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Operations CXO Status Report

Friday 2 March 2012 9.00am EST

During the last week the observing schedule was interrupted due to high radiation associated with solar activity. The loads were halted at 10:24pm EST on Feb 26 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 real-time procedure was executed on Feb 27 to disable SCS-29, which was enabled during the safing sequence. An additional real-time procedure was executed on Feb 27 to start a collection of ACIS CCD charge-transfer inefficiency data. A replanned schedule for resuming science observations was uplinked on Feb 27 with 87.8ks of science loss. Planned observations of 4C73.18, G115.71+17.52, J1214.0+2932, HD 188015, G38.7-1.4, and J0232.3-3639 were impacted and will be rescheduled.

A real-time procedure was executed on Mar 2 to update the on-board ephemeris.

The schedule of targets for the next week is shown below and includes an observation of 55 Cnc, which was accepted as a Director's Discretionary Time TOO on Feb 23 and is coordinated with HST, an observation of IGR J18179-1621, which was accepted as a Target of Opportunity on Mar 1, and an observation of RXJ1622.7-2325_P1 coordinated with OVRO/CARMA.

40EriC ACIS-S Mar 4 SDSSJ0901+3549 ACIS-S 3C270.1 ACIS-S Radiation Belts Mar 5 G288.61-37.65 ACIS-I Mar 6 NGC3393 ACIS-S/HETG 55Cnc ACIS-S Mar 7 NGC3393 ACIS-S/HETG SDSSJ1143+3452 ACIS-S Mar 8 HS2237+8154 ACIS-S Radiation Belts NGC3393 ACIS-S/HETG SDSSJ1027+3543 ACIS-S Mar 9 M31 HRC-I ESO399-20 ACIS-S PSRJ1355-6206 ACIS-S RXJ1622.7-2325_P1 ACIS-S SPT-CLJ0014-4952 ACIS-I 1RXSJ170047.8-31444 ACIS-S Mar 10 NGC5080 ACIS-S NSV11919 ACIS-S J084802.2+740546 ACIS-S Mrk423 ACIS-S SDSSJ1503+3641 ACIS-S Radiation Belts Mar 11 IGRJ18179-1621 ACIS-S/HETG SDSSJ1057+4403 ACIS-S 4U2129+47 ACIS-S


All spacecraft subsystems continued to support nominal operations.

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