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Operations CXO Status Report

Friday 24 December 1999 10.00am EST

During the last 48 hours Chandra completed an observation of PSR J0822-4300 with HRC-I, observed the center of M-31 with HRC-I, A521 with ACIS-I and passed through the radiation belts with associated ACIS CTI measurements.

The B-side SI Safing software patch was uplinked on 12/21 and completes the process of updating the spacecraft software to protect the focal plane Science Instruments from radiation damage in the event of a safing action or high radiation environment.

Preparations were completed for handling Y2K contingencies. The mission load to be uplinked on 12/31 will run for 3 days performing scheduled science observations. If the load completes without the next load being uplinked (e.g., in the event of a ground system problem resulting in loss of communication), a command sequence will execute to maneuver the spacecraft to a safe long term attitude while communication from the ground is restored.

During the next week Chandra will follow this observing schedule:

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Alpha-Cen HRC/LETG Dec 24 NGC 1851 HRC/LETG Dec 25 PKS 2155-305 HRC/LETG Radiation Belts Dec 26 NGC 253 ACIS-S PSS 0248+1802 ACIS-S Dec 27 M31 Transient ACIS-I Sigma Gem ACIS-S/LETG Radiation Belts Dec 28 A665 ACIS-I Dec 29 3C 220.1 ACIS-S M82 ACIS-I First J0840+3633 ACIS-S NGC 3227 ACIS-S/HETG Dec 30 V382 Velorum 1999 ACIS-I PKS 0548-322 ACIS-I PKS 0521-365 ACIS-S NGC 1395 ACIS-I Dec 31 Radiation Belts A0620-00 ACIS-S Jan 1 OMC2--3 ACIS-I Q0254-334 ACIS-S Jan 2 Q0135-4001 ACIS-S NGC 1553 ACIS-S Radiation Belts Jan 3

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