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Operations CXO Status Report
Friday 18 April 2003, 8.30am EST
During the last week the observing schedule was interrupted following
a high radiation event at 4:36pm on Apr 17 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 overnight and science will
be re-started on radiation belt exit at 9am on Apr 18. 4Ks of the
observation of RCS0439.6-2905 was impacted by the event.
Following a period of noisy behavior during April 11-13 the IRU-1
gyro-1 current has settled to ~150mA (its yellow limit). Products to
perform a swap to IRU-2 continue to be prepared in the event that they
are needed.
A Chandra press release was issued on 14 April that announced the
detection of X-rays from a low mass brown dwarf in a multiple star
system, which is as young as 12 million years old. For details see:
http://chandra.harvard.edu/press/03_releases/press_041403.html
The observing schedule for next week is shown below and includes three
observations of 3C58 totaling nearly 350Ks.
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Radiation Belts Apr 20
IGR J16358-4726 ACIS-S
PSR B1509-58 ACIS-I Apr 21
UN J1141-0143 ACIS-S
OH231.8+4.2 ACIS-S
LNS 3 ACIS-S Apr 22
3C58 ACIS-S
Radiation Belts Apr 23
3C58 ACIS-S
Radiation Belts Apr 26
3C58 ACIS-S
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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 |
