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Operations CXO Status Report

Friday 15 November 2002 7.00am EST

During the last week the observing schedule was interrupted following a high radiation event at 10:20pm EST on Nov 9 that stopped the daily load and activated the science instrument safing sequence (SCS 107). All actions were nominal and radiation levels dropped sufficiently to allow the loads to be restarted at 4:54 am on Nov 11. Observations of 0156-252, 0406-244 and MACSJ2049.9-3217 (total 54.5 Ks) were impacted by the event and will be rescheduled in a later load.

Last week a combined Level 2 and Flight Director Board approved a reduction of the aspect camera bright Earth limitation from 20 to 10 degrees. The change was approved following the completion of a series of engineering tests and will improve scheduling flexibility, especially for attitudes near perigee.

Of note was the release on Nov 12 of the CIAO 2.3 analysis software together with CALDB 2.18. The release includes a new tool that can be used to apply the CTI (charge transfer inefficiency) adjustment procedure. This correction restores some of the resolution lost due to radiation damage to the ACIS detectors early in the mission. For details, see http://cxc.harvard.edu.

The observing schedule for next week is shown below and includes the commanding for placing Chandra in the required configuration and attitude for the Leonids meteor shower on Nov 19.

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AX J1107.0-1150 ACIS-S Nov 17 RCS1325+2858 ACIS-S Radiation Belts Nov 18 A2384 ACIS-I 2236-176 ACIS-S Nov 19 MACSJ0011.7-1523 ACIS-I MACS-J0111.5+0855 ACIS-I Nov 20 SDSS J005102.42-0102 ACIS-S Radiation Belts Sigma Orionis HRC-I Nov 21 NGC 4038/NGC 4039 ACIS-S Nov 22 Radiation Belts Nov 23 MACSJ2245.0+2637 ACIS-I G084.2-0.8 ACIS-I Nov 24 AX J1618.1+3459 ACIS-S A2065 ACIS-I

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All spacecraft subsystems continued to operate nominally.

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