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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.

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


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

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