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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. |
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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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Revised: July 08, 2022