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Operations CXO Status Report

Friday 3 February 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 02:39pm EST on Jan 27. All spacecraft actions were nominal. A real-time procedure was executed on Jan 27 to disable SCS-29, which was enabled during the safing sequence. Observations of NGC3115, PSR J1650-4341, NGC 7662, and 1RXS J170047.8-31444 were impacted and will be rescheduled. Real-time procedures were executed on Jan 29 to verify that the radiation environment as observed by the HRC anticoincidence shield had decreased to an acceptable level and to start a collection of ACIS CCD charge-transfer inefficiency data. Loads for a replanned schedule were uplinked on Jan 29 with 163.4ks of science loss.

A real-time procedure was executed on Feb 1 to perform a routine self-check of the Electrical Interface Assembly (EIA) Sequencer. A second real-time procedure was executed on Feb 2 to update the on-board ephemeris.

A Chandra image release was issued on Feb 1 describing an observation of G350.1-0.3, a young and exceptionally bright supernova remnant about 15,000 light years from Earth. Its unusual shape suggests that the debris from the supernova explosion is expanding into a nearby cloud of cold gas. Astronomers think the star that created G350.1-0.3 exploded between 600 and 1,200 years ago. For details see:

The schedule of targets for the next week is shown below and includes an observation of Parenago523_P1 coordinated with OVRO/CARMA.

Radiation Belts Feb 5 cl1501-0830 ACIS-I SgrA* ACIS-S/HETG Feb 6 J1139.2+0336 ACIS-I IC443 ACIS-S Radiation Belts Feb 8 IC443 ACIS-S A773 ACIS-I Feb 9 SDSSJ1143+0524 ACIS-S SgrA* ACIS-S/HETG SDSSJ1246+2625 ACIS-S Parenago523_P1 ACIS-S Feb 10 SDSSJ1201+0116 ACIS-S SgrA* ACIS-S/HETG SDSSJ1218+1536 ACIS-S Crab ACIS-S SDSSJ085416.76+5026 ACIS-S Radiation Belts 2XMMJ151558.6+56181 ACIS-S Feb 11 SgrA* ACIS-S/HETG 2XMMJ151558.6+56181 ACIS-S CXOJ181335.1-174957 ACIS-S Feb 12 SMCX-1 HRC-I HD187123 ACIS-S Feb 13


All spacecraft subsystems continued to support nominal operations.

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