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Operations CXO Status Report

Friday 23 August 2013 9.00am EDT

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

Chandra passed through the eleventh, twelfth, and thirteenth eclipses of the season on Aug 16, 19, and 21 respectively, with nominal power and thermal performance.

A real-time procedure was executed on Aug 19 to perform a check-out of the B-side MUPS thrusters. The goal of the check-out was to clear the suspected gas bubbles from the lines feeding the thrusters on the hot side of the spacecraft, which had exhibited reduced thrust during the Aug 3 checkout. The two cold-side thrusters continued to perform at nominal thrust and one of the hot-side thrusters performed at nominal thrust by the end of the checkout. However, the second hot-side thruster, MUPS-B2, showed no thrust after after multiple firings. The cause for the lack of thrust on MUPS-B2 is under investigation. A flight software patch was uplinked on Aug 21 that will keep MUPS-A active for use in the case of a Safe Mode entry, avoiding the uncontrolled use of MUPS-B2.

Of note this week was the release on Aug 22 of CALDB 4.5.8. This update includes ACIS time-dependent gain corrections for the period May-July 2013. For details see:

The schedule of targets for the next week is shown below

        PSRJ1044-5737          ACIS-I       Aug 25
        PSRJ0633+1746          ACIS-I
        3C147                  ACIS-S       Aug 26
        Q2237+0305             ACIS-S
        M31BHXN                ACIS-I
        DeepField06            ACIS-I
        Radiation Belts                     Aug 27
        AM0642-801             ACIS-S
        ESO455-33              ACIS-S
        HAE220                 ACIS-S       Aug 28
        PSRJ0633+1746          ACIS-I
        CODEX12451             ACIS-I
        Q2237+0305             ACIS-S
        SDSSJ083803.67+5406    ACIS-S       Aug 29
        A2110                  ACIS-I
        betaDor                ACIS-I
        Radiation Belts
        SMCDeepField01         ACIS-I       Aug 30
        PSRJ0633+1746          ACIS-I
        A665                   ACIS-I       Aug 31
        Q2237+0305             ACIS-S
        3C49                   ACIS-S
        SgrA*                  ACIS-S
        SMCDeepField01         ACIS-I


All spacecraft subsystems continued to support nominal operations.

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