May_11_2000_L293.txt Shift L293 Start at 2000:132:12:10 GMT = 2000 May 11 08:10am EST End 12:00pm EST See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/May_11_2000_L293.txt SOT Lead Ed Kellogg SOT-SI SOT SC/ACA FOT-SI HRC-SI ACIS-SI OTHER Plan: - OBSID 00911, RX J2247+0337 2000:132:06:4, ACIS-I NONE then T_E05, CAL-ER 2000:132:21:15; T_X0, CAL-ER 2000:133:09:47 EVENTS DONE OBSID -------------- ---- ----- (no passes this shift) Notes from 9 am meeting ------------------------ Ops: 3 supports, 3 dumps. DSS46 was OK at 130,000 km, so whatever problems they were having are now solved. Load is good 'till 135:23:45. Mission planning: load review @ 1:30 today for revamped MAY1400 Spacecraft eng'ng: * Kodak reviewed the data from the HETG tests and concur that the A retraction switch is not working properly so the grating moves into the bumper spring. Andy Northrup reviewed the voltage and potentiometer data. The motor shows a unique large back EMF excursion at the time of the failure, indicating the grating hit the bumper. The detailed pot readings support this. * Next comes a full test of grating operation on MCE-B. Products for hardware & software operation are being developed. The test, including eight HETG moves, is planned for Sunday at ~5:30 pm. SOT Lead: * No access to asc.harvard.edu web page, so we couldn't report on ACE proton flux (but see below, it became available) * snapshot is working (see below) ASCDS: remus server is still not fully operational, but we were able to process the observation where the HETG was supposed to be inserted and confirmed that the data show it was not inserted. CXC MGR: Cady Coleman visits today at 10:00 am. We can meet with her at 10:30 in the control room. Data ---- On colossus at 1241 GMT.(/dsops/GOT/input), - May 11 01:19 2000_131_1601_131_2323_Dump_EM_59625.gz Evaluation of QL data --------------------- The following observations should be available for review. If there is no comment after the entry, it means that there is no record of ascdsops QL processing. If it has been reviewed by SOT Lead, a review evaluation comment is given. If it is in the ascsdops record but not listed as QL processed, the ascdsops comment is given. OBSID Target Time SI SOT Eval. ascdsops comment ----- ------ ----------- -- ------- ----------------- 00507 RX J1347-114 2000:120:10:46 ACIS-S NONE OK 00444 E0102-72.3,CHIP S3 2000:121:08:40 ACIS-I NONE 00927 CL 0848.6+4453 2000:125:14:50 ACIS-I NONE nothing obvious 00834 NGC 4261 2000:127:02:02 ACIS-S NONE OK 00380 M82 2000:127:12:17 ACIS-I NONE OK 00735 SN 1993J 2000:128:05:34 ACIS-S NONE 00906 ABELL 1995 2000:128:19:55 ACIS-S NONE 00927 CL 0848.6+4453 2000:125:15:10 ACIS-I NONE 00834 NGC 4261 2000:127:02:49 ACIS-S NONE 49899 PROXIMA CENTAURI 2000:128:22:53 ACIS-S HETG source visible, grating out 00906 ABELL 1995 2000:129:08:23 ACIS-S NONE 00682 XTE J1550-564 2000:129:23:0 ACIS-S HETG 00641 PROXIMA CENTAURI 2000:130:00:0 ACIS-S HETG At this point the load was stopped because of the HETG anomaly 00909 ZW 3146 2000:131:03:42 ACIS-I NONE 00630 NGC 6543 2000:131:17:14 ACIS-S NONE NOTES/ISSUES/PROBLEMS --------------------- ACE 2 hr fluence is 4.9e5 vs. threshold 3.6e8. Orbital fluence is 2.7e6 vs. threshold 1.0e9 ACIS focal plane temperature was -119.9 at 5:18 GMT Report on yesterday's ACIS telecon ---------------------------------- The problem of varying bias with the squeegee mode has been diagnosed and a fix formulated. The problem is caused by starting up with the squeegee rows being full of charge, which spills over to the rest of the chip. As the chip runs, this initial condition reaches an equilibrium after about 1 hr, after which the bias is stable. The proposed solution is to empty out the squeegee rows at startup, so equilibrium is reached quickly. We plan to test this schemi on-orbit on May 22. Other promising readout modes are being investigated. Analysts are developing a tool to predict magnetotail proton flux problems based on ACE data and geomagnetic and particle belt models. A program of testing the grating material to see radiation damage effects by low energy protons is being considered. SOT mission planning is considering ways to reduce the number of grating insertions by sorting the order of observations. Chandra's state was: --------------------- UTC 2000:132:14:07:01 (Thu May 11) f_ACE 8.81e+01 F_ACE 1.17e+07 R km 115652D OBT 2000:132:09:19:02 CTUVCDU 11315455 OBC s/w NRML FMT2_NORM CPEstat OBT 74423942.86 ONLVCDU 11315440 OBC Errs 0 OBSID 911 EPState SUN SIM TTpos 89919 HETG Angle 80.6 PCADMODE NPNT RA 341.879 Bus V 31.02 SIM FApos -535 LETG Angle 79.1 PCONTROL NPNT Dec 3.644 Bus I 30.51 AOFSTAR GUID Roll 107.984 ACA Object FFFSSSSS Dither ENAB HRC-I HV OFF ACA ImFunc TTTTTTTT Dith Yang -7.94 Yaw Rate 0.18 HRC-S HV ON ACA CCD Temp -10.4 Dith Zang -4.19 Pitch Rate -0.15 OBSMode NEXT ACA Int Time 1.698 Roll Rate 0.08 Door OP UNAC AOACSTAT OK FSS SunBeta SUN Door CL UNAC FSS Alfa -0.26 Batt 1 SOC 100.00% Avg HRMA Temp 70.61 FSS Beta 22.97 Batt 2 SOC 100.00% ACIS Stat7-0 64 Avg OBA Temp 51.13 SA Resolv 66.71 Batt 3 SOC 100.00% Cold Rad -127.9 OBA Tavg Fault NFLT SA Sun Pres ILLM Warm Rad -82.0 OBA Trng Fault NFLT +Y SA Amps 14.49 HRMA power 70.10 -Y SA Amps 15.66 EPHIN Geom LARG OBA power 67.40 +Y SA Temp 109.28 E1300 2 -Y SA Temp 109.89 P4GM 1 Roll Mom. 6.426 SCS 128 P41GM 0 Pitch Mom. 4.968 SCS 129 UpL Cmd Acc 12100 A-Leak 0.4240 Yaw Mom. 3.827 SCS 130 Cmd Rej A 66 B-Leak 0.0680