Apr_04_2000_M256.txt Shift M256 Start at 2000:095:17:30:00 GMT = 2000 Apr 04 1:30pm EDT End 2000 Apr 04 4:30pm EDT See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Apr_04_2000_M256.txt SOT Lead Bill Podgorski SOT SC/ACA FOT-SI HRC-SI ACIS-SI OTHER Plan: - Running APR0400B, TOO load, observing CYG X-3 (TOO) with ACIS-S + HETG. Finish TOO at 095:2001 and start first of two CTI measurements before entering rad zone. ORBITAL EVENTS: 2000:094:21:04:35.941 91 EAPOGEE ORBIT APOGEE 2000:096:04:47:34.454 91 EPERIGEE ORBIT PERIGEE 2000:097:12:31:46.991 92 EAPOGEE ORBIT APOGEE 2000:098:20:14:59.823 92 EPERIGEE ORBIT PERIGEE 2000:100:03:59:45.416 93 EAPOGEE ORBIT APOGEE EVENTS DONE OBSID -------------- ---- ----- Start Shift LOS 095:1730 Chandra Status at last pass was nominal(note 1) 440 AOS DSS-46 (Caberra) 095:1900 425 Lightning hit on antenna causes loss of track 095:1910 (see note 3) AOS again 095:1912 Lots of problems due to weather + lightning Telemetry off and on Switch LGA's to try to improve telemetry Chandra status at start of pass was nominal (note 2) Move SIM TSC to -99616, retract HETG and execute 095:2001 2_RADZONE_ENTRY 095:2007 Stop SSR dump due to storm related telemetry problems 095:2010 Start maneuver to perigee attitude 095:2016 62095 Switch LGA's 095:2023 Decide to switch to DSS-24 for SSR dump 095:2030 (no go on dump from DSS-46) Change command link to DSS-24 095:2043 Disable downlink from DSS-46 095:2051 Enable downlink from DSS-24 095:2052 Enable uplink from DSS-24 095:2055 Start SSR dump at 1187840 095:2100 End SSR dump 095:2118 End Pass 095:2120 End of shift 095:2120 NOTES/ISSUES/PROBLEMS --------------------- 1) Chandra status at last pass: UTC 2000:095:10:55:01 (Tue Apr 4) f_ACE 7.19e+01 F_ACE 1.61e+07 R km 124405D OBT 2000:095:10:53:50 CTUVCDU 15639551 OBC s/w NRML FMT2_NORM CPEstat OBT 71232830.73 ONLVCDU 15639536 OBC Errs 0 OBSID 440 EPState SUN SIM TTpos 92903 HETG Angle 81.0 PCADMODE NPNT RA 16.033 Bus V 30.87 SIM FApos -535 LETG Angle 79.1 PCONTROL NPNT Dec -71.976 Bus I 28.49 AOFSTAR GUID Roll 182.245 ACA Object FFFSSSSS Dither ENAB HRC-I HV OFF ACA ImFunc TTTTTTTT Dith Yang 5.75 Yaw Rate -0.02 HRC-S HV ON ACA CCD Temp -10.4 Dith Zang -7.31 Pitch Rate -0.03 OBSMode NEXT ACA Int Time 1.698 Roll Rate 0.07 Door OP UNAC AOACSTAT OK FSS SunBeta SUN Door CL UNAC FSS Alfa -0.30 Batt 1 SOC 100.00% Avg HRMA Temp 70.61 FSS Beta 11.84 Batt 2 SOC 100.00% ACIS Stat7-0 66 Avg OBA Temp 50.97 SA Resolv 77.97 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 13.53 HRMA power 33.00 -Y SA Amps 14.68 EPHIN Geom LARG OBA power 132.60 +Y SA Temp 112.04 E1300 0 -Y SA Temp 112.66 P4GM 0 Roll Mom. 7.149 SCS 128 P41GM 0 Pitch Mom. 8.687 SCS 129 UpL Cmd Acc 1098 A-Leak 0.3000 Yaw Mom. 2.343 SCS 130 Cmd Rej A 80 B-Leak 0.0480 Expected RA, Dec, Roll (degrees): 16.03837, -71.97430, 182.23966 2) Chandra's state at 095:1900 was: WAS EXPECTED PCAD MODE = NPNT NPNT CONTROL LAW FLAG = NPNT NPNT Stars: = 5 5 FIDS = 3 3 RA = 308.122825 deg 308.12283 DEC = 40.940958 deg 40.94095 ROLL = 78.234297 deg 78.23429 Format = 2 2 OBSID = 425 425 SIM FA = -467 -468 SIM TSC = 75624 75624 HETGA = 6.71 deg (IN) IN HETGB = 6.33 deg (IN) IN LETGA = 80.21 deg (OUT) OUT LETGB = 79.08 deg (OUT) OUT EPHIN A-leak = 0.3320 B-leak = 0.0560 ACE Proton Flux = 77 (2 hr avg in 130-214 keV proton channel) Fluence (130-214KeV) = 5.5E+5 LT 3.6E+8 Radiation Level OK EPHIN Geom = LARG E1300 = 4 LT 1318.52 (RADMON P4GM = 199 LT 3542.40 Triggers) P41GM = 1 LT 100.00 HRC SP PS = ON IM PS = OFF SP Top Step = 43 SP Bot Step = 54 Shield 1 HV = OFF Shield 2 HV = ON Shield 2 Stp = 8 Valid Event Rate 1 = 0 Valid Event Rate 2 = 0 Shield Event Rates = 7600 ACIS FP Temp = -119.9 Cold Radiator = -127.9 DEA Pwr = 48.7 DPA Pwr = 41.2 3) Bad weather (lightning) at Canberra caused telemetry problems throughout pass. Caused equipment problems at DSS-46 throughout pass.