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"930416.DFC" (68778 bytes) was created on 04-16-93
16-Apr-93 Daily File Collection
These files were added or updated between 15-Apr-93 at 21:00:00 {Central}
and 16-Apr-93 at 21:09:42.
=--=--=START=--=--= NASA Spacelink File Name:930416.SHU
KSC SHUTTLE STATUS 4-16
KENNEDY SPACE CENTER SPACE SHUTTLE STATUS REPORT
Friday, April 16, 1993
KSC Contact: Bruce Buckingham
Mission: STS-56/ATLAS-2/SSBUV Orbital altitude: 184 miles
Vehicle: Discovery/OV-103 Inclination: 57 degrees
Crew size: 5
KSC Landing Date/Time: Saturday, April 17, 7:38 a.m. EDT
NOTE: The Shuttle Discovery remains on orbit today after NASA
managers canceled today's scheduled landing because of unaccep-
table weather conditions at KSC's Shuttle Landing Facility. Land-
ing is now set for 7:38 a.m. EDT, Saturday at KSC. Deorbit burn
is scheduled for 6:34 a.m. tomorrow.
-----------------------------------------------------------------
Mission: STS-55/SL-D2 Orbital Altitude: 184 miles
Vehicle: Columbia/OV-102 Inclination: 28.45 degrees
Location: Launch Pad 39-A Crew Size: 7
Mission Duration: 8 days/22 hours KSC Landing: May 3
Target Launch Date: NET April 24
Launch Window: 10:52 a.m. - 12:22 p.m.
IN WORK TODAY:
* Launch countdown preparations
* Payload bay closeouts
* Close payload bay doors for flight
* Aft engine compartment closeouts
WORK SCHEDULED:
* Ordnance installation (Sunday)
* Hypergolic fuel pressurization (Sunday)
* Fuel cell storage tank purges (Monday)
* Countdown begins 4:00 p.m. Wednesday
* Crew arrival at KSC (Wednesday morning)
WORK COMPLETED:
* Spacelab closeouts and final servicing of experiments
* External tank purges
* Main propulsion system foam insulation work
-----------------------------------------------------------------
Mission: STS-57/Spacehab/EURECA-Retrieval Orbital Alt.: 287 miles
Vehicle: Endeavour/OV-105 Inclination: 28 degrees
Location: Vehicle Assembly Building Crew Size: 6
Mission Duration: 7days/23 hours Target KSC Landing: May 27
Target Launch Date: May 19
IN WORK TODAY:
* Main engine installation
WORK SCHEDULED:
* Hydraulic fluid circulation and sample tests
* Rollout to pad 39-B targeted for NET April 26
WORK COMPLETED:
* External tank foaming operations
* Shuttle interface test
* SRB hydraulic closeouts
# # # #
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:930416.SKD
Daily News/Tv Sked 4/16/93
Daily News
Friday, April 16, 1993 Two Independence Square, Washington, D.C.
Audio Service: 202/358-3014
% Discovery scheduled to land Saturday morning;
% ACTS satellite readied for upcoming launch;
% NASA technology honored;
% Scientist measure chlorine in ozone.
Discovery's STS-56 mission has been extended
one more day due to weather conditions at the
Kennedy Space Center landing site. Weather
conditions are expected to improve for a
landing tomorrow morning at approximately
7:40 a.m. EDT. Edwards AFB also is an
alternate landing spot for the Discovery Space
Shuttle.
* * * * * * * * * * * * * * * *
A milestone in payload processing for the
upcoming STS-51 mission was achieved this
week. Having not yet completed its current
mission, Discovery's next major payload is
being readied for launch. The Advanced
Communications Technology Satellite(ACTS)
was mated to its upper stage booster, a
Transfer Orbit Stage. This processing
milestone will be followed with integrated tests
between the two payload flight elements.
ACTS is a communication satellite designed to
test an experiment advanced satellite
communications concept. ACTS is scheduled
to be deployed from Discovery shortly after
launch which is currently targeted in mid-July.
* * * * * * * * * * * * * * * *
Today, NASA technology, developed to keep
astronauts cool on the moon, and a NASA
patient-monitoring device, are being inducted
into the U.S. Space Foundation's Technology
Hall of Fame.
NASA Administrator Daniel S. Goldin will be
the keynote speaker at the banquet. John
Stamos, the former head of the technology
transfer office at the Langley Research Center,
along with Thayer Sheets, a technology
transfer specialist at the time the technology
was transfered to commercial industries, will
accept the honors. The ceremonies are part of
the Foundation's annual convention in
Colorado Springs, Colo.
* * * * * * * * * * * * * * * *
Scientists have discovered that ozone-
destroying forms of chlorine existed for much
longer in the Arctic stratosphere this winter
than the previous winter. The ozone
abundance in the Northern Hemisphere was
observed to be some 10 percent below that
measured during the same period last year.
By using NASA's Upper Atmosphere Research
Satellite scientists at NASAUs Jet Propulsion
Laboratory (JPL), Calif. and Edinburgh
University, Scotland, will have the opportunity
to collect daily maps of the ozone and other
gases and of temperature in different layers of
the stratosphere. One of the most critical
measurements is of chlorine monoxide, a form
of chlorine that destroys ozone.
Scientists were able to measure large
abundances of chlorine monoxide in the Arctic
last year. However, the concentrations
decreased after the stratosphere warmed in
late January. This winter, the stratosphere
remained cold through February and chlorine
monoxide remained abundant through early
March.
According to Dr. Joe Waters of JPL, they do
not see a well-defined area of ozone loss that
could be described as an Arctic ozone hole.
However, the smaller abundance of ozone
detected throughout the northern hemisphere
this winter raises the question of whether the
chlorine destruction of ozone has been spread
over a wider area.
Here's the broadcast schedule for Public Affairs events on NASA
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.
NASA TV will continue with its 24-hour a day coverage of
the STS-56 mission.
NASA TV is carried on GE Satcom F2R, transponder 13, C-Band, 72 degrees West
Longitude, transponder frequency is 3960 MHz, audio subcarrier is 6.8 MHz,
polarization is vertical.
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:6_2_18_5.TXT
NOTE: This file is too large {29223 bytes} for inclusion in this collection.
The first line of the file:
- Current Two-Line Element Sets #175 -
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:6_2_2_43_7.TXT
STS-55 Keplerian Elements (Predicted)
STS-55 elements (April 24 launch)
STS-55
1 00055U 93114.67000478 .00120200 00000-0 36300-3 0 69
2 00055 28.4697 267.1108 0003812 314.2100 45.8202 15.90487610 22
Satellite: STS-55
Catalog number: 00055
Epoch time: 93114.67000478 = (24 APR 93 16:04:48.41 UTC)
Element set: JSC-006
Inclination: 28.4697 deg
RA of node: 267.1108 deg Space Shuttle Flight STS-55
Eccentricity: .0003812 Prelaunch Keplerian Elements
Arg of perigee: 314.2100 deg Launch: 24 APR 93 14:52 UTC
Mean anomaly: 45.8202 deg
Mean motion: 15.90487610 rev/day G. L. Carman
Decay rate: 1.2020e-03 rev/day~2 NASA Johnson Space Center
Epoch rev: 2
G.L.CARMAN
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:6_2_2_44_12_37.TXT
ATLAS-2 STATUS REPORT &16
ATLAS 2 Public Affairs Status Report #16
6:00 p.m. CDT, April 15, 1993
7/17:31 MET
Spacelab Mission Operations Control
Marshall Space Flight Center
Huntsville, Alabama
The Discovery crew maneuvered the orbiter's cargo bay to to face the sun this
morning for the last of four ATLAS 2 solar observation periods. All four solar
experiments -- the Active Cavity Radiometer Irradiance Monitor (ACRIM), the
Solar Constant (SOLCON) and Solar Spectrum (SOLSPEC) experiments, and the Solar
Ultraviolet Spectral Irradiance Monitor (SUSIM) -- added six orbits of
observations to the excellent data they acquired during previous solar periods.
The Shuttle Solar Backscatter Ultraviolet (SSBUV) operated in its solar-viewing
mode during the last two sun orbits. Solar observations are a vital part of
this atmospheric mission, because energy coming down from the sun drives the
Earth's climate system and the photochemistry of ozone in the stratosphere.
Co-Investigator Roger Helizon, of NASA's Jet Propulsion Laboratory, is
especially pleased with comparative measurements his team has made with the
ATLAS 2 SOLCON experiment and with similar instruments aboard the Upper
Atmosphere Research Satellite (UARS) and the European Retrievable Carrier
(EURECA). "ATLAS 2 is the first time we have been able to retrieve our data
during the mission, and thus far rough comparisons of the four instruments have
been very close indeed." SOLCON Principal Investigator Dr. Dominique
Crommelynck agreed, saying, "The coincidence is amazing."
The solar constant experiments, designed to take measurements to an accuracy of
one-tenth of one percent, are part of a long-term plan during which scientists
hope to collect 100 years of data on solar variations. The total energy output
of the sun varies only slightly, but variations of just one-half percent over a
time scale of decades are thought to be capable of creating major climate
changes. Observations of the sun made from space, above the distortions of the
atmosphere, can be much more precise than ground-based readings. The first
observations with this level of accuracy were made by NASA's Solar Maximum
Mission Satellite in the 1980s.
The crew placed the Shuttle in a special attitude during the fifth solar orbit
to calibrate the SUSIM experiment. Then, on the last sun-viewing orbit, they
executed a complex maneuver called a "criss-cross scan" to allow the other
solar instruments and SSBUV to pinpoint the exact center of the sun. A
standard criss-cross scan, during which the orbiter panned the instruments
across the disc of the sun vertically and horizontally, was completed during
the first solar orbit of the mission. Today's maneuver added two diagonal
scans to enhance the precision of the calibration. Scientists monitoring their
instruments at Spacelab Mission Operations Control declared the calibration to
be extremely successful. Instrument teams will use the calibration to ensure
exact match-ups of their readings during post-flight comparisons.
The six-orbit solar session ended at about 2:30 p.m., and the crew reoriented
the Shuttle for a few more orbits of atmospheric studies for SSBUV and the
Atmospheric Trace Molecule Spectroscopy (ATMOS) experiment. As expected, the
Shuttle's Remote Manipulator System arm, which was stowed in accordance with
flight rules 24-hours prior to nominal landing time, blocks the view of the
Millimeter Wave Atmospheric Sounder (MAS). Therefore, the MAS instrument has
ceased operations for the remainder of the mission.
Currently, crew members are scheduled to deactivate the payload at about 9:30
p.m. CDT. Science teams and payload controllers at Marshall are still awaiting
word as to whether the Shuttle landing will be delayed due to weather. ATLAS
instruments might have an opportunity for bonus observations, the length and
nature of which will depend upon when a decision is made to postpone landing.
"After the mission, scientists will start the hard and painful process of
translating their raw data into geophysical parameters reflecting the amounts
of ozone, the strength of solar ultraviolet radiation and the total energy from
the sun," said NASA Headquarters Program Scientist Dr. Jack Kaye. "Only then
will they be able to 'do science' with the data to learn more about the sun and
the atmosphere." Kaye added that another important ATLAS 2 objective will begin
then as well -- comparing measurements with those of sister instruments flying
on the Upper Atmosphere Research Satellite, Total Ozone Mapping Spectrometers
aboard NASA's Nimbus 7 and Russia's Meteor 3 satellites, and National Oceanic
and Atmospheric Administration's Solar Backscatter Ultraviolet (SBUV/2)
instruments on NOAA 9 and NOAA 11. The data ultimately will be deposited in
Earth Observing System Data Information System archives at NASA's Goddard Space
Flight Center, where it will be available to atmospheric scientists around the
world.
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:6_2_2_44_12_38.TXT
ATLAS 2 Public Affairs Status Report #17
6:00 a.m. CDT, April 16, 1993
8/05:31 MET
Spacelab Mission Operations Control
Marshall Space Flight Center
Huntsville, Alabama
Instruments aboard the ATLAS-2 payload have additional
opportunities to make solar and atmospheric measurements, due to a
weather-related landing delay.
Atmospheric and solar scientists stationed at the Spacelab Mission
Operations Control center in Huntsville, Ala., monitored their
instruments during deactivation procedures shortly after 10:30 p.m.
CDT, as the second Atmospheric Laboratory for Applications and
Science mission prepared for completion. Then, at around 4:15 a.m.
CDT, STS-56 was waved off from landing on Friday.
The Spacelab pallet systems will be reactivated at about 9:00 a.m.
CDT, and the Active Cavity Radiometer Irradiance Monitor (ACRIM),
the Solar Spectrum Measurement (SOLSPEC) instrument, the
Measurement of the Solar Constant (SOLCON) experiment, and the
Shuttle Solar Backscatter Ultraviolet (SSBUV) experiment will
benefit from two additional sun observation orbits beyond the
already acquired nominal mission solar measurements. After the
solar orbits, SSBUV and the Atmospheric Trace Molecule Spectroscopy
(ATMOS) instrument are scheduled to make additional atmospheric
measurements during the following six orbits prior to deactivation
for a landing attempt on Saturday morning.
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:6_2_2_44_12_39.TXT
STS-56 Status Report #21
MISSION CONTROL CENTER
Friday, April 16, 1993, 5:30 a.m. CDT
Discovery's landing has been postponed one day because of bad weather at the
Kennedy Space Center landing site. Weather conditions are expected to improve
for a landing tomorrow morning at KSC at approximately 6:40 a.m. central time.
Two alternate opportunities for landing at Edwards AFB in California also look
favorable tomorrow.
The blue team, commander Ken Cameron, pilot Steve Oswald, and mission
specialist Ellen Ochoa, are powering on Shuttle systems and the Spacelab's
atmospheric research equipment for another day of science data taking in orbit.
About 7 p.m., the red team, mission specialists Mike Foale and Ken Cockrell,
will begin powering down and stowing equipment for the return home tomorrow.
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:6_2_2_44_7.TXT
STS-56 Keplerian Elements/State Vector
STS-56 element set GSFC-027a (orbit 135)
STS-56
1 22621U 93 23 A 93106.63589010 0.00053204 00000-0 13021-3 0 277
2 22621 57.0020 139.9839 0008736 142.8313 217.3372 15.95688009 1352
Satellite: STS-56
Catalog number: 22621
Epoch time: 93106.63589010 (16 APR 93 15:15:40.91 UTC)
Element set: GSFC-027a
Inclination: 57.0020 deg
RA of node: 139.9839 deg Space Shuttle Flight STS-56
Eccentricity: 0.0008736 Keplerian Elements
Arg of perigee: 142.8313 deg
Mean anomaly: 217.3372 deg
Mean motion: 15.95688009 rev/day Semi-major Axis: 6664.5302 Km
Decay rate: 0.53E-03 rev/day*2 Apogee Alt: 291.96 Km
Epoch rev: 135 Perigee Alt: 280.32 Km
NOTE - This element set is based on NORAD element set # 027.
The spacecraft has been propagated to the next ascending
node, and the orbit number has been adjusted to bring it
into agreement with the NASA numbering convention.
R.A. Parise, Goddard Space Flight Center
G.L.CARMAN
STS-56 FLIGHT DAY 7 STATE VECTOR (ACTUAL)
ON ORBIT OPERATIONS
(Posted 04/14/93 by Bruce Williamson)
The following vector for the flight of STS-56 is provided by NASA Johnson
Space Center Flight Design and Dynamics Division for use in ground track
plotting programs. The vector is valid for flight day seven. The vector
represents the trajectory of Discovery during the coasting phase of the
flight, and should be reasonably valid for the remainder of the flight.
Additional vectors will be posted, if necessary.
Lift off Time : 1993/098/05:28:59.950
Lift off Date : 04/08/93
Vector Time (GMT) : 104/21:28:59.950
Vector Time (MET) : 006/16:00:00.000
Orbit Count : 107
Weight : 220522.0 LBS
Drag Coefficient : 2.00
Drag Area : 2000.0 SQ FT
M50 Elements Keplerian Elements
----------------------- --------------------------
X = -6074447.0 FT A = 3598.6745 NM
Y = -10211393.3 FT E = 0.0004418
Z = 18366861.8 FT I (M50) = 57.11517 DEG
Xdot = 21487.398065 FT/S Wp (M50) = 292.64218 DEG
Ydot = -13467.827958 FT/S RAAN (M50) = 147.37176 DEG
Zdot = -376.268945 FT/S / N (True) = 158.37943 DEG
Anomalies \ M (Mean) = 158.36077 DEG
Ha = 160.27061 NM
Hp = 156.22608 NM
Mean of 1950 (M50) : Inertial, right-handed Cartesian system whose
Coordinate System origin is the center of the earth. The epoch
is the beginning of the Besselian year 1950.
X axis: Mean vernal equinox of epoch
Z axis: Earth's mean rotational axis of epoch
Y axis: Completes right-hand system
A: Semi-major axis
E: Eccentricity N: True anomaly
I: Inclination M: Mean anomaly
Wp: Argument of perigee Ha: Height of apogee
RAAN: Right ascension of ascending node Hp: Height of perigee
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:6_2_2_44_9.TXT
STS-56 TV SKED, REV I
***********************************************************************
NASA SELECT TV SCHEDULE
STS-56/ATLAS-II/SPARTAN-201
4/16/93
REV I
***********************************************************************
NASA Select programming can be accessed through GE Satcom F2R,
transponder 13. The frequency is 3960 MHz with an orbital position
of 72 degrees West Longitude. This is a full transponder service
and will be operational 24 hours a day.
Two hour edited programs of each flight day will be replayed for Hawaii
and Alaska on Galaxy 6, transponder 19, channel 19. The orbital
position is 99 degrees West Longitude, with a frequency of 4080 MHz.
Audio is 6.2 and 6.8 MHz. The programs will begin on launch day and
continue through landing, airing at 11pm Central Time.
This NASA Select television schedule of mission coverage is available
on Comstore, the mission TV schedule computer bulletin board service.
Call 713-483-5817, and follow the prompts to access this service.
* Denotes Change from previous revision
LAUNCH-Thursday, April 8, 1993 KSC 00/00:00 12:29 AM
------------------------ Friday, April 16 -----------------------------
FD 9
134 * MISSION STATUS BRIEFING JSC 08/08:31 09:00 AM
134 * ATLAS SCIENCE BRIEFING MSFC 08/09:01 09:30 AM
(immediately following
Mission Status Briefing)
139 BLUE/RED HANDOVER 08/15:16 03:45 PM
---------------------- Saturday, April 17 ---------------------------
FD 10
147 * DEORBIT BURN 09/05:05 05:34 AM
(not televised)
148 * KSC LANDING KSC 09/06:09 06:38 AM
LANDING REPLAYS KSC TBD TBD
POST LANDING PRESS CONFERENCE KSC TBD TBD
***********************************************************************
DEFINITION OF TERMS
***********************************************************************
CDT: Central Daytight Time
FD: Flight Day
JSC: Johnson Space Center
KSC: Kennedy Space Center
MET: Mission Elapsed Time. The time which begins at the moment
of launch and is read: days/hours:minutes. Launch=00/00:00
OPS: Operations
P/TV: Photographic/Television activity
SPARTAN: Solar Wind Generation Experiment
STS: Space Transportation System
T=: Time equivalent; Used for duration of event.
TBD: To be determined.
TDRE,W: Tracking and Data Relay Satellite, East and West longitudes.
TIG: Terminal Initiation; on-orbit shuttle burn.
VTR: Videotape recorder.
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:6_8_2_5_10.TXT
GALILEO STATUS 3/10/93
PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109.
GALILEO MISSION STATUS
March 10, 1993
The Galileo spacecraft is 81 million kilometers (51 million miles) from
Earth, travelling in its orbit at 29.6 kilometers per second or about 66,000
miles per hour. It is headed out away from the Sun (at almost a million miles
per day), toward its flyby of the asteroid Ida on August 28, 1993 and its
arrival in Jupiter orbit on December 7, 1995.
The spacecraft health and performance continue to be excellent, except
that the high-gain antenna is still only partly deployed. It is transmitting
telemetry at 1200 bits per second over its low-gain antenna.
Galileo's spin rate was increased to 10.5 rpm today to demonstrate the
high spin rate required for probe release (July 1995) and subsequent activities
using the large, 400-newton rocket engine. The spin rate will be returned to
3.15 rpm on Friday.
Yesterday Galileo carried out a trajectory-correction maneuver (about 2.1
meters per second or 4.7 mph) to target it for the Ida encounter.
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:6_8_2_5_11.TXT
Galileo Status 3/12-15/93
GALILEO STATUS REPORT
March 12, 1993
The Galileo Spacecraft is operating normally in the all-spin mode at
10.5 rpm, and is transmitting coded telemetry at 1200 bps (bits/second).
Yesterday, no spacecraft activity was scheduled. Tracking was scheduled
over DSS-14 (Goldstone 70 meter antenna), DSS-42 (Canberra 34 meter antenna)
and DSS-63 (Madrid 70 meter antenna).
Today, March 12, 1993, the spacecraft under stored sequence control is
scheduled to spin down to 2.9 rpm. Tracking is scheduled over DSS-14 and
DSS-63.
Over the weekend, spacecraft activity to map the High Gain Antenna
receive gain pattern is scheduled on Saturday. Tracking is scheduled
over DSS-61 (Madrid 34 meter antenna), DSS-14 and DSS-15 (Goldstone 34 meter
antenna) on Saturday.
GALILEO STATUS REPORT
March 15, 1993
The Galileo Spacecraft is operating normally in the dual-spin mode
and is transmitting uncoded telemetry at 40 bps (bits/second).
Over the weekend, spacecraft activity to map the High Gain Antenna
receive gain pattern was performed on Saturday, as planned. Tracking was
scheduled ver DSS-42 (Canberra 34 meter antenna), DSS-61 (Madrid 34 meter
antenna), DSS-14 (Goldstone 70 meter antenna) and DSS-15 (Goldstone 34 meter
antenna) on Saturday.
Throughout the week ending March 19, 1993, no spacecraft activity is
scheduled. Tracking each day is scheduled over DSS-63 (Madrid 70 meter
antenna).
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:6_8_2_5_12.TXT
GALILEO STATUS 3/30/93
GALILEO: The spacecraft is now en route to Jupiter, scheduled to
go into orbit there on December 7, 1995. Galileo, Ulysses, and
Mars Orbiter are performing a joint radio-science gravity-wave
experiment from March 22 through April 12. Galileo spacecraft
performance and condition are excellent except that the high-gain
antenna is only partly deployed; science and engineering data are
being transmitted via the low-gain antenna. A 2.1-meter-per-
second trajectory-correction maneuver was performed March 9. The
Project is now planning the Jupiter mission and the August 1993
encounter with asteroid Ida assuming dependence on the low-gain
antenna. Galileo was launched October 18, 1989, by Space Shuttle
Atlantis and an IUS, and flew by Venus in 1990 and Earth in 1990
and 1992 for earlier gravity assists and asteroid Gaspra in
October 1991 for scientific observation.
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:6_8_2_5_13.TXT
GALILEO STATUS REPORT April 6, 1993
The Galileo Spacecraft is operating normally in the dual-spin mode and is
transmitting coded telemetry at 40 bps (bits/second).
Yesterday, no spacecraft was scheduled. Tracking was schedule over DSS-14
(Goldstone 70 meter antenna) and DSS-63 (Madrid 70 meter antenna).
Today, April 6, 1993, no spacecraft activity is scheduled. Tracking is
scheduled over DSS-14 and DSS-63.
Tomorrow, real-time commands are scheduled to update a system fault
protection parameter. Also, the LGA (Low Gain Antenna) deploy/retract
mini-sequence is scheduled to be uplinked. Tracking is scheduled over DSS-14
and DSS-63.
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:6_8_2_5_2.TXT
NOTE: This file is too large {15818 bytes} for inclusion in this collection.
The first line of the file:
1989 GALILEO STATUS REPORTS
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:6_8_2_5_3.TXT
NOTE: This file is too large {56401 bytes} for inclusion in this collection.
The first line of the file:
1990 GALILEO MISSION STATUS REPORTS
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:6_8_2_5_4.TXT
NOTE: This file is too large {60147 bytes} for inclusion in this collection.
The first line of the file:
1991 GALILEO MISSION STATUS REPORTS JAN-AUG
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:6_8_2_5_5.TXT
NOTE: This file is too large {222974 bytes} for inclusion in this collection.
The first line of the file:
1992 Galileo Status Reports
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:6_8_2_5_6.TXT
NOTE: This file is too large {18428 bytes} for inclusion in this collection.
The first line of the file:
GALILEO STATUS REPORT
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GALILEO STATUS REPORT January 27,1993
Jet Propulsion Laboratory
The spacecraft is now en route to Jupiter, scheduled to go into orbit there on
December 7, 1995. It completed its second Earth gravity assist on December 8,
picking up the last increment of velocity for the Jupiter flight. Spacecraft
performance and condition are excellent except that the high-gain antenna is
only partly deployed; science and engineering data are being transmitted via
the low-gain antenna. An operation intended to free the high-gain antenna by
pulsing the antenna-deployment motors began in late December and concluded
January 19 without success. The Project will now focus on completing the
Jupiter mission using the low-gain antenna. Galileo was launched October 18,
1989, by Space Shuttle Atlantis and an IUS, and flew by Venus and Earth in 1990
for earlier gravity assists.
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GALILEO STATUS 2/5/93 - 2/17/93
GALILEO
MISSION DIRECTOR STATUS REPORT
POST-LAUNCH
February 5 - 11, 1993
SPACECRAFT
1. On February 5, the EE-12B (Earth-Earth) prime sequence memory load was
uplinked to the spacecraft without incident. This sequence covers spacecraft
activities from February 8, 1993 to April 12, 1993.
2. On February 8, real-time commands were sent to modify the system fault
protection such that if spacecraft safing executes, the Plasma Wave Subsystem
(PWS) supplemental heater will be turned on. This change was necessitated by
the increasing solar AU distances.
3. On February 8, a periodic RPM (Retro-Propulsion Module) 10-Newton thruster
maintenance activity was performed; all 12 thrusters were "flushed" during the
activity. Spacecraft activity throughout the period was normal.
4. On February 8, the spacecraft performed a 31.5 degree SITURN for the
purpose of attitude maintenance. The Z thrusters were used during the
activity. After the SITURN completed, the Near Infrared Mapping Spectrometer
(NIMS) shield temperature increased to 51.8 degrees C which was 1.8 degrees C
above the 3-210 non-operating limit. A waiver was generated and approved by
the Project for a non-operating temperature limit to 55 degrees C.
5. On February 8, an Ultra-Stable Oscillator (USO) test was performed to
verify the health status of the USO and to collect gravitational red shift
experiment data; long term trend analysis is continuing.
6. On February 8, cruise science Memory Readouts (MROs) were performed for
the Extreme Ultraviolet Spectrometer (EUV), Dust Detector (DDS), and
Magnetometer (MAG) instruments. Preliminary analysis indicates the data
was received properly.
7. During the period from February 10 through February 11, a navigation cycle
was performed. This navigation cycle provided near-continuous acquisition of
two-way doppler and ranging data during four consecutive passes of the
spacecraft over DSS-43 (Canberra 70 meter antenna), DSS-63 (Madrid 70 meter
antenna), DSS-14 (Goldstone 70 meter antenna), and then back to DSS-43.
8. On February 10, real-time commands were sent to turn the Ultraviolet
Spectrometer (UVS) on to exercise its grating drive mechanism and the
instrument remains on. The UVS high voltage was also commanded off to
properly configure the instrument for the Earth-Jupiter cruise phase.
9. On February 10, real-time commands were sent to modify the System Fault
Protection (SFP). Specifically, the Relay/JOI (Jupiter Orbit Insertion)
System Fault Protection (SFP) was patched for use during non-critical spin-up
activities. During commanding, radiation terminated due to bit verify errors.
Remaining command radiation was resumed without incident. Analysis of this
anomaly is in progress.
10. The AC/DC bus imbalance measurements have not exhibited significant change
(greater than 25 DN) throughout this period. The AC measurement reads 19DN
(4.3 volts). The DC measurement reads 146DN (17.2 volts). These measurements
are consistent with the model developed by the AC/DC special anomaly team.
11. The Spacecraft status as of February 11, 1993, is as follows:
a) System Power Margin - 70 watts
b) Spin Configuration - Dual-Spin
c) Spin Rate/Sensor - 3.15rpm/Star Scanner
d) Spacecraft Attitude is approximately 16 degrees
off-sun (leading) and 7 degrees off-earth (leading)
e) Downlink telemetry rate/antenna- 1200bps(coded)/LGA-1
f) General Thermal Control - all temperatures within
acceptable range
g) RPM Tank Pressures - all within acceptable range
h) Orbiter Science- Instruments powered on are the PWS,
EUV, UVS, EPD, MAG, HIC, and DDS
i) Probe/RRH - powered off, temperatures within
acceptable range
j) CMD Loss Timer Setting - 240 hours
Time To Initiation - 212 hours
UPLINK GENERATION/COMMAND REVIEW AND APPROVAL:
1. The LGA-2 (Low Gain Antenna #2) Swing Test sequence memory load was
approved for generation by the Project on February 8, 1993. This sequence
includes Low Gain Antenna (LGA)-2 deploy/retract activities on
February 17, 1993, and wobble identification activities on February 25-26,
1993.
TRAJECTORY
As of noon Thursday, February 11, 1993, the Galileo Spacecraft trajectory
status was as follows:
Distance from Earth 48,015,000 km (0.32 AU)
Distance from Sun 192,745,800 km (1.29 AU)
Heliocentric Speed 119,100 km per hour
Distance from Jupiter 673,957,200 km
Round Trip Light Time 5 minutes, 22 seconds
SPECIAL TOPIC
1. As of February 11, 1993, a total of 65027 real-time commands have been
transmitted to Galileo since Launch. Of these, 59952 were initiated in the
sequence design process and 5075 initiated in the real-time command process.
In the past week, 50 real time commands were transmitted: 50 were initiated in
the sequence design process and none initiated in the real time command
process. Major command activities included commands to uplink the EE-12B
prime sequence memory load, modify system fault protection, turn the UVS
instrument on, and turn the UVS high voltage off.
GALILEO STATUS REPORT
February 17, 1993
The Galileo Spacecraft is operating normally in the dual-spin mode
and is transmitting coded telemetry at 1200 bps (bits/second).
Yesterday, transmission of the LGA-2 (Low Gain Antenna #2) swing
mini-sequence was uplinked. No other spacecraft activity was scheduled.
Tracking was scheduled over DSS-43 (Canberra 70 meter antenna) and
DSS-14 (Goldstone 70 meter antenna).
Today, February 17, 1993, LGA-2 deployment/retraction was accomplished
as planned. Tracking is scheduled over DSS-14, DSS-43 and DSS-63 (Madrid
70 meter antenna).
Tomorrow, the AACS (Attitude and Articulation Control Subsystem) flight
software patch is scheduled to be uplinked. Tracking is scheduled
over DSS-14, DSS-43 and DSS-63.
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GALILEO MISSION STATUS REPORTS 2/24/93 thru 3/04/93
GALILEO STATUS REPORT
February 24, 1993
The Galileo Spacecraft is operating normally in the dual-spin mode and is
transmitting uncoded telemetry at 40 bps (bits/second).
Yesterday, no spacecraft activity was scheduled. Tracking was scheduled over
DSS-63 (Madrid 70 meter antenna) and DSS-14 (Goldstone 70 meter antenna).
Today, February 24, 1993, real-time commands are scheduled to perform a scan
actuator subassembly friction test. Tracking is scheduled over DSS-14, DSS-42
(Canberra 34 meter antenna) and DSS-63.
Tomorrow, a wobble identification is scheduled. Tracking is scheduled over
DSS-63.
GALILEO STATUS REPORT
March 1, 1993
The Galileo Spacecraft is operating normally in the dual-spin mode and is
transmitting coded telemetry at 1200 bps (bits/second).
Over the weekend, no spacecraft activity or tracking was scheduled.
Today, March 1, 1993, a routine RPM (Retro-Propulsion Module) 10-Newton
thruster flushing maintanence activity, SITURN, USO (Ultra Stable Oscillator)
test and cruise science memory readouts are scheduled. Additionally, the AACS
(Attitude and Articulation Control Subsystem) cone controller update
mini-sequence is scheduled to be uplinked. Tracking is scheduled over DSS-63
(Madrid 70 meter antenna) and DSS-14 (Goldstone 70 meter antenna).
Tomorrow, the downlink telemetry rate is scheduled to change to 40 bps
uncoded. Tracking is scheduled over DSS-14.
GALILEO STATUS REPORT
March 2, 1993
The Galileo Spacecraft is operating normally in the dual-spin mode and is
transmitting uncoded telemetry at 40 bps (bits/second).
Yesterday, a routine RPM (Retro-Propulsion Module) 10-Newton thruster
flushing maintanence activity, SITURN, USO (Ultra Stable Oscillator) test and
cruise science memory readouts were performed, as scheduled. Additionally, the
AACS (Attitude and Articulation Control Subsystem) cone controller update
mini-sequence was uplinked. Tracking was scheduled over DSS-63 (Madrid 70
meter antenna) and DSS-14 (Goldstone 70 meter antenna).
Today, March 2, 1993, the downlink telemetry rate was changed to 40 bps
uncoded. Tracking was performed over DSS-14.
Tomorrow, the downlink telemetry rate is scheduled to change to 1200 bps
coded. Real-time commands are scheduled to update the AACS cone controller and
spin detector parameters. Tracking is scheduled over DSS-63.
GALILEO STATUS REPORT
March 3, 1993
The Galileo Spacecraft is operating normally in the dual-spin mode and is
transmitting uncoded telemetry at 40 bps (bits/second).
Yesterday, the downlink telemetry rate was changed to 40 bps uncoded.
Tracking was performed over DSS-14 (Goldstone 70 meter antenna).
Today, March 3, 1993, the downlink telemetry rate is scheduled to be
changed to 1200 bps coded. Real-time commands are scheduled to update the AACS
(Attitude and Articulation Control Subsystem) cone controller and spin detector
parameters. Tracking is scheduled over DSS-63 (Madrid 70 meter antenna).
Tomorrow, real-time commands are scheduled to turn on the RTG boom heaters
and to enable their temperature control monitors. The EPD (Energetic Particle
Detector) shade retraction and motor maintanence exercise, telecommunications
test, and cruise science memory readouts are also scheduled. Tracking is
scheduled over DSS-63.
GALILEO
MISSION DIRECTOR STATUS REPORT
POST-LAUNCH
February 25 - March 4, 1993
SPACECRAFT
1. On March 1, a periodic RPM (Retro-Propulsion Module) 10-Newton thruster
maintenance activity was performed; all 12 thrusters were flushed during the
activity. There was a small change in velocity caused by imbalances in the
firings of the S-thrusters. This effect was first noticed during the RPM
thruster flushing activity on February 8, 1993.
2. On March 1, a SITURN was scheduled in the EE-12B (Earth-Earth #12B) prime
sequence. The purpose of the SITURN was to ensure the spacecraft was at the
EE-12B prime attitude after the close of the spacecraft contingency window.
3. On March 1, the Attitude and Articulation Control Subsystem (AACS) cone
controller parameter update mini-sequence was uplinked to the spacecraft
without incident. This sequence which executed on March 3 verified the cone
controller performance with the current gains, updated the cone controller
gains, verified the cone controller performance with the updated gains, and
updated spin detector parameters.
4. On March 2, an Ultra-Stable Oscillator (USO) test was performed to verify
the health status of the USO and to collect gravitational red shift experiment
data; long term trend analysis is continuing.
5. On March 2, cruise science Memory Readouts (MROs) were performed for the
Extreme Ultraviolet Spectrometer (EUV), Dust Detector (DDS), and Magnetometer
(MAG) instruments. Preliminary analysis indicates the data was received
properly.
6. On March 3, real-time commands were sent to update the attitude control
subsystem cone controller and spin detector parameters in support of the AACS
mini-sequence uplinked on Monday.
7. On March 4, real-time commands were sent to turn the Radioisotope
Thermoelectric Generator (RTG) boom heaters on and enable their temperature
control monitors in accordance with the Retro-Propulsion Module (RPM) pressure
profile strategy and to prepare for the 10.5 rpm spin up wobble compensation
scheduled for March 10.
8. On March 4, the Energetic Particle Detector (EPD) motor maintenance
exercise was performed which stepped the motor through its eight operating
positions and then returned to the normal position (No. 4). Later the EPD
shade was retracted nominally via the spacecraft stored sequence. Retraction
was confirmed via EPD detector temperature telemetry.
9. On March 4, a command threshold test was performed. Data analysis is in
progress at the writing of this report.
10. On March 4, cruise science Memory Readouts (MROs) were performed for the
Extreme Ultraviolet Spectrometer (EUV). Analysis indicates the data was
received properly.
11. The AC/DC bus imbalance measurements have not exhibited significant change
(greater than 25 DN) throughout this period. The AC measurement reads 19DN
(4.3 volts). The DC measurement reads 141DN (16.6 volts). These measurements
are consistent with the model developed by the AC/DC special anomaly team.
12. The Spacecraft status as of March 4, 1993, is as follows:
a) System Power Margin - 40 watts
b) Spin Configuration - All-Spin
c) Spin Rate/Sensor - 2.88 rpm/Star Scanner
d) Spacecraft Attitude is approximately 3 degrees
off-sun (leading) and 8 degrees off-earth (lagging)
e) Downlink telemetry rate/antenna- 40bps(uncoded)/LGA-1
f) General Thermal Control - all temperatures within
acceptable range
g) RPM Tank Pressures - all within acceptable range
h) Orbiter Science- Instruments powered on are the PWS,
EUV, UVS, EPD, MAG, HIC, and DDS
i) Probe/RRH - powered off, temperatures within
acceptable range
j) CMD Loss Timer Setting - 240 hours
Time To Initiation - 239 hours
GDS (Ground Data Systems):
1. Galileo participated in a re-test of the DSN (Deep Space Network) Version
1.5 GCF (Ground Communications Facility) upgrade data flow test on 3 March. The
purpose of this test was to demonstrate a new Galileo data flow path through
the DSN SFOC Gateway (SG) to the Error Correction and Switching (ECS)
subsystem. The 3 March test exercised telemetry, monitor and tracking data for
Galileo only. The test failed due to blocks of data being dropped between the
SG and the ECS for 134.4 KBPS. The cause of this problem is unknown and is
under investigation. Another retest will be performed prior to March 15, 1993.
In addition, Galileo participated in a CMD data flow test on 2 March. The
purpose of this test was to verify the CMD flow through the SG and ECS
interface. This test was canceled at the beginning of the test period due to
the unavailability of the necessary communication resources. A retest of the
CMD data flow will be rescheduled prior to 15 March. The Version 1.5 GCF
upgrade is scheduled to go into operations on 15 March.
2. A MOSO System Test for GLL MGDS V18 Command was performed 2 March from
20:00 to 00:00 GMT using MGDS SIM. The purpose of this test was to exercise the
connectivity of V18 CMD with a simulated DSN station (and CPA). This test was
unsuccessful due to a configuration (setup) problem between the MGDS CMD and
the Project Database (PDB). The configuration problems were resolved on 3
March. Another MOSO System Test of V18 CMD will be performed prior to 8 March.
The System Test Review for V18 CMD is scheduled for 8 March.
TRAJECTORY
As of noon Thursday, March 4, 1993, the Galileo Spacecraft trajectory
status was as follows:
Distance from Earth 72,166,500 km (0.48 AU)
Distance from Sun 220,187,100 km (1.47 AU)
Heliocentric Speed 109,300 km per hour
Distance from Jupiter 624,151,800 km
Round Trip Light Time 8 minutes, 4 seconds
SPECIAL TOPIC
1. As of March 4, 1993, a total of 65099 real-time commands have been
transmitted to Galileo since Launch. Of these, 59993 were initiated in the
sequence design process and 5106 initiated in the real-time command process.
In the past week, 33 real time commands were transmitted: 32 were initiated in
the sequence design process and 1 initiated in the real time command process.
Major command activities included commands to uplink the AACS cone controller
parameter update mini-sequence, update the cone controller and spin detector
parameters, reactivate the HGA unlatch function, and turn the RTG boom heaters
on and enable their temperature control monitors.
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MAGELLAN STATUS 3/22
Magellan Status
Status Report of Magellan for Monday, March 22, 1993:
1. The Magellan spacecraft continues to operate normally, gathering gravity
data in its fourth 243-day cycle of Venus. All starcals over the weekend were
successful. There was a TWTA spurious shut-off earlier this morning, which was
corrected automatically.
2. There was no commanding of the spacecraft since Friday, and none is planned
for today. Tomorrow the high rate gyro biases will be uplinked in the
preparation for the high rate gyro calibration test starting Wednesday.
3. Magellan has operated using low rate gyro biases through most of the
mission to date, so it has not been necessary to calibrate the gyros in high
rate mode. But the aerobraking experiment which will start in late May has a
moderate probability of pushing the attitude control into the range where the
high rate mode is needed.
4. The 24th Lunar and Planetary Science Conference in Houston was attended by
several Magellan scientists who presented technical papers. The Magellan
exhibit was of considerable interest to the conference participants.
5. A memorial session on the Geology of Venus was held on Monday in tribute to
Valery Leonidovich Barsukov, the late director of the V. I. Vernadsky Institute
in Moscow. The session was chaired by J. W. Head and R. S. Saunders.
Academician Basurkov was very active in promoting international cooperation in
planetary exploration and made possible the sharing of Russian data on Venus
exploration.
6. Magellan has completed 7042 orbits of Venus since August 10, 1990.
Magellan is 64 days from the end of Cycle-4.
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MAGELLAN STATUS 3/30/93
MAGELLAN: The Magellan spacecraft is continuing its survey of the
gravitational field of Venus, utilizing precise navigation of the
spacecraft in the near-Venus portion of its elliptical orbit
through May 15, 1993. The science team released final global
maps of Venus's surface topography and various surface properties
at the 24th Lunar and Planetary Science Conference in Houston,
March 15-19. The Project plans to begin maneuvers to circularize
the orbit on May 25. Magellan was launched May 4, 1989, aboard
Space Shuttle Atlantis with an IUS injection stage; it radar-
mapped more than 98% of Venus's surface from September 1990 to
September 1992.
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MAGELLAN STATUS REPORT 4/2/93
Magellan Significant Events for Week Ending 4-2-93
1. The Magellan spacecraft is operating normally in Venus orbit, transmitting
a signal which is used to collect gravity data.
2. Preparations for aerobraking continue to go well. Changes to the on-board
attitude control software were uplinked this week and are being verified by
memory readout.
3. Magellan has completed 7122 orbits of Venus and is now 53 days from the end
of Cycle 4 and the start of the Transition Experiment.
Significant Events for Next Week
1. No special activities as preparations for aerobraking continue on schedule.
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Magellan Significant Events for Week Ending 4-9-93
1. The Magellan mission at Venus continues normally, gathering gravity
data which will be correlated to surface topography. Spacecraft performance is
nominal.
2. Magellan has completed 7173 orbits of Venus and is now 46 days from
the end of Cycle 4 and the start of the Transition Experiment.
3. The Project has completed the current phase of office consolidation
to assist in the collocation of the MESUR Project on the 230-2nd floor.
4. Preparations for aerobraking continue to go well. As presently
planned, the Transition Experiment will begin with a 785-second Orbit Trim
Maneuver (OTM) on May 26, 1993 during orbit #7626 at about 10:40 AM PDT. This
will lower the periapsis from 170 km to 147 km above the surface of Venus.
Magellan Significant Events for Next Week
1. No significant activities are expected next week, as preparation
s
for aerobraking continue on schedule.
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1989 MAGELLAN STATUS REPORTS
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The first line of the file:
1990 MAGELLAN STATUS REPORTS
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The first line of the file:
1991 MAGELLAN STATUS REPORTS JAN-AUGUST
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1992 Magellan Status Reports
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1993 Magellan Status Reports (Jan-Feb)
MGN STATUS 1/04
Magellan Status
Status Report of Magellan for Monday, January 4, 1993:
1. The Magellan spacecraft continues to operate normally, performing a
desat in each 3-hour orbit, a starcal on every other orbit, and
transmitting a carrier signal (plus X-band telemetry) which is
precisely tracked by the DSN stations to extract gravity data.
2. The spacecraft is about halfway through a 4-week command sequence
which allowed control of the mission through the holiday period.
3. Air conditioning and power was lost at the Denver Mission Support
Area over this past weekend, so the display terminals were shut down.
Magellan continued to be tracked by the DSN stations, and telemetry on
the status of the spacecraft was monitored and maintained on the
Central Database at JPL.
4. A check of critical data this morning revealed that the Star Data
Invalid Counter had incremented by only three, indicating good
starcals and attitude control. Another triple spurious shutoff of the
TWTA occurred this morning, but this has become routine.
Telecommunications are satisfactory, with X-band telemetry at 1200
bps.
5. The spacecraft has completed 6470 orbits of Venus; 834 so far in
Cycle-4, which will end on May 25, 1993. The midway point of Cycle-4
will be on January 19.
MGN STATUS 1/18
Magellan Status
Status Report of Magellan for Monday, January 18, 1993:
1. The Magellan spacecraft continues to operate normally.
2. All starcals and desats over the weekend were successful, with two partial
scans.
3. The TWTA experienced another spurious shutoff which was corrected
automatically. A memory readout was commanded early this morning to determine
the time of the TWTA SSO. No further commanding is scheduled for today.
4. The Magellan Project continues a systematic process of archiving its
scientific data products and other records. The radar images,
altimetry/radiometry, and gravity data represents a data set many times the
volume of all previous planetary missions, but the process of distributing this
data to the science community has gone extremely well.
MGN STATUS 1/22
Magellan Status
Status Report of Magellan for Friday, January 22, 1993:
1. The Magellan spacecraft continues to operate normally, transmitting
a carrier signal plus 1200 bps X-band telemetry. All temperatures are
in the expected range.
2. Dr. Steve Saunders described the Magellan Venus Mapping Mission at
the Third Spaceborne Imaging Radar Symposium at JPL on Monday, 1-18-93.
3. The Magellan results were featured in the current issue of National
Geographic magazine in a beautifully illustrated article titled "Venus
Revealed."
MGN STATUS 1/25
Magellan Status
Status Report of Magellan for Monday, January 25, 1993:
1. The Magellan spacecraft continues to operate normally.
2. Magellan has completed 6736 orbits; 1100 so far in Cycle-4 which
will end on May 25, 1993.
MAGELLAN STATUS REPORT January 27,1993
Jet Propulsion Laboratory
The Magellan spacecraft is continuing its survey of the gravitational field of
Venus, utilizing precise navigation of the spacecraft in the near-Venus portion
of its orbit through May 15, 1992. Magellan was launched May 4, 1989, aboard
Space Shuttle Atlantis with an IUS injection stage.
MGN STATUS 1/29/93
Magellan Status
Status Report of Magellan for Friday, January 29, 1993:
1. It was another quiet week for the Magellan spacecraft as it continues to
operate normally transmitting a carrier signal plus 1200 bps X-band telemetry.
All temperatures are in the expected range.
2. The spacecraft has completed 6655 orbits of Venus and is now 55% complete
on its gravity data collection in Cycle-4.
3. Dr. Steve Saunders gave a presentation on the results of the magellan Venus
Mapping Mission at NASA Headquarters on Wednesday, January 27. It will be
aired on NASA Select at a later date.
4. The Project continues its systematic archiving of science data. A complete
validated catalog of data from the first 243-day mapping cycle has been
delivered to the Planetary Data System Central Node at JPL and to the PDS
Geosciences Node at Washington University.
MGN STATUS 2/1
Magellan Status
Status Report of Magellan for Monday, February 1, 1993:
1. The Magellan spacecraft is continuing to operate satisfactorily, collecting
gravity science data and performing normal housekeeping activities such as
momentum wheel desaturations and star calibration scans. The spacecraft
continues to provide engineering telemetry at 1200 bps on the X-band downlink.
2. On 2-2-93, the hydrazine propellant tank will be repressurized which will
allow the performance of the thrusters to be restored to nominal levels.
3. Magellan has completed 6,788 orbits.
4. Dr. Steve Saunders, the Magellan Project Scientist, presented a Magellan
summary to an enthusiastic audience of about 300 at the University of Wisconsin
Geology department on Friday, 1/26/93.
5. An IMAX segment is being filmed in the Magellan science area which
recreates the retrieval of the first data.
MGN STATUS 2/5
Magellan Status
Status Report of Magellan for Friday, February 5, 1993:
1. The magellan spacecraft continues to operate normally, transmitting a
carrier signal plus 1200 bps X-band telemetry.
2. On Tuesday the hydrazine tank of the propulsion system was repressurized in
preparation for the orbit trim maneuvers which will be performed as part of the
aerobraking experiment starting in late May.
3. The spacecraft has completed 6707 orbits of Venus and is now 58% complete
on its gravity data collection in Cycle-4. We are now 108 days away from the
start of the Transition Experiment.
MGN STATUS 2/8
MAGELLAN STATUS
Status report of Magellan for Monday, February 8, 1993:
1. The Magellan spacecraft continues to operate normally, transmitting a
carrier signal plus 1200 bps X-band telemetry.
2. The spacecraft has completed 6727 orbits of Venus and is now 58% complete
on its gravity data collection in Cycle-4. We are now 105 days away from the
start of the Transition Experiment.
3. The Radar Sensor Test Bed has been moved to Bldg. 198 and the space
reconfigured for the Data Management Team. These steps are in preparation for
releasing approximately 1400 Sq. ft. of 230-2nd floor to the new RRapid
Protyping Test Bed.S
MGN STATUS 2/12
Magellan Status
Status Report of Magellan for Friday, February 12, 1993:
1. The Magellan spacecraft continues to operate normally, transmitting a
carrier signal plus 1200 bps X-band telemetry.
2. The TWTA experienced another spurious shut-off Thursday, which was
corrected automatically. A memory readout was commanded to determine the time
of the TWTA SSO.
3. The G3034 command sequence was uplinked late Thursday and began execution
at 11:15 AM PST on Friday. It is a 4-week sequence similar to the past several
loads.
4. The Magellan Project continues a systematic process condensing its
operations and preparing for the Lean Mean Gravity Team phase of the mission.
Approximately 1400 sq. ft. of the MGN MSA has been vacated to provide space for
the Rapid Prototyping Test Bed.
5. The spacecraft has completed 6760 orbits of Venus and is now 61% complete
on its gravity data collection in Cycle-4.
MGN STATUS 2/15
Magellan Status
Status Report of Magellan for Monday, February 15, 1993:
1. The Magellan spacecraft continues to operate normally under the G3034
command sequence. All starcals and desats over the weekend were successful.
The spacecraft experienced a triple TWTA SSO on Friday, but recovered
automatically as in all recent events.
2. Bay 7 (which contains the CDS) is at 43 deg. C. with a cycle depth of 4.5
deg. Other spacecraft temperatures are also in the expected range.
3. Magellan has completed 6781 orbits of Venus since August 10, 1990. The
spacecraft has traveled about 222 million kilometers (139 million miles) in its
orbital path around Venus, in addition to the 400 million kilometers it
traveled getting from Earth to Venus.
4. The Magellan Project continues a systematic process condensing its
operations and preparing for the Lean Mean Gravity Team (LMGT) phase of the
mission. Plans for housing the LMGT in the 230-260 (Science) area were
presented at the Mission DirectorUs meeting on February 9th.
Magellan is 99 days from the end of Cycle 4.
MGN STATUS 2/19
Magellan Status
Status Report of Magellan for Friday, February 19, 1993:
1. The Magellan spacecraft is operating normally under the G3043 command
sequence. Starcals and desats continue to be very successful. Spacecraft
temperatures are in the expected range.
2. A Design Review of the Transition Experiment (TEX) was held in Denver on
Thursday. TEX will begin May 25, 1993, with an OTM to lower the periapsis from
170 to 146 km. This will be followed by a series of small OTMs to "walk in" to
the nominal aerobraking corridor.
3. The aerobraking corridor has been designed to minimize the time required to
achieve a near-circular orbit while keeping below the temperature and dynamic
pressure limits of the spacecraft. The corridor design also has to take into
account the uncertainty and variability of VenusU atmosphere.
4. Periapsis will be kept within this corridor by enabling OTMs during the
aerobraking period, which is expected to take 70-80 days. The preloaded OTM
parameters provide eight variations to orbit corrections, four up and four
down.
5. During TEX the orbit period is continually shrinking, so the spacecraft is
controlled by a looping sequence which contains a series of mini-blocks
separated by pause periods. The length of the pause periods are controlled by
global variables which can be updated by ground command.
6. The preparations for TEX are going well. Engineers and mission planners
are confident that the analyses and design have a high probability of success.
7. A Spacecraft Technical Interchange Meeting was held on Friday in Denver to
review the spacecraft performance since last fall. All activities have gone
very smoothly. There was some discussion of the upcoming high-rate gyro
calibration (March 1993) and the analyses of differences in solar panel output.
Magellan is 95 days from the end of Cycle 4.
MAGELLAN STATUS 2/26
Magellan Status
Status Report of Magellan for Friday, February 26, 1993:
1. The Magellan spacecraft is operating normally under the G3043 command
sequence. Starcals and desats continue to be very successful. Spacecraft
temperatures are in the expected range.
2. During the tracking pass over the Canberra DSN station Thursday morning,
the Magellan telemetry signal was suddenly lost. The station personnel
reported an increased receiver temperature and speculated that it looked like
the uplink was bouncing off the moon. A quick check by Eileen Dukes of the
Spacecraft Team, using a planetary ephemeris program on her personal computer,
verified that the moon had indeed occulted Venus and the Magellan signal.
3. The Magellan Project has been requested to work with the MESUR Project in
finding facility space on the second floor of Bldg. 230 to co-locate the MESUR
personnel in the next few months. The Project is working a plan to accommodate
this change with minimal impact to preparations for TEX and LMGT.
4. Magellan has completed 6863 orbits of Venus since August 10, 1990. We are
now 88 days from the end of Cycle-4 and the start of the Transition Experiment.
Magellan is 88 days from the end of Cycle 4.
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
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MAGELLAN STATUS 3/1
Magellan Status
Status Report of Magellan for Monday, March 1, 1193:
1. The Magellan spacecraft is operating normally under the G3034 command
sequence.
2. Late last week, controllers uplinked parameters or a new star pair to be
used for the attitude control system. Then on Friday, the spacecraft missed
both stars on a starcal. The limit on the attitude updates was increased, and
this was followed by a series of successful starcals. But when the innovation
bound was reset to 0.07 deg. on Saturday, the next starcal missed both stars.
The limit is presently widened to 0.3 deg.
3. The Spacecraft Team is analyzing the star calibration parameters to see if
there is some minor error. The swath one starcals produce attitude updates
which average 0.1 deg. This is higher than the normal setting of the
innovation bound. The swath two starcals (which scan the same two stars in the
opposite direction) result in updates which average only 0.01 deg.
4. The antenna pointing remains sufficiently accurate for the gravity data
collection, and there is little danger of triggering the fault protection with
the increased attitude update limit.
5. Bay 7, containing the CDS, is at 41 deg. C. with a 5-deg. cycle depth.
Transmitter B is at 51.2 deg. C.
6. Magellan has completed 6886 orbits of Venus since August 10, 1990.
Magellan is 85 days from the end of Cycle 4.
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
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MGN STATUS 3/12-15, 1993
Magellan Status
Status Report of Magellan for Friday, March 12, 1993:
1. The Magellan spacecraft is operating normally, as it approaches its 7000th
orbit of Venus next Tuesday. (For those of you who have access to orbit numbers
and are confused by the difference between the current orbit number and this
count, remember that the first orbit after Venus Orbit insertion was 100 and an
adjustment during the in-orbit-check-out added another 11.)
2. The swath one starcals continue to produce attitude updates which average
0.1 deg. This is higher than the normal setting of the innovation bound. The
swath two starcals (which scan the same two stars in the opposite direction)
result in updates which average only 0.01 deg. The limit is presently widened
to 0.2 deg.
3. Yesterday spacecraft controllers uplinked the G3071 command sequence which
will control the spacecraft for the next four weeks. It went active at 9:33 AM
PST today and is very similar to the last several command sequences.
4. The spacecraft performs a reaction wheel desaturation on every orbit, a
starcal on every other orbit. The High Gain Antenna is kept pointed toward
Earth (except during the starcal) in order to acquire gravity data, especially
around periapsis. Engineering telemetry is being received at 1200 bps.
5. The Magellan Project continues to implement the plan with the MESUR
Pre-project to collocate 50 MESUR members on the second floor of Bldg. 230,
with minimal impact to MGN preparations for TEX and LMGT. Several MGN team
members have moved this week, and the remaining moves will be complete by March
31st.
6. Magellan has completed 6989 orbits of Venus since August 10, 1990.
Magellan is 74 days from the end of Cycle-4.
Magellan Status
Status Report of Magellan for Monday, March 15, 1993:
1. The Magellan spacecraft continues to operate normally, gathering gravity
data in its fourth 243-day cycle of Venus.
2. Magellan has completed 7989 orbits of Venus since August 10, 1990.
3. The spacecraft has traveled about 258 million kilometers (160 million
miles) in its orbits around Venus, in addition to the 400 million kilometers
(248 million miles) it traveled getting from Earth to Venus.
Magellan is 71 days from the end of Cycle-4.
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
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MAGELLAN STATUS 3/19/93
Magellan Status
Status Report of Magellan for Friday, March 19, 1993:
1. The Magellan spacecraft is operating normally, performing a desat on every
orbit and a starcal every other orbit. The High Gain Antenna is kept pointed
toward Earth (except during the starcal) in order to acquire gravity data,
especially around periapsis. Engineering telemetry is being received at 1200
bps.
2. The Magellan Project continues to implement the plan to collocate 50 MESUR
members on the second floor of Bldg. 230, while minimizing impact to MGN
preparations for TEX and LMGT. About half of the offices being vacated by MGN
team members have been cleared, and the remaining moves will be complete by
March 31st. Significant amounts of excess paper have been eliminated, and
unneeded equipment has been surplused.
3. Several members of the Magellan science team were in Houston, Texas, this
week for the Lunar and Planetary Science Conference. An Exhibit of Magellan
results was presented, as well as technical papers.
4. Magellan completed its 7000 orbit of Venus shortly before midnight (PST) on
Tuesday, We are now 67 days from the end of Cycle-4 and the start of the
Transition Experiment.
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
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