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Operations CXO Status Report
Friday 30 May 2003, 7.00am EDT
Last week the observing schedule was halted due to high radiation
associated with solar flare activity. The loads were halted on May 29
at 4:47pm EDT through a ground command to execute the SI Safing SCS 107.
This ensured that the accumulated radiation dose for ACIS remained
below the allowed threshold. Loads will be re-started once radiation
levels reach an acceptable level.
A real-time procedure was run on 27 May to lower the ACA CCD
temperature from -11 to -12 deg C to mitigate the increasing number of
warm pixels. This is the second of five planned 1 degree step
reductions. An assessment of aspect camera data following the first
reduction on May 8 shows an expected improvement.
The IRU-1 gyro-1 current remained quiet and near 140 mA during the
last week (a slight decrease in the current level).
Two Chandra press releases were issued on May 26 in conjunction with
the AAS meeting. The first discussing the oxygen-rich Supernova
remnant 0103-72.6, and the second describing a new way to determine if
a young star is surrounded by a planet-forming disk like our early
Sun. For details see:
http://chandra.harvard.edu/press/03_releases/press_052603b.html
http://chandra.harvard.edu/press/03_releases/press_052603.html
The observing schedule for next week is shown below and includes an
observation of 3C279 coordinated with Integral.
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Radiation Belts Jun 1
SGR 1900+14 ACIS-S Jun 2
FIRST J164442+261913 ACIS-S
3C 279 HRC-S/LETG
F15130-1958 ACIS-S
HR 5512 HRC-I
W51B ACIS-I
4C 74.26 ACIS-S/HETG Jun 3
Radiation Belts Jun 4
4U 1626-67 ACIS-S/HETG
RCS0439.6-2905 ACIS-S Jun 6
XMM 1HR - Field 3 ACIS-I
Radiation Belts
HIP 92680 ACIS-S/HETG Jun 7
XMM 1Hr - Field 4 ACIS-I Jun 8
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All spacecraft subsystems, with the exception of the MUPS thruster A-1
under investigation, continued to operate nominally.
Return to 2003 Status Reports |
