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Operations CXO Status Report

Friday 11 April 2003 10.00am EST

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

The IRU-1 gyro-1 current has continued to display elevated and noisy behavior above its yellow limit (150mA) but below its red limit (200mA). Following discussions with the vendor, procedures and products for a B-side IRU swap are being readied in the event that they are needed. The gyro bias level has remained unaffected by the change in current and so to date, there has been no impact to science or operations.

A real-time procedure was completed on Apr 7 that verified the CPE warm start count has remained unchanged at 1 since Oct 18.

The observing schedule for next week is shown below and includes 2 observations of Saturn and observations of XTE J1908+094, 1136-135, and Cyg X-1 coordinated with the VLA, HST and RXTE respectively.

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J2044+7044 ACIS-S Apr 13 FIRST J142114+282452 ACIS-S M87 ACIS-S Apr 14 Saturn (2 obs) ACIS-S Radiation Belts Apr 15 F12112+0305 ACIS-S 1136-135 ACIS-S RCS0439.6-2905 ACIS-S Apr 16 Radiation Belts Apr 17 Abell 3526 (2 obs) ACIS-S Apr 18 A1736 ACIS-I Apr 19 SDSS J145123.02-625.9 ACIS-S XTE J1908+094 ACIS-S Cyg X-1 ACIS-S/HETG SDSS J143352+022714 ACIS-S Apr 20 A2063 ACIS-I

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All spacecraft subsystems, with the exception of the MUPS thruster A-1 under investigation and gyro-1 as noted above, continued to operate nominally.

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