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: http://chandra.harvard.edu/press/05_releases/press_040605.html http://chandra.harvard.edu/press/05_releases/press_040705.html The schedule of targets for the next week is shown below and includes a DDT observation of HESS J1826-148 coordinated with HESS. |
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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
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All spacecraft subsystems continued to support nominal operations.
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Revised: July 08, 2022