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Operations CXO Status Report

Friday 12 December 2025 9.00am EST

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

Real-time procedures were executed on Dec 10 to conduct a checkout of the HRC-I, using the side-A electronics and including an 11 ks observation of a celestial target. This is a key step to returning the HRC-I to service following the HRC anomaly on Oct 24. The HRC team is evaluating the data.

Chandra press and image releases were issued on Dec 11 describing observations of over 1600 galaxies. The key finding of the study is that smaller galaxies lack central X-ray sources. The researchers considered two possible explanations for this. The first is that the fraction of galaxies containing massive black holes is much lower for less massive galaxies. The second is the amount of X-rays produced by matter falling onto these black holes are so faint that Chandra cannot detect them. The group concludes the most likely reason is an actual dearth of black holes in smaller galaxies. For details, see: https://chandra.harvard.edu/press/25_releases/press_121125.html

The schedule of targets for the next week is shown below.



------------------------------------------
        Radiation Belts                     Dec 15
        ZTFJ0546+3843          ACIS-S
        GRB221009A             ACIS-S
        HEPG173.810-01.525     ACIS-I
        GRB221009A             ACIS-S
        HEPG173.766-01.783     ACIS-I       Dec 16
        GRB221009A             ACIS-S
        Perseuscluster         ACIS-I
        GRB221009A             ACIS-S
        IRAS04416+1215         ACIS-S
        6dFGSgJ031612.2-380    ACIS-S       Dec 17
        Radiation Belts
        CenterofCOSMOS-Web     ACIS-I       Dec 18
        CenterofCOSMOS-Web     ACIS-I
        NGVSJ122636.42+1255    ACIS-S
        B2.40553+23            ACIS-S
        GW170817               ACIS-S       Dec 19
        IRAS04416+1215         ACIS-S
        SDSSJ160318.74+1809    ACIS-S
        IRAS04416+1215         ACIS-S
        ACT-CLJ0223.9-3921     ACIS-S
        Radiation Belts                     Dec 20
        Perseuscluster         ACIS-I
        IIZw171                ACIS-S
        Perseuscluster         ACIS-I       Dec 21
        PG2304+042             ACIS-S
        Perseuscluster         ACIS-I
        SDSSJ233504.22-08450   ACIS-S
        Perseuscluster         ACIS-I
        CenterofCOSMOS-Web     ACIS-I

------------------------------------------

All spacecraft subsystems except HRC continued to support nominal operations.

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