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Operations CXO Status Report

Friday 27 October 2000 11.00am EDT

During last week the observing schedule was completed as planned with the exception of approximately 6 hours of ACIS observing that was impacted when the ACIS Digital Processing Assembly (DPA-A) powered off at 11:42 am EDT on 26 Sept. The turn-off was detected during a real-time pass and following engineering assessment, the DPA was powered on and ACIS returned to science operation. ACIS has operated nominally since then and the cause of the turn-off is being investigated by the ACIS engineering team. Observations of HD100546, HD104237 and a portion of Sgr A were impacted and will be rescheduled.

Real-time procedures were completed during the week to recover the data stored on SSR-A that were lost on the ground (20 Oct), retract the LETG as planned (25 Oct), load the software patches and disable an Electrical Power System safing monitor in preparation for the lunar eclipse on 27 Oct (25 Oct), and to power-on the ACIS DPA and resume ACIS science operation (26 Oct). A routine check of the CPE Warm Start Count was also completed on 23 Oct and showed the value remained at 1.

The planned observations for the coming week are as follows.

SN 1999EM ACIS-S Oct 29 GSGP4X:082 ACIS-S Oct 30 GSGP4X:057 ACIS-S GSGP4X:069 ACIS-S Radiation Belt W44 ACIS-S Oct 31 V1701+6414 ACIS-I M31 ACIS-S Nov 1 NGC 891 ACIS-S Radiation Belt Nov 2 NGC 3623 ACIS-S Nov 3 PG1115+080 ACIS-S Crab Nebula ACIS-S A401 ACIS-I NGC 1700 ACIS-S 3C 207 ACIS-S Nov 4 AGX J104645+1140 ACIS-I AGX J111432+4056 ACIS-I Radiation Belt M31 ACIS-S Nov 5


With the above noted, the spacecraft subsystems continued to operate nominally.

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