Aug_08_2000_L382.txt Shift L382 Start at 2000:221:11:30:00 GMT = 2000 Aug 8 7:30am EDT End 2000 Aug 8 11:00am EDT SOT shift report 2000-08-08 L382 See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Aug_08_2000_L382.txt SOT Lead Bill Podgorski SOT SC/ACA FOT-SI HRC-SI ACIS-SI OTHER Plan: - Running AUG0600C on ascending leg with LETG inserted. Performing series of 20ks (ea) calibration observations of PKS2155-304 (obsid's 1795-1798) with ACIS-S/LETG. Then move to an 80ks observation of MKN 478 with HRC-S/LETG (obsid 886) starting at 221:1950. ORBITAL EVENTS: 2000:220:11:49:07.986 138 EPERIGEE ORBIT PERIGEE 2000:220:12:51:59.956 138 XP1RADZ0 PROTON1 RADIATION EXIT0 2000:220:16:17:59.956 139 XE1RADZ0 ELECTRON1 RADIATION EXIT0 2000:221:19:33:06.872 139 EAPOGEE ORBIT APOGEE 2000:222:21:16:44.614 139 EE1RADZ0 ELECTRON1 RADIATION ENTRY0 2000:223:03:17:09.696 139 EPERIGEE ORBIT PERIGEE 2000:223:08:14:44.614 140 XE1RADZ0 ELECTRON1 RADIATION EXIT0 2000:224:11:01:02.379 140 EAPOGEE ORBIT APOGEE 2000:225:12:51:25.065 140 EE1RADZ0 ELECTRON1 RADIATION ENTRY0 2000:225:18:46:00.717 140 EPERIGEE ORBIT PERIGEE 2000:225:18:47:25.065 140 EP1RADZ0 PROTON1 RADIATION ENTRY0 2000:225:19:43:25.065 140 XP1RADZ0 PROTON1 RADIATION EXIT0 2000:225:22:19:25.065 141 XE1RADZ0 ELECTRON1 RADIATION EXIT0 2000:227:02:29:10.755 141 EAPOGEE ORBIT APOGEE EVENTS DONE OBSID -------------- ---- ----- Start Shift 221:1130 AOS at start shift with DSS-46 (Canberra) Status at start shift was nominal (see note 1) 221:1200 1797 Problems with SSR Dump, extend pass to 221:1408 Problems locking up - gave up on pass Got NO SSR data this pass LOS DSS-46 221:1324 End of shift 221:1500 NOTES/ISSUES/PROBLEMS --------------------- 1) Status at 221:1200: WAS EXPECTED PCAD MODE = NPNT NPNT CONTROL LAW FLAG = NPNT NPNT Stars: = 5 5 FIDS = 3 3 RA = 329.555100 deg 329.55762 DEC = -30.349916 deg -30.35196 ROLL = 37.772288 deg 37.77244 Format = 2 2 OBSID = 1797 1797 SIM FA = -467 -468 SIM TSC = 72439 72440 HETGA = 80.21 deg (OUT) OUT HETGB = 80.58 deg (OUT) OUT LETGA = 7.46 deg (IN) IN LETGB = 4.46 deg (IN) IN EPHIN A-leak = 0.1800 B-leak = 0.0360 ACE Proton Flux = 350 (2 hr avg in 130-214 keV proton channel) Fluence (130-214KeV) = 2.5E+6 LT 3.6E+8 Radiation Level OK Kp Index (Costello) = 2.67 LT 6 is OK EPHIN Geom = LARG E150 = 7.1 E300 = 0.2 E1300 = 0.0 LT 10.00 (RADMON P4GM = 0.0 LT 300.00 Triggers) P41GM = 0.0 LT 8.47 HRC SP PS = ON IM PS = OFF SP Top Step = 43 Sp Bot Step = 54 Shield 1 HV = OFF Shield 2 HV = OFF Valid Event Rate 1 = 0 Valid Event Rate 2 = 0 Shield Event Rates = 0 ACIS FP Temp = -119.7 Cold Radiator = -127.9 DEA Pwr = 49.7 DPA Pwr = 39.8 Science State = Science Active 2) Notes from 9:00am meeting: Operations (Darrell): - 1 34m support, 3 26m supports last 24 hrs - 3 good SSR dumps, one in process (was unsuccessful) - Ran CAP 563, CPE warm start count, was == 1 still - Considering unsuccessful SSR dump in current pass, will need good dump next support (2000-2200 on DSS-66) at a fairly high data rate or we will roll-over to SSR-B. DSS-66 supports near apogee have not been very good in past, so in all likelyhood we will roll-over to SSR-B. Next pass after DSS-66 (26m) is a 1 hour DSS-24(34m) pass at 222:0630-0730. Should get good results from this pass and recover all data. Mission Planning (Dan/Ken/Kevin): - Working on AUG13 load. Decision made yesterday to drop obsid 718 from this load. Reason was that the bright source avoidance constraint of 1.5 deg was not well understood and even one second with HRC on this source (GX5-1) would violate safety constraints. Will consider this target later on. - Products will be out later on today. May schedule a special late load review today - or one at 2pm tomorrow. - JPL has lost some Goldstone ranging data. If it cannot be found it would degrade our ephemeris calculation somewhat. Spacecraft Engineering (Jeff/Rino): - Rino reported that the ACIS radiator temp was elevated above nominal (-127.9) during the last outgoing CTI and for part of the first obs after perigee (PKS2155-304 @ 2000:220:19:35, obsid 1795). - Looking at the detailed ACIS FP temp data we find: Event Time FP Temp Start science obs 1795 220:1911 -119.22 FP at nominal 220:1943 -119.70 So part of obs 1795 was done at a slightly elevated FP temp. - Jeff reported that we went down to two stars during entry to and exit from the last perigee. He later traced this to radiation hits causing loss of track. SOT (Bill Podgorski): - Radiation levels low again. - Agreed to contact ACIS team about FP warming (see above) - Suggestion made by Keith Havey, Michael McGuirk and Dave Natrop to step LETG into bumper during retraction Saturday. This will be discussed tomorrow. DSOPS(Jen): - Two quick looks (see below) GOT - All is OK. 3) Quick Look data review(OK unless noted): Seq # ObsID It Target start time SI Grat Comments ---------------------------------------------------------------------------------------------------------- 500076 00780 00 G11.2-0.3 2000:219:13:46:39.960 20.0 ACIS-S NONE 400022 00109 00 GX 5-1 2000:219:19:50:59.960 7.0 ACIS-S NONE