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Operations CXO Status Report

Friday 21 September 2018 9.00am EDT

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

A real-time procedure was executed on Sep 14 to de-activate the EPHIN and EPHIN Input/Output (EIO) units. Following the initial spontaneous reset on Aug 20, the unit subsequently underwent a number of additional resets and displayed unstable behavior, likely related to operating at temperatures well above the unit qualification limits. Given that EPHIN was no longer used operationally as a ground or on-board safing monitor, the decision was made to take no further action toward restoring functionality and instead to de-activate the units.

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

Radiation Belts Sep 24 SDSSJ132457.29+4802 ACIS-S ClGJ104513+580833 ACIS-I LSBCF612-01 ACIS-S CHIPS0005-2758 ACIS-I Abell2219 ACIS-I Sep 25 Abell98 ACIS-I Sep 26 Radiation Belts Sep 27 lCar ACIS-I PSZ2G113.91-37.01 ACIS-I Abell98 ACIS-I Sep 28 Abell2219 ACIS-I Radiation Belts Sep 29 PSZ2G028.63+50.15 ACIS-I VHSJ2220-5618 ACIS-S Perseusr200NW ACIS-I Sep 30 Kapteyn'sStar ACIS-S Abell98 ACIS-I SN2013ej ACIS-S


All spacecraft subsystems continued to support nominal operations.

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