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Operations CXO Status Report

Friday 18 August 2000 11.00am EDT

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

Real-time procedures were conducted during the week to perform the 8th ACIS Squeegee Mode test, retract the LETG, and perform a solar array off-point demonstration.

The Squeegee Mode Test was conducted at 6.30am EDT on Aug 12 and tested a new subarray mode. Initial analysis results indicate that the FWHM is comparable to the "maximum angular resolution" squeegee mode. This represents the last new mode test planned for the Squeegee runs.

The LETG retraction was performed at 6.30pm EDT on Aug 12 using a long move of 153 seconds followed by 9 short moves of 0.128 seconds duration. The total time was well within the range of expected times and telemetry indicated a nominal move.

The solar array off-pointing demonstration was conducted at 10.30pm EDT on Aug 14 using a combination of real-time and daily load commanding. The arrays were off-pointed by 75 degrees and then adjusted a further 1.5 degrees to ensure sufficient battery depth of discharge. The test proceeded as planned and the data collected from the demonstration will be used to determine the correct off-point angle for the lunar eclipse to occur in October. The solar array off-pointing will ensure that the spacecraft avoids a bus over-voltage condition at the completion of the eclipse.

The planned observations for the coming week are as follows:

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MCG-6-30-15 ACIS-S/HETG Aug 21 4U 1728-16 ACIS-S/HETG Aug 22 4U 1700-37 ACIS-S/HETG Radiation Belt 4U 1822-37 ACIS-S/HETG Aug 23 X2127+119 ACIS-S/HETG Aug 24 SS CYGNI ACIS-S/HETG NGC 1275 ACIS-S/HETG Q0836+7104 ACIS-S/HETG Aug 25 Radiation Belt ABELL 1835 ACIS-S/HETG Aug 26 M31 Transient ACIS-I Aug 27 0248+430 ACIS-S Radiation Belt Aug 28

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All spacecraft subsystems continued to operate nominally.

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