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Operations CXO Status Report

Friday 20 December 2002 9.00am EST

During the last week Chandra completed the observing schedule as planned.

During a real-time pass on 19 Dec the ACIS Digital Processing Assembly (DPA-A) was seen in an unexpected powered-off state. Assessment of the real-time telemetry indicated behavior consistent with a similar DPA turn-off in October 2000. In that case fault-tree analysis concluded the event was due to a single event upset. The DPA was powered back on and the required software patches reloaded during a real-time pass at 1am on Dec 20. Since the power-off and power-on occurred within the radiation belt zone, no science was lost due to the event. Further engineering analysis will be performed.

A real-time procedure was completed on Dec 19 to disable an aberration adjustment made in the OBC software. The adjustment has been disabled to accommodate the accuracy requirements of a series of observation of the Crab nebular that will be occulted by Saturn's moon Titan on Jan 5.

Of note last week was the conduct of the Chandra User's Committee meeting on Dec 17-18.

The mission planning team completed work on the 2-week schedule to span the holiday period. The schedule of observations is shown below and includes the occultation observation of Titan.

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MACS-J2243.3-0935 ACIS-I Dec 23 MR2251-178 HRC-S/LETG NGC 1365 ACIS-S Dec 24 MACS-J0329.6-0211 ACIS-I Z03521+0028 ACIS-S Radiation Belts Dec 25 NGC 1265 ACIS-S MACSJ2228.5+2036 ACIS-I Dec 26 3C 438 ACIS-S Dec 27 Radiation Belts Dec 28 A665 ACIS-I 1E0953.8+6918 ACIS-S RCS1620+2929 ACIS-S Dec 28 AX J1532.3+2401 ACIS-S Dec 29 NGC5953 ACIS-S M87 ACIS-S 4U 1145-619 ACIS-S 0506-68.0 ACIS-S Radiation Belts Dec 30 SNR1987A ACIS-S MYCN 18 ACIS-S Dec 31 DEM L50 ACIS-S Jan 1 EIS0954-2023/22 ACIS-S LBSQ1009-0252 ACIS-S PC 1015+4752 ACIS-S 2MASS093844+005716 ACIS-S Radiation Belts Jan 2 3C215 ACIS-S SDSS J141234.68-003500 ACIS-S Jan 3 NGC 5845 ACIS-S GRB021201 ACIS-I NGC2623 ACIS-S MACS-J0744.8+3927 ACIS-I RX J045707.4+452751 ACIS-S Jan 4 RXJ0439.0+0715 ACIS-I Radiation Belts Titan ACIS-S/HETG Jan 5

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All spacecraft subsystems continued to operate nominally.

The next report is planned for January 3 following the holiday. A Happy Holiday and New Year to everyone from the entire Chandra Team!

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