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Operations CXO Status Report

Friday 7 September 2012 9.00am EDT

During the last week the observing schedule was interrupted due to high radiation associated with solar activity. The loads were halted at 8:57am EDT on Sep 3 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. All spacecraft actions were nominal. A replanned schedule for resuming science observations was uplinked on Sep 4 with 48.0ks of science loss. Planned observations of SDSS J1227+6803 and SDSS J123915.40+5314 were impacted and will be rescheduled.

Chandra passed through the eleventh, twelfth, and thirteenth eclipses of the season on Sep 1, 4, and 6 respectively, with nominal power and thermal performance. A real-time procedure was executed on Sep 4 to dump and clear a glitch counter that incremented during eclipse exit on Aug 27. The counter increment is expected under certain timing and thermal conditions.

A real-time procedure was executed on Sep 5 to perform a routine self-check of the Electrical Interface Assembly (EIA) Sequencer.

The schedule of targets for the next week is shown below and includes an observation of PNV J06393874+0553520, which was accepted as a Director's Discretionary Time TOO on Aug 29.

 Radiation Belts                     Sep  9
         M51                    ACIS-S
         Crab                   ACIS-S       Sep 11
         Radiation Belts                     Sep 12
         PNVJ06393874+055352    ACIS-S/HETG
         M31                    ACIS-I
         M51                    ACIS-S
         Radiation Belts                     Sep 14
         PLCKG266.6-27.3        ACIS-I       Sep 15
         A2667 (2 obs)          ACIS-I
         SPT-CLJ0123-4821       ACIS-I
         SDSSJ014209.01-0050    ACIS-S       Sep 16
         PSRJ0734-1559          ACIS-S
         PLCKG266.6-27.3        ACIS-I


All spacecraft subsystems continued to support nominal operations.

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