SOT shift report 2002-04-02 L985 Shift M985. Start at 092:22:00 GMT = 05:00pm 02 Apr EST End 06:30pm 02 Apr See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Apr_02_2002_M985.txt. SOT Lead Mark Freeman (Times will be given in GMT on day 092.) PLAN ---- At initiation of comm at approx. 092:22:20 it was noted that snapshot indicated an SCS107 trip (RADMON and SCS107 disabled, OBSID still showing CTI measurement instead of planned science OBSID 02668). Radiation environment appears benign, and it does not appear that RADMON was enabled too early (still in the belts), so the current thinking is that it was due to the EPHIN error flag having been set, as happened last December. Plan is for a short tag-up telecon at 6:45 and then a longer one once the SSR data has been dumped and analyzed later this evening. Next Comms: 092:1215 to 1315 092:2215 to 2315 093:0500 to 0600 093:1345 to 1445 094:0030 to 0130 094:0900 to 1000 Orbital events: 2002:093:18:08:33.494 367 ORBIT APOGEE 2002:095:01:53:02.677 367 ORBIT PERIGEE 2002:096:09:36:13.313 368 ORBIT APOGEE 2002:097:17:20:21.888 368 ORBIT PERIGEE 2002:099:01:03:45.984 369 ORBIT APOGEE 2002:100:08:47:09.593 369 ORBIT PERIGEE EVENTS ------ Start shift 22:00 AOS (DSS-54) 22:22 Noted symptoms of SCS107 trip 22:24 61246* Possible cause is EPHIN error flag 22:45 LOS 23:30 Telecon 23:45 End shift 093:01:00 NOTES/ISSUES/PROBLEMS --------------------- 1) Chandra status near initiation of comm: UTC 2002:092:22:24:37 (Apr 2) f_ACE 8.10e+01 F_CRM 8.27e+07 Kp 2.7 R km 95676A OBT 2002:092:22:24:01 CTUVCDU 9603199 OBC s/w NRML FMT2_EPS CPEstat NORM OBT 134173441.87 ONLVCDU 9603184 OBC Errs 12 OBSID 61246 EPState SUN SIM TTpos -99616 HETG Angle 79.46 PCADMODE NPNT RA 265.195 Bus V 30.08 SIM FApos -535 LETG Angle 77.96 PCONTROL NPNT Dec -53.685 Bus I 30.51 AOFSTAR GUID Roll 79.499 ACA Object SSSSSSSS Dither ENAB HRC-I HV OFF ACA ImFunc NNNTTTTT Dith Yang -2.40 Yaw Rate -0.13 HRC-S HV ON ACA CCD Temp -10.4 Dith Zang -7.06 Pitch Rate -0.02 OBSMode NEXT ACA Int Time 1.698 Roll Rate -0.08 Door OP UNAC AOACSTAT OK FSS SunBeta SUN Door CL UNAC FSS Alfa -0.45 Batt 1 SOC 100.00% Avg HRMA Temp 70.61 FSS Beta -14.27 Batt 2 SOC 100.00% ACIS Stat7-0 66 Avg OBA Temp 51.13 SA Resolv 104.07 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 14.68 RadMon DISA HRMA power 88.20 SCS 128 ACT -Y SA Amps 15.46 EPHIN Geom LARG OBA power 73.30 SCS 129 ACT +Y SA Temp 112.35 E150 59816.6 SCS 130 ACT -Y SA Temp 112.35 E300 1718.8 Roll Mom. -12.603 SCS 107 DISA E1300 3.5 Pitch Mom. -10.106 UpL Cmd Acc 30194 EPH A-Leak 1.0200 P4GM 54287.3 Yaw Mom. 5.923 Cmd Rej A 73 EPH B-Leak 0.4320 P41GM 0.3 2) Radiation environment: UTC 2002:092:23:03:34 (Apr 2) f_ACE 5.44e+01 F_CRM 8.98e+07 Kp 2.7 R km 98498A Currently scheduled FPSI, OTG : HRC-S NONE Costello Kp : 2.67 ACE EPAM P3 Proton Flux (p/cm^2-s-sr-MeV) : 7.39e+01 GOES-8 P2 flux, in RADMON P4GM units : 0.00 GOES-10 P2 flux, in RADMON P4GM units : 0.00 GOES-8 P5 flux, in RADMON P41GM units : 0.01 GOES-10 P5 flux, in RADMON P41GM units : 0.02 Orbit Start Time : 2002:092:10:29:00 Geocentric Distance (km), Orbit Leg : 98143 A CRM Region : 3 (Magnetosphere) External Proton Flux (p/cm^2-s-sr-MeV) : 3.96299000000e+03 Attenuated Proton Flux (p/cm^2-s-sr-MeV) : 0.00000000000e+00 External Proton Orbital Fluence (p/cm^2-sr-MeV) : 5.18421034200e+08 Attenuated Proton Orbital Fluence (p/cm^2-sr-MeV) : 8.98289850000e+07