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Operations CXO Status Report
Friday 06 June 2003, 12.30pm EDT
During the last week the observing schedule was restarted at 9.00am on
May 31 following the interruption due to high solar activity (total
94.8 Ks science time impact). On June 2 the loads were replanned to
include an observation of the gamma-ray burster GRB030528 that was
accepted as a Target Of Opportunity (TOO). Observations of SN 2000BG,
A4038, SDSS J000654.11-001533.4 and 4C 74.26 were impacted by the
solar event and TOO and will be rescheduled.
The IRU-1 gyro-1 current remained quiet and near 140 mA during the
last week. A real-time procedure was completed on Jun 6 to turn on the
B-side Inertial Reference Unit (IRU-2). IRU-2 will be operated in
parallel with IRU-1 in order to allow calibration of the gyros
concurrent with on-going operations.
A real-time procedure was completed on Jun 4 to perform a manual
unload of momentum. The unload was performed at an attitude that
ensured a cooler starting temperature than prior anomalous
unloads. Thruster performance was nominal during the unload and
provides further evidence that the thermal environment is related to
the prior anomalous performance.
The observing schedule for next week is shown below and includes and
observation of the TOO GRB030528.
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2MASS012031+2003 ACIS-S Jun 8
1E0953.8+6918 ACIS-S
GRB030528 (TOO) ACIS-S Jun 9
Radiation Belts
1E 1207.4-5209 ACIS-S/LETG Jun 10
Radiation Belts Jun 12
Cetus Field ACIS-I
Radiation Belts Jun 14
Cetus Field ACIS-I Jun 15
BR 0418-5723 ACIS-S
1E 1207.4-5209 ACIS-S
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All spacecraft subsystems, with the exception of the MUPS thruster A-1
under investigation, continued to operate nominally.
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