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Operations CXO Status Report

Friday 19 July 2002 5.00pm EDT

During the last week the observing schedule was interrupted following a high radiation event at 8:32am EDT on Jul 17 that stopped the daily load and activated the science instrument safing sequence (SCS 107). All actions were nominal and radiation levels dropped sufficiently to allow the loads to be restarted at 12.00pm on Jul 18. A total of 87Ks of observing time was impacted by the event and observations of NGC1600, PSS 0008+1923, HS 0017+2116 and Cas A will be rescheduled in a later load.

A real-time procedure was completed nominally on Jul 16 to uplink an update to the on-board gyro scale-factor and alignment matrix. Following the uplink, a series of test maneuvers run from the daily-load were monitored in real-time. The performance of the pointing system with updated values, matched model predictions extremely well.

The observing schedule for the next week is shown below and includes one constrained observation of IM Peg.

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Radiation Belts Jul 22 AX J1511.7+0758 ACIS-S AQL X-1 ACIS-S Lambda And HRC-S/LETG HZ43 HRC-S/LETG Jul 23 HZ43 (2 obs) HRC-I/LETG Lamdba And HRC-S/LETG M87 ACIS-S Jul 24 1343-601 ACIS-S H183611 ACIS-I Radiation Belts IM Peg ACIS-S/HETG Jul 25 WX Hyi ACIS-S/HETG J2310-437 ACIS-S Jul 26 NGC6861 ACIS-I DEM L 316 ACIS-S Radiation Belts Jul 27 NGC 533 ACIS-S WX Hyi ACIS-S/HETG Jul 28

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All spacecraft subsystems continued to operate nominally.

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