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Operations CXO Status Report

Friday 8 April 2005 9.00am EST

During the last week the observing schedule was interrupted following a high radiation event at 8:59pm on Apr 5 that stopped the daily load and activated the science instrument safing sequence (SCS 107). The event occurred just prior to radiation belt entry and is thought to be due to a 'puffed-up' belt state caused by high levels of coronal stream activity. The loads were replanned and science was re-started at radiation belt exit on Apr 6 with 2.7 Ks of science loss. As a result of the SCS 107 run the attitude during perigee was not as planned and resulted in an elevated temperature for the IEPHIN causing a rail voltage drop. This was anticipated in the re-plan and considered acceptable for this case.

A Chandra press release was issued on Apr 6 describing deep X-ray observations that combined with sub-mm data provide evidence that some extremely luminous adolescent galaxies and their central black holes underwent a phenomenal spurt of growth more than 10 billion years ago. A second release was issued on Apr 7 describes a study of "fossil galaxies" - ancient galaxy groups in which all of the large galaxies have gradually merged to form one central giant galaxy. For details see:

The schedule of targets for the next week is shown below and includes a DDT observation of HESS J1826-148 coordinated with HESS.

NGC5353                ACIS-I       Apr 10
SDSS J115314.36+03     ACIS-S
IRAS05436-0007         ACIS-I
Radiation Belts                     Apr 11
E0102-72               ACIS-S
Cas A                  ACIS-I       Apr 12
Cas A                  ACIS-S
Cas A                  HRC-I
FIRST J131739.2+41     ACIS-S
RCS1107.3-0523         ACIS-S
HESS J1826-148         ACIS-S
A2142                  ACIS-I       Apr 13
2QZ J114327.3-0050     ACIS-S
Radiation Belts
87GB 1143+4437         ACIS-S       Apr 14
3C 325                 ACIS-S
NGC 5548               HRC-S/LETG   Apr 15
Radiation Belts                     Apr 16
3C 325                 ACIS-S       Apr 17
NGC 5548               HRC-S/LETG
E0102-72               ACIS-S


All spacecraft subsystems continued to support nominal operations.

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