EUVE Status Report
INDIVIDUAL:Paul J. Pashby
TITLE :Orbiting Satellites Project
WEEK :June 30 to July 6, 1994
EXTREME ULTRAVIOLET EXPLORER (EUVE)
EUVE is currently conducting an important pre-comet-impact
observation of the planet Jupiter. All payload and spacecraft
systems are operating well. A gyro recalibration and observations of
M15/AC211 and the star RE2009 are scheduled for later this week.
Performance of the Explorer Platform has been nominal this week.
Procedural changes have been implemented to avoid the section of tape on
recorder B which caused data errors last week. Research on the nature of
the problem is still underway.
Observation of the planet Jupiter this week has required special power
management steps to be taken due to its high antisun location and the
required alignment (spacecraft roll) of the spectrometer with respect to
the Jupiter/Io system. The spacecraft is currently flying with a 20
degree solar array offset with respect to the sun. Additionally, no
transition to constant current mode (CCM) at beginning of orbit day is
being commanded. Transition to our normal 40 degree offset, with CCM at
orbit enabled at orbit dawn will be effected with the observation of M15.
A gyro recalibration consisting of six preplanned slews, and a brief
period of Survey Mode to gather star tracker trend data are planned for
July 8, 9. The first on orbit test of UCB-supplied absolute time commands
of the EUVE payload should also occur later this week. A series of tests
to prove proper operation of the stored commands as well as their
response to inhibit conditions will be performed.
No new problems or incidents to report.
Gyro recalibration and a brief period in Survey Mode for star
tracker trend data collection are planned for July 8-9.