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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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