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Operations CXO Status Report

Friday 10 May 2002 10.00am EDT

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

A software patch was approved to increase two glitch counters to mitigate unintended EPHIN hardware failure flag state changes. State changes in April and last December led to loss of science time due to SCS 107 executions. The cause has been traced to a subtle timing interaction. Uplink of the patch is expected next week.

Chandra will pass through a 15 minute lunar eclipse on 11 May. Due to the short duration and small change in solar array illumination, no actions on-board are required. A 3 degree F temperature drop in the solar arrays is predicted, and comparisons will be made with the actual performance using dump data following the eclipse.

The observing schedule for the next week is shown below and includes an observation of Mrk 279 coordinated with Hubble Space Telescope.

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G349.7+0.2 ACIS-S May 12 NGC6397 ACIS-S May 13 XRF020427 ACIS-S Radiation Belts May 14 0858-771 ACIS-S 1343-601 ACIS-S SNR 1987A ACIS-S 0903-573 ACIS-S May 15 NGC6397 ACIS-S G21.5-0.9 ACIS-I LBQS 2350-0045A ACIS-S May 16 G21.5-0.9 ACIS-S PSS 1605+4405 ACIS-S Q0740+380 ACIS-S Radiation Belts May 17 NGC 2782 ACIS-S RXJ1552.2+2013 ACIS-S Mrk279 ACIS-S/HETG May 18

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All spacecraft subsystems continued to operate nominally.

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