To:sot_shift from: Dan Schwartz date: 20 Jun 03, 12:00noon EDT Subject: SOT shift report 2003-06-20 L1429 -------- See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Jun_20_2003_L1429.txt. Shift L1429. Start at 171:13:00 GMT = 08:00am 20 Jun EDT End 12:00 noon 20 Jun SOT Lead DAS (Times will be given in GMT on day 171.) PLAN ---- Continue running load JUN1603C. Go through perigee, and measure ACIS cti on egress. Next Comms: 171:2010 to 2210 172:0200 to 0400 172:0915 to 1115 172:2100 to 2200 173:0545 to 0645 173:1220 to 1420 173:2120 to 2220 174:1035 to 1135 174:2155 to 2255 175:0300 to 0400 175:1150 to 1250 175:2100 to 2200 Orbital events: 2003:171:16:35:40.389 534 EPERIGEE ORBIT PERIGEE 2003:173:00:19:52.134 535 EAPOGEE ORBIT APOGEE 2003:174:08:03:53.709 535 EPERIGEE ORBIT PERIGEE 2003:175:15:48:13.446 536 EAPOGEE ORBIT APOGEE 2003:176:23:32:52.194 536 EPERIGEE ORBIT PERIGEE 2003:178:07:16:56.162 537 EAPOGEE ORBIT APOGEE 2003:179:15:02:09.967 537 EPERIGEE ORBIT PERIGEE 2003:180:22:45:43.478 538 EAPOGEE ORBIT APOGEE EVENTS ------ Status at LOS, 171:11:53, was as follows: PCAD MODE = NPNT CONTROL LAW FLAG = NPNT Stars: = 6 FIDS = 0 RA = 299.999 deg Dec = 34.001 deg ROLL = 147.857 deg Format = 2 OBSID = 60686 perigee SIM FA = -467 SIM TSC = -99616 (HRC-S) DITHER = ENAB HETG = IN ( 6.34 deg) LETG = OUT (77.59 deg) HRC-I HV is ON EPHIN Geom = LARG E150 = 1986.3 E300 = 6.3 E1300 = 0.1 LT 10.0 (RADMON P4GM = 13.8 LT 300. Triggers) P41GM = 0.0 LT 8.47 A-leak = 1.0200 mu-a B-leak = 0.2280 mu-a Gyro 1 Curr 1 134.40 Gyro 1 Curr 2 100.80 Descending through 52747 km. ACIS focal plane temperature -119.7. NOTES/ISSUES/PROBLEMS From the 9am status meeting: Four supports, no issues. All dump data is current. Uplinked first segment of JUN2303B, on-board loads good until 175:07:20. Tripped some thermal yellow limits yesterday due to the large pitch angle in conjunction with running two IRU packages. IRU A1 current has become much less noisy, at around 135ma. At a telecon yesterday there was a concensus to switch to IRU B expeditiously. This means a few weeks in practice, as we will try to find a long comm opportunity at perigee passage and in normal (or at least reasonable) working hours, and then build that week's load appropriately. Eric notes that the calibration of IRU 2 is sufficiently good that we need no restrictions on maneuvering subsequent to the switch, although we will repeat the calibration after IRU 1 is turned off. A previously reported problem with the CPE derived rate mode at large pitch angle has been diagnosed as a data input problem. ASVT testing today will continue verifying safe mode recovery in case of an A1 failure, and further testing will verify cases of safe mode recovery when we are running on IRU 2. Third string is down today as part of the ONLS 3.9.3 installation. Quick look data: OBSID Target Time Comment ----- ------ -------------- ------- 4398 1E 1207.4-5209 169:09:04 ACIS-S LETG looks good 3791 X1702-429 170:17:28 HRC-I NONE bright source; streak to edge of HRC 3792 X1715-321 170:18:02 HRC-I NONE target not obvious 3549 SGR A* 170:18:47 ACIS-I NONE looks good 4439 XTE J1814-338 171:02:12 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: 877-693-7198 PIN 693-7198 or e-mail 6937198@archwireless.net -------------------------------------------------------