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Operations CXO Status Report

Friday 19 April 2002 9.00am EST

Last week the observing schedule was interrupted due to high radiation associated with solar flare activity. The loads were halted on April 17 at 8:55am EDT through a ground command to execute the SI Safing SCS 107. This ensured that the accumulated radiation dose for ACIS remained below the allowed threshold. Loads were rebuilt and uplinked late on March 17, when the radiation environment had reached an acceptable level. The replan included an initial maneuver to avoid an Earth blockage. 39.2 ks of the observation of Field-142549+353248 was impacted by the event.

Of note last week was the upgrade to a new version of the GRETA ground system software and operating system. The new version (1.2.1) supports the new OS and includes a number of enhancements and bug fixes. In addition, a new version of the Off Line System (9.2B) has been approved for operations that will significantly improve the momentum management process during scheduling.

April 18 marked Chandra's 1000th day in orbit!

The observing schedule for the next week is shown below and includes an observation of GX 1+4 coordinated with RXTE.

RCS1325+2858 ACIS-S Apr 22 HS 1229+4807 ACIS-S Radiation Belts Apr 23 NGC2362 ACIS-S/HETG 1145-676 ACIS-S Apr 24 1046-409 ACIS-S Vela Remnant HRC-I FTM1012+2825 ACIS-S SDSS075652+450258 ACIS-S Apr 24 PSS0808+5215 ACIS-S Apr 25 3C 265 ACIS-S Radiation Belts Speedy Mic ACIS-S/HETG Apr 26 GX 1+4 ACIS-S/HETG Speedy Mic ACIS-S/HETG Apr 27 1739-304 ACIS-S GRS 1758-258 HRC-I HS 2251+2941 ACIS-S PKS2201+044 ACIS-S 1655+077 ACIS-S Apr 28


All spacecraft subsystems continued to operate nominally.

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