To:sot_shift from: Dan Schwartz date: 24 Aug 99, 10:00pm EDT Subject: SOT shift report, Shift M34 -------- See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Aug_24_1999_M34 .txt. Shift M34 Start at 235:18:00 GMT = 02:00pm 24 Aug EDT End 10:00pm 24 Aug SOT Lead DAS Spac/Aspect RAC FOT/Sci liason HRC ACIS PPP,LT (Times will be given in GMT on day 236 . In general times are rough, not precise.) PLAN Finish the "lame duck" activities of the original P7 load, through initiating OBSID 1197. Upload the revised P7, called P7b, and start running under it, picking up with a maneuver to PKS0312-770 and the ACIS-I focus plates. EVENTS 20:21 In OBSID 1197, maneuvering to triangulum Australae Acquire 3 fid lights, 4 stars. 20:30 New P7b load is uplinked, SCS 128 enabled and activated. 20:45 SCS 130 is terminated and disabled, ending original P7 load. 20:55 ACIS stop science is sent and confirmed via real time contact, we are ready for daily load to resume. 21:30 OBSID 1276. ACIS-I acquires PKS0312-770 in center of the 1/8 array. Have 4 stars, 3 fids. Miss an 8.7 mag star 1227622128. We had not included this star in yesterday's pointing at the same location. (WHY?? due to roll?) 23:24 OBSID 1277 Start science run for the second focus position, 0.25mm forward. By crude analysis may have 0.8 arcsec FWHM instead of 1.1 arcsec for 1276, so we guess we are moving the focus in the right direction. BUT if one were rigorous no firm conclusion would be drawn. Same 4 stars and 3 fids are acquired. 23:45 LOS. (Next AOS expected at 237:05:45) NOTES/ISSUES/PROBLEMS PKS0312-77 count rate is about 0.7 per sec, at the first focus offset of 0.5mm. With 0.5 second frame time for the 1/8 array, this image should have significant pileup when in focus. A new graphical timeline was not prepared today, for the revised P7b load. Why wasn't the 8.7 mag star 1227622128 used for the previous pointing at the PKS0312-770 field? If I were a worrier, it would seem that each day we fail to acquire on brighter stars. We hear that the OFLS will fix the problem with the SIM offset and fid light acquisition, on either Wed or Fri (from different sources). Either would be okay, as the HRC observations have been deferred from P8 load into P9. Meeting on initial HETG insertion and retraction was held 3pm EDT today. Real time commands will be sent to release launch locks and insert gratings during the 12000 sec observation 1098 on Capella. This will be followed by ~40 hours of activities, including observations of Capella and the Crab. Return to Capella for the 10000 sec observation OBSID 1199, remove the grating via realtime command, then insert and remove the grating via software command (i.e., commands sent through the OBC, as they will be done in normal mission). We will disable safing actions for momentum monitor, position and rate error monitors, during the grating motions. However, we will leave the monitors enabled so we can see if they trip. They are not expected to trip, and we therefore expect to leave safing actions enabled in the normal mission. ------------------------------------------------------- Dan Schwartz, MS #3 das@head-cfa.harvard.edu phone: (617)495-7232 FAX: (617)495-7356 cell phone: (617)512-5627 pager: 800-759-8352 PIN 1636502 or e-mail 1636502@skytel.com -------------------------------------------------------