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Operations CXO Status Report

Friday 19 January 2007 8.30am EST

During the last week Chandra completed the observing schedule as planned.

A real-time procedure was run on 16 Jan to raise the Aspect Camera Assembly (ACA) CCD temperature from -20 deg C back to -19 deg C. This step was taken after monitoring of the CCD temperature following the decrease to -20 deg C on 26 Dec indicated that the new temperature provided insufficient control margin of the CCD Thermal Electric Cooler (TEC). The performance of the CCD is expected to be acceptable at -19 deg C. Note that contrary to last week's report, the ACA dark current calibration conducted on a 5 Jan indicated the expected decrease (not increase) in warm pixels due to the lowering of the CCD temperature.

A Chandra image release was issued on 9 Jan of the Kepler Supernova Remnant. The spectacular image was acquired over 750Ks and the data indicate that Kepler could be the nearest example of a relatively rare "prompt" Type Ia explosion, which occur in more massive progenitors only about 100 million years after the star formed rather than several billion years. For details see: http://chandra.harvard.edu/photo/2007/kepler/

The schedule of targets for next week is shown below.

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Radiation Belts Jan 21 GRB 061121 ACIS-S Jan 22 NGC 1893 ACIS-I Cyg X-2 HRC-I Jan 24 HCG 100 ACIS-I Radiation Belts PKS0745-191 ACIS-I PKS 1055+201 ACIS-S Jan 25 Radiation Belts Jan 27 PKS 1055+201 ACIS-S HE1113-0641 ACIS-S Jan 28 1RXS J171824.2-40293 HRC-S ZwCl1742 HRC-I

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All spacecraft subsystems continued to support nominal operations.

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