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Operations CXO Status Report

Friday 25 January 2002 10.00am EST

During the last week the observing schedule was interrupted when the spacecraft transitioned to bright star hold following a long maneuver at 10.53pm EST on Jan 23. All actions were nominal and analysis of the real-time and dump data determined that the transition was due to a maneuver error of 150 arcsec exceeding the aspect camera star search box size of 120 arcsec. The error resulted from the combination of the specific eigenaxis alignment for the long maneuver and a slightly inaccurate on-board gyro scale-factor and alignment matrix. An updated gyro scale-factor and alignment matrix is currently under test and will be uplinked following approval. In the meantime, loads will be screened for similar maneuver cases.

A nominal recovery from bright star hold was completed at 2.40pm EST on Jan 24 and loads were rebuilt and resumed by 4pm in time for an observation of V471 Tau coordinated with HST. Observations of Cas A and IC342 were impacted and will be rescheduled in a future load.

Of note last week was the release of the Chandra cycle 4 NRA by NASA HQ. The proposal deadline is March 15, 2002.

The observing schedule for next week is shown below.

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Q1458+718 ACIS-S Jan 27 CYG X-1 ACIS-S/HETG Jan 28 Vela PWN ACIS-S Radiation Belts SDSSP J130608+035626(3) ACIS-S Jan 29 NGC 3245 ACIS-S NGC 4438 ACIS-S CYG X-1 ACIS-S HS0248+3402 ACIS-S 0229+131 ACIS-S Jan 30 PSS 0311+0407 ACIS-S G166.0+4.2 ACIS-I HS0810+2554 ACIS-S IRAS 05189-2524 ACIS-S VLA J0636+1838 ACIS-I Radiation Belts Beta Cru ACIS-S/HETG Jan 31 YY MEN, HD 32918 ACIS-S/HETG Feb 1 Radiation Belts Feb 2 GX 301-2 ACIS-S/HETG Feb 3

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All spacecraft subsystems continued to operate nominally.

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