Chandra Operations CXO Status Report 19 July 2002

During the last week the observing schedule was interrupted following a high radiation event at 8:32am EDT on Jul 17 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 12.00pm on Jul 18. A total of 87Ks of observing time was impacted by the event and observations of NGC1600, PSS 0008+1923, HS 0017+2116 and Cas A will be rescheduled in a later load.

A real-time procedure was completed nominally on Jul 16 to uplink an update to the on-board gyro scale-factor and alignment matrix. Following the uplink, a series of test maneuvers run from the daily-load were monitored in real-time. The performance of the pointing system with updated values, matched model predictions extremely well.

The observing schedule for the next week is shown below and includes one constrained observation of IM Peg.

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Radiation Belts                      Jul 22
AX J1511.7+0758         ACIS-S
AQL X-1                 ACIS-S
Lambda And              HRC-S/LETG
HZ43                    HRC-S/LETG   Jul 23
HZ43 (2 obs)            HRC-I/LETG
Lamdba And              HRC-S/LETG
M87                     ACIS-S       Jul 24
1343-601                ACIS-S
H183611                 ACIS-I
Radiation Belts
IM Peg                  ACIS-S/HETG  Jul 25
WX Hyi                  ACIS-S/HETG
J2310-437               ACIS-S       Jul 26
NGC6861                 ACIS-I
DEM L 316               ACIS-S
Radiation Belts                      Jul 27
NGC 533                 ACIS-S
WX Hyi                  ACIS-S/HETG  Jul 28
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All spacecraft subsystems continued to operate nominally.