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Friday 10 June 2011 9.00am EDT
| During the last week the observing schedule was interrupted by a high
radiation event that stopped the daily load at 11:23am EDT on Jun 7
and activated the science instrument safing sequence (SCS 107). All
spacecraft actions were nominal. A real-time procedure was executed on
Jun 7 to re-enable the spacecraft momentum monitor, which had been
left disabled by the stoppage of the daily load. A real-time procedure
was executed on Jun 8 to verify that the radiation environment as
observed by the HRC anticoincidence shield had decreased to an
acceptable level and a replanned schedule was started. Several Norma
Region observations were impacted and will be rescheduled. The
replanned schedule included an observation of PTF11eon, which was
accepted as a Target of Opportunity on Jun 3.
Chandra passed through the 21st, 22nd, and 23rd eclipses of the spring season on Jun 4, 7, and 9 respectively. The 21st and 22nd eclipses proceeded with nominal power and thermal performance. Real-time procedures were executed to disable SCS-29 and to set the short-eclipse flag to false (medium) on Jun 8 following the completion of the planned eclipse season activities. The 23rd and final eclipse of the season was a penumbra only type and was expected to require no action. However, the thermal trend on the arrays during this event resulted in an unexpected eclipse detection and connection of the batteries to the spacecraft bus. The handling of this event by the on-board EPS manager software went nominally. A real-time procedure was executed on Jun 9 to update the on-board ephemeris. The schedule of targets for the next week is shown below |
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Radiation Belts Jun 12 HD50806 ACIS-S NormaRegion (8 obs) ACIS-I Jun 13 Radiation Belts Jun 15 PSRJ0726-2612 ACIS-S NormaRegion (8 obs) ACIS-I Radiation Belts Jun 17 1ES1553+113 HRC-S/LETG Jun 18
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All spacecraft subsystems continued to support nominal operations.
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Revised: July 08, 2022