To:sot_shift from: Dan Schwartz date: 24 Oct 03, 12:00noon EDT Subject: SOT shift report 2003-10-24 L1555 -------- See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Oct_24_2003_L1555.txt. Shift L1555. Start at 297:12:00 GMT = 08:00am 24 Oct EDT End 11:00am 24 Oct SOT Lead DAS (Times will be given in GMT on day 297.) PLAN ---- Continue running load OCT2003B. Finish obsid 3732, an HRC-I observation of the T Tau N/S system to resolve the two components, correlated with VLBI radio observations. Then do 4157, an ACIS-S observation of the radio/optical/x-ray jet in 3C 78. Next Comms: 297:1315 to 1415 297:2045 to 2145 298:0345 to 0445 298:1215 to 1315 298:1815 to 1915 299:0345 to 0445 299:1315 to 1415 299:2030 to 2130 300:0400 to 0500 300:1315 to 1415 300:2030 to 2130 301:0025 to 0225 301:1105 to 1205 301:2030 to 2130 Orbital events: 2003:299:22:32:22.806 583 EAPOGEE ORBIT APOGEE 2003:301:06:16:07.596 583 EPERIGEE ORBIT PERIGEE 2003:302:13:59:15.020 584 EAPOGEE ORBIT APOGEE 2003:303:21:43:31.304 584 EPERIGEE ORBIT PERIGEE 2003:305:05:26:58.729 585 EAPOGEE ORBIT APOGEE 2003:306:13:10:34.451 585 EPERIGEE ORBIT PERIGEE 2003:307:20:54:45.086 586 EAPOGEE ORBIT APOGEE 2003:309:04:38:07.561 586 EPERIGEE ORBIT PERIGEE 2003:310:12:22:40.962 587 EAPOGEE ORBIT APOGEE 2003:311:20:06:32.771 587 EPERIGEE ORBIT PERIGEE EVENTS ------ Status at LOS, 297:05:02, was as follows: PCAD MODE = NPNT CONTROL LAW FLAG = NPNT Stars: = 5 FIDS = 3 RA = 164.831 deg Dec = 24.524 deg ROLL = 54.416 deg Format = 2 OBSID = 3952 IRAS 10565+2448 SIM FA = -467 SIM TSC = 75623 (ACIS-S) DITHER = ENAB HETG = OUT (79.46 deg) LETG = OUT (77.59 deg) HRC-I HV is ON EPHIN Geom = LARG E150 = 102.9 E300 = 1.7 E1300 = 0.1 LT 10.0 (RADMON P4GM = 33.7 LT 300. Triggers) P41GM = 0.0 LT 8.47 A-leak = 1.0200 mu-a B-leak = 0.4800 mu-a Ascending through 129018 ACIS focal plane temperature -119.7. 13:15 AOS expected Status at AOS, 297:13:17, was as follows: PCAD MODE = NPNT CONTROL LAW FLAG = NPNT Stars: = 5 FIDS = 3 RA = 65.511 deg Dec = 19.515 deg ROLL = 96.756 deg Format = 1 OBSID = 3732 T Tau SIM FA = -715 SIM TSC = -50504 (HRC-I) DITHER = ENAB HETG = OUT (79.46 deg) LETG = OUT (77.59 deg) HRC-I HV is ON EPHIN Geom = LARG E150 = 92.4 E300 = 1.2 E1300 = 0.0 LT 10.0 (RADMON P4GM = 44.4 LT 300. Triggers) P41GM = 0.0 LT 8.47 A-leak = 1.0200 mu-a B-leak = 0.5840 mu-a Descending through 125806 km. ACIS focal plane temperature -119.7. 13:34 Run SCS 107 via ground command. ACE proton flux above 120,000 Status at LOS, 297:14:14, was as follows: PCAD MODE = NPNT CONTROL LAW FLAG = NPNT Stars: = 5 FIDS = 0 RA = 65.521 deg Dec = 19.520 deg ROLL = 96.752 deg Format = 1 OBSID = 3732 T Tau SIM FA = -715 SIM TSC = -99616 (HRC-S) DITHER = ENAB HETG = OUT (79.46 deg) LETG = OUT (77.59 deg) HRC-I HV is ON EPHIN Geom = LARG E150 = 86.6 E300 = 1.3 E1300 = 0.1 LT 10.0 (RADMON P4GM = 35.0 LT 300. DISABLED) P41GM = 0.0 LT 8.47 A-leak = 1.0200 mu-a B-leak = 0.5760 mu-a Descending through 124608 km. ACIS focal plane temperature -119.7. NOTES/ISSUES/PROBLEMS Daylight saving time ends at 2am EDT on Sunday Oct 26, which is 299:06:00 GMT. Subsequently GMT will be 5 hours ahead of EST. Radiation Shutdown. SCS 107 run by command at ~ 297:13:34 GMT. At the 09:15 (EDT) radiation telecon we noted ACE rates above 120,000. This would exceed ACIS fluence budget, even for the interval from next ACIS observation to the next following COMM opportunity. Furthermore, a shock wave and at least one more CME is on the way, so we can anticipated an extended period of high rates, perhaps even for 2 more days. For the HRC observation 3732 in progress, background is about 3 times normal, and we are guessing this will not compromise the primary objective of separating the emission from the two components. This observation received about 85% of its awarded time. As a replan A, FOT/MP will build products to resume observing with obsid 3908, at 298:22:45, upon perigee egress (and including the egress ACIS CTI measurement). Products expected out late today, with an announcement of when the load review will occur (tonight or 9am tomorrow, depending on when products are available today). We will have a radiation assessment telecon at 9am EDT tomorrow, on 305 503 1818 code 421, to discuss the likelihood of using Plan A and whether to proceed building Plan B products. Currently plan B would start with the HRC-I observation 3713 at 299:15:48. From the 9am status meeting: Three supports over the past 24 hours. DSS-54 was not able to downlink TM. OC arranged switch to DSS-16 and dumped enough to avoid SSR rollover. Subsequently caught up on SSR playback. Uplinked one command load segment, to complete the OCT2003B week. Onboard loads were good until 299:21:21 -- but as noted above we have stopped the observing sequence. Heads-up on Leonids: there are 4 distinct peaks predicted, on Nov 13, 18, 19, and 23. Total fluence exceeds dose limit which requires SI to be turned off -- but we question on excess over background, and whether we only need to turn off for the highest individual peak. FOT/MP will take plan to Flight Director CCB next week. Quick look data: OBSID Target Time Comment ----- ------ -------------- ------- 5190 XTE J1550-564 296:07:32 ACIS-S NONE Looks good 3952 IRAS10565+2448 296:21:50 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 -------------------------------------------------------