To:sot_shift from: Dan Schwartz date: 04 Apr 02, 12:00noon EST Subject: SOT shift report 2002-04-04 L987 -------- See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Apr_04_2002_L987.txt. Shift L987. Start at 094:13:00 GMT = 08:00am 04 Apr EST End 12:00 noon 04 Apr SOT Lead DAS (Times will be given in GMT on day 094.) PLAN ---- Continue running load APR0302C. Finish an ACIS-S observation of the nearby radio galaxy NGC 4410A, obsid 2982. Then maneuver and observe the X-ray emitting late B-type star HD133880 with ACIS-I, obsid 2543, prior to perigee passage. No Comm this shift. Next Comms: 094:1730 to 1830 095:0230 to 0330 095:1100 to 1300 095:2100 to 2200 096:0500 to 0600 096:1500 to 1600 096:2230 to 2330 097:0720 to 0920 097:1740 to 1840 Orbital events: 2002:095:01:53:02.677 367 ORBIT PERIGEE 2002:096:09:36:13.313 368 ORBIT APOGEE 2002:097:17:20:21.888 368 ORBIT PERIGEE 2002:099:01:03:45.984 369 ORBIT APOGEE 2002:100:08:47:09.593 369 ORBIT PERIGEE EVENTS ------ Status at LOS, 094:09:58, was as follows: PCAD MODE = NPNT CONTROL LAW FLAG = NPNT Stars: = 5 FIDS = 3 RA = 186.626 deg Dec = 9.038 deg ROLL = 202.580 deg Format = 2 OBSID = 2982 NGC 4410A SIM FA = -467 SIM TSC = 75623 (ACIS-S) HETG = OUT (79.46 deg) LETG = OUT (77.96 deg) HRC-S HV is ON EPHIN Geom = LARG E1300 = 0.0 LT 10.0 (RADMON P4GM = 0.1 LT 300. Triggers) P41GM = 0.0 LT 8.47 A-leak = 0.7800 mu-a B-leak = 0.1480 mu-a Descending through 110635 km. ACIS focal plane temperature -119.7. NOTES/ISSUES/PROBLEMS From the 9am status meeting: All three segments of the APR0302C load were uplinked, on-board loads good through the end of the week, 093:0213. APR0802C products are out, in continuity with APR0302C, for a load review telecon at 1pm EST today. Tomorrow, 8am--3pm EST, the GOT will perform the quarterly backups and reboots. From 6--10amEST the transition to Greta 1.2.1 will be initiated. Telecon at 4pm EST today, on 405-244-5060 (PIN 1165#), to discuss increasing the glitch limit for the EPHIN and EIO hardware failure flags from 1 to 5. This has the effect of requiring 3 missed cycles for the OBC to declare a failure, rather than the present case of only one missed cycle. We will run CAP 750B during the perigee pass comm 095:0230 to 0330, to dump the EPHIN and EIO counters and error counts, for potential diagnostic purposes. The error counts may randomly be either 0 or 1, so it is not clear that we can definitely learn anything, but there could be a surprise (and perhaps a serious problem?) e.g., if the counts read 2 or more. LOOK AHEAD: Daylight savings time is coming. At 1am EST next Sunday, April 6, which is day 096:0600GMT, we set clocks in Cambridge MA to be 2am EDT. Subsequently GMT will be only 4 hours ahead of local time. LOOK WAY AHEAD: VCDU roll over on 2002:114:05:03:03. Quick look data: OBSID Target Time Comment ----- ------ -------------- ------- 2819 VELA PWN 093:16:03 ACIS-S NONE Looks good 2118 1WGA_J1220.6+3347 093:22:37 ACIS-S NONE 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: 877-693-7198 PIN 693-7198 or e-mail 6937198@archwireless.net -------------------------------------------------------