SOT shift report 2001-04-11 M629 -------- See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Apr_11_2001_M629.txt. Shift M629. Start at 101:12:00 GMT = 11:45am 11 Apr EDT End 03:30pm 11 Apr SOT Lead MDF ACIS Yousaf Butt (Times will be given in GMT on day 101.) PLAN ---- Attempt to get earlier comm due to high radiation levels following several CMEs during the previous couple of days. Discontinue load if RADMON has not automatically tripped. Next Comms: 101:17:00 to 19:00 102:02:00 to 04:00 102:12:00 to 13:00 102:19:50 to 21:50 103:06:00 to 07:00 103:15:25 to 17:25 104:00:00 to 01:00 104:09:00 to 10:00 104:17:00 to 19:00 Orbital events: 2001:101:17:56:47.180 232 APOGEE 2001:103:01:40:18.402 232 PERIGEE 2001:104:09:24:00.129 233 APOGEE EVENTS TIME ------ ---- Start shift 101:1545 AOS (DSS-46) early due to expected rad levels 1620 Note RADMON trip from telemetry (note 1) 1622 OC/DSS-46 reconfigure to lower data rate due to ratty telemetry 1708 LOS (DSS-46) 1900 End shift 1915 NOTES/ISSUES/PROBLEMS --------------------- 1) Chandra in radiation safing configuration following RADMON trip at approx. 101:14:51 (SIM in HRC position and ACA not tracking fids): UTC 2001:101:16:26:16 (Apr11) f_ACE 5.71e+05 F_ACE 1.15e+09 Kp 6.0 R km 140262A OBT 2001:101:16:25:42 CTUVCDU 6927029 OBC s/w NRML FMT2_EPS CPEstat NORM OBT 103393542.07 ONLVCDU 6927016 OBC Errs 12 OBSID 2080 EPState SUN SIM TTpos -99616 HETG Angle 6.34 PCADMODE NPNT RA 166.730 Bus V 30.55 SIM FApos -467 LETG Angle 78.34 PCONTROL NPNT Dec 72.595 Bus I 27.22 AOFSTAR GUID Roll 212.819 ACA Object SSSSSSSS Dither ENAB HRC-I HV OFF ACA ImFunc NNNTTTTT Dith Yang 7.75 Yaw Rate -0.04 HRC-S HV ON ACA CCD Temp -10.4 Dith Zang 5.47 Pitch Rate -0.06 OBSMode NEXT ACA Int Time 1.698 Roll Rate 0.15 Door OP UNAC AOACSTAT OK FSS SunBeta SUN Door CL UNAC FSS Alfa 0.15 Batt 1 SOC 100.00% Avg HRMA Temp 70.61 FSS Beta -6.38 Batt 2 SOC 100.00% ACIS Stat7-0 67 Avg OBA Temp 51.05 SA Resolv 96.71 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 12.76 RadMon DISA HRMA power 50.70 SCS 128 INAC -Y SA Amps 13.14 EPHIN Geom LARG OBA power 110.60 SCS 129 INAC +Y SA Temp 112.35 E150 1553.2 SCS 130 INAC -Y SA Temp 112.35 E300 52.2 Roll Mom. 1.623 SCS 107 DISA E1300 1.5 Pitch Mom. -1.195 UpL Cmd Acc 1332 EPH A-Leak 1.0200 P4GM 313.0 Yaw Mom. 6.775 Cmd Rej A 28 EPH B-Leak 0.2120 P41GM 0.8 2) Radiation levels still very high, although ACE EPAM P3 rates have decreased slightly from the most recent high of 6.8e5 at ~15:25Z. P4GM rates have been hovering around the trip level of 300. UTC 2001:101:17:13:20 (Apr11) f_ACE 4.90e+05 F_ACE 1.19e+09 Kp 6.3 R km 140432A Currently scheduled FPSI, OTG : HRC-S HETG Costello Kp : 6.00 ACE EPAM P3 Proton Flux (p/cm^2-s-sr-MeV) : 4.91e+05 Orbit Start Time : 2001:100:10:19:00 Geocentric Distance (km), Orbit Leg : 140420 A CRM Region : 2 (Magnetosheath) External Proton Flux (p/cm^2-s-sr-MeV) : 9.89310570000e+05 Attenuated Proton Flux (p/cm^2-s-sr-MeV) : 0.00000000000e+00 External Proton Orbital Fluence (p/cm^2-sr-MeV) : 1.39732644584e+10 Attenuated Proton Orbital Fluence (p/cm^2-sr-MeV) : 2.23290564646e+09 3) Replan meeting/telecon is planned to follow the load review this afternoon. Load review at 2:00pm EDT, radiation replan meeting/telecon at 2:30pm EDT, the usual number. Notes from the meeting: - Chandra safe from viewing constraints for the time being (this week?) - Next logical starting point is at start of next orbit (perigee at 2001:103:01:40). - First two observations are ACIS/HETG, lasting until after apogee (grating out at ~104:15:20 GMT), that is late morning Saturday EDT. Following observation is bare ACIS-S. - Load review for this replan will be at 1pm EDT tomorrow (12 April) We will discuss the radiation situation at or after this review. Prognosticators welcome.