To:sot_shift from: Dan Schwartz date: 21 Jul 00, 12:00noon EDT Subject: SOT shift report 2000-07-21 L364 -------- See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Jul_21_2000_L364.txt. Shift L364. Start at 203:12:00 GMT = 08:00am 21 Jul EDT End 12:00 noon 21 Jul SOT Lead DAS (Times will be given in GMT on day 203. In general times are rough, not precise.) PLAN Continue running load JUL1700. Perform OBSID 636, an ACIS-S/HETG observation of the intermediate mass Supergiant star HD 45348. The remainder of this week's load will entail a radiation belt passage, OBSID 812 will be a long ACIS-S/HETG observation of the narrow line Seyfert 1 galaxy PG 1404+226, and OBSID 729 is an ACIS-S observation of the composite supernova remnant KES 73. Next Comms 203:15:20 to 16:20 204:00:10 to 02:10 204:10:00 to 11:00 204:17:00 to 18:20 205:03:00 to 04:00 205:10:10 to 11:50 205:19:50 to 21:50 HETG retraction in on-board load. ORBITAL EVENTS: 2000:203:07:13:52.793 132 EAPOGEE ORBIT APOGEE 2000:204:14:57:49.172 132 EPERIGEE ORBIT PERIGEE 2000:205:22:41:52.547 133 EAPOGEE ORBIT APOGEE 2000:207:06:25:37.246 133 EPERIGEE ORBIT PERIGEE EVENTS Status at LOS, 203:08:24, was as follows: PCAD MODE = NPNT CONTROL LAW FLAG = NPNT Stars: = 5 FIDS = 3 RA = 96.027 deg DEC = -52.690 deg ROLL = 156.159 deg Format = 2 OBSID = 636 HD 45348 SIM FA = -467 SIM TSC = 75623 (ACIS-S) HETG = IN ( 6.3 deg) LETG = OUT (78.3 deg) HRC-I HV is ON (NOTE: snapshot and shift report now give EPHIN rates in physical units, previously was in counts per readout.) EPHIN Geom = LARG E1300 = 0.2 LT 10.0 (RADMON P4GM = 3.9 LT 300. Triggers) P41GM = 0.0 LT 8.47 A-leak = 0.6280 mu-a B-leak = 0.1120 mu-a Descending through 143465 km. ACIS focal plane temperature -119.9. 15:33 AOS. Descending through 136766 km. Status essentially unchanged. 16:20 AOS. Status essentially unchanged (but see note on ACA multiple star flags). NOTES/ISSUES/PROBLEMS Ephin rates continue a very slow decline. ACE proton fluxes back down around the 1000 per (cm2-s-ster-MeV) level, a flux level that could be tolerated indefinitely even without the grating, but still a factor of 100 above quiescent levels. For OBSID 636 we are getting multiple star flags for slots 5,6, and 7. Occasionally slot 6 is lost. These are all faint stars, less than 2000 counts. At least slot 6 looks like it has a warm pixel which will upset the centroid position. From the 9am status meeting: Analysis of the "legacy" data processed through the DSN old equipment does not show the problems encountered from the new automation equipment. Debug is in progress by JPL. The JUL2300 load was approved for uplink. Second week of Aug, probably Aug 7, is to be scheduled for an on-orbit demonstration of the products needed for next October's lunar eclipse. This will include an offsetting of the solar arrays from being normal to the sun. 3rd string has been restored to operational configuration following yesterday's system work. This work allowed CSC and Lockheed access to the 3rd string. Continuity to the HRC, ACIS, and ACA GSE has all been verified as of the 203:15:20 to 16:20 comm period. There will be a review meeting at 2pm in the Action Room to go over the 4:50pm EDT Sunday HETG retraction. This retraction will be commanded through the on-board stored command loads. Summary from the radiation safing debrief meeting: There is no discernable damage in any on-board system. ACIS reports no CTI degradation. We lost the minimum observing time which was forced by the high radiation environment. No additional times were lost due to any lags in rebuilding or uplinking loads. We implemented several minor adjustments in the details of our automatic warning messages, and in email paging lists. In our decision process we really counted on the advice and predictions of the outside magnetospheric and solar physicists whom Steve O'Dell has brought in for consultation. We need to know not only the current conditions which can be assessed with ACE, GOES, Kp, and other measurements, but also what is likely to take place in the interval until the next comm pass, e.g., based on solar activity over the past day or two. Quick look data: OBSID Target Time Comment ----- ------ -------------- ------- 701 X0918-54 201:00:13 ACIS-S/HETG Looks good. ------------------------------------------------------- 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 -------------------------------------------------------