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Operations CXO Status Report

Friday 23 January 2026 9.00am EST

During the last week, the observing schedule was interrupted due to a radiation monitor threshold violation. The loads were autonomously halted at 4:52 am EDT on Jan 19 by the ACIS radiation monitor through execution of SCS 107 for SI safing. All spacecraft actions were nominal. A real-time procedure was executed on Jan 19 to change the ObsID. Loads for a replanned schedule were uplinked on Jan 21. Planned observations that were impacted by the interruption will be rescheduled.

Chandra passed through the 3rd and 4th eclipses of the season on Jan 18 and 21, respectively, with nominal power and thermal performance.

The schedule of targets for the next week is shown below and includes observations of the Orion Nebula coordinated with JWST, and an observation of GRB260114A, which is a follow-up to a Target of Opportunity accepted on Jan 15.



------------------------------------------
        GaiaDR267500740681     ACIS-S       Jan 25
        GRB260114A             ACIS-S
        Radiation Belts                     Jan 26
        ZwCl0857.9+2107        ACIS-S
        HerculesA              ACIS-S
        ZwCl0857.9+2107        ACIS-S       Jan 27
        2MASXJ13435300+8035    ACIS-S
        X-rayblanksky          HRC-S
        NGC5134                ACIS-S
        ZwCl0857.9+2107        ACIS-S
        PSZ2G071.21+28.86      ACIS-I       Jan 28
        Perseuscluster         ACIS-I
        NGC2622                ACIS-S
        Radiation Belts                     Jan 29
        ZwCl0857.9+2107        ACIS-S
        PSZ2G071.21+28.86      ACIS-I
        Perseuscluster         ACIS-I
        XIBOO                  HRC-I        Jan 30
        CenterofCOSMOS-Web     ACIS-I
        HerculesA              ACIS-S
        RMJ082409.6+192443.9   ACIS-I
        PJ011646               ACIS-I
        Perseuscluster         ACIS-I       Jan 31
        Radiation Belts                     Feb  1
        OrionNebulasnapsho     ACIS-I
        2RXSJ083147.5+05450    ACIS-S
        PJ011646               ACIS-I
        OrionNebulasnapsho     ACIS-I
        ESO221-009             ACIS-S
        OrionNebulasnapsho     ACIS-I

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

All spacecraft subsystems except HRC-S continued to support nominal operations.

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