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Operations CXO Status Report

Monday 5 June 2000 10.00am EDT

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

A routine real-time procedure was completed on 5/29 to dump the CPE warm start counter and showed no change in value (1).

A momentum auto-unloading event was performed by Chandra for the first time on 6/1/00 at 1:19pm EDT. Momentum unloading is normally predicted and performed via stored commands from the daily load, so the auto-unload was unexpected. The unloading was near perigee where a gravity gradient torque larger than predicted is suspected. The auto-unloading proceeded nominally.

The planned observations for the coming week are as follows.

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PSR B0540-69 HRC-I/-S/ACIS-S Jun 5 B1138-262 ACIS-S CB 58 ACIS-S Jun 6 V1494AQL ACIS-I Vega ACIS-S/HRC-I/-S Jun 7 Radiation Belts AX J1025+4714 ACIS-I Cen Cluster ACIS-S Cir X-1 ACIS-S/HETG Jun 8 MCG-6-30-15 ACIS-S/HETG X0918-54 ACIS-S/HETG RXTE J1550-564 (TOO) ACIS-S/HETG Jun 9 4U 1735-44 ACIS-S/HETG 1746-331 ACIS-S 1711-339 ACIS-S Radiation Belts HD 113703 ACIS-S Jun 10 HD 129791 ACIS-S HE 1104-1805 ACIS-S MS 1008.1-1224 ACIS-I Jun 11

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All spacecraft subsystems continued to operate nominally.

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