Magellan Status for 05/25/89 (Forwarded)

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Article #5986

#5986

From: Peter E. Yee
Date: Thu, 25 May 1989 22:54

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                         MAGELLAN STATUS
                          May 25, 1989
 
 
     Plans are being made to place in Magellan's Cruise 4 and 5
computer command sequences information to help develop a solution
to the rocket engine module overheating problem. Starting with
Cruise-4, which will be uploaded on June 9, the spacecraft will
be turned 180 degrees around an axis through the medium-gain
antenna (MGA) to collect thermal data in a new attitude.
 
     Also, two new stars will be added to the star calibration
sequence in Cruise-4. The spacecraft will scan the stars of a
different spectral class to assist in adjusting the star-scanner
acceptance criteria and on-board attitude determination. Those
scans will not be updated, however.
 
     The twice daily momentum wheel desaturations and the daily
star calibration were performed routinely Wednesday.
 
     Project has determined the time of day Magellan will reach
its aim point at Venus on August 10, 1990. Without further
trajectory correction it would be 10:30 a.m. PDT. Another
trajectory correction maneuver scheduled for December, however,
will skew that time by several minutes.
 
 
 
 
 
 
     SPACECRAFT
     Distance From Earth (mi)                   3,056,363 
     
     Velocity  Geocentric                         5,706 mph
               Heliocentric                      60,169 mph
 
     One Way Light Time                           15.2 sec

Technical Details

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!ames!trident.arc.nasa.gov!yee
From: yee@trident.arc.nasa.gov (Peter E. Yee)
Newsgroups: sci.space.shuttle
Subject: Magellan Status for 05/25/89 (Forwarded)
Message-ID: <25888@ames.arc.nasa.gov>
Date: 25 May 89 22:54:30 GMT
Sender: usenet@ames.arc.nasa.gov
Reply-To: yee@trident.arc.nasa.gov (Peter E. Yee)
Organization: NASA Ames Research Center, Moffett Field, CA
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