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Operations CXO Status Report

Friday 8 March 2012 9.00am EST

During the last week the observing schedule was interrupted by a high-radiation event that activated the science instrument safing sequence (SCS 107) and stopped observing at 00:29am EST on Mar 7. All spacecraft actions were nominal. Real-time procedures were executed on Mar 7 to disable SCS-29, which was enabled during the safing sequence, and to update the observation identifier number, to aid CXCDS processing of the interrupted observation. Observations that were impacted will be rescheduled.

A flight software patch was uplinked on Mar 2 to update the on-board gyro calibration misalignment matrix. Real-time procedures were executed on Mar 3 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. A real-time procedure was executed on Mar 7 to perform a routine self-check of the Electrical Interface Assembly (EIA) Sequencer.

A Chandra press release was issued on Mar 2 as a NASA press release describing multi-telescope observations of Abell 520, colliding galaxy clusters. Astronomers used Chandra, Hubble, and the Subaru and Canada-France-Hawaii telescopes to observe Abell 520, which is 2.4 billion light years away. A clump of dark matter has apparently been left behind after a violent collision of galaxy clusters. This dark matter clump contains far fewer galaxies than would be expected if the dark matter and galaxies hung together. For details see:

The schedule of targets for the next week is still in development and subject to the on-going effects of heightened Solar activity.

All spacecraft subsystems continued to support nominal operations.

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