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Operations CXO Status Report

Friday 17 December 2021 9.00am EST

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

Chandra passed through the seventeenth, eighteenth, and nineteenth (and final) eclipses of the season on Dec 11, Dec 13, and Dec 16 respectively, with nominal power and thermal performance. Real-time procedures were executed on Dec 16 to disable SCS-29 and to dump and clear the EPS glitch counters as post-eclipse season actions.

Of note this week was the release on Dec 15 of the Cycle 24 Call for Proposals. The proposal submission deadline is 10 March 2022. In conjunction with the call was the release on Dec 14 of the CIAO 4.14 analysis software system and DS9 8.3. For details see:

Chandra press and image releases were issued on Dec 16 describing a new Chandra study of the galaxy cluster known as RBS 797, located about 3.9 billion light-years from Earth. The study disclosed two separate pairs of cavities extending away from the center of the cluster. Such cavities are common in the hot X-ray emitting gas that fills the space between galaxies in clusters, and are believed to originate in eruptions from supermassive black holes in central cluster galaxies. The remarkable feature of the RBS 797 cavities is that there are two sets directed perpendicular to each other. The presence of two active black holes in a mutual orbit is the basis of one explanation of this structure. Another explanation is based on a single black hole that shifted the direction of its jets within about 10 million years, a remarkably short time. For details, see

The schedule of targets for the next week is shown below and includes an observation of LHS2021 coordinated with HST.

        J0435+3401             ACIS-S       Dec 19
        WINGSJ211347.41+022    ACIS-S       Dec 20
        J0435+3401             ACIS-S
        WINGSJ211347.41+022    ACIS-S
        PKS1150+497            ACIS-S
        ColdECSBlankSky        HRC-S
        LHS2021                ACIS-S       Dec 21
        Radiation Belts
        M96                    ACIS-I
        TOI609                 ACIS-S       Dec 22
        MCG6-26-012            ACIS-S
        PSZ2G288.27+39.97      ACIS-I
        SN2002hi               ACIS-S
        HE1434-1600            ACIS-I
        SDSSJ074922.96+2255    ACIS-S       Dec 23
        HE1434-1600            ACIS-I
        SDSSJ074922.96+2255    ACIS-S
        PKS1150+497            ACIS-S
        Radiation Belts                     Dec 24
        SPT-CLJ2215-3537       ACIS-S
        SWIFTJ0538.3+2147      ACIS-I
        HEPG186.764-05.375     ACIS-I       Dec 25
        SPT-CLJ2215-3537       ACIS-S
        PSZ2G125.30-27.99      ACIS-I
        SDSSJ082618.04+5653    ACIS-S
        PKS1150+497            ACIS-S
        CGCG245-031            ACIS-S       Dec 26
        SN2012cc               ACIS-S
        [VV2006]J083322.5+0    ACIS-S
        Radiation Belts


All spacecraft subsystems continued to support nominal operations.

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