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Operations CXO Status Report

Friday 10 November 2023 9.00am EST

During the last week, the observing schedule was interrupted due to high radiation associated with solar activity. The loads were halted at 7:30am EST on Nov 5 through a ground command to execute the SI Safing SCS 107. This ensured that the accumulated radiation dose for ACIS remained below the allowed threshold. All spacecraft actions were nominal. Loads for a replanned schedule were uplinked on Nov 7 with about 90ks of science time lost. Planned observations impacted by the interruption will be rescheduled.

A real time procedure was executed on Nov 4 to set the short eclipse flag to "false" in preparation for the medium-length eclipse expected. Real-time procedures were executed on Nov 7 to disable SCS-29 and to dump and clear the EPS glitch counters as post-eclipse season actions.

Chandra passed through the 24th and 25th (and final) eclipses of the season on Nov 3 and 6, respectively, with nominal power and thermal performance.

Chandra press and image releases were issued on Nov 6 describing the discovery of the most distant black hole ever detected in X-rays. Located in a galaxy labeled UHZ1 at a distance of about 13.2 billion light-years, the black hole and its host galaxy are seen when the universe was only 3% of its current age. UHZ1 is fortuitously along the line-of-sight to the much closer galaxy cluster Abell 2744 and could be detected because gravitational lensing caused by Abell 2744 enhances the signal from UHZ1. This discovery, based on combining data from Chandra (to identify the black hole, with an estimated mass between 10 and 100 million Suns) and James Webb Space Telescope (to identify the parent galaxy), is important for understanding how some supermassive black holes reach remarkably large masses soon after the big bang, given physical limits on their rate of growth. For details see:

The schedule of targets for the next week is shown below and includes observations of HE0230-2130, which is a follow-up to a Director's Discretionary Time Target of Opportunity accepted on Oct 31, observations of AT2023fhn, which is a follow-up to a Target of Opportunity accepted on Oct 16, an observation of SN2022xxf, which is a follow-up to a Target of Opportunity accepted on Apr 19 and is coordinated with NuSTAR, and an observation of AT2021lwx, which was accepted as a Director's Discretionary Time Target of Opportunity on Jul 6.

        GaiaDR247804394753     ACIS-S       Nov 13
        BD-202976              HRC-I
        NGC1566                ACIS-S
        SPT-CLJ0417-4748       ACIS-S
        HE0230-2130            ACIS-S       Nov 14
        Radiation Belts
        PSOJ030947.49+27175    ACIS-S
        CXOUJ232327.8+58484    HRC-S        Nov 15
        AT2023fhn              ACIS-S
        PSOJ030947.49+27175    ACIS-S
        AT2023fhn              ACIS-S
        MOOJ0346+2003          ACIS-I
        AT2023fhn              ACIS-S       Nov 16
        MOOJ0346+2003          ACIS-I
        SN2022xxf              ACIS-S
        PSRJ0007+7303          ACIS-I
        Radiation Belts                     Nov 17
        HE0230-2130            ACIS-S
        SPT-CLJ0417-4748       ACIS-S
        SDSSJ004719.71+0148    ACIS-S
        PSOJ030947.49+27175    ACIS-S
        HD226868               ACIS-S/HETG  Nov 18
        CXOUJ232327.8+58484    HRC-S
        PSOJ030947.49+27175    ACIS-S
        AT2021lwx              ACIS-S
        CXOUJ232327.8+58484    HRC-S
        PSOJ030947.49+27175    ACIS-S       Nov 19
        HD226868               ACIS-S/HETG
        PSOJ030947.49+27175    ACIS-S
        Radiation Belts


All spacecraft subsystems continued to support nominal operations.

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