To:sot_shift from: Dan Schwartz date: 23 Jun 00 , 2pm EDT Subject: SOT shift report, Shift L336 -------- See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Jun_23_2000_L336.txt. Shift L336. Start at 175:12:00 GMT = 08:00am 23 Jun EDT End 2pm 23 Jun SOT Lead DAS (Times will be given in GMT on day 175. In general times are rough, not precise.) PLAN Continue running load JUN1800c. Egress from perigee, perform CTI measurement, then do ACIS-I measurements of Abell 1413, OBSID 537, to study the Sunyaez-Zeldovich effect; and of the BD Cluster 1338 of galaxies, OBSID 920, to study the interaction of a bent-double radio galaxy with the intergalactic medium. Next Comms: 175:15:30 to 17:30 176:01:30 to 02:30 176:10:30 to 11:30 176:19:30 to 20:30 177:04:30 to 05:30 177:13:25 to 14:55 178:00:15 to 01:15 EVENTS Status at LOS, 175:07:29, was as follows: PCAD MODE = NPNT CONTROL LAW FLAG = NPNT Stars: = 5 FIDS = 0 RA = 140.988 deg DEC = -61.548 deg ROLL = 223.734 deg Format = 2 OBSID = 62018 (ACIS CTI) SIM FA = -467 SIM TSC = -99616 (HRC-S) HETG = OUT (80.2 deg) LETG = OUT (78.3 deg) HRC-S HV is ON EPHIN: A-Leak = 0.3480 mu-a B-Leak = 0.0560 mu-a Descending through 62003 km. ACIS focal plane temperature -119.9 130-214 keV proton fluxes: 12:00 66,300 13:00 209,000 14:00 148,000 15:00 177,000 16:00 206,000 17:00 170,000 15:30 Do NOT get TM lock from DSS-66. (Command link is established.) 16:35 Start getting some intermittant TM from DSS-66, but still no lock. 16:45 Get TM lock. Ascending through 51195 km. 17:02 try SSR playback again. NOTES/ISSUES/PROBLEMS There is currently a large solar proton event. Fluxes have been rising steadily for about 23 hours. We are at perigee, at the HRC-S position, so ACIS is not currently receiving any dosage. We move to ACIS-I position at about 20:46 GMT today, that is 4:46pm EDT. Our next two comms are 15:30 and 01:30 GMT, that is 11:30am and 9:30pm EDT today. A telecon was held at 10:30 EDT to plan a course of action. It was decided to tag up again at 11:45, and look at some ephin data. But due to lack of TM lock, an additional pass with DSS-54 was obtained for 21:05 GMT (5:05pm EDT). An M-class solar flare went off ~14:30, so we are pessimistic that we will be able to continue the load. CURRENT DECISION is for a telecon at 20:00 GMT, 4pm EDT. Ken Gage notes that the perigee position is good for several orbits, but either of the next two targets, OBSID 537 or 920, would require a maneuver before the next perigee to avoid earth in the field of view. A "Level 2" meeting was held yesterday which approved the manual insertion and retraction of the HETG to perform OBSID 371 of PKS 1830-211. This is a gravitationally lensed quasar, which requires a grating to avoid pulse pile up, and for which the roll angle required to split the two images only occurs one day a year since it is almost exactly in the ecliptic plane. Telemetry doesn't come up promptly at 15:30 from DSS-66. Looks like "the same problem we had yesterday." This was with receivers, but they have already changed receivers with no luck. From the 9am status meeting: JUL0200 is progressing, hope for a review on Monday but there are some difficulties and this might not happen. There will be a CAP review at 3pm today for the HETG manual insertion and retraction operations scheduled for 178:00:15 and 179:02:00, respectively. Quick look data: OBSID Target Time Comment ----- ------ -------------- ------- 103 GX 301-2 171:14:20 ACIS-S/HETG Looks good. 354 M51 172:08:23 ACIS-S Looks good. 118 0519-69.0 173:06:48 ACIS-S Looks good. 1735 PSR B0540-69 173:21:09 HRC-I (cal) Looks good. 1736 PSR B0540-69 174:00:03 HRC-I (cal) Looks good. 1741 PSR B0540-69 174:02:56 HRC-I (cal) 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 -------------------------------------------------------