Operations CXO Status Report

Friday 20 June 2003 7.30am EDT

During the last week Chandra completed the observing schedule as planned. Following the warm-restart of IRU-1 gyro-1 on 13 June, its current has returned from the restart value of ~100 mA to approximately the same level as prior to the warm-restart (~140 mA). This behavior is consistent with a trend towards eventual out of spec (anomalous) performance and the team is currently assessing a swap to IRU-2 in order to retain maximum operational lifetime on gyro-1. IRU-2 has continued to operate in parallel with IRU-1 and the initial calibration was completed last week without impact to operations. A Chandra press release was issued on June 19 describing results from the Great Observatories Origins Deep Survey (GOODS) that combines observations from both Chandra and Hubble. For details see: http://chandra.harvard.edu/press/03_releases/press_061903.html. The observing schedule for next week is shown below and includes a follow-up observation of the Target of Opportunity H1743-322.

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Radiation Belts                     Jun 22
H1743-322              ACIS-S/HETG  Jun 23
Mrk 1044                            Jun 24
SDSS J014812.23+0001   ACIS-S       Jun 25
Radiation Belts
AX J1845-0258          ACIS-S       Jun 26
RCRADARKCLOUD          ACIS-I
AX J1845-0258          ACIS-S
G11.2-0.3              ACIS-S       Jun 27
NGC 6440               ACIS-S
NGC 5728               ACIS-S
DLS J0522-4820         ACIS-I
Radiation Belts                     Jun 28
AX J1845-0258          ACIS-S
Markarian 290          ACIS-S/HETG

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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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