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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.

------------------------------------------
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

------------------------------------------

All spacecraft subsystems continued to operate nominally.

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