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Operations CXO Status Report

Friday 17 January 2003 8.30am EST

During the last week Chandra completed the observing schedule as planned.

A real-time procedure was completed on 12 Jan to perform a calibration of the Momentum Unloading Propulsion System (MUPS) thrusters. Spacecraft rate and thruster valve data indicated nominal performance for the A-1 thruster (and all others) and the procedure was followed by a manual unload of momentum without the use of A-1. A real-time procedure was completed on 15 Jan to unload momentum using the A-1 thruster and a performance decrease similar to that seen on 22 Dec was observed. The cause of the anomalous A-1 performance is being investigated. At present, through careful scheduling and momentum management, the science program is not being impacted.

Of note last week was the conduct on Jan 14 of the 2003 Chandra Fellows Peer Review.

The observing schedule for next week is shown below and includes the last in a series of long observations of the Orion Nebula.

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Radiation Belts Jan 20 Orion Nebula Cluster ACIS-I Jan 21 MACSJ0035.4-2015 ACIS-I A2626 ACIS-S Jan 22 MACSJ2228.5+2036 ACIS-I First J070625+390151 ACIS-S SDSS083946.22+511202.8 ACIS-S First J110223+223920 ACIS-S Radiation Belts Jan 23 MACSJ1115.8+0129 ACIS-I HZ43 HRC-I/LETG M 2-9 ACIS-S Jan 24 A1367 NW ACIS-S NGC 3310 ACIS-S 2MASS102127+631130 ACIS-S Jan 25 PC 0947+5628 ACIS-S A773 ACIS-I Jan 25 Radiation Belts RX J193458.1+335301 ACIS-S Jan 26 RX J2020.3+4026 ACIS-S

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All spacecraft subsystems, with the exception of MUPS thruster A-1 as noted above, continued to operate nominally.

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