Sep_15_2000_L421.txt Shift L421 Start at 2000:259:11:30:00 GMT = 2000 Sep 15 7:30am EDT End 2000 Sep 15 11:00am EDT SOT shift report 2000-09-15 L421 See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Sep_15_2000_L421.txt SOT Lead Bill Podgorski SOT SC/ACA FOT-SI HRC-SI ACIS-SI OTHER Plan: - Running SEP1400A load. Finishing up second part of TOO observation of SS CYG (obsid 648). Then observe AR LAC-3 (obsid 8) before shutting down for rad zone at 259:1655. ACE radiation levels are high, but decision was made last night not to stop load. HETG is in and attenuates flux reaching ACIS. Seq # ObsID It Target start time SI Grat --------------------------------------------------------------------------------- 00648 SS CYG 2000:258:21:00 ACIS-S HETG Pickup the TOO 200006 00008 00 AR LAC-3 LAST QUAD 2000:259:14:14:00.758 7.6 ACIS-S HETG RAD ZONE ENTRY 2000:259:16:55:14.237 (was 18:55) 61923 2000:259:17:03:35.237 CTI PERIGEE 2000:260:03:47:47.225 61921 2000:260:08:40:45.237 200005 00007 AR LAC-2 FIRST QUAD 2000:260:12:03:55.237 7.5 ACIS-S HETG ORBITAL EVENTS: 2000:260:03:47:47.225 153 EPERIGEE ORBIT PERIGEE 2000:261:11:31:55.002 154 EAPOGEE ORBIT APOGEE EVENTS DONE OBSID -------------- ---- ----- Start Shift 259:1130 Status at last COMM was nominal (see note 1) Radiation levels (see note 2) 259:1150 End of shift 259:1500 NOTES/ISSUES/PROBLEMS --------------------- 1) Status at 259:1000: UTC 2000:259:10:00:02 (Sep15) f_ACE 4.48e+04 F_ACE 5.07e+08 Kp 2.0 R km 122979D OBT 2000:259:09:59:11 CTUVCDU 3813887 OBC s/w NRML FMT2_NORM CPEstat OBT 85399151.26 ONLVCDU 3813872 OBC Errs 0 OBSID 648 EPState SUN SIM TTpos 74423 HETG Angle 6.7 PCADMODE NPNT RA 325.688 Bus V 30.71 SIM FApos -467 LETG Angle 78.3 PCONTROL NPNT Dec 43.612 Bus I 30.01 AOFSTAR GUID Roll 213.093 ACA Object FFFSSSSS Dither ENAB HRC-I HV ON ACA ImFunc TTTTTTTT Dith Yang -6.40 Yaw Rate 0.26 HRC-S HV OFF ACA CCD Temp -10.4 Dith Zang 6.48 Pitch Rate -0.22 OBSMode NEXT ACA Int Time 1.698 Roll Rate 0.34 Door OP UNAC AOACSTAT OK FSS SunBeta SUN Door CL UNAC FSS Alfa 2.30 Batt 1 SOC 100.00% Avg HRMA Temp 70.63 FSS Beta -37.64 Batt 2 SOC 100.00% ACIS Stat7-0 64 Avg OBA Temp 50.89 SA Resolv 127.59 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 14.10 HRMA power 35.80 SCS 128 -Y SA Amps 15.46 EPHIN Geom LARG OBA power 59.30 SCS 129 +Y SA Temp 112.04 E150 295.6 SCS 130 -Y SA Temp 112.35 E300 4.4 Roll Mom. -1.615 E1300 0.1 Pitch Mom. -8.922 UpL Cmd Acc 21560 EPH A-Leak 0.5160 P4GM 56.4 Yaw Mom. 4.868 Cmd Rej A 178 EPH B-Leak 0.0920 P41GM 0.2 Expected RA, DEC and ROLL: 325.6868 43.6092 213.09 2) Radiation levels at 259:1150: ACE Proton Flux = 46620 (2 hr avg in 130-214 keV proton channel) Fluence (130-214KeV) = 3.3E+8 LT 3.6E+8 Radiation Level OK Kp Index (Costello) = 2.67 LT 6 is OK Orbital dose in 130-21 = 5.7E+8 Budget per "event" == 2.0E+9 3) Notes from 9:00am meeting: Operations (Darrell): - 3 scheduled supports last 24 hours - Morning DSS-54 support extended into afternoon to help with uplink of new loads and on-board radiation monitoring - 4 SSR dumps done - Problem with DSS-54 command link at start of pass yesterday AM. Used DSS-66 to command S/C on. Problem turned out to be a bad Command Processor Assembly. - 4 CAPS run, 654 - warm boot of ACIS BEP, 655 - enable SCS 82, 329 - manual momentum unload and 617 - enable SCS 107. - Afternoon pass moved up to start at 1840 now to give squeegy mode more time. Mission Planning (Ken/Sabrina): - SEP14 recovery load made, uplinked and running - SEP17 load needs to be re-run for continuity, will do a diff comparison with previous revision - Working on set of ATS's to handle eclipse in case load is stopped. Spacecraft Engineering (Jeff): - All is well with S/C. SOT (Bill Podgorski): - Radiation levels were high all day, increasing to a peak FLUX of about 70,000 in proton channel, which occurred last night after the 8:45pm pass had ended. EPHIN rates were also high, but decreasing. - Decision was made last night not to call telecon, since dose (including HETG attenuation factor) was considered acceptable (within budget limits). - Radiation levels had started to decrease prior to the 5:00am pass, so no action was needed. Levels are still slowly dropping. We expect a dose for this orbit of under 1e+9. DSOPS(Joy): - No quick looks due to SI safing. - Use of obsid 648 both prior to safing action and later on after the new load was started may complicate ground processing. Joy will report on this. Roger indicated that it may be worthwhile to manually change the obsid in future cases like this one.