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Operations CXO Status Report

Friday 24 August 2018 9.00am EDT

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

At 9:36pm EDT on Aug 20 the EPHIN and EPHIN Input/Output (EIO) units spontaneously reset. After examining real-time and recorder dump telemetry the engineering team concluded that the reset was most likely due to a single event upset. Because the EPHIN is no longer used operationally as a ground or on-board safing monitor, no immediate commanding response was required. Real-time procedures will be developed and executed to restore EPHIN and EIO to their nominal operating configuration. There was no loss of science time due to the reset.

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



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VTC0107+0112 ACIS-S Aug 26 LSBCF750-04 ACIS-S P308-21 ACIS-S Aug 27 1E1207.4-5209 ACIS-S Radiation Belts Aug 28 P308-21 ACIS-S Aug 29 SDSSJ160111.25+4745 ACIS-S PSRJ1809-1917 ACIS-I Aug 30 P308-21 ACIS-S Radiation Belts Aug 31 SN2011dh ACIS-S CentaurusA ACIS-I PSRJ1809-1917 ACIS-I Sep 1 1RXSJ174537.3+395128 ACIS-I ClGJ223533+183352 ACIS-I Q0000-263 ACIS-S RXJ0806 HRC-I SDSSJ000904.54-1034 ACIS-S Sep 2 LSBCF743-01 ACIS-S SDSSJ1522+2535 ACIS-I Radiation Belts

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All spacecraft subsystems continued to support nominal operations.

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