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Friday 1 July 2004 8:30am EDT
| During the last week the observing schedule was interrupted following
a high radiation event at 3:05pm on on Jun 29 that stopped the daily
load and activated the science instrument safing sequence (SCS
107). The event occurred just prior to radiation belt entry and was
caused by electrons contaminating the EPHIN's lowest energy proton
channel. The loads were re-planned and science was re-started
at radiation belt exit on Jun 30. In order to maintain a safe EPHIN
operating temperature, the originally scheduled targets NGC3132 and
F1300-2556 were dropped in the re-plan and the target GX 17+2 was
inserted. The dropped targets will be rescheduled in a future week.
During the week, two real-time procedures were completed associated with the SCS 107 execution: A real-time procedure was completed on June 29 to disable SCS 29, which was enabled by SCS 107 as a contingency. A real-time procedure was completed on June 30 to enable SCS 107 as a step in resuming the science mission. Of note last week was the conduct of the Chandra User's Committee meeting on Jun 29-30. The observing schedule for next week is shown below and includes coordinated observations of Sgr A* with VLT: |
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Radiation Belts Jul 5 M101 ACIS-S Sgr A* ACIS-I M101 ACIS-S Jul 6 Sgr A* ACIS-I M101 ACIS-S Jul 7 Radiation Belts SCULPTOR DWARF SPH ACIS-S Jul 8 HR 7329 B ACIS-S NGC 6357 Field I ACIS-I SNR G16.85-1.05 ACIS-I Jul 9 M101 ACIS-S Radiation Belts Jul 10 M101 ACIS-S SNR G16.85-1.05 ACIS-I Jul 11 A3395s ACIS-I
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All spacecraft subsystems continued to support nominal operations.
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Revised: July 08, 2022