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Operations CXO Status Report

Friday 10 November 2000 7.30am EST

Last week the observing schedule was interrupted following a high radiation event at 6:26pm EST on Sept 8 that stopped the daily load and activated the science instrument safing sequence (SCS 107). All actions were nominal and assessment of the dump data confirmed that the trigger was due to high proton counts in the EPHIN P4GM channel exceeding the pre-defined threshold of 300 counts/cm^2/s/sr. Observations will be resumed once the radiation falls to an acceptable level and impacted observations will be rescheduled.

A routine check of the CPE Warm Start Count was completed on 6 Nov and showed the value remained at 1.

A milestone was passed on November 1 - the official transition from observing cycle 1 to cycle 2 targets. November 1 was also the cut-off date for Cycle 1 peer reviewed Targets Of Opportunity. A small number of Cycle 1 targets have been scheduled for December and January due to their observing constraints.

The planned observations for the coming week are as follows.

Radiation Belts Nov 13 Z Andromedae ACIS-S/HETG Hydra A ACIS-S/HETG MCG-5-23-16 ACIS-S/HETG RX J0925.7-4758 ACIS-S/HETG Nov 14 Radiation Belt Nov 15 CTI ACIS Nov 16 A383 ACIS-I MITG J0414+0534 ACIS-S A383 ACIS-S HCG 16 DOS ACIS-S M31 Nucleus ACIS-S M31 (multiple) HRC-I AC114 ACIS-S Nov 17 HE2149-2745 ACIS-S Radiation Belts Nov 18 Eta Car ACIS-S/HETG PMN J1131+0455 ACIS-S Nov 19 NGC 3368 ACIS-S Nov 20


All spacecraft subsystems continued to operate nominally.

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