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Operations CXO Status Report

Friday 21 June 2002 8.00am EDT

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

A real-time procedure was completed successfully on June 17 to check the bright Earth limb limitation with the aspect camera during perigee passage. One issue identified during the procedure was that a series of hardware commands sent from the daily load to the aspect camera to acquire monitor windows was not executed. The issue is under investigation.

Initial assessment of the results from the Earth limb check shows consistency with prior measurements made in November 2001. The camera remains locked on stars to within ~4-5 degrees of the bright earth (this compares with the 20 degree current limitation). Further measurements are planned before a constraint change can be considered.

The observing schedule for the next week is shown below and includes two observations of Her X-1 that are phase constrained.

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BRI2235-0301 Jun 23 1AXG J010952-1252 ACIS-I AX J0146.2-0354 ACIS-S Jun 24 A133 ACIS-I NGC 985 ACIS-S/HETG Radiation Belts Jun 25 RXJ0027.6+2616 ACIS-I Jun 26 1AXG J003331-2139 ACIS-I HS 2135+1326 ACIS-S A133 ACIS-I HD 150136 ACIS-S/HETG Jun 27 Radiation Belts Jun 28 GRS 1758-258 HRC-I Her X-1 ACIS-S/HETG AX J1354.0+3346 ACIS-S Jun 29 Her X-1 HRC-S/LETG MACSJ1427.6-2521 ACIS-I TON 1388 HRC-S/LETG IRAS 11119+3257 ACIS-S Jun 30

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All spacecraft subsystems continued to operate nominally.

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