INDIVIDUAL:Paul J. Pashby
TITLE :Orbiting Satellites Project
WEEK OF :July 14 to July 20, 1994
Operations with the Extreme Ultraviolet Explorer went smoothly during the reporting period; both the spacecraft and payload are functioning very well. Observations of the planet Jupiter began midweek and will continue with a few short interruptions until August 12.
To maintain consistent battery charging levels and profiles, constant current mode at orbital daybreak was disabled and the solar arrays moved to a 20 degree solar offset angle during the past week. Both these steps were mandated by the high antisun and roll angles of the spacecraft needed to observe the Jupiter/comet impact. A change in battery charging efficiency was also commanded to account for the increasing length of EUVE's orbital day. Careful battery management has resulted in consistently good performance from the three batteries. All other subsystems are operating nominally. The current Shuttle mission has not had a negative impact on the SCE or HGA gimbal temperatures, despite EUVE's use of longer TDRS tracks. Testing of UCB-supplied Absolute Time Commands (ATC) continued during the past week. A software bug identified in one of the GSFC ground processing systems should be fixed in the coming week which will allow testing to continue. Regular telecons with Berkeley have been held on this subject.
No new problems or incidents to report.
EUVE will observe the effects of the comet collision on Jupiter's
Io torus throughout much of the next few weeks.