To:sot_shift from: Dan Schwartz date: 29 Jun 00 , 12:00noon EDT Subject: SOT shift report 2000-06-29 L342 -------- See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Jun_29_2000_L342.txt. Shift L342. Start at 181:12:00 GMT = 08:00am 29 Jun EDT End 12:00 noon 29 Jun SOT Lead DAS (Times will be given in GMT on day 181. In general times are rough, not precise.) PLAN Continue running load JUN2500d. Performing OBSID 874, a long ACIS-I observation of the blazar 1156+295. Then we do ACIS-S observations of the low luminosity AGN NGC 4565, OBSID 4004; of the globular cluster NGC 6121, OBSID 946; and of Kepler's Supernova remnant, OBSID 116. Next Comms: 181:17:50 to 19:50 182:03:50 to 05:50 182:11:55 to 13:55 182:20:00 to 21:45 183:07:00 to 08:00 183:15:20 to 16:20 183:23:40 to 01:40 184:08:15 to 09:15 184:17:55 to 18:55 EVENTS Status at LOS, 181:09:59, was as follows: PCAD MODE = NPNT CONTROL LAW FLAG = NPNT Stars: = 5 FIDS = 3 RA = 179.870 deg DEC = 29.267 deg ROLL = 253.093 deg Format = 2 OBSID = 874 (1156+295) SIM FA = -535 SIM TSC = 92904 (ACIS-I) HETG = OUT (80.2 deg) LETG = OUT (78.3 deg) HRC-S HV is ON EPHIN: A-Leak = 0.4160 mu-a B-Leak = 0.0680 mu-a The ACIS GSE, pmon, shows proper behaviour of FEPs 0 and 3 (and all others) during this pass. fep 0 1 2 3 4 5 chip S2 S3 I3 I2 I1 I0 thresholds 10935 303 9900 13744 8203 10420 filtered 465 46 423 521 431 496 events 8 16 22 25 4 18 ACIS focal plane temperature read -119.9C No comm pass this shift. NOTES/ISSUES/PROBLEMS Many thanks to the FOT/SOC for getting unscheduled comm with Goldstone, which enabled running a CAP to clear up and verify the ACIS FEP anomaly. This potentially saved one or more days of science observation. From the 9am status meeting: Comm was lost on DSS-66 about 50 min after acquisition, and could not be reacquired. Switched to DSS-24 to execute part of ACIS diagnostic CAP 626 (see SOT Shift report H342). Last segment of JUN2500 load was uplinked, we are good until 184:23:54. There was a problem flowing data through SQUIRT to the SI GSE machines. This was traced to a firewall configuration issue, and fixed. The TDRSS-H launch slip has caused some re-arrangement of DSN contact schedules. We have adequate contacts, but the implications may be we need to command transmitters ON or OFF, and may take momentary "hits" when the daily load commands transmitter operations at times previously scheduled. Mission planning reviewed JUL0200 yesterday. There will be a review today at 1pm with some updated momentum dumps and star catalog edits, and which is expected to give final approval. The JUL0900 planning is complicated by scheduling the comet observations. The moving target ephemeris feature of the OFLS gives pointing directions which seem to be significantly off -- B. Davis of CSC is investigating. Products will probably not be released in time for the first review to be earlier than next Wed, July 5, (since we don't plan to have a review on the July 4 holiday). OFLS 9.0 is installed on the 3rd string, and testing is starting. The OBSID 371 was carried out at 178 deg pitch angle. Not surprisingly, some temperature warning limits tripped, and some heaters not normally used came on. The aspect solution and all X-ray data appear good (except for the unrelated ACIS FEP anomaly noted elsewhere). Quick look data: OBSID Target Time ----- ------ -------------- 371 PKS 1830-211 178:12:39 ACIS-S/HETG 659 SS 433 (EAST JET) 179:03:53 ACIS-S 861 Q2345+007 179:07:28 ACIS-S 795 NGC 1291 179:22:15 ACIS-S 443 PICTOR A 180:09:41 ACIS-S Comments on all: The above were all affected by the "Threshold-plane Lock-out" anomaly. This caused data to be lost from FEP0 and FEP3, and for high rates saturating telemetry which caused substantial dead time. FEP 1 was assigned to the target chip in all cases, and the target seems to be properly observed in all cases. Because PICTOR A was observed using only one chip, and with a subarray, it appears to have NO deleterious effects due to the anomaly. ------------------------------------------------------- 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 -------------------------------------------------------