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Operations CXO Status Report

Friday 19 September 2014 9.00am EDT

During the last week the radiation environment recovered enough following the high-radiation event of Sep 12 to resume operations. A replanned schedule for resuming science observations was uplinked on Sep 13 with 88.0ks of science loss. The replanned schedule is shown below and includes a time-constrained observation of Eta Carinae. Observations of 3C292, 3C277, and SDSS J111729.22+6140 were impacted by the interruption will be rescheduled in future weeks.



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30Doradus ACIS-I Sep 13 UGC12491 ACIS-S Radiation Belts Sep 14 3C220.3 ACIS-S Sep 15 2XMMJ141711.0+52254 ACIS-S EtaCarinae ACIS-S ArLac (21 obs) HRC-I Sep 16 ArLac (21 obs) HRC-S M31BHXNe ACIS-I Q0000-263 ACIS-S G296.41-32.48 ACIS-I Sep 17 Radiation Belts G106.73-83.22 ACIS-I SN1987A ACIS-S/HETG ESO153-G003 ACIS-S Sep 18 RXJ1324.7-5736 ACIS-S HD93030 ACIS-S/HETG Sep 19 NGC7717 ACIS-S Radiation Belts SN1987A ACIS-S/HETG Sep 20 NGC682 ACIS-S ------------------------------------------ Since resumption Chandra has completed the observing schedule as planned. A real-time procedure was executed on Sep 12 to disable SCS-29, which was enabled during the safing sequence. A real-time procedure was executed on Sep 15 to temporarily turn on the ACIS detector assembly housing heater, to verify whether a cold ACIS focal plane is possible with the heater on. The heater has been off since 2008 Apr 7. The heater was turned off via commands in the daily command loads on Sep 16. A Chandra press release was issued on Sep 16 as a NASA press release describing observations of WASP-18, a giant planet that appears to be weakening the magnetic field of the star it closely orbits. WASP-18 is over ten times Jupiter's mass but is so close to its star that it completes an orbit in less than a day. The extreme tidal forces by this "hot Jupiter" are apparently changing the internal structure of the star. Chandra data show the star is acting much older than the age astronomers estimate it to be. For details see: http://chandra.si.edu/press/14_releases/press_091614.html The schedule of targets for the next two weeks is shown below and includes observations of GRB140903A and IGR J17451-3022, which were accepted as a Targets of Opportunity on Sep 8 and 16 respectively. ------------------------------------------ 47Tuc ACIS-S Sep 21 GRB140903A ACIS-S SDSSJ230703.75+0113 ACIS-S Sep 22 Radiation Belts ChandraDeepField-S ACIS-I Sep 23 PSRJ1509-5850nebul ACIS-I WR122 ACIS-I Sep 24 SDSSJ230703.75+0113 ACIS-S Radiation Belts Sep 25 ChandraDeepField-S ACIS-I 3C34 ACIS-S 3C247 ACIS-S Sep 26 Abell2256 ACIS-I Abell2345 ACIS-I ACT-CL_J2154-0049 ACIS-I Radiation Belts Sep 27 ChandraDeepField-S ACIS-I Sep 28 NGC682 ACIS-S IGRJ11014-6103 ACIS-I Sep 29 IGRJ17451-3022 HRC-S RXJ1856.5-3754 ACIS-S/LETG HD93030 ACIS-S/HETG Radiation Belts Sep 30 47Tuc ACIS-S ChandraDeepField-S ACIS-I Oct 1 IGRJ11014-6103 ACIS-I 47Tuc ACIS-S Oct 2 IGRJ11014-6103 ACIS-I ChandraDeepField-S ACIS-I Radiation Belts Oct 3 ChandraDeepField-S ACIS-I NGC682 ACIS-S Oct 4 J002434.9+325842 ACIS-S HD206267 ACIS-S/HETG Oct 5

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All spacecraft subsystems continued to support nominal operations.

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