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Operations CXO Status Report
Friday 25 July 2003, 9.30am EDT
During the last week the observing schedule was replanned to include
an observation of the the X-ray Flash source H2777 that was accepted
as a 3 day turn-around Target Of Opportunity (TOO) on 23 July. Loads
were replanned and uplinked on Jul 24 for the observation on Jul 25. A
portion of an observation of M8 was impacted by the TOO and has been
rescheduled for next week.
As previously reported, the swap from Inertial Reference Unit-1
(IRU-1) to IRU-2 was completed as planned on July 19 and the mission
is proceeding nominally under IRU-2 control. IRU-1 is now configured
as the backup IRU for use in the event of a safemode transition. A set
of maneuvers was performed following the swap to verify the updated
IRU calibration and completed with acceptable results. The swap was
performed during a perigee passage and the science program was
restarted following radiation belt exit.
A real-time procedure was completed on July 22 to perform a manual
unload of momentum. The unload was performed at an attitude that
ensured a cooler starting temperature than prior anomalous
unloads. Thruster performance was nominal during the unload.
The observing schedule for next week is shown below.
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Radiation Belts Jul 27
M8 ACIS-I
ZWCL1215 ACIS-I Jul 28
J1314+3649 ACIS-S
NGC5678 ACIS-S
PC 1447+4750 ACIS-S
HR 6406 HRC-I
V404 CYG ACIS-S
NGC7465 ACIS-S Jul 29
3810 ACIS-S
M33 X-8 (Nucleus) HRC-S
Radiation Belts
H1743-322 ACIS-S/HETG Jul 30
A3571 ACIS-S Jul 31
NGC 4168 ACIS-S
EXO 1747-214 ACIS-S
OGLE-1999-BUL-32 ACIS-S
G11.2-0.3 ACIS-S Aug 1
AX J1845-0258 ACIS-S
Radiation Belts
SDSS J0654.11-001533.4 ACIS-S Aug 2
MS0440.5+0204 ACIS-S
NGC 988 ACIS-S
A209 ACIS-I Aug 3
F01004-2237 ACIS-S
SGR 1806-20 ACIS-S
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All spacecraft subsystems, with the exception of the MUPS thruster A-1
under investigation, continued to operate nominally.
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