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Operations CXO Status Report
Friday 27 June 2003, 7.30am EDT
During the last week the observing schedule was interrupted following
a high radiation event at 4:32pm on Jun 22 that stopped the daily load
and activated the science instrument safing sequence (SCS 107). The
event occurred just prior to radiation belt entry and is thought to be
due to a 'puffed-up' belt state caused by high levels of coronal
stream activity. The loads were replanned overnight and science was
re-started at radiation belt exit at 10.40am on Jun 23 with 7.5Ks of
science loss.
The IRU-1 gyro-1 current remained noisy with a base level near 140 mA
during the last week. Given the continued elevated current levels and
behavior following the warm-restart on Jun 13, the decision has been
made to swap to IRU-2 and retain maximum operational lifetime on IRU-1
gyro-1. The swap is expected to be made on July 19 during a suitable
comm period and will be made during perigee to ensure no impact to
science.
Of note last week was the installation of an update to the ground
system (ONLS 3.9.3) on June 25 and the conduct of the Cycle-5 Chandra
Peer Review during June 24-26.
The observing schedule for next week is shown below.
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87GB 1342+5518 ACIS-S Jun 29
SNR G54.1+0.3 ACIS-I
Radiation Belts Jun 30
3C296 ACIS-S Jul 1
3C 249.1 Field ACIS-I Jul 2
AX J1845-0258 ACIS-S
NGC 1705 ACIS-S
M87 ACIS-S Jul 3
Radiation Belts
DEM L71 ACIS-S Jul 4
AP Librae ACIS-S
NGC 3631 ACIS-S
Radiation Belts Jul 5
DEM L71 ACIS-S Jul 6
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All spacecraft subsystems, with the exception of the MUPS thruster A-1
under investigation, continued to operate nominally.
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