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Operations CXO Status Report

Friday 4 June 2010 9.00am EDT

Chandra entered Normal Sun Mode (NSM) at 11:36 pm EDT on Saturday May 29 as the result of a reset of the Interface Unit (IU) on-board the spacecraft. Entry into NSM was nominal and assessment of the telemetry indicated that all spacecraft hardware was performing nominally. Engineering assessment suggested that the reset of the IU and subsequent transition to NSM was due to a single event upset and the decision was made to recover to normal pointing mode and continue with science. The recovery took place on May 30-31 and science was resumed on June 1 at 1 am. Science targets that were impacted by the anomaly will be rescheduled in a future load.

Chandra passed through the ninth and tenth eclipses of the 2010 summer season on May 30 and June 1 respectively, with nominal power and thermal performance.

In addition to the real-time procedures associated with the NSM recovery, a real-time procedure was executed on May 30 to configure Chandra for the ninth eclipse of the season as the transition to NSM had halted the on-board configuration commands. An additional real-time procedure was executed on June 3 to perform a routine self-check of the Electrical Interface Assembly (EIA) Sequencer.

The schedule of targets for the next week is shown below and includes an observation of WPVS 007 coordinated with HST.

------------------------------------------
Radiation Belts                     Jun  7
NGC4648                ACIS-S
SDSSJ155811.24+3957    ACIS-S
SerpensSouth           ACIS-I
IC1396_BRC36           ACIS-I       Jun  9
NGC4939                ACIS-S
SDSSJ153425.59+0408    ACIS-S
PGC1209872             ACIS-S
Radiation Belts                     Jun 10
Q0957+561              ACIS-S
ChandraDeepField-S     ACIS-I
WPVS007                ACIS-S       Jun 11
ChandraDeepField-S     ACIS-I
Radiation Belts                     Jun 12
ChandraDeepField-S     ACIS-I       Jun 13

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

All spacecraft subsystems continued to support nominal operations.

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