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Operations CXO Status Report

Friday 20 January 2017 9.00am EST

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

On Sunday, Jan 15 it was discovered during a real-time pass that the Control Processing Electronics (CPE) Error log counter had unexpectedly incremented by 5 counts. A real-time activity was performed to dump the CPE diagnostic memory. This showed that the CPE had not reset but had experienced out of sync telemetry. Subsequent inspection of recorded telemetry revealed a concurrent single sample of out-of-state values for a number of MSIDs related to pointing control and propulsion. Analysis of this event is on-going, with initial focus on the possibility of a single event upset in the Input Output Electronics. There was no impact to spacecraft health and safety nor any loss of science observing time.

Real-time procedures were executed on Jan 13 to disable SCS-29, and to dump and clear the EPS glitch counters as post-eclipse season actions.

A Chandra image release was issued on Jan 18 describing deep Chandra X-ray Observatory exposures of two nearby energetic pulsars flying through the Milky Way galaxy. The shape of their X-ray emission suggests there is a geometrical explanation for puzzling differences in behavior shown by some pulsars. For details see: http://chandra.harvard.edu/photo/2017/geminga/.

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



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SDSSJ112614.93+31014 ACIS-S Jan 23 SDSS1004+4112 ACIS-S Radiation Belts Jan 24 M81S ACIS-I M81N ACIS-I SDSSJ113923.66+00230 ACIS-S Jan 25 IGRJ17096-2527 ACIS-I SDSSJ1030+0524 ACIS-I SDSSJ131627.84+31582 ACIS-S CygnusA-Nucleus ACIS-I Jan 26 Radiation Belts M81S ACIS-I SDSSJ113327.78+03271 ACIS-S Jan 27 SDSSJ1030+0524 ACIS-I IGRJ17118-3155 ACIS-I SDSSJ1030+0524 ACIS-I SDSSJ112224.15+03180 ACIS-S Jan 28 M81S ACIS-I CygnusA-Nucleus ACIS-I Radiation Belts Jan 29 M81N ACIS-I

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All spacecraft subsystems continued to support nominal operations.

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