Operations CXO Status Report

Friday 4 April 2003 9.00am EST

During the last week the observing schedule was replanned to include an observation of the Gamma Ray Burster H2650 that was accepted as a 1 day turn-around Target Of Opportunity (TOO) on 28 Mar. A portion of the raster scan observation of the NOAO field was rescheduled later in the week. A real-time procedure was completed on Mar 30 to perform a manual unload of momentum using thrusters A-1 (100%), A-2 and A-3. The unload duration was longer than expected for nominal thruster performance and consistent with prior anomalous unloads. A software patch was uplinked to allow collection of high sample rate telemetry of the bus current, and the data are under analysis. The Gyro-1 current in the Inertial Reference Unit (IRU-1) was observed above its yellow limit level (150 mA) during a pass on April 3. The level remained high on the subsequent pass and engineering assessment by the design engineers and vendor is underway.

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Radiation Belts                     Apr 7
NGC 1831               ACIS-S
SN1006 (7 obs)         ACIS-I       Apr 8
Radiation Belts                     Apr 10
SN1006 (4 obs)         ACIS-I
NGC 5746               ACIS-I       Apr 11
SDSS J143030.22-0011   ACIS-S
B2 1553+24             ACIS-S
TXS 1428+370           ACIS-S       Apr 12
B2 1422+26B            ACIS-S
Radiation Belts
Z11598-0112            ACIS-S       Apr 13
2MASS112751+243208     ACIS-S
RX J0007.0+7303        ACIS-S

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All spacecraft subsystems, with the exception of MUPS thruster A-1 as noted above, continued to operate nominally.

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