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Operations CXO Status Report

Friday 28 August 2009 10.00am EDT

During the last week the observing plan was halted on August 28 due to an incorrect load running on the spacecraft. The loads had been replanned early in the week to allow time for a MUPS diagnostic thruster firing but one load segment from the original schedule for the week was mistakenly uplinked midweek. Ground procedures will be modified to prevent this mistake from occurring in the future. In conjunction with halting the on-board loads real-time procedures were performed to prepare ACIS for entering the Earth's radiation belts and to dump the memory locations of the suspect load segment. Observations of SDSS J235833.20+0034 and IRAS 01298-0744 were affected by the interruption and will be rescheduled in a future week.

A real-time procedure was conducted on August 26 to perform a diagnostic firing of the MUPS thrusters as part of the investigation of the anomalously low reading for the pressure in the MUPS tank. The impulse generated by the thrusters during the test reflected a tank pressure consistent with the pre-anomaly reading, indicating that the root cause for the anomalously low readings was faulty readings from the pressure transducer. Given this result, the attitude restrictions imposed to minimize the temperatures of the MUPS tank and fill panel have been lifted and the scheduling of momentum dumps to manage spacecraft angular momentum is once again allowed.

A Chandra image release was issued on August 27 of Cygnus X-1. The Cygnus X-1 system consists of a black hole with a mass about 10 times that of the Sun in a close orbit with a blue supergiant star with a mass of about 20 Suns. Gas flowing away from the supergiant in a fast stellar wind is focused by the black hole, and some of this gas forms a disk that spirals into the black hole. The gravitational energy release by this infalling gas powers the X-ray emission from Cygnus X-1. For further details see: http://chandra.harvard.edu/photo/2009/cygx1/

The schedule of targets for the next week is shown below

------------------------------------------
Radiation Belts                     Aug 30
SPT-CL2343-5411        ACIS-I       Aug 31
ZwCl0348               ACIS-S       Sep  1
NGC7814                ACIS-S
Radiation Belts                     Sep  2
SPT-CL2343-5522        ACIS-I       Sep  3
MRK996                 ACIS-S
SDSSJ204744.81-0618    ACIS-S       Sep  4
SDSSJ205822.14-0650    ACIS-S
PGC65766               ACIS-S
SDSSJ210455.31-0035    ACIS-S
IGRJ01400-0757         ACIS-I       Sep  5
Radiation Belts
SDSSJ212402.97+1147    ACIS-S
IGRJ01517-0533         ACIS-I
NGC788                 ACIS-S       Sep  6
ZwCl235                ACIS-S
KUG0201-103            ACIS-S
SPT-CL2356-5056        ACIS-I

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

All spacecraft subsystems continued to support nominal operations.

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