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Operations CXO Status Report

Friday 2 December 2011 9.00am EST

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

A real-time procedure was executed on Nov 27 to update the on-board ephemeris.

A real-time procedure was executed on Dec 1 to patch the flight software to modify the on-board response to high-radiation. The patch modifies the CCDM subsystem part of the flight software to provide a configuration where the "observing" commanding (e.g. selecting and configuring the science instruments) and "vehicle" commanding (e.g. maneuvers, eclipse handling, momentum unloads) are contained in different mission SCSs. With this "split" load, the safing subsystem response to high radiation is such that "observing" commanding ceases when the science instruments are safed. The "vehicle" commanding continues after a high radiation safing event. The safing subsystem response to conditions other than high radiation remains unchanged. In conjunction with the flight software patch a new version of the Off-Line System (OFLS) ground software was promoted for operational use. Version 11.8.5 includes the modifications required for generating the "vehicle" and "observing" command-load pairs required by the flight software. Command loads produced by the new OFLS version that complete the week's planned observing schedule were uplinked following the patch uplink. Additional real-time procedures were executed on Dec 1 to dump OBC-A memory as a follow-up to the patch. The dump will be used to update the baseline memory image maintained on the ground.

The schedule of targets for the next week is shown below and includes observations of NGC 2264 coordinated with Spitzer.

ARP151                 ACIS-S       Dec  4
         A1914_Field3           ACIS-I
         M87                    ACIS-S
         NGC2264                ACIS-I       Dec  5
         ZetaOrionis            ACIS-S/HETG  Dec  6
         ACTJ0232-5257          ACIS-I
         Radiation Belts
         NGC4388                ACIS-S       Dec  7
         NGC2264                ACIS-I
         SDSSJ0904+1309         ACIS-S       Dec  8
         NGC2264                ACIS-I
         SPT-CLJ0441-4854       ACIS-I
         Radiation Belts                     Dec  9
         SPT-CLJ0441-4854       ACIS-I
         ZetaOrionis            ACIS-S/HETG
         SPT-CLJ0441-4854       ACIS-I       Dec 10
         ZetaOrionis            ACIS-S/HETG
         SDSSJ0841+0312         ACIS-S       Dec 11
         M31                    HRC-I
         SDSSJ1032+0541         ACIS-S
         NGC4748                ACIS-S


All spacecraft subsystems continued to support nominal operations.

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