SOT shift report 2000-08-17 L392 Start at 2000:230:12:15 GMT = 2000 Aug. 17 08:15am EDT End 12:00pm EDT See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Aug_17_2000_L392.txt SOT Lead Ed Kellogg Plan: ---- Doing OBSID 00943," MBM 12 2000:230:01:04, 56.4 ks - ACIS-S NONE," MEASURING THE AGE OF THE LOCAL BUBBLE BY OBSERVING O VII AND O VIII EMISSION TOWARDS molecular cloud MBM 12. This cloud shadows 70%-95% of the 3/4 keV (0.44-1.21 keV) diffuse background, in order to observe the foreground emission from O VII and O VIII at 0.57 and 0.65 keV. This will be the first-ever detection of an identifiable emission line from the Local Bubble. The O VIII/O VII ratio depends sensitively on the time since the gas was heated by a shock, and therefore determines the age of the Local Bubble. This observation will also help distinguish between models of the ISM dominated by hot or warm gas. If the Local Bubble is young (1e5 yr) and already large, this suggests the ISM is filled with hot gas. If it is old (>1e6 yr), then this would suggest bubbles do not break out and do not fill the ISM with hot gas. EVENTS GMT OBSID -------------- ---- ----- no contact during this shift Notes from 9 am meeting ------------------------ OPS: Passes 3 over the last day SSR dumps 3 , of which 0 failed Data loss none Load is good -> day ? CAP to patch OBC back to normal from off-pointing done. CAP to unload momentum by ground command done. MP: We have real time contact for the grating retraction, not for insertion, but that is OK. Eclipse season starts Aug. 27th. S/C: They are working on changes to SCS82 - changes to grating safing. The new version will stop grating motion and call SCSs 109/110. On day 221:18:30 Tom Aldcroft reported a drift in the fidlite positions during an observation. This happened after a change in S/C attitude, so things were still coming to thermal equilibrium. This is normal behavior and should not degrade the observation, but Bill Podorski and Rino Giordano are analyzing to derive sensitivities. GOT: - SOT: Radiation is low. Meetings: Load review, 1 pm Flight Director Board, 2 pm ACIS telecon 4 pm. Data ---- On colossus at 1430 GMT.(/dsops/GOT/input), - Aug 17 06:29 2000_229_1638_230_0448_Dump_EM_03810.gz Evaluation of QL data --------------------- The following OBSIDs should be available for review. No comment after the entry means the QL image has not been distributed yet to SOT. OBSID Target Time SI SOT Eval. ----- ------ ----------- -- ------- 00746 SGR 1806-20 2000:228:18:10 ACIS-S NONE OK 00739 2EG J1811-2339 2000:229:03:42 ACIS-I NONE nothing obvious 00383 NGC 253 2000:229:07:14 ACIS-S NONE 00791 NGC 1407 2000:229:08:18 ACIS-S NONE 00421 MITG J0414+0534 2000:229:22:30 ACIS-S NONE OK 00943 MBM 12 2000:230:01:04 ACIS-S NONE NOTES/ISSUES/PROBLEMS --------------------- ACE 2 hr fluence is (NA) vs. threshold 3.6e8. Orbital fluence (R>70km)is 3.3e8 vs. threshold 1.0e9. ACIS focal plane temperature -119.7 at 0659 EDT. Chandra's state was: --------------------- UTC 2000:230:12:38:01 (Aug17) f_ACE 1.10e+03 F_ACE 3.30e+08 Kp 2.3 R km 106505D OBT 2000:230:10:59:27 CTUVCDU 10827263 OBC s/w NRML FMT2_NORM CPEstat OBT 82897167.13 ONLVCDU 10827248 OBC Errs 0 OBSID 943 EPState SUN SIM TTpos 75624 HETG Angle 80.2 PCADMODE NPNT RA 43.979 Bus V 31.02 SIM FApos -467 LETG Angle 78.3 PCONTROL NPNT Dec 19.486 Bus I 28.74 AOFSTAR GUID Roll 105.145 ACA Object FFFSSSSS Dither ENAB HRC-I HV ON ACA ImFunc TTTTTTTT Dith Yang 7.56 Yaw Rate -0.24 HRC-S HV OFF ACA CCD Temp -10.4 Dith Zang -0.59 Pitch Rate 0.06 OBSMode NEXT ACA Int Time 1.698 Roll Rate 0.11 Door OP UNAC AOACSTAT OK FSS SunBeta SUN Door CL UNAC FSS Alfa 1.50 Batt 1 SOC 100.00% Avg HRMA Temp 70.61 FSS Beta -7.88 Batt 2 SOC 100.00% ACIS Stat7-0 64 Avg OBA Temp 50.89 SA Resolv 97.32 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 13.72 HRMA power 29.90 SCS 128 -Y SA Amps 14.68 EPHIN Geom LARG OBA power 38.20 SCS 129 +Y SA Temp 108.97 E150 2.2 SCS 130 -Y SA Temp 108.70 E300 0.1 Roll Mom. 1.785 E1300 0.0 Pitch Mom. -5.443 UpL Cmd Acc 46851 EPH A-Leak 0.6840 P4GM 0.0 Yaw Mom. 1.738 Cmd Rej A 212 EPH B-Leak 0.1200 P41GM 0.0