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Operations CXO Status Report

Friday 14 December 2007 7.00am EST

During a real-time pass on Dec 13 the ACIS Digital Processing Assembly Side-B (DPA-B) was detected in an unexpected powered-off state. Assessment indicated behavior consistent with two prior cases where DPA-A powered-down, in Oct 2000 and Dec 2002. In those cases the power-down was attributed to a spurious command from the SIM RCTU, likely caused by a single event upset. A real-time procedure was successfully executed at 9:45pm on Dec 13 to restart the DPA Side-B and warmboot the ACIS Back End Processor. An observation of AEGIS-1 was impacted by the event.

An aspect camera dark current calibration was performed from the on-board loads on Dec 10. Assessment of the data indicated nominal aspect camera performance and that the number of CCD warm pixels is increasing at the expected rate.

A Chandra image release was issued on Dec 10 of the Whirlpool galaxy (M51). In the composite Chandra and HST image, the Chandra data reveal sources that are black holes and neutron stars in binary star systems, as well as the diffuse glow of hot gas that permeates the space between the stars. For further details see: http://chandra.harvard.edu/photo/2007/m51/

The schedule of targets for the next week is shown below and includes observations of M31 coordinated with XMM-Newton and LP412-31 coordinated with the VLA.

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2A 0335+096 ACIS-S Dec 16 M31 HRC-I Dec 17 S06 ACIS-S Alpha Centauri HRC-I J0722.6-0931 ACIS-I 3C105 ACIS-S J0805+2458 (3C192) ACIS-S AEGIS-1 ACIS-I Dec 18 Radiation Belts AEGIS-1 ACIS-I AP 139 ACIS-S Dec 19 AEGIS-1 ACIS-I J0811.5+0937 ACIS-I Dec 20 2A 0335+096 ACIS-S S32 ACIS-S AEGIS-1 ACIS-I Radiation Belts AEGIS-1 ACIS-I Dec 21 J0831+3219 ACIS-S 3C171 ACIS-S cl0838+1948 ACIS-I Dec 22 AEGIS-1 ACIS-I cl1630+2434 ACIS-I S07 ACIS-S LP412-31 ACIS-S SDSS J083749.59+36 ACIS-S Dec 23 AEGIS-1 ACIS-I

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All spacecraft subsystems continued to support nominal operations.

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