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Operations CXO Status Report

Friday 20 July 2007 9.00am EDT

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

Chandra passed through the final eclipse of the 2007 Summer season on July 12 with nominal power and thermal performance. A real-time procedure was conducted on July 13 set the short eclipse flag to 'false'. A second real-time procedure was executed on July 13 to clear a glitch counter that incremented during eclipse exit. The counter increment is expected under certain timing and thermal conditions.

A commanding anomaly was observed on July 15 when the the first block of commands sent during a pass to turn on the downlink signal was resent autonomously by DSN station DSS-46. There were no impacts from the duplicate commanding however we are working closely with DSN to understand the cause of the anomaly.

The targets recommended for acceptance from the Cycle-9 Peer review were posted on schedule on July 13. For details see: http://cxc.harvard.edu/target_lists/

The schedule of targets for the next week is shown below and includes an observation of PSR B1259-63 coordinated with VLBI observations.

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Radiation Belts Jul 23 NGC 6826 ACIS-S Vega (4 obs) HRC-S Jul 24 Vega HRC-I GC-1 HRC-I GC-2 HRC-I GC-4 HRC-I GC-5 HRC-I GC-6 HRC-I GC-7 HRC-I RXJ1131-1231 ACIS-S SDSS J1212+5341 ACIS-S RXJ 1257+4738 ACIS-S AX J185750+0240 ACIS-S Jul 25 Abell 2395 ACIS-S IC 5325 ACIS-S Radiation Belts 3EG J1826-1302 ACIS-I Jul 26 J1826-14 ACIS-I Jul 27 Abell 2244 ACIS-I Abell 222 ACIS-I Orion Trapezium Cl ACIS-S/HETG PSR B1259-63 ACIS-S/HETG Jul 28 Orion Trapezium Cl ACIS-S/HETG Radiation Belts IRAC Dark Field ACIS-I Jul 29 A1446 ACIS-I

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All spacecraft subsystems continued to support nominal operations.

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