, his institution) for an
investigation (more on this in a moment).
Since Mariner 6 & 7 in 1969, all planetary S/C cameras have been facility
instruments built by JPL to specifications developed interactively
with a group of scientists (a facility team) who proposed separately
to conduct specific science tasks. Generally, these scientists had
very little knowledge or interest in the hardware, and were more than
content to let the engineers at JPL decide what capabilities were to
be incorporated. The scientists were guaranteed "first rights" to the
data in return for devoting much of their "discretionary" research
time (i.e., time not supported by teaching or other institutional
duties) to the project. Most of my colleagues spend between 3 and 5
times as much time on their flight project commitments as they are
paid for, including considerable travel time. The ancillary
advantages of flight project participation (computing hardware,
augmented staff support, prestige) are less compensation than
perquisites (i.e., they result in "nice" improvements in one's ability
to conduct research, but usually not anything truly "enabling"), and
often do not compensate for the loss of time to devote to science.
When the Mars Geoscience/Climatology Orbiter Science Working
Group did not recommend a facility camera be flown on that mission
(which was renamed Mars Observer later), that allowed, for the first
time in 25 years, for a PI camera. In PI instruments, NASA selects
investigations, not just instruments. A total package must be
proposed, including the development of the instrument (and its
testing), its operations and data collection, and the processing and
interpretation of the data. In PI instruments, NASA buys knowledge,
not hardware or data. Proposals that seek to provide less than this
whole are considered "unresponsive" and are often returned without
consideration.
For a PI, the work effort is even greater than for a facility team
leader or member. The compensation is somewhat better (I ended up
being paid probably 80% of my time by MOC), but the hours are even
more monsterous. I've worked 60-80 hr weeks for most of the past 6
years, and much of my team averaged 50-60 hrs during that same time
(remember, as non-exempt salaried employees, we're only paid for 40
hrs). True, I now have a staff of 14 (before I had 1) and a wealth of
computer hardware, but my science output for the past six years has
been pitiful (hopefully, though, that's about to change). So what is the
inducement? Well, there are at least four (not in any particular order):
1. I get to do it MY way. Not really, of course. When you have a
engineering team, you do it their way (or your stupid). But you do
get considerably greater responsivity from a team you've hand-picked
and who work directly for and with you, than you might from a more
distant (both in space and time) group selected independently by NASA.
This leads to a remarkably greater instrument capability, since you
can trade off risk and performance directly, without intermediaries.
2. I get to control what is actually done with the instrument. Thus,
specific science topics near and dear to my heart are those that get
precedent. Laying to rest some misconceptions about Mars that have
propagated into the literature can be quite satisfying.
3. I get to be the first to see many new things about a planet I've
studied for almost 25 years.
4. I get to etablish the new precedents in the literature (for better
or worse). This is a part of the story of the much maligned
proprietary rights period.
There are a couple of other reasons for the proprietary rights period
that are induced by our contract with NASA. First, NASA only wants to
archive the data once. So they want it "bested" (all end-to-end data
dropouts that can be fixed should be fixed), they want the final
ancillary information (pointing, spacecraft position, etc.), they want
a detailed "experimenter's notebook" (why was each datum collected,
was the collection successful, is it what was requested, etc.), and
they want it all in a format that can be easily transferred to the
Planetary Data System which, in concert with the National Space
Science Data Center, is responsible for archiving and disceminating
planetary mission data to interested scientists and lay persons.
Second, NASA requires us to deliver results, not just data. So we are
not in accord with our contracts unless we provide interim science
reports on an agreed upon schedule. Given budget limitations that
lead to personnel limitations, a certain period of time is needed to
both validate the data and prepare the preliminary science reports.
Previous missions have had 1 year proprietary rights periods, and
Voyager took almost 2 years to get the initial Jupiter data out to the
general community. On the other hand, Mars Observer's "standard"
release is six months from receipt, with the following kluge resulting
from scheduling issues and data infusion limitations of the PDS: the
first month's data will be available in month seven, the second
through sixth month's data will be available in month 13, the 7th
through 12th month's in month 19, etc. While I recognize this may be
irritating to some, it represents a reasonable compromise with the
realities of physical data systems and human nature.
To give you an idea of the magnitude of the problem from my
perspective, consider that MOC will take roughly 3 terabits of
decompressed image data in 687 days compared to Magellan's 3 terabits in
243 days, which means that MOC will acquire the same amount of data in
its standard mission as Magellan did in its. Granted, there is a rate
difference (about 1/3), but we're doing it with nearly a factor of 20
fewer people, and for a budget that's at least an order of magnitude
smaller (the difference is machines, not higher salaries). And we're
responsible for BOTH uplink and downlink planning and operations.
The bottom line on proprietary rights: as stated by several people on
the net, these rights are often viewed as an inducement to get good
people to work on projects. This is only part of the
explanation...NASA requires considerable work to be performed on the
data prior to their release (in a way, the data are out of NASA's
hands when released, and they want the data to be in the best, final
form at that time). The proprietary rights period will not prevent
the public from seeing many of the more interesting and important
discoveries from the mission (see accompanying message re: public
access to MOC data). It assures that the return on the initial
investment is maximized and prepares the material for further use.
From: US1RMC::"baalke@kelvin.Jpl.Nasa.Gov" "Ron Baalke" 22-AUG-1993
To: sci-space-news@uunet.uu.net
CC:
Subj: Public Access to Mars Observer Camera Images
This posting is from Mike Malin, Principal Investigator of the Mars
Observer Camera, in response to the net discussions that have been
going on during the past two weeks.
Please do not respond to the e-mail address above. My only link
to the network is through this third party and I don't want them
deluged with replies. I do read the net occassionally and will try to
respond when time and interest permit.
Topic: Public access to Mars Observer Camera images
First and foremost, you can all help by getting the word out that
there is NOTHING DIFFERENT about the public accessibility of the MOC
data from previous missions. If anything, access will be improved.
The "Face on Mars" crowd seems obsessed with some perceived
differences arising from the fact that the MOC is a PI instrument. As
I hope to show below, such obsession is unfounded.
There are several levels at which the public will have access to the
MOC data. These are 1) press releases, 2) public display, 3) NASA
Select displays, and 4) Planetary Data System (PDS) release.
Definition: "release" means material is in the public domain, and that
the MOC team has no control over its use. "display" means the data
are shown to the public for information sake, but are not yet in the
public domain.
1) Press releases: The Mars Observer Project Office at JPL, the JPL
Public Information Office, and NASA Headquarters are all committed to
getting information about Mars Observer out to the public. Because
Mars Observer operates as a distributed system (i.e., mission
operations is not centralized at JPL, but rather is distributed across
the country at the institutions of the experiment principal
investigators), this represents a formidable challenge. Each PI is
free to release whatever he wants from his experiment, whenever he
wants, and from his home institution. Our agreement is to inform our
colleagues across the country and at JPL of our intentions, but we are
not required to seek any authorization for such releases. JPL will
try to coordinate a few group releases, keyed to special events in the
mission.
From the MOC perspective, I hope to release many (dozens?) of
images over the course of the 687 day primary mission. Limitations on
these releases include: media interest, cost of reproduction, cost of
time to prepare the releases, etc. While most of you (by virtue of
the fact you're on the internet) have made the switch to volatile
communication, much of the world, including the media, have not.
Since we can't cater to one special interest group over another (e.g.,
computer types), we must provide our "product" in as broad a format as
possible.
There WILL be releases of ORIGINAL DIGITAL DATA in binary form.
The MOI-28 day image was an exception, not the rule by which future
releases are planned. My staff and I abhor rescanning, and do not
intend for our releases to be screwed up in that way. What happened at
MOI-28 is that the release was moved forward from the date we had
agreed upon (NASA was eager to try to get into the Friday papers
rather than Saturdays) and my co-investigation team of scientists, who
are not yet in residence (since real data acquisition doesn't start
until December), hadn't even seen the image yet. I wanted them to at
least have some view of it before the whole world had access to it
digitally, so I didn't provide JPL with a releasable digital-format
image. JPL PIO simply scanned it in on its own volition. In the
future, releases will be better coordinated and the digital and
hardcopy versions will be released simultaneously.
I should note, however, that the digital version will be EXACTLY
that used to generate the hardcopy (i.e., not raw). Raw data will be
released as part of our contractual obligation to archive and release
ALL of the data to the public domain after validation and initial
science analysis (See below, PDS release, and separate message on
proprietary rights).
In summary, press releases will occur as often, if not more so,
than was seen during any of the previous ORBITAL missions. Viking
released roughly 30-40 PR images per vehicle (2 orbiters, 2 landers)
over two years, and we will easily match or exceed that rate
(20/year). Voyagers had the advantage of short encounters and
concentrated media attention--don't expect that kind of coverage to
extend over a two year mission.
2) Public Display: I REALLY want to get the MOC data out in front of
the public, so on my own initiative, but with the enthusiastic support
of both the NASA Science Internet and the Mars Observer Project, I
have begun negotiating to provide a "live" digital video feed from my
facility to the National Air and Space Museum, to JPL's visitor's
center, and to NASA Headquarters. Other facilities (Kennedy Space
Center's, Johnson Space Center's, and Goddard Space Flight Center's
visitor's centers, etc.) may be included. This will be an automatic
rescaling of our canonical 2K X 2K pixel images to 480 X 480, with
ancillary information (location, image id, etc.) displayed in NTSC
format that will occur roughly in "realtime." NASA Select will
probably broadcast some of these displays (see below).
Images shown via this display are still proprietary, meaning we
haven't validated them nor performed initial science analysis. They
are not released and cannot be reproduced or recorded digitally
without our permission (basically, any reproduction would constitute
"release"). Video recording by media is allowed, as is such recording
by the public of any broadcasts. The displays are volatile, however,
and once the image is gone, it cannot be recovered. This is EXACTLY
like the broadcasts of Voyager data during its outer planet
encounters. I have gone to considerable trouble to provide this
capability, since it isn't inherent in the distributed data system of
Mars Observer.
3) NASA Select Displays: NASA Select satellite television will carry
some amount of Mars Observer mission coverage, the exact amount and
timing is TBD. Competition for NASA Select time is quite steep,
especially during Shuttle missions, and the amount of time Mars
Observer will get is probably pretty small. For example, Mars
Observer begins its mapping operations around the last week in
November/first week in December. Since the Space Telescope
refurbishment mission is scheduled in the same time period, it is
unlikely Observer will get much air time. The commitment for now
(very preliminary) is for a 15 minute weekly summary throughout the
two year mission, with coverage of special events (like joint press
conferences which JPL will plan). HARD CHOICE FOR YOU ALL: do you
want to see 24 hr coverage of shuttle missions or coverage of Mars
Observer? Let NASA Headquarters know.
4) Planetary Data System (PDS) Release: The PDS is a distributed
data archiving system that, working in conjunction with the National
Space Science Data Center (NSSDC) at Goddard Space Flight Center,
provides public and professional access to space mission data. NASA
has written into all Mars Observer contracts the requirement to
prepare appropriate archive data products, and to transfer these
products to the PDS after the proprietary rights period, which is
nominally six months (see separate message re: Proprietary Rights).
With recent budget cuts imposed by Administrator Goldin's demand for
lower Mission Operations and Data Analysis costs (what did he THINK
was going to be cut?), these archived products will be pretty raw, but
thanks to modern computers, also not unreasonably inaccessible to people
with a little know-how. The MOC data are not in image format in their
raw form--we send the data down compressed. Nor is it standard
JPEG--we developed our compression (a varient on DCT) before the
standard was settled upon, and by using a larger transform block (16 X
16) and a set of 16 requantization tables we developed empirically, we
actually get better images for a given Q factor. The intent of the
PDS is to act as a bridge between the original investigators and other
scientists and the public in gaining access to the data. The PDS
nodes (USGS Flagstaff and JPL for Imaging, Washington University for
other Geoscience data) are set up to provide both on-line and personal
help in finding what is needed and getting it into the format that's
desired.
Within a year of the end of the mission, all the data will be "in the
public domain." But unlike most previous missions (Magellan being the
the first of the new breed), data will be released DURING the mission,
so you don't have to wait the entire mission to see the very first data.
|
| 528.201 | MO and the Mars "Face" | VERGA::KLAES | Quo vadimus? | Mon Aug 23 1993 14:12 | 198 |
| From: US1RMC::"baalke@kelvin.Jpl.Nasa.Gov" "Ron Baalke" 22-AUG-1993
To: sci-space-news@uunet.uu.net
CC:
Subj: Observations of the "Face on Mars" by the Mars Observer Camera
This posting is from Mike Malin, Principal Investigator of the Mars
Observer Camera, in response to the net discussions that have been
going on during the past two weeks.
Please do not respond to the e-mail address above. My only link
to the network is through this third party and I don't want them
deluged with replies. I do read the net occassionally and will try to
respond when time and interest permit.
Topic: Observations of the "Face on Mars" and other such "Things" by
the Mars Observer Camera
There have been a lot of questions about whether or not the Mars
Observer Camera (MOC) will observe the "Face on Mars" or other
features in the Cydonia region on Mars. This note will (try) to
describe what we are going to do and why.
BACKGROUND
For those of you not familiar with the topic, several Viking images
show features on the surface of Mars that, in the eyes of some people,
resemble "faces," "pyramids," and other such "artifacts." The most
famous of these is the "Face on Mars" and associated features "The
City," "The Fortress," "The Cliff," "The Tholus," and "The D&M
Pyramid." A fairly substantial "cottage" industry has sprung up
around these features, with several books having been written about
them, newsletters published, public presentations, press conferences,
and, of course, National Enquirer and other "tabloid" published
reports. The basic premise of these people is that the features are
artificial, and are messages to us from alien beings. Their tack is
to say, "These should be rephotographed by Mars Observer, since with
high resolution we should be able to PROVE that these are artificial.
If these are in fact artificial, this would rank as one of the
greatest discoveries in history and thus every effort should be made
to acquire images." Evidence cited as presently "proving" these are
unnatural landforms include measurements of angles and distances that
define "precise" mathematical relationships. One of the most popular
is that "The D&M Pyramid" is located at 40.868 degrees North Latitude,
relative to the control network established by Merton Davies (the RAND
scientist who has been more or less singularly responsible for
establishing the longitude/latitude grids on the planets) to an
accuracy (actually, a precision) of order 0.017 degrees. They point
out that 40.868 equals arctan (e / pi); alternatively, one of the
advocates notes that the ratio of the surface area of a tetrahedron to
its circuscribing sphere is 2.72069 (e = 2.71828), which, if
substituted for e in the above arctan equation gives 40.893 degrees,
which is both within the physical perimeter of the "Pyramid" and
within the above stated precision. Other mathematical relationships
abound. The advocates of this view argue that "no scientific study of
these features has been conducted under NASA auspices" and that NASA
and the conservative science community are conspiring to keep the
"real" story from the American public.
The conventional view is that this is all nonsense. The Cydonia region
lies on the boundary between ancient upland topography and low-lying
plains, with the isolated hills representing remnants of the uplands
that once covered the low-lying area. The features seen in these
mesas and buttes (to bring terrestrial terminology from the desert
southwest to bear on the problem) result from differential weathering
and erosion of layers within the rock materials. The area is of
considerable importance to geologists because it does provide insight
into the sub-surface of Mars, and to its surface processes. The
measurement of angles and distances seems so much numerology,
especially when one understands the actual limitations in the control
network (of order 5-10 km, or 0.1-0.2 degrees) and the imprecision of
our corrections of the images (neglecting, for example, topography
when reprojecting data for maps) on which people are trying to measure
precise angles and distances. Even given accurate data, however, most
science does not depend solely on planimetric measurements, even when
using photographs. There are many other attributes used to examine
features that don't work for these things. No one in the planetary
science community (at least to my knowledge) would waste their time
doing "a scientific study" of the nature advocated by the proponents
of the "Face on Mars is Artifical" perspective.
To provide you with an idea of the magnitude of this issue, consider
that I spend roughly a quarter of my time these days trying to prepare
thoughtful answers to (often abusive) letters from people who analyse
every word in every sentence in every paragraph in every letter I have
written on the subject (they send copies of my letters to each other
and exerpt them in their newsletters). They see innuendo and hidden
meaning everywhere. I also have it on first-hand authority that at
least 2 NASA Headquarters managers spend similar amounts of time
responding to letters sent over from Congressmen whose constituents
write about "The Face" and to which NASA is obligated to respond.
THINGS LIMITING MARS OBSERVER CAMERA OBSERVATIONS
Before I discuss the observations MOC will make of "The Face on Mars,"
some facts about the camera and its ability to look at specific
locations are needed.
0. The MOC is body fixed to the spacecraft. It has no independent
pointing capability. It makes pictures the same way a fax machine
does (i.e., the scene is moved past the single line detector).
1. Cross-track Field of View - The MOC has a very small field of view
(0.44 degrees), which is about 3 km from the 400 km orbital altitude.
It typically takes very small images at very high resolution (lots of
data). Anything wider than 3 km cannot be imaged in its entirety.
2. Along-track Field of View - The MOC's downtrack field of view is
limited by the amount of data that will fit in its buffer (about 10
MB). If one uses the entire buffer (which is not likely to be
completely empty unless its planned to be) and 2:1 realtime predictive
compression, this translates to a downtrack image length of about 15
km. We've designed the camera to be able to average pixels together
to synthesize poorer resolution, which frees up data. Under the best
case buffer availability, an 8X summed image would be 3 km wide (but
only 256 pixels across) by 40960 pixels long which, at 12 m/pxl (8 X
1.5) would be almost 500 km long.
3. Pointing Control Instability - The spacecraft uses IR horizon sensors
for in-orbit pointing control. Owing to variations in the IR flux of
the horizon with latitude, season, surface topography, atmospheric
dust content, cloudiness, and other meteorological and climatological
conditions, the control capability is about 10 mrad (0.6 degrees = 4 km),
which is larger than the MOC field of view.
4. Spacecraft Position Uncertainty - The position of the spacecraft
is determined by radio tracking for 8 hours (roughly 4.5 hours of
actually seeing the spacecraft) a day, and by computing the position
of the Earth, Mars, and the spacecraft in an inertial coordinate
system. It takes a few days to do this, and to use it to determine
where the spacecraft will be a few days later. By that time, gravity
perturbations, atmospheric drag, and autonomous momentum unloadings
will have changed the orbit. Error studies suggest that the
uncertainty seven days after the end of a given orbit can be
represented as a 40 second uncertainty in the time the spacecraft will
be at a specific point in its orbit. This translates (at the orbital
rate of the spacecraft projected on the ground of 3 km/s) to 120 km
downtrack and (because Mars rotates at 0.24 km/s at the equator) 9.6
km crosstrack. At 40 degrees latitude, the crosstrack uncertainty is
7.4 km.
5. Non-inertial Position Uncertainty - The position of the spacecraft
is determined inertially. As noted above, the position of the
longitude/latitude grid is also uncertain to about 5-10 km.
6. Orbit Spacing - If, in spite of the preceding, orbits were equally
spaced, then the average spacing of orbits at the equator for the 687
day mission would be about 2.5 km, which means that each spot on the
equator will fall within the MOC field of view in (possibly) two
images. In fact, the repeat distance is just over 3.1 km, again
assuming equal spacing, and it is more than likely that each spot on
the equator will only be seen once. At 40 degrees latitude, the
spacing is roughly 2.4 km, and any location will be seen, at most,
twice. Given Items 1-5, it is most likely that some places will be
overflown twice, and others not at all, and that our ability to
predict this is very limited.
We are attempting to address some of these issues with, for example,
optical navigation. This could reduce the spacecraft position
uncertainty by perhaps a factor of five or more. We will try to
create a new control grid with higher precision (perhaps as good as 1
km). But we cannot do anything about the orbit spacing or the
pointing control or the width of the MOC field of view. Thus, hitting
anything as small as a specific 3 km piece of the planet is going to
be very difficult.
And what about the fact that Mars has a very dynamic atmosphere? The
one orbit we fly over something of interest, it may be cloudy, or
dusty.
SO, WHAT ARE WE GOING TO DO
Despite providing a number of people involved with the "private" studies
of the "Face of Mars" with exactly the same information I've just
noted, they continue to think I am purposefully avoiding taking the
picture they want. They are very concerned that the MOC is being run
by a company and that I will try to ransom or profit from the
"important" data (as if they are not). And talk of conspiracy is
everywhere. But it isn't the case: if we get a picture of "The
Face," we will most definitely release it.
"The Face on Mars," "The City," "The Fortress," "The Cliff," "The
Tholus," "The D&M Pyramid," etc. are in our target database (now they
want detailed copies of that binary data base!). We will try to get
pictures (its almost impossible not to try to take the pictures, since
the data base and initial targeting effort is fully automatic). Of
course, given the factors noted above, I'd be stupid to tell people we
were definitely, without doubt, and postively without uncertainty
going to get a picture of any of these things. For one thing, they
would then cry that I was hiding the picture if in fact we never got
one. So my approach has been not to promise anything, which of course
gets me in trouble, too.
BOTTOM LINE:
We will try. We more than likely will not succeed. There is no
conspiracy. We are not ignoring the problem (just the people who are
making a real nuisance of themselves).
|
| 528.202 | Engineers remain optimistic (I can't imagine why) | SKYLAB::FISHER | Carp Diem : Fish the Day | Mon Aug 23 1993 14:44 | 23 |
| As Henry Spencer says (aprox. quote): "The fact the com was lost during tank
pressurization leads one to think of an obvious failure mode, and it is
catastrophic." I suppose if it is a computer problem, there is hope (assuming a
backup computer that runs the orbit insertion).
Anyway, here is the UPI article:
PASADENA, California (UPI) -- NASA officials say there is no reason to
think the Mars Observer spacecraft is permanently lost, even though
controllers have picked up no signals from the craft since late
Saturday.
``The flight team remains optimistic about recovery,'' said a
statement from NASA's Jet Propulsion Laboratory, which controls the
distant probe.
Engineers have been sending signals in an effort to override the $400
million craft's on-board computer, which may be responsible for the
communications problem.
While NASA officials said they believed the Mars Observer's automated
controls would fire its rockets Tuesday to propel the probe into orbit
around Mars, scientists would be unable to use any data from the mission
if communication is not restored.
Even worse -- if the spacecraft does not go into orbit on its own, it
could zoom past Mars and never reach its target.
|
| 528.203 | | MAYDAY::ANDRADE | The sentinel (.)(.) | Mon Aug 23 1993 15:29 | 6 |
|
MOI -1 Day
.................................gulp...................................
|
| 528.204 | Mars Observer Update -- 08/22/92 (MOI-2 days?) | PONIL::J_BUTLER | E pur, si muove... | Mon Aug 23 1993 16:24 | 40 |
|
Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
August 22, 1993
8 p.m. Pacific Daylight Time
Engineers are continuing to attempt to reestablish
communication with the Mars Observer spacecraft, after losing
contact with the spacecraft at 6 p.m. Pacific Daylight Time on
Saturday, Aug. 21, three days before the craft's capture in orbit
around Mars.
The spacecraft's on-board sequence to begin preparing for
orbit insertion was uplinked on Friday, Aug. 20. Controllers
have no reason to believe that the spacecraft is not carrying out
those instructions even though communication has been
interrupted. The spacecraft is set to enter orbit around Mars at
approximately 1:30 p.m. PDT on Tuesday, Aug. 24.
The Jet Propulsion Laboratory Public Information Office will
be closed until 8 a.m. PDT on Monday, Aug. 23.
For information on the Mars Observer spacecraft, call the
JPL status phone for missions at (818) 354-2410. Additional
information may be obtained by calling (818) 393-1255.
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.205 | | SKYLAB::FISHER | Carp Diem : Fish the Day | Mon Aug 23 1993 16:44 | 9 |
| I just called the JPL info line mentioned in .-1. Apparently, the transmitter
cut off during the pressurization sequence was *planned*. They tape says it was
cut off for the "pyro firing sequence". However, it never came back on. They
have been sending commands like "Force entry into contingency mode" but to no
avail. They are in the process of uploading a command sequence which will send
direct hardware commands to the backup transmitter to turn on, "bypassing any
possible software faults."
Burns
|
| 528.206 | | SKYLAB::FISHER | Carp Diem : Fish the Day | Mon Aug 23 1993 16:48 | 1 |
| re .196: I remembered wrong: The Ida flyby is Saturday, not Thursday.
|
| 528.207 | Mars Observer Update #2 -- 08/22/93 | PONIL::J_BUTLER | E pur, si muove... | Mon Aug 23 1993 18:06 | 35 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 22, 1993
MOI -2 Days
The Mars Observer flight team has lost communications with the spaceraft
as of Saturday evening during the execution of the bipropellant system
pressurization sequence. This sequence automatically turns the transmitter
off for the pyro firing event, as planned, but the flight team has had
no indication that the transmitter was autonomously re-enabled by the onboard
sequence following the pyro firing. Several commands has been sent to
the spacecraft to attempt to reestablish communications including transmitter
beam on and forced entry to contigency mode which configures the downlink to
the Low Gain Antenna, but these have not yet been successful. A
telecommunications recovery sequence has been generated to reconfigure
the telecom system using hardware commands to override any potential
software faults in the onboard computers. This sequence is currently
being radiated to the spacecraft and will be completed early Monday
morning. The flight team remains optimistic about recovery and efforts
will continue to reestablish a spacecraft downlink. The critical
Mars Orbit Insertion is currently executing out of the stored sequence,
and it is believed this maneuver will complete as planned.
MOI = Mars Orbit Insertion
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.208 | | SKYLAB::FISHER | Carp Diem : Fish the Day | Mon Aug 23 1993 18:15 | 4 |
| To save phone calls, the info on the JPL phone line matched word-for-word the
latest post from Ron Baalke.
Burns
|
| 528.209 | More on the Loss of Comm... | PONIL::J_BUTLER | E pur, si muove... | Mon Aug 23 1993 18:44 | 32 |
|
Article 70091 of sci.space:
In article <9308221534.aa20235@Paris.ics.uci.edu>, kanderso@mabillon.ICS.UCI.EDU (Kenneth Anderson) writes...
>1. Does Mars Observer have a contingency plan? I.E. If it doesn't hear from
> Earth after a certain period of time, does it try to point toward Earth
> and reestablish communications?
Yes, this is called safemode.
>2. Is there any indication that the problem is more serious, i.e. damage
> to the craft?
At this point we don't suspect there is any damage to the spacecraft. The
antenna is either pointed the wrong way or the spacecraft's transmitter
failed to restart after the tank pressurization. There is no indications that
the fuel tanks have ruptured or failed to pressurize. Quoting
Glenn Cunningham, Project Manager for Mars Observer: "I don't think we're
going to lose this mission. I think we've had one of the typical little
hiccups that affect all our missions because these are very complex pieces
of hardware with many computer systems." The commands to perform tomorrow's
critical rocket burn for orbit insertion were uplinked to the spacecraft
last Friday. Despite loss of communications to the spacecraft, it is still
expected to execute the rocket burn.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.210 | Another UPI Report...NASA News Conf at 4PM EDT | PONIL::J_BUTLER | E pur, si muove... | Mon Aug 23 1993 18:50 | 39 |
|
Article 3374 of clari.tw.space:
From: clarinews@clarinet.com (UPI)
Subject: NASA officials hoping Mars mission not 'total loss'
Note: (Editors: NASA news conference at 4 p.m. EDT)
(complete writethru -- faulty antenna may be problem)
PASADENA, Calif. (UPI) -- With time running out before a make-or-break
maneuver, NASA controllers Monday anxiously watched their computer
screens for a radio signal from the Mars Observer spacecraft.
The $450 million Red Planet probe fell silent Saturday during a
planned protective mode, but the transmissions did not resume as
expected. Engineers have been sending commands to the craft since then,
hoping to re-establish communications, but with no luck so far.
``The longer it goes on, it's getting grimmer,'' said NASA spokesman
Alan Wood at the Jet Propulsion Laboratory in Pasadena, Calif.
Without a radio signal, the Mars Observer is unable to send any data
about Mars back to Earth. Officials also are unsure whether the craft
will even reach its Mars orbit. It is scheduled to shift gears to drop
into orbit around Mars Tuesday afternoon.
``If we get no Mars observations, it's a total loss,'' said Wood,
noting that the craft was designed only for observations from an orbit
around Mars and could not relay useful data if it goes somewhere else.
Engineers hope the craft obeys commands sent last week to insert the
probe into orbit around Mars. If it does not, the spacecraft will fly
aimlessly past its target, ending the $1 billion program without any
results.
``If the spacecraft doesn't go into orbit, it just flies by Mars and
there is no mission,'' said another NASA spokesman, Bob MacMillin.
Engineers hoped the problem is that the spacecraft's antenna was
pointing the wrong direction, since that would be easier to correct,
MacMillin said.
``If that's the case, we'll just have to catch up with it after we do
get a radio link,'' said MacMillin.
The Mars Observer was launched from a Titan rocket on Sep. 25, 1992.
If it reaches orbit around Mars, the craft is scheduled to relay signals
from Russian probes scheduled to land on Mars in 1995.
|
| 528.211 | Mars Observer Update -- 08/23/93 (MOI - 1 day?) | TINCUP::J_BUTLER | E pur, si muove... | Mon Aug 23 1993 19:25 | 34 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 23, 1993
10:20 AM PDT
MOI -1 Day
The Flight Team has been working around the clock to reestablish communications
lost with the spacecraft Saturday evening around 6:00 PM. Those efforts have
not been successful up to this point.
Several on/off cyclings of both primary and back up transmitters (RPA) have
been uplinked up to this point. No signal has yet been received.
The Flight Team at JPL, together with Martin Marietta Astro Space Division
engineers at East Windsor, New Jersey continue to investigate possible on-board
failure scenarios and their ramifications. The Verification and Test Laboratory
at JPL is attempting to replicate events which may have caused the current
situation.
This status will be updated throughout the day as information becomes available.
Telephone calls should be directed to JPL Public Information,
Area Code 818/354-5011, attention Diane Aisworth.
MOI = Mars Orbit Insertion
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.212 | Mars Observer Update #2 -- 08/23/93 -- Hope? | TINCUP::J_BUTLER | E pur, si muove... | Mon Aug 23 1993 21:48 | 31 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 23, 1993
12:40 PM PDT
MOI -1 Day
The Flight Team at JPL, together with Martin Marietta Astro Space Division
engineers at East Windsor, New Jersey have identified a promising explanation
for events which may have led to communication loss on Saturday evening.
Those events has already been partially replicated in the Verification and
Test Laboratory spacecraft model at JPL. Complete analysis and responding
commanding strategy are in development. If approved, commands to correct the
problem would be sent this afternoon.
This status will be updated throughout the day as information becomes
available.
Telephone calls should be directed to JPL Public Information,
Area Code 818/354-5011, attention Diane Ainsworth.
MOI = Mars Orbit Insertion
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.213 | More Questions and Answers... | TINCUP::J_BUTLER | E pur, si muove... | Mon Aug 23 1993 22:09 | 26 |
|
From: oreilly@olivia.la.asu.edu (Tom O'Reilly)
Organization: Mars Observer TES Project, ASU, Tempe AZ
prb@access.digex.net (Pat) asks:
> Why does the transmitter have to turn off when the pyro fires?
The transmitter contains a travelling wave guide assembly that is susceptible
to arcing when subjected to mechanical shock.
> And shouldn't the command loss timer go off
> soon and start MO sun-coning or was that inhibited in preparation
> for MOI?
> Theoretically, the MOI command sequence is still running.
> If the S/C is still good, and MOI runs successfully,
> will the CLT activate, and start contingency mode
> after the burn from mars orbit?
The command loss timer (aka "deadman timer") is currently inhibited, but
begins ticking again after MOI. I believe that the timeout period is about
2 days.
Tom O'Reilly
Arizona State University
|
| 528.214 | System Clock Problem? | KALI::M_HUGHES | | Tue Aug 24 1993 01:23 | 8 |
| re .12 There was a short blurb on NPR on the car radio on the way home that
said the problem may be that the system clock is stopped, and therefore the
spacecraft is not accepting commands. The report stated that the problem was
reproduced on the ground test bed and that a sequence was being built to
start the backup clock. The bad news is that the clock kicks off the MOI
sequence. No clock, no MOI. Those guys must be sweating bullets.
Mike Hughes
|
| 528.215 | Mars Observer Update #3 -- 08/23/93:7PM PDT | CXDOCS::J_BUTLER | E pur, si muove... | Tue Aug 24 1993 11:09 | 33 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 23, 1993
7:00 PM PDT
MOI -1 Day
The Flight Team uplinked more commands this afternoon to recover communications
with the spacecraft. Analysis had determined that similar behavior could
have been caused by a possibly stuck spacecraft clock. Commands were sent
which switched to redundant timing mechanism followed by cycling of primary
and backup transmitters. Those efforts have not yet proven successful.
Planning is underway to reset the engineering data formatter and flop from
control to non-control standard control processors. That commanding is
expected to be performed tonight. Revised commands from which to perform
Mars orbit insertion have been built and are ready for uplink at such
time as ground spacecraft communication has been reestablished.
This status will be updated throughout the day and night as information becomes
available.
Telephone calls should be directed to JPL Public Information,
Area Code 818/354-5011, attention Diane Ainsworth.
MOI = Mars Orbit Insertion
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.216 | Mars Observer Update -- 08/23/93:8PM PDT | CXDOCS::J_BUTLER | E pur, si muove... | Tue Aug 24 1993 11:11 | 52 |
|
Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER STATUS
8 p.m. PDT, August 23, 1993
Flight controllers continued to send commands to Mars
Observer Monday afternoon and early evening in an effort to
reestablish communication with the spacecraft.
At 3:39 p.m. Pacific Daylight Time commands were sent to
Mars Observer instructing the spacecraft to switch from its
master clock to a backup unit. Flight controllers then sent
commands to reset the engineering data formatter, a spacecraft
process that formats data sent to the ground, in case a problem
with it was preventing Mars Observer from sending data. In
addition, commands were sent to switch from the spacecraft's main
command computer to a backup; to switch transmitters; to switch
from transmitting on the high-gain antenna to the low-gain
antenna; and a second command to switch the spacecraft's master
clock. As of 8 p.m. PDT, no signal from the spacecraft had been
received.
The flight team was making plans to continue sending
commands through the night to attempt to restart the spacecraft's
transmitter. In the event a signal is heard, a new command block
to carry out Mars Observer's orbit insertion burn was also
developed if it was required to be sent to the spacecraft
Tuesday. In addition, the flight team did not rule out the
possibility that even if no signal is heard, Mars Observer might
automatically execute commands sent last Friday to carry out the
orbital insertion burn on Tuesday.
Updates on Mars Observer status will be available through
the night at the recorded status line, (818) 354-2410.
Journalists may also contact the Mars Observer project at (818)
393-1255 until 7 a.m. PDT Tuesday, or JPL Public Information at
(818) 354-5011 after 7 a.m. PDT Tuesday.
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.217 | From the Recorded Mission Status Line: 08/24/93:0200 | CXDOCS::J_BUTLER | E pur, si muove... | Tue Aug 24 1993 11:35 | 24 |
| I just called the 818-354-2410 number.
The last update was posted at 0200 24 August (PDT).
No change has been observed yet.
New commands to reset the engineering data formatter (EDF) have been
sent.
The stuck clock theory is still being worked.
Another cause might be a potential fault in the RPA which could cause
a pyro firing failure.
Commands are being sent to return the spacecraft to array normal spin
in case the antenna is sun-pointed, rather than earth-pointed.
None of the commands sent will affect the on-going MOI sequence, which
JPL presumes is still operating. Reset commands have been prepared
if communications are re-established before MOI and a reset is needed.
In summary: No Joy...yet.
Regards,
John B.
|
| 528.218 | Great Galactic Ghoul | ECADSR::BIRO | | Tue Aug 24 1993 12:40 | 20 |
| If the problem is with the pressurization of the fule tanks then the
spacecraft can not slow down to be captured by the Martian gravity.
Many other mission to Mars are dependent on this Mars Mission,
including the Russian probe.
Scientists at the JPL often joke about the presence of a Great Galactic
Ghoul preying of spacecraft in the vicinity of Mars. In fact there use
to be a painting of the Ghoul at JPL untill someone made them take it
down.
From what I have heard they are sending the new command up every 20
mins. Someone said the timer was set for 2 days, lets see if they
lost communication with MOS on Sat around 9 pm PDT and the spacecraft
is set to enter orbit around Mars at apx 1:30pm PDT on Tuesday Aug 24
then they should the timer should have expired already. It dont look
good.
jb
|
| 528.219 | The Great Galactic Ghoul... | CXDOCS::J_BUTLER | E pur, si muove... | Tue Aug 24 1993 13:04 | 14 |
| I remember the "Great Galactic Ghoul" stories and reports from the
"early" days. The "Ghoul" was suspected to "prowl" from approximately
Mars' orbit to Jupiter's orbit. I always associated the "Ghoul" with
the asteroid belt, but I recalled the stories when the Soviet Phobos 2
mission ended so abruptly.
I can also recall the concern felt during the Pioneer and Voyager
missions as they crossed the "Ghoul's" "hunting grounds."
Well...perhaps we'll know more in a few hours....
Regards,
John B.
|
| 528.220 | Mars Observer Update -- 08/24/93 (MOI-6 hrs 43 min) | TINCUP::J_BUTLER | E pur, si muove... | Tue Aug 24 1993 15:16 | 32 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 24, 1993
7:00 AM PDT
Efforts continue to ensure that the Mars Observer spacecraft is in the
proper configuration for execution of the braking maneuver that will allow
the Mars gravity field to capture it. The Flight Team has switched emphasis
from attempting to command on the spacecraft's transmitter to reestablish
communications with the ground to ensuring that command sequences stored
on onboard computer memory will execute the braking action at the correct
time, scheduled for this afternoon at 1:43 PM PDT. Efforts are complicated
by the fact that no downlink telemetry has been received since Saturday
evening. All known scenarios are being addressed and the Flight Team,
with very active support from the spacecraft contractor, Martin Marrieta
Astro Space, will continue to work around the clock to recover communications
with the spacecraft.
This status will be updated throughout the day information becomes available.
Telephone calls should be directed to JPL Public Information,
Area Code 818/354-5011, attention Diane Ainsworth.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.221 | | SKYLAB::FISHER | Carp Diem : Fish the Day | Tue Aug 24 1993 15:35 | 4 |
| Anyone know what the pyro firing was? Do they use some sort of pyro to open the
line to pressurize the tank?
Burns
|
| 528.222 | Mars Observer Briefing Scheduled 1:00 PM EDT | TINCUP::J_BUTLER | E pur, si muove... | Tue Aug 24 1993 16:06 | 31 |
|
Paula Cleggett-Haleim
Headquarters, Washington, D.C. August 24, 1993
(Phone: 202/358-0883)
EDITORS NOTE: N93-48
MARS OBSERVER STATUS BRIEFING SET FOR 1 P.M. EDT TODAY
A media briefing is scheduled for 1 p.m. EDT, Tuesday, Aug. 24, from
NASA's Jet Propulsion Laboratory (JPL), Pasadena, Calif., to discuss the
status of the Mars Observer mission and the attempts to regain
communication with the spacecraft. The briefing previously was scheduled
for 7 pm. EDT.
Media representatives can cover the briefing from NASA Headquarters
Newsroom, 300 E St., S.W., Washington, D.C.
The briefing will be carried live on NASA Select television, Satcom F-
2R, Transponder 13, 72 degrees west longitude, frequency 3960.0 MHz,
audio 6.8 MHz. Questions will be taken from NASA centers.
- end -
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.223 | | HELIX::MAIEWSKI | | Tue Aug 24 1993 16:46 | 13 |
| "Ground control to Major Tom,
Your circuit's dead, there's something wrong,
Can you hear us Major Tom?
Can you hear us Major Tom?"
- D. Bowie
Here I am floating in a tin can
High, above Mars
Planet Earth's that dot,
or is it that one? I think not.
- G. Maiewski
|
| 528.224 | | SKYLAB::FISHER | Carp Diem : Fish the Day | Tue Aug 24 1993 17:45 | 15 |
| Aside from the insipid questions most reporters asked, here are a few
interesting tidbits from the news conference:
1) Built into the MOI sequence after the burn is a command to find earth and
start communicating. They will be looking for this at about 4:45PM EDT.
2) If that does not happen, there is a 5-day command loss timer which, based on
the last command they KNOW it received (Friday) will kick off on Wednesday.
3) On possible thing they can do if it missed the MOI burn but then they get
back in contact with it, they still have ~36 hours to order another massive MOI
burn. This would burn all the propellant, but it would get them into about a
45-day orbit.
Burns
|
| 528.225 | We're still space pioneers | VERGA::KLAES | Quo vadimus? | Tue Aug 24 1993 19:02 | 32 |
| Offering a little hope for MO from past U.S. Mars missions:
It should be added that a number of other Mars probes through the
years have had serious technical problems during their missions but
managed to pull through them and complete their work. This includes
MARINER 7 in 1969, which had a battery explode enroute but still
managed to make a good flyby of the planet as intended; and VIKING 2
in 1976, which lost contact with Earth as its lander was heading
towards the surface but regained communications shortly after
touchdown.
MARINER 3 and 8 were lost in 1964 and 1971, respectively, but
these failures did not involve the probes themselves. MARINER 4,
6, 7, and 9 were fantastic successes, as were VIKING 1 and 2.
On the other hand, the Soviets have had some major failures
in their Mars program, though they still managed a number of firsts
at the Red Planet. In 1974, the braking rockets of MARS 4 failed
to fire, causing the probe to flyby the planet instead of orbit as
intended. Days later the MARS 7 lander ended up missing the entire
planet and drifting off into solar orbit with its carrier bus.
Communications were lost enroute with MARS 1, ZOND 2, the landers
of MARS 2, 3, and 6, and PHOBOS 1 and 2.
If the "Martians" wanted to stop us from looking for whatever
strange reasons, they've done a less than perfect job. More likely
people should realize that it still isn't easy to get a machine across
millions of miles of interplanetary space to other worlds in perfect
working order every time.
Larry
|
| 528.226 | UPI Report | TINCUP::J_BUTLER | E pur, si muove... | Tue Aug 24 1993 19:27 | 40 |
|
PASADENA, Calif. (UPI) -- Admitting they are frustrated, NASA
officials said Tuesday they were ``not giving up'' on the silent Mars
Observer spacecraft.
Contingency plans were ready in case the probe comes back to life but
misses its planned maneuver into orbit around Mars at 1:24 p.m., project
leaders told a news conference at NASA's Jet Propulsion Laboratory in
Pasadena, Calif.
But Project Manager Glenn Cunningham said engineers remained
confident that the problem is one of communication and that the $1
billion Mars exploration program would continue.
``We still believe we have an operating orbit insertion sequence''
and that the craft's on-board controls will guide the probe into its
planned orbit around Mars, said Cunningham.
``We're not giving up,'' Cunningham said, less than four hours before
the craft was supposed to lower itself into an orbit that would bring it
within 300 miles of Mars' surface.
The director of NASA's Solar System Exploration Division, William
Piotrowski, also remained confident. ``We are very hopeful and
cautiously optimistic that communication will be restored,'' Piotrowski
said.
Such restoration would occur at about 2:40 p.m. if the craft's built-
in controls move it into orbit according to the plan, said Saterios
Dallas, one of the project leaders. It takes about 19 minutes for a
signal from the spacecraft to reach Earth.
If the radio link is re-established but the craft misses its optimal
orbit insertion point, NASA managers could guide it to a different, less
useful orbit around Mars.
Another option would be to let the probe continue around the sun and
try the entire operation again in eight or nine months.
A decision would have to come within 24 hours, project officials
said.
Controllers at the Jet Propulsion Laboratory have heard nothing from
the Mars Observer since late Saturday, after engineers shut down the
transmitter as a safety measure during pressurization of the fuel tanks.
The transmitter was supposed to come back on but has remained silent.
The Mars Observer was launched from a Titan rocket on Sep. 25, 1992.
If it reaches orbit around Mars, the craft is scheduled to relay signals
from Russian probes scheduled to land on the planet in 1995.
|
| 528.227 | Contingencies... | TINCUP::J_BUTLER | E pur, si muove... | Tue Aug 24 1993 19:40 | 30 |
|
More information on the contingency mentioned by Burns Fisher earlier:
In article <25dlma$2co@usenet.INS.CWRU.Edu>, co053@cleveland.Freenet.Edu (Steve Wainstead) writes...
>Best case senario is, of course, they reestablish contact, but if not
>sometime tomorrow MO will start searching for a signal from Earth (a
>failsafe procedure, coming a little too late). For if it doesn't fire its
>rockets as it should it will (I think) pass Mars or enter a useless orbit
>and it will be too late.
>--
There are contigency plans if Mars Observer misses the orbit insertion and
flies by Mars. One option is that a second MOI can be performed
36 hours after the original MOI which would place the spacecraft in an
orbit with a period of 40 days (the original MOI would have placed it
in a 3 day orbit). The science would be more limited than the original
and more propellant would be used up, but this is better
than nothing. A second option is to wait 1.5 years and wait for
the spacecraft to loop around the Sun and back to Mars and perform an
MOI then. The orbit in this case would be similar to the original MOI.
This all assumes, of course, that we can still talk to the spacecraft.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.228 | In the Finest Tradition of US Radio Journalism... | TINCUP::J_BUTLER | E pur, si muove... | Tue Aug 24 1993 20:10 | 31 |
|
This is unconscionable! I cannot believe a major news network would allow this,
even before we have a clear picture of what is _really_ happening.
-----
From: bjorke@pixar.com (Kevin Bjorke)
Subject: CBS calls MO Loss a Coverup!
A few minutes ago, as I drove to my office, the national CBS Radio News
reported on NASA's continued inability to contact the Mars Observer
Probe. This took about 5 seconds to announce. They then IMMEDIATELY
spent the following minute playing a tape of a "scientist" in Baltimore
(didn't get the name, I was driving a convertible on a freeway bridge)
who was angry that NASA was covering up important data about "certain
structures" (the CBS announcer's term) that had been photographed by
Viking. He then went on to describe in greater detail the cities, libraries,
and alien machines that were on Mars and said "we deserve to know about
these things."
This was the number two story on the national news. Though they didn't
identify the Cydonia environs by name, there are no other "structures" that
I can imagine. Let's not let a possible national (indeed, global) tragedy
be turned into a circus by this irresponsible behavior.
Call CBS NOW and let them know that such wild speculation and accusations
have no place in public policy or in "News" reporting. The main switchboard
number is (212)975-4321. Ask to talk to the radio news department.
kb
|
| 528.229 | | HELIX::MAIEWSKI | | Tue Aug 24 1993 20:22 | 7 |
| Look at it this way. At least the quacks don't still believe that the Earth
is flat.
Credit them with showing a little imagination,
:*)}
George
|
| 528.230 | They've started already... | TINCUP::J_BUTLER | E pur, si muove... | Tue Aug 24 1993 20:32 | 14 |
|
From: sands@netcom.com (Sue and Sean)
Subject: Martian Froot Loops
Even as we type, the west gate of JPL is being picketed by a dozen or
so, bearing signs saying "FACE the facts, NASA" and "NASA: No Alien
Sites Around" (not sure what that one means). I just came back from
lunch to discover them, and almost ran one over from laughing so hard.
--
--
S & S Enterprises: sands@netcom.com Reengage until target is on
Susan: miller_su@swam1.enet.dec.com fire or has changed shape.
Sean: sean@lithos.jpl.nasa.gov
|
| 528.231 | No Joy... | CXDOCS::J_BUTLER | E pur, si muove... | Tue Aug 24 1993 22:56 | 16 |
|
PASADENA, Calif. (UPI) -- NASA's Mars Observer failed to come to life
after computer programs should have guided it into orbit around Mars.
Anxious controllers watched computer screens at the Jet Propulsion
Laboratory in Pasadena, Calif., for a signal to appear at 2:53 p.m. PDT,
about an hour after the craft was expected to drop into its planned
orbit. No radio signal was immediately detected.
NASA managers are hoping to salvage the $1 billion Mars Observer
program.
Earlier, NASA officials said they were ``not giving up'' on the
silent spacecraft and hoped back-up systems would kick its radio
transmissions back on.
Baffled controllers have heard nothing from the Mars Observer since
late Saturday, after the transmitter was shut down routinely as it
approached Mars.
|
| 528.232 | Mars Observer -- MOI Assumptions | CXDOCS::J_BUTLER | E pur, si muove... | Wed Aug 25 1993 04:18 | 37 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 24, 1993
3:30 PM PDT
On the basis that the spacecraft was healthy with the exception of the
capability to transmit its state back to Earth, the Mars Observer Flight
Team staffed for Mars Orbit Insertion for the expected sequence of events.
The onboard insertion sequence would have begun maneuvering to perform
the burn by halting its curise normal 1 revolution/100 minute rotation and
turning to the correct attitude relative to Mars at 12:43 PM PDT. The
nominal burn would of started at 1:24 PM with an expected duration of about
28 minutes and 45 seconds. Engineers at all three DSN (Deep Space Network)
stations and at JPL closely monitored receivers as the post-MOI time for
reacquistion of telemetry approached. The nominal signal acquistion time
passed with no indication of downlink at any of the three stations. The DSN
was requested to continue its search sometime into the evening. Project
management is meeting to determine its future strategy. The absence of
downlink indicating success of MOI does not confirm that MOI did not take
place as expected. The Flight Team is developing commands to be sent to
attempt restoration of communications with the spacecraft.
This status will be updated throughout the day and evening as
information becomes available.
Telephone calls should be directed to JPL Public Information,
Area Code 818/354-5011, attention Diane Ainsworth.
MOI = Mars Orbit Insertion
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.233 | Mars Observer not Mars Synchronous if No MOI | CXDOCS::J_BUTLER | E pur, si muove... | Wed Aug 25 1993 04:20 | 13 |
|
In article <24AUG199319192935@kelvin.jpl.nasa.gov>, baalke@kelvin.jpl.nasa.gov (Ron Baalke) writes:
> There are contigency plans if Mars Observer misses the orbit insertion and
> flies by Mars. ... A second option is to wait 1.5 years and wait for
> the spacecraft to loop around the Sun and back to Mars and perform an
> MOI then. The orbit in this case would be similar to the original MOI.
If the Mars Observer spacecraft did not perform the MOI burn and instead
flys by Mars, it is not in a synchronous orbit with Mars. A large phasing
maneuver would be required to bring the Mars Observer spacecraft back to
the vicinity of Mars at some later date.
|
| 528.234 | | HELIX::MAIEWSKI | | Wed Aug 25 1993 04:30 | 16 |
| RE <<< Note 528.233 by CXDOCS::J_BUTLER "E pur, si muove..." >>>
> If the Mars Observer spacecraft did not perform the MOI burn and instead
>flys by Mars, it is not in a synchronous orbit with Mars. A large phasing
>maneuver would be required to bring the Mars Observer spacecraft back to
>the vicinity of Mars at some later date.
If it was in a holman (sp?) transfer than it would be in an elliptical orbit
with a low point at earth's orbit and a high point at Mars' orbit.
Theoretically it would go pas Mars every now and then.
Of course "now and then" might mean every few Martian orbits or it could
mean every few centuries. I assume that if the author knew what he was
talking about it would mean one Martain year. Was he a reliable source?
George
|
| 528.235 | First the canals, now the Face | VERGA::KLAES | Quo vadimus? | Wed Aug 25 1993 13:30 | 32 |
| All those "Mars Face" advocates ought to read about Percival
Lowell and his adamant belief (almost a century ago now) in a Mars
covered with canals built by an advanced race of beings trying to save
themselves on a dying planet. It eventually turned out that what
he and others thought were canals on Mars were actually optical
illusions brought on by being unable too see natural features more
clearly (Mars never gets closer than 35 million miles to Earth, and
that only happens once every 15 to 17 years).
In the early days of astronomy Mars seemed to be not too unlike
Earth more than any other world in the solar system. Tie in the
ancient desire for organic companionship elsewhere in the Universe
and it becomes difficult to this day for some to let go the idea of
Mars being populated by strange but quite living organisms.
Mars itself is too cold (temperatures on average make Antarctica
look like Earth's tropics), its atmosphere too thin (equivalent to
being 30 miles above Earth's surface), and has hardly any water at
all to sustain even microbes very well, let alone intelligent beings.
At one time in the distant past Mars may have been more Earthlike -
at least long enough to form primitive life - but things took a turn
for the worse soon after, just as with Venus. Future astronauts may
find fossils on the Red Planet, but I have the feeling they will be
the first civilized beings on the planet.
There probably is life beyond Earth, but it will probably be
found in other star systems, not ours. Of course, I could be wrong.
Perhaps both sides of the issue should hold off on declaring victory
until proof is found.
Larry
|
| 528.236 | Mars Observer Update -- 8:30 PM 08/24/93 | CXDOCS::J_BUTLER | E pur, si muove... | Wed Aug 25 1993 13:41 | 33 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 24, 1993
8:30 PM PDT
The Flight Team is in the process of uplinking more commands to
recover communications with the spacecraft this evening. Those commands
are intended to cycle between primary and backup transmitters in different
sequences from those attempted prior to today's planned MOI (Mars Orbit
Insertion).
Expected expiration of the 5 day Command Loss Timer period tomorrow
afternoon will provide information on the ability to command the
spacecraft. If the spacecraft senses that no commmands have been
received from the ground for five days, it is programmed to autonomously
begin activities leading to invocation of fault protection routines and
to enter its defined contigency mode state: sun coning and switching to
Low Gain Antenna operations. Indications of that occurrence should be
received on the ground at about 2:30 PM tomorrow, Wednesday, August 25.
This status will be updated throughout the day and evening as information
becomes available.
Telephone calls should be directed to JPL Public Information,
Area Code 818/354-5011, attention Diane Ainsworth.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.237 | Command Loss Timer Q & A | CXDOCS::J_BUTLER | E pur, si muove... | Wed Aug 25 1993 13:42 | 16 |
|
In article <dieter-250893091142@ariane.informatik.rwth-aachen.de> dieter@informatik.rwth-aachen.de (Dieter Kreuer) writes:
>FIVE DAYS? I would not have expected, that at such a critical point
>of the mission, the Command Loss Timer would be set to such a high
>value...
On the contrary, during such a critical phase, you *want* it set to a
nice high value. If MO lost contact a day or two before orbit insertion --
as in fact it did -- its best bet was to carry on with its already-loaded
insertion program, *not* to fall back on a safemode-recovery sequence
that would render it incapable of maneuvering until JPL reconfigured it.
Carrying out the maneuver on schedule was more important than restoring
communications immediately.
--
"Every time I inspect the mechanism | Henry Spencer @ U of Toronto Zoology
closely, more pieces fall off." | henry@zoo.toronto.edu utzoo!henry
|
| 528.238 | More Questions and Answers | CXDOCS::J_BUTLER | E pur, si muove... | Wed Aug 25 1993 13:45 | 88 |
|
Here are a couple of responses to questions I posted last night...jb
First Response:
In article <1993Aug25.041131.8681@nntpd2.cxo.dec.com>, j_butler@cxdocs.enet.dec.com (J. Butler) writes...
>
>A couple questions:
>
>1. The focus of the action so far has seemed to be on a communications fault.
>Little has been posted about the possibility of a catastrophic failure during
>pressurization. It seems to me that an explosion of the tank would be one of the
>first things considered, as that was the only "unusual" activity happening
>at the time.
>
>Q. Is there any reason to NOT to suspect such a failure?
That has been considered, but the odds of the tank exploding is 1 out of
a 1000. Unless there is data to indicate otherwise, the MO project
considers the spacecraft to be functioning and in orbit around Mars,
but experiencing communications problems.
>2. The Mars Observer spacecraft is relatively small and extremely far away.
>
>Q. Are there any earth-based systems (such as radar) that could detect an
>object the size of Mars Observer if it in fact failed to execute MOI. I would
>think we would have a fairly accurate estimate of position relative to Mars.
Not that I know of.
>By the way, though things don't look good, I'd like to offer my thanks to all
>concerned for not giving up, and for the extremely hard work of the past few
>days.
Let me emphasize that we haven't given up on Mars Observer and we are
more determined than ever to reestablish communications with the
spacecraft.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
*************************************************************************
Second Response:
In article <1993Aug25.041131.8681@nntpd2.cxo.dec.com> j_butler@cxdocs.enet.dec.com (J. Butler) writes:
>1. The focus of the action so far has seemed to be on a communications fault.
>Little has been posted about the possibility of a catastrophic failure during
>pressurization...
As Ron has mentioned, it's considered somewhat unlikely. Unless somebody
goofed somewhere, this is the sort of failure that ought to be precluded
by the design.
More to the immediate point, it's also the sort of failure that they
can't do much about. Right now, the priority is salvaging the mission,
not doing a post-mortem on a failure, so it makes sense to focus effort
and attention on the possibility of a non-fatal failure.
>2. The Mars Observer spacecraft is relatively small and extremely far away.
>Q. Are there any earth-based systems (such as radar) that could detect an
>object the size of Mars Observer if it in fact failed to execute MOI...
Systems like radar, involving active illumination but no cooperation
from the target, are orders of magnitude too short-ranged unless the
target is the size of a planet. Radar return from a small unhelpful
target scales as the inverse *fourth power* of distance, because the
inverse-square law gets you once in each direction. It's difficult to
track an uncooperative spacecraft in Clarke orbit (40000km) with radar;
doing it over planetary distances is out of the question.
Passive systems, relying on reflected sunlight or the spacecraft's own
emissions, aren't quite so impossible. But the spacecraft is very
small for the distance involved -- if we could resolve it, we wouldn't
need to fly the camera on it! The only real hope of detecting it is
arranging for very high contrast somehow, and I believe there was a faint
hope of being able to detect infrared emissions during the insertion
rocket burn, when the hot exhaust plume greatly increases the IR output.
--
"Every time I inspect the mechanism | Henry Spencer @ U of Toronto Zoology
closely, more pieces fall off." | henry@zoo.toronto.edu utzoo!henry
|
| 528.239 | | APACHE::N25480::FRIEDRICHS | APACHE::FRIEDRICHS | Wed Aug 25 1993 13:50 | 5 |
| Could Hubble possibly see MO?? Or is the focal length too far away?
Or is MARS too bright??
just a thought...
|
| 528.240 | OSB | ECADSR::BIRO | | Wed Aug 25 1993 14:04 | 28 |
|
Ok if the lost command counter is set for 5 days
why are then sending commands... wont this just
reset the lost command counter if the receiver is
working...
It would seem to me to make more sense that since
it is now to late to put it into mars orbit, to stop
transmitting for 5 days. Wait and then see if the
transmitter turns back on.
Many years ago AMSAT tried to get a simple Amateur radio
becon on all deep space missions. The idea was simple, to
see how far a amateur radio station could 'see' into deep
space. THe idea I still think is good, somewhat like the
Search & Rescue beacons for Aircraft etc maybe there should
be an independent Oh-Shit Beacon on all deep space missons.
IT would be trigered by external sensors but all its power
and circuits would be independent in its own explosion proof
case. It would come to life and possible you could have more
then one, thus the modulation or frequency that is used could
indicate the source of the problem. Ok NASA wont use the
OSB (oh-shit-beacon) so call it the LSB (lost-in-space-beacon)
but I will know what it was.
jb
|
| 528.241 | IR Signaure | ECADSR::BIRO | | Wed Aug 25 1993 14:23 | 8 |
| A NASA offical did say that the only way of detecting the
Satellite from earth would be by monitor for the space craft
burn using an IR signature. As mention in ..239 maybe the HUBBLE
could be use to look for the IR signaure. DOes anyone know of the
status of the IR sensors on Hubble
jb
|
| 528.242 | Another Response to my Questions... | CXDOCS::J_BUTLER | E pur, si muove... | Wed Aug 25 1993 14:41 | 50 |
|
Response received by mail from Jeff Moersch
(Thanks, Jeff!)
(Also thanks to the several others who sent me mail!)
To:
In article <1993Aug25.041131.8681@nntpd2.cxo.dec.com> j_butler@cxdocs.enet.dec.com (J. Butler) writes:
> A couple questions:
> 1. The focus of the action so far has seemed to be on a communications fault.
> Little has been posted about the possibility of a catastrophic failure during
> pressurization. It seems to me that an explosion of the tank would be one of the
> first things considered, as that was the only "unusual" activity happening
> at the time.
> Q. Is there any reason to NOT to suspect such a failure?
The reason such a failure has not been actively considered up to this
point is that if this is what happened, there is no recovery. Better
to spend the time focusing on "fixable" failure modes, in case the fix
is time-critical. I'm sure people will re-examine the quoted "1 in
1000" chance of tank failure later if we never end up hearing from MO
again.
> 2. The Mars Observer spacecraft is relatively small and extremely far away.
>
> Q. Are there any earth-based systems (such as radar) that could detect an
> object the size of Mars Observer if it in fact failed to execute MOI. I would
> think we would have a fairly accurate estimate of position relative to Mars.
Some folks here at Cornell who are associated with the Arecibo
telescope ran some numbers on this possibility last night, and it
appears that the spacecraft is just too small to be seen at that
distance. However, radar return goes as 1/R**4, so it may be possible
to detect MO (or its remains) when it comes closer to Earth at some
periapsis in the future (assuming MOI was missed).
An attempt was being planned early Tuesday afternoon (EDT) to use the
IRTF in Hawaii to observe MOI at (I believe) 2.3 microns. Having not
heard from them by now, I assume they didn't see anything. Of course,
that doesn't mean the burn didn't take place: the entire disk of Mars
is only about 4" as viewed from Earth right now, so a tiny rocket
plume off the top of the planet's limb would be pretty tough to spot.
Jeff Moersch
MO GRS Team graduate associate
Astronomy and Space Sciences
Cornell University
|
| 528.243 | Why send commands... | PRAGMA::GRIFFIN | Dave Griffin | Wed Aug 25 1993 14:49 | 30 |
| Think about the failure modes (that we can puzzle over):
1. If it can listen, but can't talk (transmitter failure), then sending it
a wide variety of transmitter reconfigurations has a much better chance
of reacquiring control sooner.
2. If it can't listen, but can talk -- it should have done so a number of
times already. Sending it commands has no effect anyway. The command
loss timer is running (assuming the computers are working at all). But
if it can't talk, then it won't matter anyway.
The logic, given the facts so far, is pretty clear-cut: Mars Observer had
a "bad day" late Saturday or Sunday. The press has the impression that
today's "deadline" is really big -- given the actions taken so far, it is
a minor bump. If they don't hear from it in a couple of weeks -- then they
might have to consider it gone.
After reading the previous replies from the PI on the camera, I feel really
bad for the scientists (I feel for the engineers too) -- but the scientists
have to sit back and just watch and wait (and wait, and wait...).
- dave
p.s.
There was a previous query about what pyro activities were taking place.
It appears, from my listening to the news conferences, that the
pressurization valves are pyro-activated (probably a burst membrane between
the He tanks and the regulators -- or something of that ilk).
|
| 528.244 | Re: Hubble | PRAGMA::GRIFFIN | Dave Griffin | Wed Aug 25 1993 14:56 | 13 |
| HST is designed to perform better at the UV side of the spectrum. If it has
IR capabilities, they would be limited to the near IR anyway. [I think WFPC-2
is supposed to improve near-IR sensitivity -- not sure how good WFPC-1 is.]
I haven't kept up on the GHRS -- it had troubles months ago.
Ground-based IR telescopes might have a better chance: they have a much
greater light gathering capability, which might be what you need for a
spectrograph of the burn. Angular resolution (HST's "claim to fame") may
not be of particular value in this case -- besides, it's too late to even
worry about (and I'd REALLY doubt they could point it that fast).
- dave
|
| 528.245 | Information on Pressurization | PONIL::J_BUTLER | E pur, si muove... | Wed Aug 25 1993 15:44 | 37 |
|
In article <25f0t0INN2a3@gap.caltech.edu> carl@SOL1.GPS.CALTECH.EDU writes:
> (I certainly don't). Now suppose what really happened (please note, I'm NOT
> claiming that the following scenario is accurate or even possible; merely
> that to someone with little or no knowledge of the spacecraft hardware, it
> would seem plausible) was:
>
> During pressurization, somehow propellent and oxidizer mixed somewhere
> they weren't supposed to, and were somehow ignited, resulting in an
> explosion that killed the spacecraft.
Actually, if they mixed, they'd ignite immediately, since the
propellants in question (MMH and NTO) are hypergolic.
A perhaps more likely failure mode would be failure of the pressure
regulators. The helium for pressurizing the tanks is stored in a
bottle at pressure considerably higher than the pressure of the
propellant tanks. Regulators step down the pressure. The regulators
are redundant (a series-parallel or parallel-series arrangement?), so
a single failed regulator can be tolerated. If two in series get
stuck open, however, the propellant tank will be overpressurized and
could fail. Considerable energy would be released in this failure,
even if no propellants reacted. The spacecraft at launch was 60%
propellant by mass.
It should be noted that the main propulsion system has already been
used (it performed a 50 m/s course correction shortly after launch).
I wonder how the 1-in-1000 figure for main propulsion system failure
is calculated. I could imagine common-mode failures for the regulators
-- for example, if some grit got accidently left in the helium bottle,
and it jammed two regulators open.
Paul
|
| 528.246 | Mars Observer Update -- 08/25/93 | PONIL::J_BUTLER | E pur, si muove... | Wed Aug 25 1993 15:44 | 37 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 25, 1993
7:55 AM PDT
The Flight Team continued uplinking commands to reconfigure telecommunications
hardware on the spacecraft through the night. Essentially, those commands
cycled between primary and backup transmitters in sequences different from
those attempted prior to Tuesday's planned Mars Orbit Insertion.
Engineers at JPL and at Martin Marietta Astro Space in New Jersey have been in
teleconference for several hours this morning continuing exploration of all
possible scenarios to implement restoration of communications.
Expected expiration of the five day Command Loss Timer (CLT) period this
afternoon will provide information as to the ground's ability to command the
spacecraft. If the spacecraft senses that no commands have been received from
the ground for five days, it is programmed to autonomously begin activities
leading to invocation of fault protection routines, and to enter its defined
Contingency Mode state, sun coning and switching to Low Gain Antenna
operations. Indications of that occurrence should be received on the ground at
about 2:30 PM today (Wednesday, 8/25).
This status will be updated during the day and evening as information becomes
available.
Telephone calls should be directed to JPL Public Information,
Area Code 818/354-5011, attention Diane Ainsworth.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.247 | Why assume internal problems? | TRCOA::TIPPER | $DEF/INSTRUCTOR SANDY "Kenneth A." | Wed Aug 25 1993 16:55 | 7 |
| I, too, hope that it is a recoverable failure, but how come all
notes here speculating on catastrophe assume hardware system failure,
such as explosion? After all, it is near Mars, and there must be many
more undetected tiny asteroids in the vicinity than in our
neighbourhood. Why could the MO not have just been smashed to bits?
Sandy
|
| 528.248 | HST is good, but not that good | VERGA::KLAES | Quo vadimus? | Wed Aug 25 1993 18:54 | 6 |
| A few years back HST imaged Mars. The resolution was down to
31 miles. Much better than most Earth-based telescopes, but no
good for MO.
Larry
|
| 528.249 | Why not an asteroid? | PRAGMA::GRIFFIN | Dave Griffin | Wed Aug 25 1993 19:09 | 24 |
| Statistics.
You are correct -- it could have whacked into (or been whacked by) some
random piece of space stuff (I'm not sure where the assertion about a higher
number of asteroids than around earth comes from, but that's not really
a big factor in this argument anyway).
The chances of it doing that are really small. I'll wager that there's
less significantly junk floating around at the approach distance than there
is in Low Earth Orbit (yet the instances for collisions there are pretty
darn small).
Add to this the fact that it didn't stop working during normal cruise (or
eventually orbital operations). It stopped working performing some major
operations after some of these components have been sitting dormant in
space for 11 months (some were probably exercised for the first time in
flight).
So you've got the VERY low probability of an independent event vs. the
combined probabilities of a number of things that are in the 1:1000 range.
The tendency is to point to the spacecraft itself.
- dave
|
| 528.250 | ? 3 way ack | ECADSR::BIRO | | Wed Aug 25 1993 20:02 | 14 |
| gee Pobos got wacked by a man made object... what are the odds
of that...
THe 5 day lost of command counter... I was wondering why they say it
will run out in a few hours, is this because that a command is only
cosidered one if there is a three way ack. Ie I send it, the satllite
ack that it receive it and the sender has to ack back that it has
recieve the satellite ack before it can considered it a true command.
This makes sense or a space mission where the two way transmission
times are reasonable. (in this case about 19 min each way )
|
| 528.251 | | PRAGMA::GRIFFIN | Dave Griffin | Wed Aug 25 1993 20:22 | 17 |
| > THe 5 day lost of command counter... I was wondering why they say it
> will run out in a few hours, is this because that a command is only
No -- this is why I said that they are making much more of this than it
deserves. If the receiver is working then the command loss timer is
constantly being reset by the transmitter reconfiguration commands. Either
the earth is silent or the receiver is broken for N days before the timer
fires. [I was a little upset at the NASA folks for leaving people to
just figure this out. Based on some of the press questions, I don't think
they have enough background to make the connections themselves... Frankly,
I be worried about some of the press making toast...]
- dave
p.s. I'm basing this on a lot of reading, etc. I don't know the details
of the spacecraft design to be dead certain. I just know that a 3-way
acking arrangement isn't usually part of the command sequence (in the past).
|
| 528.252 | RE 528.250 | VERGA::KLAES | Quo vadimus? | Wed Aug 25 1993 21:27 | 5 |
| I thought it was already shown that PHOBOS 2 did not get hit
by another object in Mars orbit?
Larry
|
| 528.253 | Mars Observer Press Conference -- 3:15 PM PDT | TINCUP::J_BUTLER | E pur, si muove... | Wed Aug 25 1993 21:31 | 33 |
|
Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
EDITORS' ADVISORY August 25, 1993
A Mars Observer News Conference will be held at 3:15 p.m.
Pacific Daylight Time today in the JPL von Karman Auditorium.
Mars Observer Project Manager Glenn Cunningham will discuss
the outcome of the spacecraft's onboard "command lost timer,"
which would have clocked out at approximately 2:15 p.m. PDT today
and instructed the spacecraft to wait for commands from Earth.
Cunningham will acknowledge receipt or lack of receipt of that
signal and explain plans for continuing to uplink command
sequences to prompt the spacecraft to respond.
The news conference will be broadcast on NASA Select TV,
which is carried on Satcom F2R, transponder 13, located at 72
degrees west longitude.
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.254 | | PRAGMA::GRIFFIN | Dave Griffin | Thu Aug 26 1993 13:21 | 29 |
| I saw the press conference -- it's pretty grim.
The project is relinquishing full-time use of the DSN so that Galileo can
use it for the Ida encounter. Each day they hear nothing increases the
certainty that the mission is a failure.
They are still sending various reconfiguration commands, including computer
rebooting. Now that the 36 hour window where another MOI was possible has
past they can be a bit more aggressive in the commands they send.
They will also consider the option of no commmands for 5 days in case the
receiver is working so they will be certain the command loss contingency
mode loop could execute (if it is alive to do so).
Speculation runs high on the cause. Without data, that's about all they
can do. There's are many bits of data being tossed about regarding the
ability of the He tank to have overpressurized the fuel tanks even if the
dual regulators failed, etc...
The did answer one question I had: the 3 TCM's were powered by rocket firings
in "blow-by" ("blow-off"?) mode: residual pressure in the fuel tanks from
launch was used to force the propellants. The MOI burn required the extra
pressure, hence the activation of the valve to the He tank.
On to Cassini!
- dave
|
| 528.255 | Never say never...yet | VERGA::KLAES | Quo vadimus? | Thu Aug 26 1993 13:54 | 70 |
| Article: 1827
From: clarinews@clarinet.com (UPI)
Newsgroups: clari.tw.space,clari.news.gov.agency,clari.local.california
Subject: NASA pulls out all stops to rescue Mars probe
Date: Wed, 25 Aug 93 17:03:04 PDT
PASADENA, Calif. (UPI) -- Gravely listening to the sounds of
silence from space that spell impending doom for the Mars Observer,
NASA managers Wednesday afternoon vowed to pull out all the stops to
salvage the $1 billion project.
Yet another deadline -- of 3 p.m. PDT (2200 gmt) -- came and
went without a peep from the probe ominously quiet since sending its
last message to Earth Saturday.
The automated signal was expected Wednesday afternoon since
the spaceship had been commanded to call home five days after losing
contact.
``We were hoping the command loss timer, one of several
built-in preventive systems, would clock out,'' said Glenn Cunningham,
project manager at NASA's Jet Propulsion Laboratory, as he announced
the latest setback.
``We are not giving up,'' he said. ``We are still working very
hard. We are continuing with increased vigor to aggressively pursue
communication.''
Scientists were scrambling to reconfigure the onboard
communications systems hardware, in essence, trying to ``reboot'' the
central computer, Cunningham told a news conference.
He admitted, however, that ``every day without communication
lessens our probability'' of success and that scientists do not even
know whether the spacecraft still exists.
Because of lack of communication, controllers were unable to
determine if the probe went into its orbit around Mars on Tuesday, as
scheduled, if it just kept going on a track around the Sun or if it
was damaged or even destroyed.
Cunningham declined to speculate about theories the probe blew
up during pressurization of its fuel tanks as it approached the Red
Planet. All communications ceased when the transmitter was shut down
routinely during the pressurization.
Since engineers have been signaling the lost spaceship every
20 minutes, it is possible the craft has received some of the messages.
``Clearly we need to approach the question that some of the
commands may have been received by the spacecraft and the command loss
counter may have been reset each time,'' Cunningham said.
He said his team was operating on the assumption the craft
carried out its program and slowed down so that Mars' gravity grabbed
it, carrying the probe into an orbit that will bring it within 300
miles (480 km) of the Martian surface.
If the $450 million spacecraft still functions, NASA could
order it into a different, less useful orbit around Mars or let it
continue once more around the Sun and into a Martian orbit next year.
The Mars Observer was designed to study -- for the first time
since Soviet exploration in 1988 -- the surface, atmosphere and
magnetic field of Mars.
The craft, launched Sept. 25, 1992, from a Titan rocket, was
to relay signals from Russian space probes scheduled to land on the
planet in 1995.
|
| 528.256 | Mars Observer Update #2 -- 08/25/93 | TINCUP::J_BUTLER | E pur, si muove... | Thu Aug 26 1993 14:51 | 43 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 25, 1993
3:55 PM PDT
Expiration of the five day Command Loss Timer (CLT) period this afternoon was
based on the last command verification received from the spacecraft 120 hours
earlier. No telemetry was received at the expected Earth Receive Time of
2:56:35 PM PDT.
Given that the spacecraft is in orbit about Mars but is unable to communicate
either because the High Gain Antenna is pointed away, or because of a
configuration problem in any of the on-board subsystems, the spacecraft will
wait 24 hours from CLT clock out before autonomously beginning execution of
Contingency Mode procedures, which include sun coning and Low Gain Antenna
orientation so as to sweep past the direction of Earth periodically. This
pushes out the waiting period for CLT-related recovery to about 3:00 PM
tomorrow, Thursday, August 26, again, based on last verified successful
commanding on Friday, August 20.
Concurrent with this activity, the Flight Team is preparing and sending
commands that assume a trajectory which the spacecraft would now have in the
event the MOI (Mars Orbit Insertion) had not been performed, and had instead
flown by Mars. It is felt that commanding options assuming the spacecraft
was not in orbit around Mars have a greater time criticality for ground
reaction than would those which would be sent assuming a successful MOI which
is invisible to the ground due to communications problems.
This status will be updated during the day and evening as information becomes
available.
Telephone calls should be directed to JPL Public Information,
Area Code 818/354-5011.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.257 | with a little help from my friend... | BRSVMS::PIGEON | | Thu Aug 26 1993 15:51 | 14 |
| No probe should be sent in deep space alone.
If MO had a mate, we would know what happened already, and the
mission would continue.
If Galileo had a mate, both probes could be able to perform their
part of the mission, one relaying signals for the other.
And if you get no failure, you can expand the mission. (Like with
Voyagers)
So how much does NASA save by sending only one probe ?
I think there is a design problem somewhere...
|
| 528.258 | Mars Observer Update -- 08/26/93 | PONIL::J_BUTLER | E pur, si muove... | Thu Aug 26 1993 16:04 | 35 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 26, 1993
7:30 AM PDT
Through the night, the Flight Team continued commanding the spacecraft to
complete reconfiguration of on-board telecommunications hardware. There have
been no indications of telemetry to date.
A command which would "cold boot" the on-board command computer is the subject
of discussion between JPL Engineers and Martin Marietta Astro Space engineers
who worked on spacecraft design and construction. The possible "power on reset"
of the primary Standard Control Processor is being very carefully evaluated.
The decision whether or not to proceed with this option will be made later this
morning.
The possibility remains that a signal could be received as fault protection
software aboard the spacecraft initiates a sun-pointed, earth-sweeping routine
looking for input from the ground. That occurrence would be expected late
afternoon, Pacific time
This status will be updated during the day and evening as information becomes
available.
Telephone calls should be directed to JPL Public Information,
Area Code 818/354-5011.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.259 | | PONIL::J_BUTLER | E pur, si muove... | Thu Aug 26 1993 16:15 | 54 |
|
I posted this to alt.sic.planetary on Wednesday afternoon. It was
written Tuesday evening after trying to imagine what the Mars Observer
Project Team was going through.
Apparently, it was rather well received...it was sent to the Flight
Team and posted on their bulletin board. I have received several
e-mail messages of thanks, so I thought I'd share it with you folks.
As you know, I have tried to keep extracting and posting the mission
status updates since even before Mars Observer's launch. While I am
not at all a part of the project team, I still feel the loss.
Hope you enjoy it, too...
Ad Astra,
John B.
"...we are not giving up..."
High above Olympus Mons
A lonesome spacecraft flew
And far away on another world
Stood fast her silent crew.
For none could hear the robot's voice
Though strong commands were sent
To speak again to those at home
Where giant ears were bent.
What had happend, where was the flaw
That undid the splendid craft?
The dreams of men for sights unseen
Are for us a heady draught.
Let not dismay deter us,
Nor allow our dreams to fade!
The quest to know must flourish
And naught is perfect made.
The distant worlds await us!
The robots will explore
The way for men to follow
To create our future lore.
Once high above Olympus Mons
A lonsesome spacecraft flew
And on a distant planet
Endeavored her faithful crew.
|
| 528.260 | NASA Names Head of Investigation Board | PONIL::J_BUTLER | E pur, si muove... | Thu Aug 26 1993 22:05 | 34 |
|
Paula Cleggett-Haleim
Headquarters, Washington, D.C. August 26, 1993
(Phone: 202/358-0883)
RELEASE: 93-153
NASA NAMES HEAD OF MARS OBSERVER INVESTIGATION BOARD
NASA Administrator Daniel S. Goldin today named Dr. Timothy Coffey,
Director of Research at the Naval Research Laboratory, Washington, D.C., to
head the review board to investigate the loss of contact with the Mars Observer
spacecraft.
Membership of the board will be announced in the very near future.
The board will investigate and determine, to the extent possible, the
cause of the loss of communications and recommend corrective actions to
prevent a recurrence in future missions.
Communication with the Mars Observer spacecraft was lost at 6 p.m.
Pacific Daylight Time on Saturday, Aug. 21, three days before the craft's
capture in orbit around Mars. The spacecraft was set to enter orbit around
Mars at approximately 1:30 p.m. PDT on Tuesday, Aug. 24.
- end -
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.261 | Mars Observer Update #2 -- 08/26/93 | CXDOCS::J_BUTLER | E pur, si muove... | Fri Aug 27 1993 14:37 | 114 |
|
Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. (818) 354-5011
MARS OBSERVER MISSION STATUS
August 26, 1993
2:30 p.m. Pacific Daylight Time
Communications with the Mars Observer spacecraft have not yet
been restored, one and a half days past its planned insertion into
orbit around Mars.
Mission controllers at JPL continued through the night and
morning with efforts to re-establish the necessary radio link with
the spacecraft by cycling the various elements of the
communications system.
At 2:37 p.m. Pacific Daylight Time today, the continued
execution of the command loss timer subroutine will try to position
the spacecraft for optimum pointing and will switch antennas to try
to restore communications.
Project officials still do not believe that the propulsion
tanks leaked or exploded at the time of their pressurization. The
pressure in the tanks at launch was 285 pounds per square inch
absolute (psia). As propellants were used during the three
trajectory correction maneuvers, the pressure was reduced to about
167 psia. Pressurizing the tanks would have raised the pressure to
264 psia. Any greater pressure would require a failure of both of
the in-series pressure regulators. The burst pressure specification
of the tanks is 465 psia and actual test data ruptured tanks at 678
psia. Flow restrictions limit the rate at which the pressure can
increase. Analysis indicates that the probability that the
pressure in the tanks would increase to the burst level within the
9 minutes that the radio transmitter was off is less than 0.1%.
Project officials are systematically evaluating the most
probable sources of the cause of the spacecraft's failure to
communicate.
One such source which has been receiving considerable
attention is the potential failure of the spacecraft's central
clock, whose official name is the "redundant crystal oscillator,"
or RXO for short. Proper operation of this device is required for
operation of the spacecraft's central computers, which sequence the
events on the spacecraft.
The first hypothesis for the lack of communications pointed
to the failure of the central computer to turn the transmitter back
on. Failure of the central clock would prevent the central
computer from doing its job. After sending commands to turn on the
transmitter, switching to the backup clock was the next action
taken by mission controllers.
The central clock has been the focus of investigation because
it contains transistors which have failed in other spacecraft
applications using this type of clock.
The launch of the NOAA-I spacecraft was delayed at the end of
June 1993 when it was discovered that its RXO had failed. A
subsequent investigation revealed that the RXO failure was caused
by the failure of a 2N3421 transistor. Two of these transistors
are used in each of the redundant halves of the RXO. Transistors
from the same manufacturing lot as those in the NOAA-I RXO are
installed in the Mars Observer RXO, making the reliability of Mars
Observer's RXO suspect.
The transistors fail when a weld between a gold-plated post
and an aluminum wire breaks.
This potential problem was discovered when Mars Observer was
only 55 days away from Mars after the spacecraft had been in flight
for over nine months. Because of the way that these transistors
are used in the RXO, Mars Observer would be susceptible to losing
its central clock function if one particular transistor in each
half of the RXO failed.
There is no alternative source of the central clock function
in Mars Observer, and should the loss of this function occur, it
would be a non-recoverable situation.
The RXO, on its primary side, was working perfectly
immediately before the pressurization activity. The last time the
backup side of the RXO was tested was in a launch GO/NO-GO test on
launch day, when it was also found to be working perfectly.
Project officials were not, at first, concerned about the
NOAA-I RXO failure because it would take a failure of two of these
transistors to cause the loss of the central clock function. The
spacecraft is not designed to automatically protect itself against
more than a single failure in any piece of hardware.
The restoring of the spacecraft's transmitter and the
spacecraft's failure to act on ground commands could be tied to the
loss of the central clock function. Project officials now surmise
that one explanation for the loss of communications could result
from the failure of the crucial transistor in each half of the RXO,
or its failure to autonomously switch to the backup side. Then
there would be no central timing function. This failure could have
been induced by the shock of the pressurant valves operating during
the propulsion tank pressurization event on Aug. 21, after which
communications were not restored.
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.262 | | DCOPST::TONYSC::SCOLARO | One Way out | Fri Aug 27 1993 14:51 | 3 |
| Perhaps NASA should take a hint from the Rama's.... :)
Tony
|
| 528.263 | Mars Observer Update -- -8/27/93 | TINCUP::J_BUTLER | E pur, si muove... | Fri Aug 27 1993 16:39 | 45 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 27, 1993
7:30 AM PDT
Beginning at about 3:00 PM Thursday, commands were sent to the spacecraft to
power on its transmitter on the basis that additional autonomous fault
protection activities had begun on the spacecraft. Those activities should have
oriented the spacecraft in a sun-pointed attitude, rotating in a manner in
which each of the two wider-angle-of-reception, low data rate antennas would
sweep the Earth's direction approximately every fifty minutes.
Commands were sent repeatedly over a period of five hours to insure the
greatest chance of being received at the spacecraft, and were sent both to the
point in space the spacecraft would have reached had Mars Orbit Insertion not
taken place as planned, and to the position where the spacecraft would be had
the MOI maneuver executed successfully. No carrier or telemetry has been
received as would be the case if this approach was successful.
After careful consideration, the command to "power on reset" the primary
Standard Control Processor was transmitted at 1:07 AM this morning to the fly
by predicted position, and at 4:30 AM to the on-orbit coordinates. The result
of that command would be to trigger Safe Mode. The decision will be made this
morning whether to send a command to power on the spacecraft transmitter or to
let Safe Mode clock out for its approximately 65 hour waiting period.
With that option exercised, the Flight Team will have utilized all presently
understood recovery approaches. We would then have to remain in a listen-only
mode in the event that on-board fault protection remains able to restore
communication with the ground.
This status will be updated during the day and evening as information becomes
available.
Telephone calls should be directed to JPL Public Information,
Area Code 818/354-5011.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.264 | "Purple Plague" ... A Ghost from the Past... | TINCUP::J_BUTLER | E pur, si muove... | Fri Aug 27 1993 19:22 | 73 |
|
In article <26AUG199322081460@kelvin.jpl.nasa.gov> baalke@kelvin.jpl.nasa.gov (Ron Baalke) writes:
ecraft.
>
> The first hypothesis for the lack of communications pointed
>to the failure of the central computer to turn the transmitter back
>on. Failure of the central clock would prevent the central
>computer from doing its job. After sending commands to turn on the
>
>transmitter, switching to the backup clock was the next action
>taken by mission controllers.
>
> The central clock has been the focus of investigation because
>it contains transistors which have failed in other spacecraft
>applications using this type of clock.
>
> The launch of the NOAA-I spacecraft was delayed at the end of
>June 1993 when it was discovered that its RXO had failed. A
>subsequent investigation revealed that the RXO failure was caused
>by the failure of a 2N3421 transistor. Two of these transistors
>are used in each of the redundant halves of the RXO. Transistors
>from the same manufacturing lot as those in the NOAA-I RXO are
>installed in the Mars Observer RXO, making the reliability of Mars
>Observer's RXO suspect.
>
> The transistors fail when a weld between a gold-plated post
>and an aluminum wire breaks.
>
>
LORD ALMIGHTY!!!
The Purple Plague!!!!
I thought that that was diagnosed and cured in the late 60's!!!!!
Doug McDonald
In article <mcdonald.1302.746413398@aries.scs.uiuc.edu>
mcdonald@aries.scs.uiuc.edu (J. D. McDonald) writes:
>In article <26AUG199322081460@kelvin.jpl.nasa.gov>
baalke@kelvin.jpl.nasa.gov (Ron Baalke) writes:
[Stuff deleted]
>> The transistors fail when a weld between a gold-plated post
>>and an aluminum wire breaks.
>>
>>
>
>LORD ALMIGHTY!!!
>
>The Purple Plague!!!!
>
>I thought that that was diagnosed and cured in the late 60's!!!!!
>
>Doug McDonald
>
Unfortunately, given that the half-life of engineers is about 7 years
(they move on or get promoted) the knowledge of purple plague and its
causes has faded into the background. In the drive to reduce costs the
industry has moved wholesale into plastic packaging, the proponents of
which claim that the reliability is "as good, or better than, traditional
hermetic". In most cases this may be true, but they forgot about the
purple plague. Trace contaminants of halogens combined with moisture
infiltration and gold wire on aluminum tracks seems to bring it back. The
effect is now known by a scholarly sounding title (which I forget).
Mike King.
|
| 528.265 | Mark II? | TINCUP::J_BUTLER | E pur, si muove... | Fri Aug 27 1993 20:42 | 76 |
|
First post seen on thinking for a follow-on mission...
Discretion is not _always_ the better part of valor...
jb
-------------------------------------------------------------
From: masticol@scr.siemens.com (Steve Masticola)
Subject: MO Mark II: We _do_ have what it takes!
Organization: Siemens Corporate Research, Princeton (Plainsboro), NJ
A friend of mine who worked on the Mars Observer project, and who
should have this information, has asked me to post this, in the hope
that it gets some people of consequence thinking.
WE CAN BUILD A SECOND COPY, SOON.
---------------------------------
Approximately 60-70% of the components needed to build a second copy
of the Mars Observer are available, as spares, including most of the
instruments. The design is also complete; this would save one of the
most expensive and time-consuming phases in building any spacecraft.
Building a second MO would be far less costly, and could be completed
in far less time, than the first one.
Of course, a careful review of the MO design and assembly would be
necessary to avoid the problem which has incapacitated the first MO.
But the problem is almost certainly solvable, without major redesign.
At least, we should investigate whether it is.
WHY WE SHOULD.
--------------
Should the MO be written off, there are strong reasons why building a
second Mars Observer would be in the national interest.
1. We need a win in space science.
We have had a string of embarrasing failures of exploratory
spacecraft. After Hubble, Galileo, and now MO mark I, it is imperative
to complete a science mission successfully, or risk becoming
demoralized and turned off, as a nation, to space science. As a
nation, we have lost world leadership in too many arenas to count. As
Americans, we should not allow ourselves to develop a "loser's
mentality."
2. We need to gain from our investment.
Hundreds of millions of dollars have already been spent to develop the
MO. The human and material resources are currently in place to try
again. The only way that the large national investment in MO will be a
total loss is if we fail to use them to learn.
3. We need to keep trying.
Failures are to be expected in research, and are only preliminary to a
success. If we wish to do a thing right, we must be prepared to do it
wrong a few times, examine and correct our mistakes along the way, and
work toward eventual success. We _are_ good enough to win.
As Wilbur Wright remarked, learning to fly is like learning to ride a
horse. A pupil can sit on a fence rail and watch him all day, or try
to get on his back, and try again when he falls. The first way is the
less dangerous, but only the second will teach him to ride.
- Steve (masticol@scr.siemens.com.)
-----
"Success. Four flights Thursday morning. All against twenty-one mile
wind. Started from level with engine power alone. Average speed
through the air thirty-one miles. Inform press. Home Christmas."
-- Wilbur and Orville Wright
Telegram to Reverend Milton Wright,
from Kitty Hawk, N.C., Dec. 7, 1903.
|
| 528.266 | Mars Observer Update -- 08/29/93 | CXDOCS::J_BUTLER | E pur, si muove... | Mon Aug 30 1993 11:46 | 29 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 29, 1993
9:00 PM PDT
The 64 hour safemode waiting period, which began with a command to reset
or "cold boot" Standard Control Processor 1, expired at about 8:50 PM PDT this
evening, with no spacecraft transmitter carrier or telemetry received
at the flyby predicted coordinates. The in-orbit position will be scanned
by the DSN (Deep Space Network) antennas after midnight looking for
transmitter carrier. If none is seen, the Flight Team will follow up with
commands to reset the engineering data formatter and power-on the transmitter.
With no acknowledgement from the spacecraft, commands will be sent to
reboot the Standard Control Processor backup and to select it as the primary.
If Standard Control processor 2 remains viable, receipt of the reset
command will invoke safemode and another 64 hour waiting period.
This status will be updated as new information becomes available.
Telephone calls should be directed to JPL Public Information,
Area Code 818/354-5011.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.267 | | SKYLAB::FISHER | Carp Diem : Fish the Day | Mon Aug 30 1993 14:21 | 20 |
| The fact that NASA did not build to MO s/c is not completely stupidity on NASA's
part. It is part of the "system" of congressional micro-management and
compromising. I'm not saying specifically that Congress said "Build just 1",
but I am saying that Congress certainly limits what can be done for a given
science mission. They are constantly pounding on NASA to spend less. This is
the result. Perhaps NASA should have forgone a giant mission like MO so that
they could have more reduncancy with a smaller mission. But for sure, if the
engineers and scientists had just been given a budget figure and had it
guaranteed for the life of the project, they would have been able to make more
sensible compromises (and in the Galileo case spend a lot less $$) than they
were able to in the current situation.
BTW, I'm not convinced that a second MO would let us learn the cause of the 1st
MOs problem. I suppose one might try to photograph MO1's possible locations
with MO2, but they would certainly be 100s of thousands of miles apart. It
would probably be a good idea if the two redundant s/c on a mission could talk
to each other. I don't know if this was possible in previous cases (like Viking
in particular), but it sounds like a good plan.
Burns
|
| 528.268 | MO phone home!
| GAUSS::REITH | Jim 3D::Reith MLO1-2/c37 223-2021 | Mon Aug 30 1993 14:36 | 3 |
| Looks like we're going to have to revisit the relay satellite
situation yet again if MO was supposed to support other missions.
Now where'd we put that Galileo discussion?
|
| 528.269 | | PONIL::J_BUTLER | E pur, si muove... | Mon Aug 30 1993 14:51 | 20 |
| Re: .267
I agree that a 2nd Mars Observer wouldn't necessarily help us
understand what happened to Mars Observer. Even if work (and approval)
started immediately on a 2nd mission, it is not likely that MO would
be found. If MO is in Mars Orbit, is very elliptical. Without positive
control, it is at the mercy of Mars' gravity. If MO did not enter
orbit...welllll...it's a big Solar System out there, and we don't know
if there was any venting, a partial burn, no burn at all....
The JPL folks will be able to come up with a list of most probable
causes, but (unless MO is found) we won't have a definitive cause.
Sure would be nice to let them folks work with a stable budget,
though.
Regards,
John B.
|
| 528.270 | what will happen to the Russian Probe ? | ECADSR::BIRO | | Mon Aug 30 1993 16:31 | 10 |
| I guess I am more interested in what will now happen to the
russian probes? Will they have time or do they already have
a backup relay station?
Nasa lost 3 satellite in one week, two on the same day.
What are the odds of that, is there a common link that
we are all missing...
jb
|
| 528.271 | Mars Observer Update -- 08/30/93 | PONIL::J_BUTLER | E pur, si muove... | Mon Aug 30 1993 19:19 | 40 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 30, 1993
8:00 AM PDT
The first fault protection 65 hour safemode waiting period expired Sunday
evening at about 8:20 PM PDT, with no spacecraft transmitter carrier or
telemetry received on the ground. The Flight Team responded by radiating
commands to power-on and select SCP-1 (Standard Control Processor #1),
followed by commands to reset the engineering data formatter and to power-on
transmitter 1. Those commands were sent to both flyby and on orbit
predicted locations. That activity was completed at 4:07 AM PDT this morning.
After two way light time elapsed, no indications of carrier or telemetry were
seen.
The decision to "cold boot" SCP-2 (Standard Control Processor 2) has not been
finalized and should be made this morning. Caution in evaluating potential
effects on other spacecraft telecommunications subsystem components is being
exercised. With the decision to power-on/reset SCP-2, another 65 hour waiting
period will be observed. If the result of the SCP-2 power-on/reset is the same
as those to date, commands will be sent to switch back to SCP-1 and repeat the
steps to restore telecommunications. The result of that activity will dictate
whether commanding will take place to switch radio crystal oscillator from the
backup to the primary and repeating telecommunications subsystem restoration
commanding.
This status will be updated during the day and evening as new information
becomes available.
Telephone calls should be directed to JPL Public Information,
Area Code 818/354-5011.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.272 | Mars Observer Camera Info from the PI | PONIL::J_BUTLER | E pur, si muove... | Mon Aug 30 1993 19:25 | 96 |
|
There are many errors in what gwh@soda.berkeley.edu (George William
Herbert) stated in his recent message, but here I take exception to two:
1) that the value of the images that might have been returned by the
Mars Observer Camera would be of lower science value in proportion to
previous missions, given the nature of our knowledge of the martian
surface already and that the other instruments would return new,
fundamental data not previously available, and 2) that the camera was
added to Mars Observer to some degree because of the "Face"
controversy. These two views are, at best, ill-informed, and
essentially nonsense.
Let me address the second point first: the selection of the MOC was IN
NO WAY affected by the "Face" garbage. It was at least partly
affected by public relations issues stemming from the good press
Voyager Uranus and Giotto/Vega Halley received, and by the negative
press associated with the Challenger disaster. But it was primarily
selected on the basis of its science value, in which it competed with
many other proposals.
As for the first point, it should be noted that the MOC proposal was
one of the highest ranked science proposals for the mission
(as determined by the peer review effort leading to instrument
selection). Resources on Mars Observer were far too limited to fly
hardware for any but the best possible science value. The University
of Colorado had two instruments they essentially considered "on-board"
(a UVS and a UVP), essentially addressing 1st order atmospheric
questions, that in fact did not make the cut. The MOC proposal must
clearly have demonstrated superior science to have made it to the
point where the Associate Administrator could select it. Interested
readers are referred to the May 25, 1992 issue of the Journal of
Geophysical Research (v. 97, no. E5) for a description of the science
objectives of the experiment (this article is based on the proposal).
Let me just note a few items in passing. First, the science issues to
be addressed by the MOC were much more specific, and in that sense
perhaps less "fundamental," but no less important. By searching for
finer layers in the polar layered deposits, we would have directly
addressed questions of climatic change (finer layers would basically
invalidate all models presently in vogue). By studing the sediments
transported by the channel-forming events, we would have been able to
determine the viscosity, velocity, depth, and duration of fluid flow
(thus setting to rest the controvery of what fluid was involved
in their formation). Images of landforms interpreted to be formed
along shorelines of ancient oceans, or beneath ancient continental ice
sheets, would certainly have allowed those controversies to be
addressed as well.
I quote from my proposal, and from the above listed JGR article:
" Much of what is known about the state and evolution of the
terrestrial planets comes from the study of images. This is
particularly true for Mars. A complete list and discussion of the
direct discoveries or indirect inferences of first-order importance
made on the basis of photographic interpretation would fill a volume of
considerable proportions. Without images, martian craters, volcanos,
channels and valleys, fretted and chaotic terrains, and polar layered
deposits would be unknown, as would martian wind streaks, dune fields,
lee wave clouds, dust plumes, and localized fogs. Nearly one-half of
the Viking Mars Science Highlights (Solar System Exploration
Committee, Planetary Exploration throught the Year 2000, pg. 44, 1983)
refer to imaging results, clearly demonstrating that even after three
previous, imaging-intensive missions, significant discoveries remained
to be made by cameras. Many of these discoveries resulted from the
increase in spatial resolution or temporal coverage afforded by each,
more sophisticated, follow-on mission.
.
.
.
Three additional factors were critical to proposing a camera for the
Mars Observer mission: 1) a dramatic increase in spatial and temporal
resolution is [sic] certain to lead to new discoveries, 2) the need to
provide both a global context, as well as a form of "ground truth" for
remote sensing observations, and 3) the goal to provide observations
directly relevant to future Mars exploration."
I note that the last factor was, at the time, considered a
major negative for my proposal--no one in his/her right mind was
thinking that Mars was going to become a centerpiece of US space policy,
and to saddle Mars Observer with a goal of contributing to future Mars
exploration was considered the height of folly.
Cameras are valuable science instruments. The types of arguments put
forward in the cited message are reminiscent of those I heard during
many Mars Geoscience/Climatology Orbiter Science Working Group
meetings, and which could easily have led to Mars Observer not having
a camera. Fortunately, both a group of scientists with considerably
less at stake (the peer review committee) and high level NASA
management (middle level management didn't want a camera either) knew
better and insured that a camera flew. I know future missions will go
through the same debate, hopefully with the same results.
Mike Malin
Principal Investigator
Mars Observer Camera
|
| 528.273 | On request... | SUBPAC::MAGGARD | Careful with that AXP Eugene! | Tue Aug 31 1993 13:43 | 69 |
| re 528.264
John Butler asked me to post this in here. The article is in response to
the 'Purple Plague Kills Mars Observer?' thread that was started in
alt.sci.planetary...
- jeff
----------------
Newsgroups: alt.sci.planetary
Path: ryn.mro4.dec.com!nm%decwrl::!maggard
From: maggard@nm%decwrl::.enet.dec.com (Jeff Maggard)
Subject: Re: Purple Plage Kills Mars Observer?
Message-ID: <CCKvD4.F8u@ryn.mro4.dec.com>
Lines: 45
Sender: maggard@subpac.enet.dec.com (Jeff Maggard)
Reply-To: maggard@nm%decwrl::.enet.dec.com (Jeff Maggard)
Organization: Digital Equipment Corporation
X-Newsreader: mxrn 6.18-6
References: <1993Aug27.122700.14895@bnr.ca> <25m832$7od@gaia.ucs.orst.edu>
Date: Mon, 30 Aug 1993 15:07:52 GMT
In article <25m832$7od@gaia.ucs.orst.edu>, roseg@UCS.ORST.EDU (Garth Rose)
writes:
>All right, all right, I'll bite: WHAT is the purple plague???!?
When aluminum and gold are placed in contact with each other and heated to
temperatures in the 0C to 500C range, a reaction occurs at the interface
between the Al and Au forming one or more of five 'intermetallic'
compounds:
Au4Al, Au5Al2, Au2Al, AuAl, and AuAl2
The AuAl2 phase is purple in color, the others are tan and white. These
intermetallics are brittle, more electrically resistive, and have different
thermal-expansion coefficients than their source metals. Observations of
failed parts often show the presence of the purple AuAl2 phase at the
failure surface. Hence the name.
In electronic components, interconnections are sometimes made to the device
(typically a silicon IC) with gold wires. If aluminum metal is used on the
device bond pads, then you have an Au/Al couple. You can have a similar
situation if Al wires and Au pads are used.
Any time you put Au and Al together, they'll react to form intermetallics.
The presence of these intermetallics is not necessarily a problem. But
exaggerated growth due to high temperatures, corrision in the presence of
moisture and/or halogens, or thermal excursions, etc. are bad for bonzo.
If left to grow for too long, Kirkendall voids can form at the metal/inter-
metallic interfaces. These voids can be sources of mechanical failure due
to their tendency to initiate and accelerate crack propagation under stress
(e.g. mechanical vibration, thermal cycling, etc.).
There is/was/has been a debate over whether the presence of Silicon in the
intermetallic(s) is the REAL cause of 'purple plague.' Silicon forms a
terenary compound (AuSiAl4 I think) and also accelerates the formation of
the purple AuAl2 phase. This terenary compound is dark in color (dark
purple in one reference, black in another), and forms adjacent to the
AuAl2. Since silicon is commonly used in Al metallization on ICs (to
prevent spiking), and also in Au wires (as a hardener), it is occasionally
believed that the true 'purple plage' is dependent on the presence of
silicon. This was published as early as 1964 (Selikson and Longo), and one
reference I have is dated 1959 (Bernstein), and there are hundreds of other
references.
Jeff Maggard
Digital Equipment Corporation
Hudson, MA
|
| 528.274 | Mars Observer Update #2 -- 08/30/93 | TINCUP::J_BUTLER | E pur, si muove... | Tue Aug 31 1993 14:27 | 29 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
August 30, 1993
4:00 PM PDT
The decision to power-on/reset SCP-2 (Standard Control Processor 2) has been
deferred. Analysis by Flight Team elements indicated greater risk in doing
so that is currently deemed necessary in terms of potential effects on other
spacecraft telecommunication subsystem components. A command conference is
currently taking place to discuss and approve switching redundant radio crystal
oscillator from the backup to the primary and repeating telecommunication
subsystem restoration commanding. That commanding, if approved, would begin
this evening.
This status will be updated during the day and evening as new information
becomes available.
Telephone calls should be directed to JPL Public Information,
Area Code 818/354-5011.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.275 | Av Week Mars Observer Article Summary | TINCUP::J_BUTLER | E pur, si muove... | Tue Aug 31 1993 14:29 | 59 |
|
There is an article on Mars Observer in the August 30, 1993 issue of
Aviation Week. I've summarized some of the important points from the
article below.
o The last known commands known to be received by Mars Observer was on
August 20 when the orbit insertion sequence was uplinked. On August 21
at about 6PM, no signal was received from the spacecraft after the
tanks were pressurized. The spacecraft has not been heard from since.
o Prior to pressurizing the fuel tanks for orbit insertion, the transmitter
was turned off to protect the filament in the transmitter. This is a
common practice for any high-shock event and was recommended by Martin
Marietta. The transmitter has been turned off and on in four previous
occasions for the three trajectory correction maneuvers and deployment of
the High Gain Antenna.
o The odds of the fuel tank exploding is under 0.1% (or under 1 in a 1000).
The pressurization sequence is started by activating the helium via
dual pyro valves to pressurize the tanks to 264 psia. The nitrogen
tetroxide (N2O4) is pressurized first, clearing the helium lines of
the oxidizer. The monomethyl hydrazine tank is then pressurized.
Dual series pressure regulators prevent overpressurization and dual
check valves prevent the hypergolic propellants from mixing through
the pressurization tubing.
o Attempts were made to view to thruster firing of Mars Observer with
two infrared telescopes in Hawaii, but the attempts were thwarted by
cloud cover. The Hubble Space Telescope was also considered, but it was
on the wrong side of the Earth and would have had to point closer to the
Sun than was desired.
o If Mars Observer did not execute its orbit insertion burn on August 24,
it would have flown by Mars but remained in an elliptical orbit
around the Sun between the Earth and Mars. Opportunities to enter
Mars orbit may occur 10 months to 2 years from now, provided the
spacecraft can be recovered.
o Mars Observer may have entered orbit around Mars on its own.
o If Mars Observer was not maintaining proper attitude and the solar
arrays were not pointed at the Sun, the spacecraft would last
about 7 days before running out of electrical power.
o If Mars Observer is lost, then the Russian Mars '94 mission would lose
about half of its science data, since Mars Observer was to act as
a communications relay for the Mars '94 mission. Also, the Mars '96
mission may have to be redesigned.
o If Mars Observer is not recovered, it will be the first post-launch
failure of a NASA planetary spacecraft since Surveyor 7 in 1967,
a period spanning 26 years.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.276 | Correction to Av Week Summary Article | TINCUP::J_BUTLER | E pur, si muove... | Tue Aug 31 1993 15:28 | 36 |
|
>> o If Mars Observer is not recovered, it will be the first post-launch
>> failure of a NASA planetary spacecraft since Surveyor 7 in 1967,
>> a period spanning 26 years. ^^^^^^^^^^
Surveyor 7 was a failure? Somebody must have made a mistake. Surveyor
7 landed just north of the crater Tycho and sent back a jillion photos,
and did both scoop and alpha particle soil analysis. Controllers almost
lost the alpha experiment, but were able to use the scoop to free it
and complete the experiment.
The Surveyor program lost #2 to a faulty vernier motor that started it
tumbling and #4 fell silent minutes before landing.
--
tim harincar
soc1070@vx.cis.umn.edu
In article <31AUG199309135597@vx.cis.umn.edu>, soc1070@vx.cis.umn.edu (Tim Harincar) writes...
>
>>> o If Mars Observer is not recovered, it will be the first post-launch
>>> failure of a NASA planetary spacecraft since Surveyor 7 in 1967,
>>> a period spanning 26 years. ^^^^^^^^^^
>
>Surveyor 7 was a failure? Somebody must have made a mistake.
This is a typo, it should have read "Surveyor 4."
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.277 | | ONE900::HUGHES | Samurai Couch Potato | Tue Aug 31 1993 16:55 | 8 |
| Note that the Russian Mars 94 effort does not require MO to tact as the relay.
However, MO would have been in a much better orbiter (low altitude polar) to
act as a relay than the Russion mars orbiter.
gary
p.s. what was the third spacecraft lost last week (i.e. in addition to MO and
NOAA-13)?
|
| 528.278 | | SKYLAB::FISHER | Carp Diem : Fish the Day | Tue Aug 31 1993 19:05 | 6 |
| Hipparcos. They press release tries to make it sound like it was intentionally
stopped ("was terminated 15 Aug 1993"), but later text makes it clear it was
on its last legs, and in fact, they lost communication with the on-board
computer in June. (See note 559.22)
Burns
|
| 528.279 | | ONE900::HUGHES | Samurai Couch Potato | Tue Aug 31 1993 19:57 | 3 |
| I don't think you can 'blame' NASA for an ESA satellite.
gary
|
| 528.280 | | SKYLAB::FISHER | Carp Diem : Fish the Day | Tue Aug 31 1993 21:05 | 3 |
| True. John? Did I guess wrong?
Burns
|
| 528.281 | The Third "Loss" | TINCUP::J_BUTLER | E pur, si muove... | Tue Aug 31 1993 22:24 | 19 |
|
I do think that Hipparcos was the other mission lost last week.
While it was an ESA mission, NASA supported parts of it through
Goldstone (see note 559.22). ESA and NASA have traditionally shared
data well, so the end of the Hipparcos mission would naturally be felt by
all concerned.
Actually, if you review the life of the Hipparcos mission you will
see a remarkable success!
Still, when a mission ends, there is a sense of loss. Does anyone
else remember the PBS program on the Voyagers? The party after
the Neptune encounter was poignant, to say the least.
There's a heck of a lot of dedication out there...
Regards,
John B
|
| 528.282 | Mars Observer Update #2 -- 08/31/93 | PONIL::J_BUTLER | E pur, si muove... | Wed Sep 01 1993 00:09 | 36 |
|
Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
August 31, 1993
The Mars Observer flight team is meeting today to discuss
the possible ramifications of attempting another command sequence
to switch the "redundant crystal oscillator" -- the "quartz
crystal" of the spacecraft's internal clock, from the backup to
the primary unit. No commanding will occur today. The earliest
time that the team would begin another command sequence would be
late afternoon on Wednesday, Sept. 1.
A decision to try to "cold boot" the spacecraft's backup
computer system was also deferred yesterday. Analysis by flight
team groups indicated greater potential risk to other spacecraft
subsystem elements in doing so than was deemed necessary.
An audio status line on the Mars Observer mission is updated
as new information becomes available. Reporters may call (818)
354-2410 or the JPL Public Information Office at (818) 354-5011.
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | The hardest thing to learn
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | in life is which bridge to
|_____|/ |_|/ |_____|/ | cross and which to burn.
|
| 528.283 | Q & A on the use of TWTs | CXDOCS::J_BUTLER | E pur, si muove... | Wed Sep 01 1993 10:46 | 31 |
|
In article <CCMwFq.8Mw@cbnewsm.cb.att.com> ka1gt@cbnewsm.cb.att.com (robert.m.atkins) writes:
>I assume that MO was using a TWT for its main transmitter power amplifier, as
>do most (all?) earth orbiting satellites and deep space probes. Why is that?
SSPAs (Solid State Power Amplifiers) are actually slowly replacing TWT
designs in new satellites, but only slowly.
>(1) Efficiency
>(2) They've been around a long time and are "space qualified"
These two are the big reasons. TWTs are still more efficient, particularly
at the highest frequencies -- transistors don't work as well at microwave
frequencies as they do lower down. And there is a lot more experience with
TWT designs, especially long-term experience.
>(3) They are more reliable
No, on the whole SSPAs are more reliable. (They are also lighter and a
whole lot more linear.)
>(4) They have a lot less parts to fail (same as (3) really)
Not when you figure in the high-voltage power supply they need.
Good references for this are the Agrawal and Fortescue&Stark books on
satellite design; see the sci.space FAQ for details.
--
"Every time I inspect the mechanism | Henry Spencer @ U of Toronto Zoology
closely, more pieces fall off." | henry@zoo.toronto.edu utzoo!henry
|
| 528.284 | | SKYLAB::FISHER | Carp Diem : Fish the Day | Wed Sep 01 1993 16:49 | 17 |
| Other information based on a question I asked on the net and its responses:
Apparently, the RXO not only does the the s/c timing, but also is the clock that
drives the computer. In other words, the RXO stops, the computer stops. There
is a command decoder between the receiver and the computer which can interpret a
few fairly basic commands like:
Swap RXOs
Reboot the computer
Swap antennas
etc.
That is why a total RXO failure is unrecoverable. BTW, if the s/c is not
appropriately pointed, its battery would only keep it alive for about a week.
Burns
|
| 528.285 | Mars Observer Update -- 09/01/93 | CXDOCS::J_BUTLER | E pur, si muove... | Thu Sep 02 1993 11:13 | 22 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
September 1, 1993
1:00 PM PDT
The Flight Team is in the process of evaluating remaining commanding options.
Those plans should be defined by late this afternoon, with commanding to resume
by tomorrow, 9/2.
This status will be updated during the day and evening as new information
becomes available.
Telephone calls should be directed to JPL Public Information,
Area Code 818/354-5011.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Nobody notices when things
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | go right.
|_____|/ |_|/ |_____|/ |
|
| 528.286 | Mars Observer Update -- 09/02/93 | PONIL::J_BUTLER | E pur, si muove... | Fri Sep 03 1993 13:16 | 24 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
September 2, 1993
1:30 PM PDT
The Spacecraft Team continues to review remaining commanding options this
afternoon with their recommendations being presented to the Mission Manager
in a meeting scheduled for 5 PM PDT. With approval of the proposed commanding
strategy, the commands themselves will be generated and uplinked scheduled
for tomorrow.
This status will be updated as new information becomes available.
Telephone calls should be directed to JPL Public Information,
Area Code 818/354-5011.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Nobody notices when things
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | go right.
|_____|/ |_|/ |_____|/ |
|
| 528.287 | Mars Observer Investigation Board Members | 8817::J_BUTLER | E pur, si muove... | Mon Sep 06 1993 13:23 | 49 |
|
Paula Cleggett-Haleim
Headquarters, Washington, D.C. September 3, 1993
(Phone: 202/358-0883)
RELEASE: 93-159
MARS OBSERVER INVESTIGATION BOARD MEMBERS NAMED
Dr. Timothy Coffey, Chairman of the Mars Observer Investigation Board,
today recommended the remaining board members for approval by NASA
Administrator Daniel S. Goldin.
In accepting the recommendations, Goldin said, "I have full confidence
that the board will do its utmost in providing a thorough and systematic review
to determine the cause for the loss of communications with Mars Observer."
"The members were selected based on their significant experience in the
development, acquisition and operation of space systems," said Dr. Coffey, who
also is the Director of Research at the Naval Research Laboratory (NRL),
Washington, D.C.
The board will investigate and determine, to the extent possible, the
cause of the loss of communications and recommend corrective actions to
prevent a recurrence in future missions.
The board plans to present its findings to the NASA Administrator in late
November. A final report will be released and made public after final
acceptance by the NASA Administrator. The board includes:
% Thomas C. Betterton, Rear Admiral, United States Navy
% Peter G. Wilhelm, Director of Naval Center for Space Technology, NRL
% Dr. Michael D. Griffin, Chief Engineer, NASA
% Dr. Joseph Janni, Chief Scientist, Air Force Phillips Laboratory
% Dr. Kathryn D. Sullivan, Chief Scientist, National Oceanic and
Atmospheric Administration
Communication with the Mars Observer was lost at 6 p.m. PDT on
Saturday, Aug. 21. The spacecraft was set to enter Mars orbit at approximately
1:30 p.m. PDT on Tuesday, Aug. 24.
- end -
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Nobody notices when things
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | go right.
|_____|/ |_|/ |_____|/ |
|
| 528.288 | Mars Observer Update #2 -- 09/02/93 | 8817::J_BUTLER | E pur, si muove... | Mon Sep 06 1993 13:24 | 36 |
|
Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
Sept. 2, 1993
The Mars Observer spacecraft team is continuing to review
remaining command options. When a commanding strategy is
developed, the commands themselves will be generated and uplinked
as scheduled. No commanding was expected to take place today.
Two command approaches were under consideration. One would
switch the "redundant crystal oscillator" -- the "quartz crystal"
of the spacecraft's internal clock -- from the backup to the
primary unit. The other would attempt to bypass the spacecraft's
central clock and "cold boot" the backup computer system,
invoking safe mode and waiting 65 hours for a possible phone home
event.
An audio status line on the Mars Observer mission is updated
as new information becomes available. Journalists may call (818)
354-2410 or the JPL Public Information Office at (818) 354-5011.
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Nobody notices when things
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | go right.
|_____|/ |_|/ |_____|/ |
|
| 528.289 | Mars Observer Update -- 09/03/93 | 8817::J_BUTLER | E pur, si muove... | Mon Sep 06 1993 13:24 | 41 |
|
Forwarded from:
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
Sept. 3, 1993
Because no commands have been sent to the Mars Observer
spacecraft since Aug. 30, the flight team decided today to allow
a "command loss timer" program onboard the spacecraft to clock
out the five days before they send any more commands. That five-
day period will elapse Saturday morning Pacific Daylight Time.
A command conference is scheduled for Tuesday morning, at
which time the team will begin to develop the next series of
commands.
Two command approaches are being developed. The first will
take one spacecraft computer off-line in the event there is
contention between the two computers as to which one is in
control. The second commanding approach would switch the
"redundant crystal oscillator" -- the "quartz crystal" of the
spacecraft's internal clock -- from the backup to the primary
unit.
An audio status line on the Mars Observer mission is updated
as new information becomes available. Journalists may call (818)
354-2410 over the weekend.
#####
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Nobody notices when things
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | go right.
|_____|/ |_|/ |_____|/ |
|
| 528.290 | Mars Observer Update -- 09/04/93 | 8817::J_BUTLER | E pur, si muove... | Mon Sep 06 1993 13:25 | 40 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
September 4, 1993
2:00 PM PDT
With no commanding since last weekend, the five day CLT (Command Loss Timer)
has timed out, and if operational, the spacecraft would have started its
internal sequencing to initiate emergency mode. In this mode, the first step
in autonomously activating contigency mode, the spacecraft should reconfigure
the downlink to 10 bps and the uplink to 7.8 bps. Emergency mode also starts
an internal 24 hour timer to activate contigency mode if commands are not
received within 24 hours.
At the end of this next 24 hour period, the spacecraft would enter the sun
comm power attitude control mode and sun point, and would configure the
telecommunications for receive LGA (Low Gain Antenna) cycling on 100 minute
intervals, and then continue to operate in that mode continuously until
commanded by ground or until some on-board fault would initiate entry to
safemode.
It is expected that the entry to contigency mode from the CLT timeout should
occur at about 9:30 PM PDT this evening for the flyby orbit predicts and at
about 5:30 AM Sunday morning for the capture predicts. No downlink would be
expected from the spacecraft at this time, but the spacecraft could be in a
much more favorable configuration for ground commanding which may resume
during this next week.
This status will be updated as new information becomes available.
Telephone calls should be directed to JPL Public Information,
Area Code 818/354-5011.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Nobody notices when things
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | go right.
|_____|/ |_|/ |_____|/ |
|
| 528.291 | Mars Observer Update -- 09/06/93 | CXDOCS::J_BUTLER | E pur, si muove... | Tue Sep 07 1993 21:04 | 24 |
|
Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
September 6, 1993
9:00 AM PDT
The Flight Team continues evaluating plausible anomaly correction strategies. A
commanding strategy has been developed to address 3 possibilities. These are
presently considered low-risk commands, with limited probability of success.
Commanding is planned for today and tomorrow.
This status will be updated as new information becomes available.
Telephone calls should be directed to JPL Public Information,
Area Code 818/354-5011.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Nobody notices when things
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | go right.
|_____|/ |_|/ |_____|/ |
|
| 528.292 | | PAMSRC::ALF::BARRETT | Robot Roll Call | Tue Sep 07 1993 21:25 | 4 |
| >This status will be updated as new information becomes available.
That will probably be when our next Mars probe spots whatever is left of
this one.
|
| 528.293 | point taken but... | AUSSIE::GARSON | nouveau pauvre | Wed Sep 08 1993 02:39 | 6 |
| re .-1
My feeling is that MOI didn't take place in which case MO would orbit the
Sun between approx. 1 AU and however far Mars is from the Sun and thus
would not specifically be detected either from Earth or Mars although
one presumes eventually making a close approach.
|
| 528.294 | MOM & Phobos II info | ECADSR::BIRO | | Wed Sep 08 1993 11:09 | 115 |
|
=========
SpaceNews
=========
MONDAY AUGUST 30, 1993
SpaceNews originates at KD2BD in Wall Township, New Jersey, USA. It is
published every week and is made available for unlimited distribution.
* MARS OBSERVER NEWS *
======================
NASA lost radio contact with its Mars Observer spacecraft on Saturday
August 21, 1993, just days before it was expected to enter into a circular
orbit 400 km above the surface of the planet. Orbit insertion was supposed
to have occured on Tuesday August 24th at about 1:30 PM Pacific Daylight
Time. The spacecraft was expected to begin global surface mapping of Mars
on December 16th that would have lasted an entire Martian year of 687 Earth
days.
Various attempts were made to re-establish contact with the spacecraft, but
so far the Mars Observer has remained silent. NASA engineers believe a
transistor in the satellite's clock failed, rendering the Mars Observer
"brain-dead" and radio silent. It seems improbable that the spacecraft
automatically entered into orbit around Mars, and probably missed its
destination completely.
The Mars Observer was launched on September 25, 1992 on a Titan III rocket
from Cape Canveral Air Force Station, Florida. On July 26, 1993 at 8:52 PM
PDT, the Mars Observer returned its first image of Mars when it was 5.8
million kilometers from the red planet. That image was taken using the
spacecraft's high resolution, narrow angle telescopic camera.
In 1976 an unmanned NASA Viking spacecraft sucessfully photographed the
surface of Mars from an altitude of approximately 1700 kilometers. The
objective of the Viking mission was to search for evidence of intelligent
life on Mars, either now or in the past. Image 35A72 taken by Viking-1 and
received by the Jet Propulsion Lab showed a mile-long, 1500 foot high
humanoid "face" staring into eternity on the surface of Mars. It was later
dismissed without investigation by NASA as a "trick of light and shadow"
and filed away. Frame 70A13 taken over the same area with a higher sun-angle
showed the same feature in addition to a pyramid-like structure approximately
16 kilometers southwest of the "face".
In 1980, Vicent DiPietro and Gregory Molenaar, imaging engineers under
contract to NASA's Goddard Space Flight Center on another project, stumbled
across these Viking images. After further investigation they discovered
folds and horizontal stripes on the "headpiece" or "helmet" of the face
which resembled those of Egyptian Pharaohs, symmetrical cheekbones, an eye
socket, eyeball, and pupil, nose, mouth, and teeth. The facial proportions
were found to be similar to those of early man. DiPietro and Molenaar
published their findings and conclusions in 1980 and were stonewalled by
the planetary science community for doing so.
In a feature article in "Soviet Life" magazine published in 1984, the
Russians revealed their own fascination with the Martian "sphinx" and
five-sided pyramids found in the Viking photos.
In an effort to carry out their own investigations, the former USSR launched
Phobos I and Phobos II, two unmanned satellites to the planet Mars on July
12, 1988. The reason for launching two craft was for redundancy in case one
malfunctioned. Phobos I was lost after it received a bad command during its
journey to Mars and fell silent when controllers tried to re-acquire it on
the way. Phobos II arrived in January 1989 and entered an orbit around Mars
as the first phase towards its real destination, a small Martian moon called
Phobos. The mission was flawless until the craft aligned itself with Phobos.
On March 28, 1989, an elliptical object was detected to be moving towards the
satellite seconds before it failed. All indications were that the elliptical
object had collided with the satellite which was now dead and left spinning
out of control.
On March 28, 1989 Tass, the official Soviet news agency stated: "Phobos II
failed to communicate with Earth as scheduled after completing an operation
yesterday around the Martian moon Phobos. Scientists at mission control have
been unable to establish stable radio contact."
The next day a top official of the Soviet Space Agency (Glavkosmos) stated:
"Phobos II is 99% lost for good." It is important to note that he stated
the entire satellite was gone and not that just radio contact was lost with
it.
On March 30, 1989 at 4:41 PM EST, the Associated Press released the
following statement: "Soviet research centers are now trying to interpret
so far 'unexplained optical phonomena' on the pictures of the Martian
surface. The pictures show an inigmatic strip 23-25 miles wide and a
large spindle-shaped formation."
On March 31, 1989 headlines dispatched by the Moscow correspondents of
the European News Agency (EFE) stated: "Phobos 2 Captured Strange Photos
of Mars Before Losing Contact With It's Base. Vremya revealed yesterday
that the space probe Phobos II, which was orbiting above Mars when Soviet
scientists lost contact with it on Monday, had photographed an unidentified
object on the Martian surface seconds before losing contact." Scientists
described the unidentified object as a thin ellipse 20 kilometers in length.
It was further stated that the photos could not be an illusion because they
were captured by 2 different color cameras as well as cameras taking
infrared shots.
One controller at the Kaliningrad control center concluded that the
Phobos II probe was left spinning out of control, a result of being struck
or shot. In the October 19, 1989 issue of Nature Magazine, Soviet scientists
concluded that the craft could be spinning because it was impacted.
Not since the NASA Viking missions in 1976 has there been a successful
unmanned mission to Mars. NASA's Mars Observer is simply the latest in a
series of spacecraft destined for Mars that failed unexpectedly just prior
to reaching the planet.
The mystery continues.
|
| 528.295 | | LHOTSE::DAHL | Customers do not buy architectures | Wed Sep 08 1993 13:19 | 22 |
| RE: Note 528.294
> =========
> SpaceNews
> =========
>The
>objective of the Viking mission was to search for evidence of intelligent
>life on Mars, either now or in the past.
Not exactly. Detection of life *of any kind* was a prime objective of the
mission. I don't think there was much serious interest/expectation of
detecting intelligent life.
>Phobos II arrived in January 1989 and entered an orbit around Mars
>as the first phase towards its real destination, a small Martian moon called
>Phobos. The mission was flawless until the craft aligned itself with Phobos.
>On March 28, 1989, an elliptical object was detected to be moving towards the
>satellite seconds before it failed.
Really? Anyone know anything about detection of an object?
-- Tom
|
| 528.296 | RE 528.294 | VERGA::KLAES | Quo vadimus? | Wed Sep 08 1993 13:30 | 26 |
| VIKING was supposed to look for *intelligent* life on Mars? I
am under the impression that it was supposed to look for life of the
primarily microscopic kind, judging by the small biology experiments
placed on board the two landers. I also know that the landers' cameras
were designed for finding any nearby plant life or detecting any move-
ment from possible mobile creatures, but intelligent life - I don't
think so. If there is documentation to the contrary on this (and I
don't mean anything from Hoagland and his bunch), I will be glad to
accept it.
As for the PHOBOS probes, I have also read that it was a software/
computer error that ended both probe missions prematurely. Keep in
mind that the Soviets rarely ever blamed their own hardware as being
at fault; it was always an "outside" (meteoroid, solar flare, etc.)
influence that ruined their space vehicles, not glorious Soviet
techonology. This excuse may be found back to their first "official"
Mars probe, MARS 1, in 1963 when it stopped communicating with Earth
months before it was supposed to reach the Red Planet.
Mars is a very intriguing world (as if any part of the solar system
isn't), but I see no reason to "mystify" it in the process. Many Mars
probes have failed, but many others have gone on to reveal this world
as it truly is.
Larry
|
| 528.297 | .294 is interesting, but I wish they had been more balanced... | SKYLAB::FISHER | Carp Diem : Fish the Day | Wed Sep 08 1993 13:34 | 55 |
| This stuff is interesting, but I am always suspicious when notices of
extraordinary happenings are worded this way.
For example, Space News implies that the Russians/Soviets sent Phobos I and II
specifically to investigate the "face", and they leave the impression that the
Russians anticipated that this mission was likely to be intefered with, and thus
sent two probes. (I know, it does not say this explicitly, but the way the
sentences are juxtaposed...).
>The next day a top official of the Soviet Space Agency (Glavkosmos) stated:
>"Phobos II is 99% lost for good." It is important to note that he stated
>the entire satellite was gone and not that just radio contact was lost with
>it.
Eh? Is this supposed to leave the impression that Glavkosmos "knew" more than
they were telling? I'm sorry, I don't like this kind of journalism. Either
tell facts, speculate explicitly, or document someone else's speculations (with
attribution). It makes me suspicious of the other things that are reported as
fact.
Also, note the following contradiction regarding the loss of PhII (from note
439.56):
=========================================
From SCIENCE Vol 245, 8 September 1989 p1045
On 27 March ... the [PHOBOS 2] spacecraft was passing near Phobos
for what was, by then a routine session of imaging. "It was on
automatic operation" he [Kremnev, Director of the Soviet Spacecraft
Manufacturing Plant] said. "To conserve energy, the transmitter was
off during imaging. But at the time it was due to restart, no signal
was heard on Earth." the control group hurriedly sent up emergency
commands," Kremnev said, and they indeed were able to reestablish
contact. "They got 17 minutes of telemetry data. But the spacecraft
was tumbling so that the only communication was through the
spacecraft's small antenna. Therefore they couldn't decipher the
telemetry. Then they lost the telemetry". Phobos 2 was never heard
from again.
But since then, said Kremnev, "Considerable time has been taken,
and we have been successful in deciphering the telemetry." There is
now no doubt that the failure lay in the spacecraft's on board
computer, he said, and was not due to, say, a meteoroid collision.
======================================================
I don't take the above as the Word of Truth either, necessarily, but
I think it is fair to say that the official Russion view of what happend
to PhII is not in line with what is reported in Space News.
BTW, I did not realize that the face was in an orbiter photo...I thought it was
from a lander photo, and thus much smaller.
Burns
|
| 528.298 | Sometimes you have to laugh or go insane | VERGA::KLAES | Quo vadimus? | Wed Sep 08 1993 18:30 | 67 |
| Article: 42773
Newsgroups: sci.astro,sci.space
From: trimm@netcom.com (Trimm Industries)
Subject: Re: Looking for David Letterman's Top List from 6-Sep-1993
Organization: Netcom Online Communications Services (408-241-9760 login: guest)
Date: Tue, 7 Sep 1993 19:07:02 GMT
In article <1993Sep7.174435.13372@nntpd2.cxo.dec.com>
m_frazier@csc32.enet.dec.com (Mike Frazier, TP Support) writes:
>Anyone happen to have David Letterman's Top Ten List from last night's
>(9/6/93) show? The list was the top ten excuses NASA is giving for the
>Mars Observer. Please post them here as I'm sure others would like to see
>this too.
Top Ten NASA Excuses for the Mars Observer
10. "Mars Probe? What Mars Probe?"
9. "Oh damn! Forgot to use The Club!"
8. Those lying weasels at Radio Shack!
7. Too much Tang.
6. Made by G.E.
5. Them Martians musta shot it with a ray gun.
4. Heh Heh Heh - Our space probe sucks - Heh Heh Heh
3. At least we didn't blow our money on some guy running around using
a cellular phone. (??)
2. Remember Watergate? Nixon's up to his old tricks again.
[ drum roll ....]
1. Space Monkeys.
--
Gary M. Watson
Trimm Industries Internet: trimm@netcom.com
North Hollywood, CA 91605 Compuserve 72242,3437
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Article: 42805
Newsgroups: sci.astro,sci.space
From: bgarwood@sngldsh.cv.nrao.edu (Bob Garwood)
Subject: Re: Looking for David Letterman's Top List from 6-Sep-1993
Sender: news@nrao.edu
Organization: nrao
Date: Wed, 8 Sep 1993 00:12:57 GMT
"TI" == Trimm Industries <trimm@netcom.com> writes:
[most of the top 10 List from the 9/6/93 Late Show deleted (Top Ten
NASA Excuses for the Mars Observer]
TI> 3. At least we didn't blow our money on some guy running around using
TI> a cellular phone. (??)
On Friday's show (9/4/93) and again on Monday's show, they showed
several bits of video with Dave making obnoxious use of his new car
phone. Mostly annoying the hell out of a local radio station's traffic
update phone line. "Hi. No, nothing bad to report, the traffic seems
to be moving just fine. Um, some guy just made a U-turn. etc, etc"
or following one of those trucks with a "How am I doing? call 1-800
..." signs on it and he actually called the number "He's driving fine
now. How long should I follow him?" Some bits were better than others
but mostly I felt sorry for the folks at the radio station (WINS).
Just thought I'll respond to the "??"s.
Cheers, Bob Garwood
|
| 528.299 | MO Status--Sept 8, 1993 | SKYLAB::FISHER | Carp Diem : Fish the Day | Thu Sep 09 1993 14:17 | 24 |
| Forwarded from the Mars Observer Project
MARS OBSERVER STATUS REPORT
September 8, 1993
1:30 PM PDT
Commands attempting to reestablish spacecraft downlink are being sent this
afternoon with commanding in this series expected to continue through
Friday. The telecommunications subsystem configuration is being manipulated
in an order which tests plausible hardware and/or software failure
possibilities. None of the commands invoke entry into the fault protection
mode which requires a waiting period on the ground to determine the commanding
effectiveness. Positive results will be seen within 2.5 hours of radiation.
This status will be updated as new information becomes available.
Telephone calls should be directed to JPL Public Information,
Area Code 818/354-5011.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Nobody notices when things
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | go right.
|_____|/ |_|/ |_____|/ |
|
| 528.300 | | GAUSS::REITH | Jim 3D::Reith MLO1-2/c37 223-2021 | Thu Sep 09 1993 14:44 | 4 |
| >>Positive results will be seen within 2.5 hours of radiation.
^^^^
Rather optimistic, wouldn't you say? 8^)
|
| 528.301 | Questioning the sources | VERGA::KLAES | Quo vadimus? | Thu Sep 09 1993 14:58 | 16 |
| Another thing which bothers me about the Space News report on MO
(Note 528.294) - besides the fact it lists *no* info sources - is that
about one year ago it also published a report from Hoagland on his
belief that the U.S. Government secretly sent another Mars probe
ahead of MO - launched from a military Space Shuttle mission no less -
to get the goods on the Mars Face, etc. in case there was something
that could not be revealed to the general public.
Besides taking a *large* block of salt with this report, if it
ever were true, I'd hope they'd have the decency to release its data
now that MO has gone silent. But of course it's probably just a load
of verbage and a further insult to the people who worked so hard to
try and make MO work.
Larry
|
| 528.302 | | SKYLAB::FISHER | Carp Diem : Fish the Day | Thu Sep 09 1993 15:09 | 2 |
| I think one can read that as "if there are positive results, they will be
seen...", but I certainly agree.
|
| 528.303 | Interesting, But... | TFH::ANGELOTTI | | Fri Sep 10 1993 14:57 | 15 |
|
Some very interesting stuff from .294 on, about the Mars Face, Pyramids,
etc. But I sure agree about the misleading inferences & conclusions in
the Space News, about the Russian Phobos probe.
So I hope we don't get off on some sensational tangent here, beyond a
passing mention of some of these stranger possibilities. Let's try to
stick to facts about MO, the topic here. Detailed conjecture, discus-
sion, or debate about NASA coverups, strange Martian formations, or
intelligent beings thwarting our Mars probes are better off in other
topics. The UFOs Conference has such topics & discussions, and it
could sure use this kind of info, for quite awhile now it's been
almost as dead as the Mars Observer.
- Tom
|
| 528.304 | Further Face discussion in note 865.* | KALI::M_HUGHES | | Sat Sep 11 1993 00:31 | 9 |
| There is further discusion of the "Face, Pyramid etc. in note 865.*. Please
continue there if more stuff comes in and reserve this note specifically for
reports on the Mars Observer probe.
Thanks,
Your humble moderator,
Mike Hughes
|
| 528.305 | MO stats | VERGA::KLAES | Quo vadimus? | Wed Sep 15 1993 19:33 | 129 |
| Article: 70600
From: sfinn@astro.ge.com (Shaun M. Finn)
Newsgroups: sci.space
Subject: MO: Some facts
Date: 26 Aug 1993 15:08:48 GMT
Organization: Martin Marietta Astro Space
I put this together to clear up some of the inaccuracies I have
observed in threads through out this news group relating to Mars
Observer's configuration and capabilities. Let me just start by saying
that I am by far no expert when it comes to MO. What follows was
extracted from an info sheet that I'm told was handed out on the day
of the launch here at Astro(I was on the NASA causeway at the Cape
watching the launch in person). I have read postings on the design of
MO being based on the NOAA design. The instrumentation may have been
*loosely* fashioned after the weather observation type spacecraft but,
as you'll read here in a moment the actual MO spacecraft structure was
a modified Satcom K, which is a communication satellite.
Now the facts...
MARS OBSERVER Specifications
Customer: NASA/JPL
Type: Planetary Observer
Mission: Mars Observer
Launch Site: Kennedy Space Center
Launch Vehicle: Titan III/TOS
Launch Date: Sept. 25, 1992
Total Weight(Dry): 1018 kg.
Size: 2.9m x 3.3m x 3.0m (Launch Configuration)
Design Life: 5 Years
Orbit: Mars Polar, Nearly Circular
Altitude: 378 km (Nominal)
Inclination: +92.8 degrees
Nodal Crossing Time: 2:00 PM Sun Synchronous
Key Features: 7 Science Instruments(Two mounted on 6m booms), relay,bipropulsion
and monopropulsion systems,highly stabilized 3-axis control system,
semi-autonomous(Storage Capacity: 2000 Cmds)
Reliability: Redundancy used to avoid single-point failures
COMMUNICATIONS
Command System: NASA DSN-Compatible
Uplink: 500bps, Max
Downlink: 85.3 kbps, Max
Transponders: X-Band uplink & downlink
Antennas: 1.5m High Gain Parabolic Articulating(On a 6m boom) plus 3 Low Gain
RF Power: 44watts
Control: Antenna selected by command
Digital Tape Recorders: Modified NASA standards, 1.38 x 10E9 bit capacity
PROPULSION
Bipropellant System: Monomethyl Hydrazine and Nitrogen Tetroxide
Monopropellant System: Hydrazine
Thrusters: 4 - 490 N (Velocity Change)
4 - 22 N (Velocity Change)
8 - 8.5 N (Orbit Trim)
4 - 0.9 N (Momentum Uploading & Steering)
Total Propellant: 1400kg
STRUCTURE and THERMAL
Type: Satcom K Derivative
Size: 1.5m x 2.1m x 1.5m (Primary & Secondary)
Payload Mounting Area: Nadir Panel plus Side Panels
Thermal Control: Passive with Multilayer Insulation Augmented by Electrical
Heaters (100-300 Watts)
ATTITUDE and ARTICULATION CONTROL
Key Mission Elements: Celestial, Horizon and Sun Sensors, Inertial
Measurement Unit
Design Implementation: 3-Axis Stabilized
Primary & Secondary System Pointing Accuracy in mrad: Control: 10.0,
Knowledge: 3.0
Primary & Secondary References: Horizon & Celestial Sensors
Control: Reaction Wheels, 0.9 & 4.5N Thrusters for Wheel Uploading &
Orbit Maint.
POWER
System: Direct Energy Transfer to All Spacecraft Loads
Solar Array: 6 - 1.83m x 2.2m Panels
Array Pointing Control: 2-Axis Gimbal Drive
Solar Array Capability: 1130 Watts
Batteries: 2 - 42 Amp-Hr NiCd
Electronics: Bus Voltage Regulation, Battery Charging & Discharging, Solar Array
Output Control, Fuse-protected and Fully Redundant
INSTRUMENTS and RELAY
Gamma Ray Spectrometer(Boom-mounted): Surface Elemental Composition
Laser Altimeter: Topographical Study
Line-Scan Camera: Study of climate, surface geology, and surface & atmospheric
interactions
Magnetometer & Electron Reflecometer(Boom-mounted): Global Study of Intrinsic
Magnetic Field
Pressure Modulated Infared Radiometer: Atmospheric Temperature, Water
Vapor, Dust and Pressure Profiles
Thermal Emission Spectrometer: Map Mineral Content of Rocks, Frosts & Clouds
Radio Science(Ultrastable Oscillator): Study of Gravitational Field, Atmosphere
Refractive Indices & Temperature Profiles
Mars Balloon Relay: Data Relay for Mars '94 Balloon Experiment, High Resolution
Pictures, Surface & Boundary Layer Characteristics
Total Science Payload Weight: 166kg
-----------------------------------------------------------------------------
Just as a final note of optimism, those close to the project will
remember that the TOS failed to relay telemetry during its' burn after
launch and there was approx. 40 minutes of apprehension until
Australia tracking picked up MO on course and on schedule. The data
was being recorded by MO so they were able to download it at a later
date for replay.
Also I would like to add my own pat on the back to Ron Baalke for his
constant stream of information...
-Shaun
+--------------------------------------------------------------------------+
| Shaun M. Finn
| Martin Marietta Astro Space
| sfinn@astro.ge.com
| (609)490-3080 Fax#(609)490-4639
+--------------------------------------------------------------------------+
|
| 528.306 | MO Status Sept 15, 1993 | SKYLAB::FISHER | Carp Diem : Fish the Day | Thu Sep 16 1993 13:44 | 32 |
|
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
This came from "newsdesk@jplpost.jpl.nasa.gov". Maybe Ron found a more official
channel to get the news out? Unfortunately, it seems not to be coming so fast
as it used to, either for MO (understandable, given its status) or for Galileo.
Burns
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
September 15, 1993
Commands sent to the Mars Observer spacecraft last week did
not result in detection of a telecommunications subsystem carrier
signal on the ground.
The flight team was sending a command series this week to
attempt to switch the "redundant crystal oscillator" (RXO) from
the backup to the primary unit, accompanied by a command to power
on the spacecraft transmitter.
These commands were to be followed by commands to attempt to
power on the spacecraft's backup standard control processor and
other onboard components. The commanding series was expected to
be completed by Friday, Sept. 17.
#####
|
| 528.307 | Science that MO did accomplish in space | VERGA::KLAES | Quo vadimus? | Fri Sep 17 1993 17:16 | 35 |
| From: US3RMC::"mc@msss.com" "Mike Caplinger" 16-SEP-1993 20:04:29.28
To: verga::klaes
CC:
Subj: What Did Mars Observer Accomplish in Space?
> I would like to know what interplanetary science the probe *did*
> accomplish enroute to Mars? Hopefully this may prove to some that MO
> was not a total loss.
The magnetometer got some data in the Earth's geotail. The Gamma-Ray
Spectrometer got some gamma-ray burster data (I think -- they also
missed several bursts seen by other spacecraft.) The radio science
people contributed to a three-spacecraft search for gravity waves.
There were some successful Ka-band communications experiments. The
MOC got two low-resolution images of Mars from 6 million km out.
This is peanuts, of course, and I think you could argue pretty
successfully that the mission was a complete science failure.
> We have lost probes before, only to succeed grandly with the next
> missions. MARINERs 8 and 9 in 1971 are prime examples of this.
Mariner 8 went into the Atlantic. Mariner 9 was launched shortly
thereafter as part of a planned dual spacecraft mission. I don't see
how that's relevant to the MO mission, unless we get to fly MO II.
Mike Caplinger, MSSS/Caltech Mars Observer Camera Project
mc@msss.com
% ====== Internet headers and postmarks (see DECWRL::GATEWAY.DOC) ======
% Date: Thu, 16 Sep 93 16:58:19 PDT
% From: mc@msss.com (Mike Caplinger)
% To: verga::klaes
% Subject: What Did Mars Observer Accomplish in Space?
|
| 528.308 | What next | MAYDAY::ANDRADE | The sentinel (.)(.) | Mon Sep 20 1993 14:04 | 10 |
| The Mars Observer is gone, Gallileo's main antena is lost.
This just goes too show that we still have a lot to learn about
spacecraft design.
Hope that the powers that be, don't take it as a sign from heaven
that spacecraft exploration should be stoped ....................
NASA is already having enough funding problems as it is ?!?!?!?!?
Gil
|
| 528.309 | Senate Report on MO (and EOS) | VERGA::KLAES | Quo vadimus? | Tue Sep 21 1993 13:59 | 129 |
| From: US3RMC::"JONATHAN.FINK@ASU.Edu" "Jon Fink" 20-SEP-1993 20:57:11.30
To: distribution:;@us3rmc.bb.dec.com (see end of body)
CC:
Subj: fyi#122_distr
Senate Appropriations Report on NASA - EOS, Mars Observer
FYI No. 122, September 17, 1993
On September 9, the full Senate Appropriations Committee sent to
the floor its version of H.R. 2491, the VA, HUD, Independent
Agencies Appropriations Bill for fiscal year 1994. A floor vote is
expected either September 20 or 21. The bill is accompanied by a
208-page report specifying the Senate Appropriations Committee's
recommendations; selected portions pertaining to NASA are
highlighted in this FYI.
MISSION TO PLANET EARTH
"The Committee makes the following changes to the budget request:
+$10,000,000 for program reserves for the Earth observing system
data information system [EOSDIS].
-$28,000,000, including a rescission of 1993 funds of $10,000,000,
from the consortium for international Earth science information
network.
-$20,000,000 from funds for science data purchases in Earth
science. No plan exists that has been presented that suggests how
these funds would be allocated...
-$3,100,000 for research operations support, taken subject to the
normal reprogramming guidelines."
"Earth observing system -- The Committee expects the Agency to
continue to abide by the principles outlined for this program in
Senate Report 102-356. ...The Committee wishes to restate its
desire to retain firm cost caps not only on all EOS spacecraft
development costs, but EOS instruments as well. ...Now that all EOS
instruments for the first series of platforms are under contract,
the Committee directs the Agency to set a cap for each instrument,
by year and as a whole for development, to be submitted in the
operating plan..."
"EOSDIS -- The Committee has included a total of $192,700,000 for
the EOSDIS program, $10,000,000 above the budget request....The
Committee has added [the] $10,00,000 to be used as reserves by the
program office only for activities related to the development of
the EOSDIS core system.
"The Committee remains concerned that members of the Earth science
and environmental communities expect EOSDIS to be all things to all
people. For example, a higher number of standard data products are
now baselined than was originally envisioned by the EOS
investigator working group. Frankly, the Committee wishes to
restate what it said about EOS last year: NASA cannot be expected
to have EOS be the sole locus of the U.S. global change program.
It is not designed to answer every question ever asked about
climate change, nor should anyone insist that it assume added roles
in the U.S. global change program, like extensive analysis of the
human dimension of climate change...
"The Committee wishes to note that it has substantially cut the
out-year costs of the EOS program, at great difficulty to the
program's managers, including the removal of instruments related to
the middle and upper stratosphere and solid Earth geophysics. A
program that was previously scheduled to get $18,000,000,000 from
fiscal year 1991-2000 is now scheduled to receive a total of
$8,000,000,000. Yet despite this reduction of 55 percent, certain
other Federal agencies expect EOS to pick up even more of the costs
of the program rather than less..."
"Earth probes -- The full budget request of $97,300,000 is included..."
MARS OBSERVER
"The recent, apparent loss of the Mars Observer mission is a serious
blow to NASA's credibility with the Congress, and more importantly,
the American people. It is also a serious, though not irreparable,
setback for our Nation's planetary science community. The development
of Mars Observer was marked by many of the fundamental problems for
which NASA has been criticized in recent years: seeking to perform
large missions at the expense of a more balanced program;
overpromising the capability of technology; and substantially
understating cost requirements. Mars Observer's development,
according to the Agency's last project status report on the mission,
grew from $300,000,000 to $511,000,000, a growth of more than 70
percent. In fact, the mission overran its annual budget submission
for fiscal years 1991 and 1992 by more than one-third in order to meet
its September 1992 launch date.
"The Committee will await making its final evaluation about what
lasting effect this mission failure should have on NASA or space
science until after various review boards that have been established
complete their work...
"While critics of the space program will justifiably challenge NASA
for how and why the Mars Observer mission has ended as it apparently
has, the Committee wishes to restate a subtle, but often overlooked
fact in space missions and space-related technology. There has been,
and will always be, an inherent degree of risk in the exploration of
space, and no one should be lulled into believing that it is anything
less than a dangerous and often uncertain business.
"The Committee notes, however, that the failure of the Mars Observer
only increases the pressure upon NASA to successfully repair and
service the Hubble Space Telescope (HST) later this year. Should this
mission fail to live up to the promise that Hubble's capabilities will
be fully restored as a result of this undertaking, NASA's entire
flight program will suffer a substantive and financial setback that
will take many years from which to recover."
"Mars Observer recovery -- Approximately $43,300,000 is contained
for costs previously associated with mission operations and data
analysis, and research and analysis, with the now lost mission,
Mars Observer. The Committee is fencing these funds until the
Agency submits a recovery plan connected with this mission. The
Committee notes that a series of flight spares exist that could be
assembled and then flown, with launch either aboard the shuttle or
even a Russian proton launch vehicle.... Noting that time is of the
essence, particularly if any recovery mission is to be coordinated
with the Russian Mars 1994 mission, the Committee expects a decision
by the administration on this matter no later than October 1, 1993."
###############
Public Information Division
American Institute of Physics
Contact: Audrey T. Leath
(202) 332-9662
##END##########
|
| 528.310 | Mars Observer Update -- 09/22/93 | TINCUP::J_BUTLER | E pur, si muove... | Thu Sep 23 1993 13:37 | 29 |
|
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
September 22, 1993
The Mars Observer flight team sent commands at 7:20 p.m.
Pacific Daylight Time on Tuesday, Sept. 21, to attempt to
activate the spacecraft's Balloon Relay Experiment
omnidirectional beacon. The beacon is part of an additional
spacecraft radio system supplied by the French Centre National
d'Etudes Spatiales (CNES) that would have relayed science data
from Russian instrument packages landed on the Martian surface
during a Russian mission expected to be launched in 1994.
The Jodrell Bank radio astronomy facility in England will
begin searching for the beacon at two predicted locations in
space at about 3:30 a.m. PDT on Thursday, Sept. 23. If the beacon
were to be detected, the information would tell flight
controllers where the spacecraft is and confirm that the
spacecraft is still operating. The radio astronomy search will
continue for several days.
#####
|
| 528.311 | RE 528.307 | VERGA::KLAES | Quo vadimus? | Thu Sep 23 1993 16:56 | 25 |
| Article: 43550
Newsgroups: sci.astro,sci.space,sci.misc,alt.sci.planetary
From: collins@netcom.com (Steve Collins)
Subject: Re: What Did Mars Observer Accomplish in Space?
Organization: Netcom Online Communications Services (408-241-9760 login: guest)
Date: Wed, 22 Sep 1993 05:22:22 GMT
There were extensive magnatometer studies during cruise, including
some of the geotail. MO also participated in the solar system wide
gravity wave experiment, demonstrated downlink of telemetery from deep
space using Ka band, flew one of the most sophisticated space computers
to date, and studied the interplanetary gamma ray environment.
Bear in mind that the choice was deliberatly made to do very little
science in cruise to reduce the size of the operations team and reduce
operations cost.
While it is certainly true that we did not get the science return from
Mars observer, the money was not sent to Mars. A few tons of metal
were. The engineering lessons and experience from building the
spacecraft and instruments will, likewise remain on Earth to benefit
future missions if we choose to undertake them.
Steve Collins
|
| 528.312 | What? You thought there was no beacon on MO? | SKYLAB::FISHER | Carp Diem : Fish the Day | Thu Sep 23 1993 21:09 | 13 |
| In response to a question I posed to the net:
The MBR beacon informs the balloons or surface stations that MO is
passing within range and to start transmitting. Different frequencies
can be sent and each balloon/station responds to only one.
I don't know why they waited so long; my guess is that this is a real
long shot. And yes, I guess the MBR is connected through the Command
Detector Unit, which is (supposed to be?) independent of the central
clock and computer system.
Mike Caplinger, MSSS/Caltech Mars Observer Camera Project
mc@msss.com
|
| 528.313 | Mars Observer Update -- 09/27/93 | PONIL::J_BUTLER | E pur, si muove... | Tue Sep 28 1993 13:41 | 41 |
|
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
MARS OBSERVER MISSION STATUS
September 27, 1993
Attempts to activate an independent radio system onboard the
Mars Observer spacecraft and search for the weak, one-watt signal
have been unsuccessful, but telecommunications engineers at the
Deep Space Network tracking facility in Goldstone, Calif., are
continuing the search this week.
The Jodrell Bank radio astronomy facility in England
participated in a six-hour search for the Mars Observer signal on
Thursday, Sept. 23, because the facility's antennas are capable
of picking up a signal so weak that it can be masked by
background noise from space.
NASA is continuing that search this week, on Sept. 27
through 29, using a 70-meter antenna that has been reconfigured
to detect the low-wattage beacon. The search occurs daily
between 10 a.m. and 5 p.m. Pacific Daylight Time.
The Mars Observer Balloon Relay transmitter is an
independent radio system supplied by the French Centre National
d'Etudes Spatiales (CNES). The system was specifically designed
to gather data as the Observer passed close to Russian instrument
packages landed on the Martian surface during a 1995 mission, and
relay that data to a Russian orbiter overhead.
If the beacon were to be detected, it could not be used in
place of the spacecraft's high-gain or low-gain antennas to
restore commanding of Mars Observer. Attempts to turn the beacon
on were done only to locate the spacecraft in space and verify
that it is still operating.
#####
|
| 528.314 | | CXDOCS::J_BUTLER | E pur, si muove... | Wed Oct 06 1993 15:20 | 29 |
|
This was posted on the net in response to several posts postulating the ability
to use certain radars to detect Mars Observer the "next time around" (assuming
that it did not enter Mars orbit).
Also, apparently the Mars Observer teams are being broken up and reassigned
(hopefully NOT laid off).
jb
-----
From: collins@netcom.com (Steve Collins)
Subject: Re: Another MO rumor
Date: Wed, 6 Oct 1993 02:44:00 GMT
Because of the gravity assist from the Mars flyby, MO's perihelion was
raised to a point almost halfway to the orbit of Mars. This makes even
the closest Earth flybys rather far away.
My info is based on a Figure that the NAV team produced during the study
of the 9 month return option. I am sure that more detailed work has been
done since I saw the fig during that first long week after LOS.
I have heard rumors of an attempt to look for MO using the Hubble
faint object camera. Without computing the magnitudes myself, this seems
more likely than an active radar approach...
Steve Collins (former MO Spacecraft Team Member)
|
| 528.315 | Possible MO orbits | VERGA::KLAES | Quo vadimus? | Mon Oct 11 1993 13:26 | 81 |
| From: US1RMC::"Admin@ccmail.jpl.nasa.gov" "MAIL-11 Daemon" 8-OCT-1993
To: sci-space-news@ames.arc.nasa.gov
CC:
Subj: Revised Mars Observer orbital elements
MARS OBSERVER orbital elements 1 Mar 1993
rev 6 Oct 93
The following are orbital elements for the Mars Observer
spacecraft. Element sets are given for (1) the interplanetary
cruise from Earth to Mars; (2) for its its initial capture orbit
at Mars and (3) its final mapping orbit at Mars if the mission had
been successful; and (4) for its orbit around the Sun if the
spacecraft did not enter Mars orbit but instead flew by the planet.
These orbital elements are predicts generated by the Mars
Observer Navigation Team. The actual set of orbital elements
achieved by the spacecraft will deviate somewhat.
_________________________________________________________________
INTERPLANETARY CRUISE
Semi-major axis 197163351.177 km
Eccentricity 0.23885397 deg
Inclination 1.294 deg
Argument of periapsis -173.656 deg
Ascending node -177.619 deg
Mean anomaly of epoch 110.042 deg
Epoch of elements: March 18, 1993 18:53:38.38 Ephemeris Time
Coordinate system: Sun-centered, Earth Mean Orbit and Equinox
of Epoch J2000
_________________________________________________________________
MARS CAPTURE ORBIT
Semi-major axis 42923.941 km
Eccentricity 0.907977 deg
Inclination 89.000 deg
Argument of periapsis 112.990 deg
Ascending node -106.453 deg
Mean anomaly of epoch -180.000 deg
Epoch of elements: August 26, 1993 10:10:52.78 Ephemeris Time
Coordinate system: Mars-centered, Mars Mean Equator and IAU
Vector of Epoch
_________________________________________________________________
MARS MAPPING ORBIT
Semi-major axis 3766.159 km
Eccentricity 0.004049 deg
Inclination 92.869 deg
Argument of periapsis -90.0 deg
Ascending node 261.590 deg
Mean anomaly of epoch 0.000 deg
Epoch of elements: December 6, 1993 00:00:00.00 Ephemeris Time
Coordinate system: Mars-centered, Mars Mean Equator and IAU
Vector of Epoch
_________________________________________________________________
MARS FLYBY (i.e. spacecraft in solar orbit)
Semi-major axis 204968597. km
Eccentricity 0.174563502 deg
Period 585.789 days
True anomaly -161.326456 deg
Mean anomaly -154.029206 deg
Inclination 6.670063 deg
Longitude of ascending node 35.511309 deg
Argument of perihelion -20.363033 deg
Epoch = September 1, 1993, 19:00:00.0 UTC, spacecraft event time
Coordinate system: Heliocentric, inertial, Earth mean orbit and
equinox of J2000
|
| 528.316 | | BLOFLY::RABAHY | dtn 730-6661 | Mon Oct 11 1993 23:16 | 4 |
| Ok, I've got this silly question; No one knows where the MO is. Is it like
a quantum particle? Until we find it somewhere specifically its'
whereabouts remain a quantum probability wave function. The wave function
will collapse when we find it.
|
| 528.317 | It's Out There Somewhere... | CXDOCS::J_BUTLER | E pur, si muove... | Tue Oct 12 1993 12:41 | 42 |
|
Newsgroups: sci.space
From: wa2ise@netcom.com (Robert Casey)
Subject: Mars Observer ? on its control of its rocket thruster
Date: Tue, 12 Oct 1993 06:21:54 GMT
Have a question about Mars Observer. If the CPU clock generator did in
fact fail, that would mean that it would get stuck midstream in some control
program probably. If the rocket thruster burn caused the CPU clock to fail
(mechanical shock), would the rocket thruster get stuck "on"? As the CPU
isn't counting out clock cycles to time the burn to then turn it off?
Or is there a seperate timer to control this? If the thruster did get
stuck on untill it runs out of fuel, would it end up in Mars orbit, hit
Mars (not real likely), or an altered solar orbit? Might make a difference
where to aim the ground based antenna dishes to try to reestablish contact.
From: prb@access.digex.net (Pat)
Newsgroups: sci.space
Date: 12 Oct 1993 09:06:21 -0400
Organization: Express Access Online Communications, Greenbelt, MD USA
The best assumption is the CPU Clock generator (The RXO)
failed when some pyro valves were fired in preparation for
the Insertion orbit engine firing 48 hours or so later.
The general assumption is thus that MO never fired it's thrusters
and is now in a Solar orbit cycling between Mars and Earth.
I am sure as opportunity permits, searches in visible light will be
conducted for the MO.
there is also some chance that the Fuel system failed and dumped
fuel all over the s/c. this sort of impulse though should be
nominal.
without knowledge of spacecraft attitude during an engine firing,
MO could be ina whole lot of different trajectories.
-----------------------------------------------------------------------------
The greatest mistake you can make in life is to be continually
fearing that you will make one -- Elbert Hubbard.
|
| 528.318 | | AUSSIE::GARSON | Hotel Garson: No Vacancies | Wed Oct 13 1993 01:27 | 14 |
| re .316
>Ok, I've got this silly question; No one knows where the MO is. Is it like
>a quantum particle?
I think you'll find that MO is too big for quantum effects to be
significant in locating it but cf. Schrodinger's cat. I believe a
number of stories have been written involving imaginary universes
where quantum effects were readily observable in the macro world.
>Until we find it somewhere specifically its whereabouts remain a quantum
>probability wave function.
The uncertainty in its position is a function of human fallibility.
|
| 528.319 | No MO Refly in '94 | SKYLAB::FISHER | Carp Diem : Fish the Day | Wed Oct 13 1993 15:51 | 89 |
| Article 25352 of sci.space:
Path:
jac.nuo.dec.com!crl.dec.com!crl.dec.com!decwrl!ames!elroy.jpl.nasa.gov!scn2!tjt
From: tjt@scn1.jpl.nasa.gov (Tim Thompson)
Newsgroups: sci.astro,sci.space
Subject: Mars Observer Report
Date: 12 Oct 1993 21:09:27 GMT
Organization: Jet Propulsion Laboratory
Lines: 72
Distribution: world
Message-ID: <29f6e7$lq7@elroy.jpl.nasa.gov>
Reply-To: tjt@scn1.jpl.nasa.gov
NNTP-Posting-Host: 128.149.9.2
Xref: jac.nuo.dec.com sci.astro:17685 sci.space:25352
I attended a brief presentation at noon today by
Dr. Charles Elachi
JPL, ALD Office of Space Science & Instruments.
Chairman, Mars Recovery Study Team
The Mars Recovery Study Team was tasked with determining
whether or not it was feasible to attempt to recover the
Mars Observer science objectives during 1994, and, if so,
how to implement that goal. They were constrained by NASA
director Goldin to produce low cost, low risk, multiple
probe options.
The study team decided that it was not feasible to
attempt a Mars mission in 1994 because of:
(1) Money. Congress specifically allocated $10 million
to "re-fly" Mars Observer, or to recover its
science objectives (wording unclear). Include
$10 million in allowed carry-over from previous
FY, total $20 million is not enough money.
(2) Time. Most options required building spacecraft
from scratch for launch in 1994 window (about
1 year from now).
(3) Risk. Quick rebuild of MO from spares feasible,
but we don't know why the first one failed. What
if we launch an MO clone and it fails? Results
could be economically/politically disastrous.
MISTI spacecraft designed for Earth orbit, too
risky to send to Mars. Clementine spacecraft
not suitable to task implies big effort, small
return.
The committee recommended no Mars mission in 1994, NASA
concurs.
What about the Russian Mars 94 & 96 missions? Were they
not designed to use MO as a relay? Answer is no.
The Russian Mars missions were originally designed
without MO. The Russian orbiters are in an orbit such that
they appear over the horizon to the landers only during
short periods for the early part of the mission. This was
understood in the original design. When it appeared that
MO would be in a better orbit, then MO was offered as a
relay for landers. Now that MO is no more, then the
Russian Mars missions return to original mission design.
The committee is now working on ways to recover Mars
Observer science objectives with later missions. They
are also studying design of Mars exploration effort
in light of congressional budget restraints. They are
working on re-designing effort, if possible, around
the constraint of being in the $100 million/year class.
Options include a rebuild with MO spares, multiple small
spacecraft, etc. $100M restraint cost includes launch
vehecile and support. They will make recommendations in
mid/late November. We will know more then.
--
------------------------------------------------------------
Timothy J. Thompson, Earth and Space Sciences Division, JPL.
Assistant Administrator, Division Science Computing Network.
Secretary, Los Angeles Astronomical Society.
Member, BOD, Mount Wilson Observatory Association.
INTERnet/BITnet: tjt@scn1.jpl.nasa.gov
NSI/DECnet: jplsc8::tim
SCREAMnet: YO!! TIM!!
GPSnet: 118:10:22.85 W by 34:11:58.27 N
|
| 528.320 | Mars Observer Investigation Board Status Report (10/22/93) | PRAGMA::GRIFFIN | Dave Griffin | Tue Oct 26 1993 12:14 | 30 |
| Paula Cleggett-Haleim
Headquarters, Washington, D.C. October 22, 1993
The Mars Observer Investigation Board held its third set of meetings,
Wednesday through Friday, Oct. 20-22, in Washington, D.C.
Since the last set of board meetings, technical teams conducted reviews of
specific Mars Observer subsystems at the Jet Propulsion Laboratory, Pasadena,
Calif., and Martin Marietta Aerospace, East Windsor, N.J.
Plausible scenarios for what could have caused the loss of communication
with the Mars Observer spacecraft are still being developed and technically
challenged.
The board previously had recommended a program to attempt to activate the
Balloon Relay Experiment, an instrument onboard Mars Observer. After several
attempts to activate the experiment, ground station engineers did not detect
any return signals. The NASA Deep Space Network stationed at Goldstone,
Calif., and the Jodrell Bank Observatory, United Kingdom, were used.
Non-activation of the Balloon Relay Experiment leads the board to conclude that
a Mars Observer failure scenario involving only the spacecraft downlink portion
of the telecommunications system is highly unlikely.
In the coming weeks, the board will evaluate results of hardware and
software tests, and in some cases, computer simulations of various spacecraft
subsystems.
Late November is still the target timeframe for delivering a final report
to the NASA Administrator, who will make the report publicly available.
|
| 528.321 | End of Mission | CXDOCS::J_BUTLER | E pur, si muove... | Sat Nov 27 1993 10:07 | 82 |
|
Excerpted from Jet Propulsion Laboratory UNIVERSE
Pasadena, California - Vol. 23, No. 22 - November 5, 1993
_________________________________________________________________
Mars Observer concludes operations
By Diane Ainsworth
With no results from the last set of commands sent to the Mars
Observer spacecraft on Oct. 29, flight controllers concluded
scheduled operations.
"The flight team has sent all of the commands that support recovery
from the plausible failure modes we have been able to put
together," said Project Manager Glenn Cunningham. "Since there is
little more to do, the majority of the flight team has been
reassigned to other projects. A small staff has been retained for
the Mars Recovery Study Team effort, which is currently under way."
JPL dissolved the Mars Observer flight team as a technical review
board concluded an investigation into the probable causes of the
apparent loss of the spacecraft. Meanwhile, the Deep Space Network
will continue to listen for the spacecraft through mid-February
1994.
"We have put forth our best guesstimates about what might have
happened to the Mars Observer spacecraft, but without data to work
with, we will never be able to say definitively what happened,"
said Dr. R. Rhoads Stephenson, chairman of the JPL technical review
board.
"It's time to move on to possible return missions to Mars and use
our best instincts to come up with alternatives that can recover
the Mars Observer science in the very near future."
Flight controllers lost contact with the Mars Observer spacecraft
at approximately 6 p.m. on Aug. 21, three days before the
spacecraft was set to fire its main rocket engines and decelerate
into orbit around Mars.
The spacecraft was about to begin pressurizing its fuel tanks in
preparation for the Aug. 24 orbit-insertion maneuver when its
transmitters were turned off and the spacecraft was never heard
from again.
Flight controllers attempted the most critical and probable
commanding strategies to try to restore communications before the
spacecraft was to be captured in orbit around Mars at about 1:30
p.m. on Aug. 24.
Commanding strategies during the weeks following the orbit-
insertion maneuver addressed more unlikely anomalies that could
have occurred onboard the spacecraft.
The last realistic chance to validate that the spacecraft still
existed and was properly operating--except for its telemetry
transmitter--occurred in late September, during a search for a
beacon from a radio relay system onboard the spacecraft by radio
astronomy antennas at Jodrell Bank in England, at Stanford
University, and at the Goldstone tracking facility near Barstow.
"Had the spacecraft been in either of its predicted locations--in
orbit around Mars or in a flyby orbit around the sun--and had it
been able to receive and process commands from the ground, we fully
expected that a signal from its independent radio transmitter would
have been detected," said Dr. Sam Dallas, Mars Observer mission
manager.
While minimal support for ground-tracking of Mars Observer will
continue through mid-February, JPL has begun a Mars Recovery Study
Team effort to explore the most cost-effective, low-risk ways of
recovering the Mars Observer science during the next Mars launch
opportunities in 1996, 1998 and 2000.
The study team, chaired by Dr. Charles Elachi, assistant Laboratory
director for the Office of Space Science and Instruments, will
evaluate all of the possible options, including those that would
involve international cooperation, and hear proposals from U.S.
industry in November. Formal recommendations are expected to be
presented to NASA Headquarters on Nov. 18.
|
| 528.323 | Why don't they just say that they gave up? | SKYLAB::FISHER | Carp Diem : Fish the Day | Mon Nov 29 1993 14:13 | 5 |
| More bureaucratise!
"Mars Observer" concluded operations on Aug 21 :-(
Burns
|
| 528.324 | Mars Observer Investigation Report Briefing | CXDOCS::J_BUTLER | E pur, si muove... | Tue Jan 04 1994 12:35 | 41 |
|
Donald L. Savage
Headquarters, Washington, D.C.
January 3, 1994
(Phone: 202/358-1547)
EDITORS NOTE: N94-1
MARS OBSERVER INVESTIGATION REPORT MEDIA BRIEFING
The final report of the independent board named to
investigate the failure of the Mars Observer mission will be
presented at a media briefing at the NASA Headquarters
auditorium, 300 E Street, S.W., Washington, D.C., at 1 p.m.
EST, Jan. 5.
Dr. Timothy Coffey, Director of Research at the Naval
Research Laboratory, Washington, D.C., will present the board's
findings, recommendations and the process by which they reached
their conclusions. The Mars Observer Mission Failure Review
Board report will be available to news media representatives at
the briefing.
Also on the panel will be Dr. Wesley Huntress, Jr.,
Associate Administrator for NASA's Office of Space Science,
Washington, D.C. and Dr. Edward Stone, Jr., Director of NASA's
Jet Propulsion Laboratory (JPL), Pasadena, Calif. The Mars
Observer mission was managed by JPL for the Office of Space
Science.
Dr. Coffey was appointed Chairman of the board by NASA
Administrator Daniel Goldin following the loss of communication
with the Mars Observer spacecraft on Aug. 21. Coffey named the
five board members who began their investigation in September.
The briefing will be carried live on NASA Select
television with two-way question and answer capability at NASA
centers. NASA Select television is available on SATCOM F2R, 72
degrees West longitude, audio 3600 MHz.
|
| 528.325 | Mars Observer Investigation Report Released | CXDOCS::J_BUTLER | E pur, si muove... | Thu Jan 06 1994 09:51 | 149 |
|
Donald L. Savage
Headquarters, Washington, D.C. January 5, 1994
(Phone: 202/358-1547)
James Gately
Naval Research Laboratory, Washington, D.C.
(Phone: 202/767-2541)
RELEASE: 94-1
MARS OBSERVER INVESTIGATION REPORT RELEASED
The final report by the independent investigation board
on the failure of the Mars Observer spacecraft was delivered
today to NASA Administrator Daniel S. Goldin by Dr. Timothy
Coffey, Chairman of the board. Dr. Coffey is Director of
Research at the Naval Research Laboratory, Washington, D.C.
The Mars Observer spacecraft was to be the first U.S.
spacecraft to study Mars since the Viking missions 18 years
ago. The Mars Observer spacecraft fell silent just 3 days
prior to entering orbit around Mars, following the
pressurization of the rocket thruster fuel tanks.
Because the telemetry transmitted from the Observer had
been commanded off and subsequent efforts to locate or
communicate with the spacecraft failed, the board was unable
to find conclusive evidence pointing to a particular event
that caused the loss of the Observer.
However, after conducting extensive analyses, the board
reported that the most probable cause of the loss of
communications with the spacecraft on Aug. 21, 1993, was a
rupture of the fuel (monomethyl hydrazine (MMH))
pressurization side of the spacecraft's propulsion system,
resulting in a pressurized leak of both helium gas and liquid
MMH under the spacecraft's thermal blanket. The gas and
liquid would most likely have leaked out from under the
blanket in an unsymmetrical manner, resulting in a net spin
rate. This high spin rate would cause the spacecraft to
enter into the "contingency mode," which interrupted the
stored command sequence and thus, did not turn the
transmitter on.
Additionally, this high spin rate precluded proper
orientation of the solar arrays, resulting in discharge of
the batteries. However, the spin effect may be academic,
because the released MMH would likely attack and damage
critical electrical circuits within the spacecraft.
The board's study concluded that the propulsion system
failure most probably was caused by the inadvertent mixing
and the reaction of nitrogen tetroxide (NTO) and MMH within
titanium pressurization tubing, during the helium
pressurization of the fuel tanks. This reaction caused the
tubing to rupture, resulting in helium and MMH being released
from the tubing, thus forcing the spacecraft into a
catastrophic spin and also damaging critical electrical
circuits.
Based on tests performed at the Jet Propulsion
Laboratory (JPL) Pasadena, Calif., the board concludes that
an energetically significant amount of NTO had gradually
leaked through check valves and accumulated in the tubing
during the spacecraft's 11-month flight to Mars.
In addition, the report listed other possible causes of
the loss of the spacecraft as:
* failure of the electrical power system, due to a
regulated power bus short circuit;
* NTO tank over-pressurization and rupture due to
pressurization regulator failure;
* the accidental high-speed ejection of a NASA standard
initiator from a pyro valve into the MMH tank or other
spacecraft system.
Other concerns noted by the board included:
* a need to establish a policy to provide adequate
telemetry data of all mission-critical events;
* the lack of post-assembly procedures for verifying
the cleanliness and proper functioning of the propellant
pressurization system;
* a current lack of understanding of the differences
between the characteristics of European Space Agency and NASA
pyro-initiators;
* the potential for power bus short circuits, due to
single component or insulation failure;
* the potential for command and data handling control
systems to be disabled by single-part failure;
* the lack of fault protection external to the
redundant crystal oscillator (RXO) should one of its two
outputs fail;
* the absence of information, in the telemetry, on the
actual state of the RXO's backup oscillator;
* deficiencies in systems engineering/flight rules;
* too much reliance placed on the heritage of
spacecraft hardware, software and procedures for near-Earth
missions, which were fundamentally different from the
interplanetary Mars Observer mission; and
* the use of a firm fixed-price contract restricted the
cost-effective and timely development of the unique and
highly specialized Mars Observer Spacecraft.
Dr. Coffey notes, "We were challenged to conduct an
extraordinarily complex investigation in which we had no hard
evidence to examine nor communications with the spacecraft.
However, after an extensive analysis covering every facet of
the mission, operations and hardware, I believe that we are
justified in arriving at the conclusions we have. If our
findings will help to ensure that future missions won't
suffer a similar fate, we feel we will have achieved our
purpose."
Dr. Coffey also expressed his appreciation for the
support provided to the investigation board by the six
technical teams, other NRL and Air Force Phillips Laboratory
contributors, NASA representatives, the JPL Project Team and
Investigation Board, and the Martin Marietta Astro Space
technical teams.
"I commend Dr. Coffey and his team for the thoughtful
and thorough research into the tragic loss of the Mars
Observer," said Dr. Wesley Huntress, Jr., Associate
Administrator for NASA's Office of Space Science, Washington,
D.C. "Their work will help and guide us in formulating a
corrective action plan to help ensure future success as we
plan for recovering our Mars science exploration objectives."
- end -
EDITOR'S NOTE: The Mars Observer Investigation Board Report
is available to news media representatives by calling the
NASA Headquarters Newsroom at 202/358-1600
|
| 528.326 | Sigh... | SKYLAB::FISHER | Carp Diem : Fish the Day | Thu Jan 06 1994 13:16 | 11 |
| It will be really interesting to read the complete report...hopefully, AvWeek
will publish it.
I think it's pretty surprising that contingency mode would fail to turn the
transmitter back on. I'd think that it would not make any assumptions about the
state of the S/C and configure EVERYTHING that is configurable.
I wonder how they fix this fuel/oxidizer problem? Maybe two helium tanks with
no common plumbing...
Burns
|
| 528.327 | | DCOPST::TONYSC::SCOLARO | A Spoonful of Sugar .... | Thu Jan 06 1994 13:30 | 7 |
| VERY INTERESTING!!!!!!!!
It was the pressurization after all!!!!
Hmmmm.....
Tony
|
| 528.328 | | HELIX::MAIEWSKI | | Thu Jan 06 1994 14:04 | 11 |
| I agree that not turning the transmitter back on during "contingency mode"
was a bit strange. Sounds like a software bug to me.
Maybe there was some reason such as the procedure for turning the transmitter
back on being to complex for emergency software but that would indicate
other design problems.
Also having the plumbing in the same temperature envelope as the electronics
seemed like a design flaw as well.
George
|
| 528.329 | This obviously assumes they guessed right, also | SKYLAB::FISHER | Carp Diem : Fish the Day | Thu Jan 06 1994 19:57 | 4 |
| Of course, even if it had been turned on, it sounds like MO would have been
toast anyway.
Burns
|
| 528.330 | | HELIX::MAIEWSKI | | Thu Jan 06 1994 20:33 | 9 |
| Possible. As I read it, this thing about the fuel line is an educated guess
with other things being listed as possibilities.
It's possible that if they transmitter had been turned on, the receiver would
have gone on as well. Maybe they could have shut something off or taken some
action to counter act a spin. And maybe not but at least there would have been
a chance of taking some action.
George
|
| 528.331 | 25% chance of receiving LGA signals from spinning MO | SKYLAB::FISHER | Carp Diem : Fish the Day | Fri Jan 07 1994 14:37 | 5 |
| Ron Baalke of JPL indicated on the net that contigency mode would have switched
to the LGA, but if the s/c was spinning there was only a 25% change that a
transmission could have been received.
Burns
|
| 528.332 | | DCOPST::TONYSC::SCOLARO | A Spoonful of Sugar .... | Mon Jan 10 1994 18:43 | 11 |
| In the washington Post today there was an interesting remark.
It appears as if the tank pressurization time was changed from three days after
launch to 3 days before orbit insertion burn. This change occured 7 months
before flight. Apparently however, the spacecraft had hardware optomized for
the early pressurization......
This was one of the very big hitters, but it was not brought out in either the
executive summary or the press conference !!!!
Tony
|
| 528.333 | | SKYLAB::FISHER | Carp Diem : Fish the Day | Mon Jan 10 1994 19:55 | 11 |
| According to (I believe) Mike Malin, former PI for the MOC (camera), those pyros
are normally blown within a couple days of launch and used quickly (on
Earth-orbiting satellites). It was determined sometime during the process that
(I think) the regulators tended to leak a bit, which would mean that if the
pyros were blown within a few days of launch, the tanks might get
overpressurize. So they opted to blow them as MOI approached. What no one knew
was that the check valves might leak a bit backwards, allowing fuel into the
oxidizer line and/or vice versa.
Burns
|
| 528.334 | MO Final Report | VERGA::KLAES | Quo vadimus? | Fri Jan 21 1994 21:45 | 75 |
| From: US1RMC::"fyi@aip.org" "MAIL-11 Daemon" 21-JAN-1994 18:03:51.88
CC:
Subj: fyi#7_distr
Final Report Issued on Mars Observer Loss
FYI No. 7, January 21, 1994
An independent investigative board presented its final report on
the failure of the Mars Observer mission to NASA Administrator
Daniel Goldin on January 5. Communication with the spacecraft,
which had been launched in September 1992, was lost on August 21,
1993, as NASA controllers prepared it to enter Mars orbit.
Though hampered by the lack of communication at the time of the
catastrophe, the Mars Observer Mission Failure Investigation Board,
chaired by Naval Research Lab Director of Research Timothy Coffey,
looked at 60 failure scenarios during its investigation. According
to its report, the Board "first identified technically possible
failure scenarios, eliminated those deemed implausible, and then
categorized the remaining scenarios as either `possible' or `most
probable.'"
While "unable to find clear and conclusive evidence pointing to a
particular scenario as the `smoking gun,' . . . the Board concluded
through a process of elimination that the most probable cause of
the loss of downlink from the Mars Observer was a massive failure
of the pressurization side of the propulsion system, [and] the most
probable cause of that failure was the unintended mixing of
nitrogen tetroxide (NTO) and monomethyl hydrazine (MMH) in the
titanium tubing. . . [This is] believed by the Board to have been
enabled by significant NTO migration through check valves during
the eleven-month cruise phase from Earth to Mars."
This scenario envisions that premature mixing of the NTO and MMH
caused ignition and rupture of the tubing, spilling propellant and
forcing the spacecraft into a spin, as well as damaging electrical
components.
The investigation found that pressurization of the Observer's fuel
tanks was originally planned for five days after launch. However,
reports of problems due to early pressurization in other spacecraft
led managers to decide, in February 1992, to delay pressurization
of the tanks until the Observer approached its intended Mars orbit.
The Board suspected that the check valves, intended to work for
five days in proximity to Earth, allowed some leakage of NTO during
the eleven-month, 450 million-mile journey to the much colder
climate near Mars.
Although mentioned briefly within the body of the report, this
management decision is not included in the summary, which Coffey
claims was "an oversight." The report notes, however, that "the
organization and procedural `system' that developed Mars Observer
. . . failed to react properly to a program that had changed
radically from the program that was originally envisioned. Too
much reliance was placed on the heritage of spacecraft hardware,
software, and procedures, especially since the Mars Observer
mission was fundamentally different from the missions of the
satellites from which the heritage was derived."
Copies of the report summary can be obtained from Donald Savage,
NASA Headquarters, (202) 358-1547.
###############
Public Information Division
American Institute of Physics
Contact: Audrey T. Leath
(301) 209-3094
##END##########
% ====== Internet headers and postmarks (see DECWRL::GATEWAY.DOC) ======
% Date: Fri, 21 Jan 94 17:49:09 EST
% From: fyi@aip.org
% Subject: fyi#7_distr
|
| 528.335 | One more chance to find MO | JVERNE::KLAES | Be Here Now | Mon Mar 28 1994 17:50 | 90 |
| Article: 55183
From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.astro,alt.sci.planetary
Subject: Re: Spotting the Mars Observer
Date: 27 Mar 1994 21:33 UT
Organization: Jet Propulsion Laboratory
In article <CnC8vy.48t@ra.nrl.navy.mil>, hill@enews.nrl.navy.mil
(Tobin Hill) writes...
> Would it be possible to visually locate the Mars Observer,
>based on its last reported location and Keplerian orbital
>parameters? I realize that the error in position approximation
>increases as time marches on, and that there could be quite a large
>area of space to search. If it is possible, is anyone aware of an
>effort to visually locate the Mars Observer, in order to verify the
>findings of the Failure Investigation?
There is no telescope that has the power or resolution to spot a
spacecraft at Mars. There were actually multiple scenarios identified
for the Mars Observer failure. One of them is simply that the
transmitter never came back on, but the spacecraft is OK otherwise.
If this is the case, the spaceraft can receive commands from Earth,
but can't send anything back. To test out this theory, there will be
one last attempt in May to command the Mars Balloon Relay on and try
to detect the signal using the Arecibo antenna.
___ _____ ___
/_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
| | | | __ \ /| | | | Jet Propulsion Lab |
___| | | | |__) |/ | | |__ Galileo S-Band | A mind stretched by a new
/___| | | | ___/ | |/__ /| Pasadena, CA 91109 | idea can never go back to
|_____|/ |_|/ |_____|/ | its original dimensions.
Article: 55231
From: mc@msss.com (Mike Caplinger)
Newsgroups: sci.astro
Subject: Re: Spotting the Mars Observer
Date: 28 Mar 1994 10:51:41 -0600
Organization: UTexas Mail-to-News Gateway
Sender: daemon@cs.utexas.edu
Actually, while seeing MO at Mars is impossible, calculations that
I've done suggest that there is some chance of seeing MO with HST,
assuming it is in the flyby orbit, when it makes its closest
approaches to Earth. The next opposition occurs in 1995 (distance
about 0.5 AU); there is a very close approach (about 0.1 AU) in 2000.
Magnitude would be between 25 and 29, depending on what assumptions
you make (and discounting specular glints, which would make the
spacecraft somewhat brighter.)
Is this worth doing? The best positive result would be that MO is in
the flyby orbit and did not explode (which is the most likely outcome
according to the review board reports.) A negative result would be
very ambiguous; it would suggest that MO was in martian orbit, or that
it exploded, or perhaps that it was just too dim to see; the chances
of visibility are somewhat marginal. Measurement of its rotation rate
appears impossible (long integration times are needed to see it at all.)
Making this observation has more to do with engineering and nostalgia
than with science; nevertheless, I am toying with the notion of
proposing this for the next HST cycle.
Mike Caplinger, MSSS/Caltech Mars Observer Camera Project
mc@msss.com
Article: 55199
Newsgroups: sci.astro
From: rubin@baseworx.att.com (Dan Rubin)
Subject: Re: Spotting the Mars Observer
Sender: news@nntpa.cb.att.com (Netnews Administration)
Organization: AT&T Bell Labs, Columbus, Ohio
Date: Mon, 28 Mar 1994 01:12:58 GMT
>This would be a great idea, except that the Mars Observer is much
>too small and faint to be detected visually (or any other way, for
>that matter) from Earth.
Plus, I think the popular scenario is that the observer blew up because
of oxidizer slowly leaking during the 6 month trip. Popular Science has
a very informative article about the whole thing this month. It would be
like looking for a needle, that may not be there, in a haystack...
- Dan
--
Daniel Rubin rubin@cbzoo.att.com _/_/_/_/ _/_/_/_/ Go Bucks
Systems Administrator _/ _/ _/_/ _/ _/
AT&T Bell Labs Columbus, Ohio _/_/_/_/ _/_/ _/ _/
(614) 860-6487 Go Bucks _/_/_/_/ _/_/_/_/
|
| 528.336 | A few million do matter | MTWAIN::KLAES | Keep Looking Up | Wed Jun 01 1994 14:24 | 38 |
| From: VERGA::US4RMC::"space-activists@world.std.com" "MAIL-11 Daemon"
1-JUN-1994 08:33:56.86
To: space-activists@world.std.com
CC:
Subj: Paying for Mars Observer
Many thanks to Charles for his summary of the latest HR bill.
Looks very interesting. Within the text of that message, however, he
states that the taxpayers were out $1B for MO. This is not quite correct.
I worked on MO (We often called her "MOna") at GE Astro in
East Windsor, NJ. (Now Martin Marietta AstroSpace). For this reason,
I paid close attention to the news reports. First, MO was priced at
$970 M. I know $1B is close enough, but, gee, I'd sure like to have
the $30M difference in my pocket. Second, the taxpayers weren't out
"$1B." This is because NASA stopped payment to Martin Marietta
shortly after the bird was lost. Total payment, if memory serves, was
about $700 M. This is noticeably less than $1B. Finally, the
remaining $270 M would be more than sufficient to build a replacement,
since twice as many parts were manufactured for the entire bird than
necessary, with the exception of the Bus and the Solar Arrays. NASA
has simply chosen not to build this replacement.
Overall, Charles wrote a great piece, but I just wanted to
correct a few minor mistakes in an area I've paid some attention to.
Greg Weidman
weidman-alx1@kaman.com
% ====== Internet headers and postmarks (see DECWRL::GATEWAY.DOC) ======
% Date: Wed, 01 Jun 1994 08:08:23 -0400 (EDT)
% From: WEIDMAN <weidman-alx1@kaman.com>
% Subject: Paying for Mars Observer
% To: space-activists@world.std.com
% X-Envelope-To: space-activists@world.std.com
% Sender: space-activists-approval@world.std.com
% Reply-To: space-activists@world.std.com
|
| 528.337 | Re -.1 | MAYDAY::ANDRADE | The sentinel (.)(.) | Thu Jun 02 1994 09:38 | 10 |
| Gee, and me that always tought that the $1B included 2 to 4 years
of operations in Mars Orbit as well as the cruise operations and
and launch costs.
Now it turns out that $970 M, was just to build the craft !!! by
Martin Marietta AstroSpace. geeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
but that was one hell of an expensive bird. What would have been
the total program cost $2B ? (-;
Gil
|
| 528.338 | MO Corrective Action Plan available | MTWAIN::KLAES | Keep Looking Up | Tue Jun 21 1994 16:55 | 37 |
| From: US4RMC::"yee@atlas.arc.nasa.gov" "Peter Yee" 21-JUN-1994 04:32:39.03
To: usenet-space-news@arc.nasa.gov
CC:
Subj: Mars Observer Corrective Action Plan available [NTE 94-43] (Forwarded)
Donald L. Savage
Headquarters, Washington, D.C.
June 15, 1994
(Phone: 202/358-1547)
NOTE TO EDITORS: N94-43
MARS OBSERVER CORRECTIVE ACTION PLAN AVAILABLE
NASA today released the Mars Observer Corrective Action Plan,
an evaluation of the Mars Observer failure review efforts. The
Corrective Action Plan is designed to identify lessons learned and
determine specific actions to be taken by the Agency to prevent
failures such as the Mars Observer in the future.
The 257-page Mars Observer Corrective Action Plan is available
to news media representatives by calling the NASA Newsroom at
202/358-1600. A five-page executive summary is available by fax by
calling the same number.
% ====== Internet headers and postmarks (see DECWRL::GATEWAY.DOC) ======
% From: yee@atlas.arc.nasa.gov (Peter Yee)
% Newsgroups: sci.space.news
% Subject: Mars Observer Corrective Action Plan available [NTE 94-43]
% Date: 21 Jun 1994 00:32:52 -0700
% Organization: NASA Ames Research Center, Moffett Field, CA
% Approved: sci-space-news@ames.arc.nasa.gov
% Distribution: world
% Reply-To: yee@atlas.arc.nasa.gov (Peter Yee)
% Originator: yee@atlas.arc.nasa.gov
|
| 528.339 | Historical Background | MTWAIN::KLAES | No Guts, No Galaxy | Wed Sep 14 1994 22:05 | 342 |
| Article: 71142
From: larrymor@crl.com (Laurence A. Moore)
Newsgroups: sci.astro
Subject: Mars Observer
Date: 13 Sep 1994 20:51:42 -0700
Organization: CRL Dialup Internet Access (415) 705-6060 [login: guest]
From: daves@regulus.demon.co.uk ("David M. Swain")
> I'm after information of the Mars Observer program for an
> article I'm writing, purely for personal gratification at the
> moment but you never know. I'm hoping to document the course of
> the Mars Observer project from its beginnings to its untimely
> end, so if anyone can help me I would be most grateful.
I'm a writer too, Dave. Know what you mean. Here's what I found:
"The United States and the Soviet Union have agreed on a new
space pact that calls for cooperation in the unmanned exploration
of Mars, other planets and deep space, it was reported yesterday.
// Aviation Week & Space Technology magazine said 16 cooperative
programs were negotiated in the pact which may be signed formally
by President Reagan and Soviet leader Mikhail Gorbachev during a
summit meeting in early 1987. // 'The 16 programs endorsed
center on coordination of projects and exchange of data rather
than development of joint space mission hardware,' the magazine
said. /.../ During negotiations last week, the Russians
proposed a cooperative unmanned mission to Mars to return samples
of Mars' soil to Earth, a program that Russia hopes to undertake
in the late 1990s. However, the United States rejected the idea
because no such mission has been approved for NASA. // But the
two nations agreed on 'significant Mars mission cooperation,'
Aviation Week said, including the sharing of data from missions
such as the Soviet Phobos probe to study Mars' moons and the
American Mars Observer spacecraft to be launched in the early
1990s. // The Russians would also share data from flights to
Venus and Mars in return for similar treatment from the United
States with the planned Magellan probe to Venus and the Mars
Observer. // In addition, the superpowers agreed to share data
from life science investigations, astronomy, astrophysics, earth
sciences and other fields of space science. // 'The new
agreement specifically limits technology transfer to the Soviets,
although some segments of the Defense Department are expected to
continue opposition to the renewed cooperation,' Aviation Week
said." --- San Francisco Chronicle, 11 November 1986 (UPI)
"A last-ditch lobbying effort on Capitol Hill and the offer of a
privately funded rocket have failed to keep NASA's Mars Observer
mission on course for a 1990 launch. Ultimately, the impact of
the mission's budgetary slowdown, begun last year after NASA
tentatively announced plans to delay the launch until 1992, made
a 1990 launch unattainable despite possible Congressional funding
of a rocket for the mission. /.../ According to Bruce Murray,
former director of the Jet Propulsion Laboratory and vice
president of the Planetary Society, 'NASA had no reason to delay
the Mars Observer except for its preoccupation with marketing the
Shuttle and Space Station.' /.../ 'The delay of the mission is
inconsistent with the widely recognized need for a new
exploratory goal and the exploration of Mars as a focus for
NASA,' said [Carl] Sagan. 'This is one further indication of the
low priority NASA places on space science and planetary
exploration.'" --- AstroNews, Astronomy 15(8):65, August 1987
"'The Viking biology experiments gave us essentially no
information about life on Mars,' recalls Christopher P. McKay of
the NASA Ames Research Center at Moffett Field, Calif. /.../
The next U.S. Mars mission, scheduled for launch in 1992, will
only orbit the planet, not land on it, and Soviet researchers
have given only brief indications that any of the four planned
Soviet missions -- the first of them due to take off next summer
-- would be equipped to carry on the search for life. // But a
satellite-aided television conference-call last week between
space-program representatives from the two superpowers left the
U.S. participants with the feeling that Soviet interest in the
issue has been underestimated. /.../ Even apart from further
searches for Martian life-forms, many U.S. space scientists have
expressed frustration in recent years about the decline in NASA's
plans for planetary exploration, including Mars missions beyond
the planned 1992 'Mars Observer.' /.../ A staunch advocate of
human exploration of Mars as a goal, in part, to get the U.S.
space program back on track for the future, [former NASA
Administrator Thomas] Paine told the Boulder meeting: 'If there
isn't life on Mars, and if there wasn't life on Mars, there's
damned well going to be.'" --- Jonathan Eberhart, Science News
132(5):68-69, 1 August 1987
"The first race to Mars was in full swing fifteen years ago. By
1972 the Soviet Union had already launched eleven missions to
Mars, the United States six. The U.S. Mariner 9 was orbiting the
planet and had returned the first photos of Phobos and Deimos,
the two Martian moons. The Soviets launched four spacecraft in
the summer of 1973, but three of these failed and the Soviets
dropped out of the race. In 1975 the United States launched the
Viking mission -- the country's single most expensive planetary
mission ever undertaken -- and successfully landed two spacecraft
on Mars. // Over a decade has passed since either country has
mounted a mission to Mars. Now both superpowers are poised at
the starting line of what looks like a second race to the Red
Planet. Less than nine months from now the Soviet Union will
launch the two Phobos spacecraft to explore Mars and its moons.
The U.S. Mars Observer orbiter mission, which has been postponed
until 1992, was originally set to launch in 1990. Both countries
are planning additional missions: the Soviets will return in 1992
with the Vesta mission; the United States is studying Martian
rovers and sample-return missions." --- Stephen Cole, Astronomy
15(11):26-28, November 1987
"Because of its very low orbit and sensitive instruments, Mars
Observer will be able to study Mars in unprecedented detail. The
experiments on board the spacecraft will map the elemental
composition and mineralogy of the entire surface, study the
circulation of the Martian atmosphere, and follow the movement of
dust and volatiles such as carbon dioxide and water through a
complete seasonal cycle. /.../ An intensive study of the global
characteristics of Mars was not one of the objectives of the most
extensive Mars missions to date, the U.S. Viking mission,
launched in 1975. The two Viking orbiters carried only three
scientific instruments: a television camera system, a thermal
mapper, and an atmospheric water detector. The two landers
analyzed soil samples but only at two widely separated locations.
/.../ Scheduled for launch from the space shuttle in the fall of
1992, Mars Observer will travel for one year before reaching
Mars. It will orbit the planet from pole to pole at an average
altitude of only 225 miles. The orbit will stay oriented toward
the Sun, which will always be kept at a 2 o'clock position in
relation to the spacecraft, to make the most of the available
sunlight at Mars. The mission will last at least 687 Earth-days,
or one full Martian year. // Although Mars Observer is a
relatively low-cost mission with a budget of just $212 million,
it will conduct a lot of science for its size. /.../ The Soviet
Vesta mission, which includes an automated lander, is scheduled
to be on Mars at the same time Mars Observer is orbiting the
planet. 'We may be able to actually see their lander at work,'
[Michael C.] Malin says, 'and they may want us to help them pick
out their landing site.'" --- Donald Frederick Robertson, "U.S.
Mars Observer Seeks Global Picture", Astronomy 15(11):33-37,
November 1987
"If you can jump from the floor of your earthbound study to the
top of your desk, gaining enough altitude on the way for your
feet to be above the desktop with your legs hanging straight
down, you could jump into orbit from the surface of Phobos. In
fact, you wouldn't have to settle for just an orbit around the
little Martian moon -- you could end up circling Mars itself. //
Phobos is tiny, with less than 1/500th of earth's 'average
diameter' (a term sometimes necessary when describing an
irregular moon whose shape more resembles a potato than a ball)
and a mass about 1.6 billionths of earth's. A 150-pound
earthling on Phobos would weigh about 1 ounce. // Yet if all
goes as planned, this little dark-gray rock -- roughly (to put it
mildly) 14 miles across -- will soon become the fourth
extraterrestrial body on which spacecraft from earth have landed.
Two separate launchings are to take place early next month from
the Soviet Union, each sending aloft an unusual combination of
craft that will not only land on Phobos but also poke holes in
it, zap it from orbit with lasers and ion beams, and hop across
its surface. // The two multipurpose spacecraft of the Soviet
mission, which is called simply 'Phobos,' are to lift off on July
7 and 12, reaching the vicinity of Mars about 200 days later.
The second craft was originally intended to visit the other, and
even tinier, Martian moon, Deimos, though the Soviets now
apparently plan to send both to Phobos. /.../ The only
presently approved U.S. Mars mission is called the Mars Observer,
an orbiter scheduled to be launched in 1992 and which, if it
lasts long enough, could result in scientific operations going on
at the same time as those of an elaborate Soviet mission due in
1994. /.../ More than a dozen countries are involved in the
Phobos project, including several member-nations of the European
Space Agency, and several U.S. researchers are serving as
scientists with the mission, including working on individual
experiments as co-investigators. Still unknown, however, is
whether the two superpowers will decide to collaborate on the
much more elaborate and costly -- indeed, audacious -- objective
of multinational human exploration of another world." ---
Jonathan Eberhart, "Phobos: Mission to a Martian Potato", Science
News 133(25):392-393, 18 June 1988
"The first spacecraft in thirteen years to head toward Mars will
be launched this July by the Soviet Union. According to U.S.
scientists, the Phobos mission, a pair of probes that will
investigate Mars and its two moons Phobos and Deimos, is an
ambitious and daring endeavor that clearly demonstrates recent
Soviet advances in space science. // 'Soviet space technology
in general has not been up to U.S. capabilities,' said Larry
Esposito, associate professor at the University of Colorado
(Boulder) Laboratory for Atmospheric and Space Physics. 'A
decade ago we had a clear lead in every aspect of space science
technology, but the gap has been getting smaller. There is some
argument now as to whether it exists at all.' // The sheer
scale of Phobos -- thirty-one instruments from twelve countries
studying the Martian system, the Sun, and the solar wind -- puts
it in the big leagues. 'Phobos is a very solid mission,' said
Esposito, who is working on both the Soviet mission and the U.S.
Mars Observer mission scheduled for launch in 1992. 'It is a
larger-scale mission than Mars Observer, which has much more
focused objectives and only a half-dozen instruments.'" ---
Astronomy 16(7):12, July 1988
"Atlantis found a hole in the clouds and cruised into orbit
yesterday 184 miles above Earth while five astronauts prepared to
propel NASA's Magellan probe on a mapmaking journey to Venus.
/.../ It was the United States' 60th manned space flight, the
29th for the shuttle and the fourth since the Challenger
explosion more than three years ago. /.../ In October, another
Atlantis crew is to start the Galileo probe on its way to
Jupiter, the Hubble Space Telescope is scheduled for launch from
a shuttle early next year, Ulysses is to orbit the sun in October
1990 and the Mars Observer spacecraft will be dispatched in 1992
on an unmanned rocket. /.../ When Magellan reaches Venus in
August 1990, it is to fire into orbit and start its 243-day
mapping assignment. // 'The goal is to obtain radar images of
at least 70 percent of the planet,' said Stephen Saunders,
Magellan project scientist. // The radar is designed to pierce
Venus' clouds of sulfuric acid and produce images showing
features as small as 100 yards across, the size of a football
field. By comparison, two 1983 Soviet spacecraft captured
features about 1,200 yards across and the 1978 Pioneer-Venus
could not distinguish anything smaller than 60 miles across."
--- San Francisco Chronicle, 5 May 1989 (AP)
"Despite its small size, Mars is similar to Earth in many ways.
It turns on its axis in 24 hours and 37 minutes, making a Martian
day slightly longer than an Earth day. Mars' axis is tilted over
at an angle of 25o, compared to Earth's 23.5o inclination. As a
result, Mars exhibits Earthlike seasonal changes. Summers turn
to winters; winters end with the warming of spring, though even a
warm day at most sites on Mars is no better than a balmy day in
Antarctica. // Mars also reminds us of Earth because its
atmosphere has familiar-looking clouds and daily cycles of
weather. But the atmosphere is thin. The pressure at the
surface of Mars is only about 1 percent that of Earth (about as
thin as the Earth's atmosphere 20 miles above the surface). //
Carbon dioxide, a so-called 'greenhouse gas,' is the chief
component of the Martian atmosphere. /.../ Dark markings are
the features visible from Earth. They are areas blown free of
Mars' pervasive red dust by prevailing winds." --- Diane
Ainsworth, "Mars Observer: Return to the Red Planet", Astronomy
20(9):28-37, September 1992
"On August 24, 1993, Mars Observer will become the first American
spacecraft to arrive at the Red Planet in 17 years. From a polar
orbit 250 miles above Mars, the spacecraft will map the planet's
surface and monitor changes in its weather over a full Martian
year (687 Earth days). // But getting started on the
450-million-mile voyage wasn't easy. Four days after the probe
arrived as the launch pad, technicians discovered debris
contaminating the craft. During last-minute preparations to
protect the spacecraft from Hurricane Andrew, debris entered a
nitrogen line designed to keep the spacecraft in a clean
environment. Cleaning up the spacecraft delayed the launch nine
days. But on September 25, the Titan 3 rocket lifted off launch
pad 40 at Cape Canaveral, carrying Mars Observer into Earth
orbit. // Shortly after reaching orbit, an upper stage called
the Transfer Orbit Stage (TOS) fired to propel the probe toward
Mars. This was the first flight of a TOS -- and the new booster
gave mission planners a scare when it failed to send any signals
back about its health or whether it had even fired. // The crew
of a tracking aircraft over the Indian Ocean reported seeing a
flash of light when the TOS was supposed to have ignited. A
tense hour of radio silence was finally broken when signals from
the Mars Observer craft indicated that it had separated from the
TOS in good health and was on its way to Mars. The upper stage
had worked fine, but a failed radio transmitter on the TOS (Mars
Observer's radios were fine) had prevented it from sending word
of its performance back to Earth. // In the days following
launch, Mars Observer extended its high-gain antenna, solar
panels, and two booms containing science instruments. On the way
to Mars, one instrument, the Gamma Ray Spectrometer, will watch
for bursts of gamma rays coming from distant sources in the Milky
Way and beyond. The other instruments will remain inactive until
the craft arrives at Mars late this year." --- Space News,
Astronomy 21(1):24, January 1993
"An abrupt, inexplicable loss of communications with the Mars
Observer spacecraft, just before it was to orbit the planet
tomorrow, has threatened the prospects of success for the
nation's first mission to Mars in 17 years. // Officials of the
National Aeronautic and Space Administration [NASA} said
yesterday that the $400 million spacecraft did not respond to
messages radioed by ground controllers Saturday night. Further
attempts to communicate, made every 20 minutes since then, have
been met with nothing but silence. /.../ At the worst, flight
controllers might not re-establish communications, and the
spacecraft would speed past Mars, never to go into orbit." ---
John Noble Wilford, New York Times, San Francisco Chronicle, 23
August 1993
"August 21 proved a remarkably bad day for the nation' space
program. NASA engineers lost all communication with the Mars
Observer shortly before the $980 million spacecraft was to begin
orbiting the Red Planet. And NOAA-13, a new weather satellite,
fell silent as well." --- Science News 144(9):134, 28 August 1993
"NASA, stung by the apparent loss of its Mars Observer probe, got
some good news Saturday when its Galileo spacecraft made the
second ever flyby of an asteroid. // Galileo, on its way to a
1995 encounter with Jupiter, swooped within 1,500 miles of the
asteroid Ida at 9:52 a.m. PDT Saturday [28 August], taking
snapshots of the small, rocky body as it raced by at 27,700 mph.
/.../ The $1.5 billion Galileo probe, which has a jammed main
antenna, also took infrared images of the asteroid, which lies in
the asteroid belt between Mars and Jupiter about 275 million
miles from the sun. // The infrared images will help scientists
gain clues about the composition, geology and temperature of Ida,
an irregularly shaped asteroid about 20 miles long and about 17.5
miles in diameter. /.../ Galileo made the first ever encounter
with an asteroid when it flew by Gaspra in 1991. The probe has
also flown by the Earth twice and Venus once, using the planets
for a gravity boost to reach Jupiter. // Because the craft must
use a secondary antenna that sends data back at a relatively slow
speed, the pictures and other data from the encounter will be
played back in September and in the spring of 1994. /.../
Galileo will reach Jupiter, the largest planet, in December
1995." --- San Francisco Examiner, 29 August 1993 (Reuters)
"Mars Observer is all set. On August 24 the space probe will
fire its engines and enter a looping orbit around Mars. Launched
in September 1992, the NASA spacecraft will spend two years
mapping the surface of Mars and monitoring its weather. /.../
When Mars Observer arrives at its destination, controllers will
use the extra fuel to perform a 'power in' approach, braking the
spacecraft and dropping it more rapidly to its low-altitude
mapping orbit. If all goes according to plan, Mars Observer will
begin mapping November 22. The early date should allow the
spacecraft to get in one 26-day-long mapping cycle of the entire
globe of Mars before the planet disappears behind the Sun on
December 20 and ground controllers lose communication with the
spacecraft for two weeks." --- Space News, Astronomy 21(9):20,
September 1993
"Acknowledging that the first U.S. mission to Mars in 17 years is
almost certainly a failure, NASA has appointed a task force to
find out what went wrong. Engineers lost contact with the Mars
Observer spacecraft on Aug. 21, just three days before it was to
begin orbiting the Red Planet." --- Ron Cowen, Science News
144(10):149, 4 September 1993
Hope that helps, Dave.
- Larry
larrymor@crl.com
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