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Operations CXO Status Report

Friday 22 March 2024 9.00am EDT

During the last week the observing schedule was replanned to incorporate observations of EP240315A which was accepted as a Director's Discretionary Time Target of Opportunity on Mar 17. Impacted observations will be rescheduled in a future week.

Chandra passed through the 24th and 25th eclipses of the season on Mar 17 and 20 respectively, with nominal power and thermal performance.

Chandra press and image releases were issued on Mar 21 describing observations of quasar H1821+643. The black hole in the center of the quasar appears to be underactive. Using Chandra, the team found the density of gas near the black hole in the center of the galaxy is much higher, and the gas temperatures much lower, than in regions farther away. Scientists expect the hot gas to behave like this when there is little or no energy input (which would typically come from outbursts from a black hole) to prevent the hot gas from cooling down and flowing toward the center of the cluster. For details, see

Of note this week, was a letter to the Chandra Community from the Director. See:

The schedule of targets for the next week is shown below and includes observations of A0620-00, which was accepted as a Director's Discretionary Time Target of Opportunity on Mar 7 and is coordinated with JWST.

        2MASSJ08194059+0823    ACIS-I       Mar 25
        NGC4261                HRC-I
        A0620-00               ACIS-S
        Radiation Belts
        1E161348-5055.1        ACIS-S       Mar 26
        MCXCJ0928.6+3747       ACIS-I
        NGC4261                HRC-I
        A0620-00               ACIS-S
        VCC450                 ACIS-S       Mar 27
        2MASSJ08194059+0823    ACIS-I
        VCC1450                ACIS-S
        4C+62.29               ACIS-S
        NGC6204                ACIS-I
        Radiation Belts                     Mar 28
        4FGLJ0140.4+5114       ACIS-S
        NGC4261                HRC-I
        4FGLJ0140.4+5114       ACIS-S       Mar 29
        SDSSJ122404.62+04563   ACIS-S
        4FGLJ0140.4+5114       ACIS-S
        SDSSJ131206.32+3909    ACIS-S
        FRB20211127I           ACIS-S
        SNR1987A               HRC-S /LETG
        NVSSJ122810-092702     ACIS-S       Mar 30
        DES0424-3317           ACIS-I
        RMJ120920.0-021330.2   ACIS-I
        DES0424-3317           ACIS-I
        SDSSJ094422.03+4727    ACIS-S
        Radiation Belts                     Mar 31
        SDSSJ125142.28+2404    ACIS-S
        4C+62.29               ACIS-S
        SDSSJ125142.28+2404    ACIS-S
        UGC4305                ACIS-I
        NGC4261                HRC-I


All spacecraft subsystems continued to support nominal operations.

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