baalke@mars.jpl.nasa.gov (Ron Baalke) (12/14/90)
MAGELLAN STATUS REPORT
December 13, 1990
The Magellan spacecraft is in good health and performing nominally. All
seven STARCALS (star calibrations) since yesterday were successful with small
attitude updates.
The spacecraft commanding at present includes updating of reference
values such as the Z axis gyro bias. Tomorrow, however, the M0349 mapping
sequence will be sent up, which is the first of six occulted mapping sequences.
This sequence will shorten the mapping pass by 6.5 minutes in order to
accommodate 46 minutes of earth occultation during the playback.
Spacecraft engineers are meeting today with representatives of Odectics,
the company which built the on-board tape recorder to discuss the probable
causes of the tape recorder A deterioration and options for correcting the
problem.
96.7% of the radar data has been received at Earth. The following
table shows the causes of data losses:
Power outage at Madrid DSN station (10/1) 1.2 orbits
Incorrect attitude update (10/1) 1.5 orbits
DSN delay is setting polarization after
TWTA swap following spurious shutoff 0.3 orbits
Frequency timing outage Canberra (11/13) 1.4 orbits
Loss of Signal #3 (11/15) 3.0 orbits
Power outage at Canberra (11/21) 0.2 orbits
Tweak Commanding anomaly (11/23) 4.0 orbits
Incorrect attitude update (12/1) 4.5 orbits
Miscellaneous DSN lockup delays, etc. 0.4 orbits
TOTAL TO DATE: 16.5 ORBITS
Eight images have been selected for a Magellan Results lithograph set to
be distributed Lab-wide early in 1991. A 10 foot by 12 foot photomural of the
"Crater Farm" Magellan image has been hung on the wall opposite the entrance
to the Smithsonian National Air and Space Museum in Washington, D.C., and a
continuous video presentation which includes the press conference is playing
on the main floor near the Viking display.
___ _____ ___
/_ /| /____/ \ /_ /|
| | | | __ \ /| | | | Ron Baalke | baalke@mars.jpl.nasa.gov
___| | | | |__) |/ | | |___ Jet Propulsion Lab | baalke@jems.jpl.nasa.gov
/___| | | | ___/ | |/__ /| M/S 301-355 |
|_____|/ |_|/ |_____|/ Pasadena, CA 91109 |