Jan_31_2001_M559.txt Shift M559 Start at 2001:031:17:30:00 GMT = 2001 Jan 31 12:30pm EST End 2001 Jan 31 3:30pm EST SOT shift report 2001-01-31 M559 See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Jan_31_2001_M559.txt SOT Lead Mark Freeman SOT SC/ACA FOT-SI HRC-SI ACIS-SI OTHER Plan: - Running JAN2901 on ascending leg in radiation zone, performing a CAL-ER (ACIS CTI) and then on to a set of HRC calibration observations beginning at 23:57Z. ACIS moves into the focal plane tomorrow at about 2:25am EST for a Vega calibration observation. Radiation levels still high but decreasing after peak of about 70,000 flux in ACE 112-187 proton channel at about 031:0500 UT. About 12,800 at start shift. See note 3 for Steve O'Dell's excellent summary of last orbit's high radiation exposure. ACE EPAM P3 rates were down to ~10k at end of shift. SSeq # ObsID It Target start time SI Grat RA dec roll slew ---------------------------------------------------------------------------------------------------------- ---- T_E05 CAL-ER 2001:031:07:45:09.741 7.6 -- -- 355.1300 38.5800 317.29 -0.01 ---- T_X06 CAL-ER 2001:031:17:54:28.749 20.8 -- -- 355.1300 38.5800 320.44 -0.00 600122 01565 00 M31 - SOUTH 2 2001:031:23:57:15.577 1.1 HRC-I NONE 10.0808 40.6763 306.27 12.56 600124 01567 00 M31 - SOUTH 1 2001:032:00:24:05.577 1.0 HRC-I NONE 10.5015 40.9278 306.01 0.41 ORBITAL EVENTS: 2001:030:08:22:26.464 205 EAPOGEE ORBIT APOGEE 2001:031:16:06:19.913 205 EPERIGEE ORBIT PERIGEE 2001:032:23:50:46.153 206 EAPOGEE ORBIT APOGEE 2001:034:07:35:11.162 206 EPERIGEE ORBIT PERIGEE EVENTS DONE OBSID -------------- ---- ----- Start Shift 031:1730 AOS (DSS-46 Canberra) 1800 Status at contact nominal 1803 61754 (see note 1) LOS (status essentially unchanged) 1958 End of shift 031:2015 NOTES/ISSUES/PROBLEMS --------------------- 1) Status at contact: UTC 2001:031:18:03:01 (Jan31) f_ACE 1.21e+04 F_ACE 0.00e+00 Kp 3.7 R km 32052A OBT 2001:031:18:02:29 CTUVCDU 124962 OBC s/w NRML FMT2_EPS CPEstat NORM OBT 97351349.43 ONLVCDU 124952 OBC Errs 0 OBSID 61754 EPState SUN SIM TTpos -99616 HETG Angle 79.84 PCADMODE NPNT RA 355.130 Bus V 30.24 SIM FApos -467 LETG Angle 78.34 PCONTROL NPNT Dec 38.580 Bus I 27.22 AOFSTAR GUID Roll 320.445 ACA Object SSSSSSSS Dither DISA HRC-I HV OFF ACA ImFunc TTTTTTTT Dith Yang 0.00 Yaw Rate 0.16 HRC-S HV ON ACA CCD Temp -10.4 Dith Zang 0.00 Pitch Rate -0.17 OBSMode NEXT ACA Int Time 1.698 Roll Rate 0.13 Door OP UNAC AOACSTAT OK FSS SunBeta SUN Door CL UNAC FSS Alfa -3.14 Batt 1 SOC 100.00% Avg HRMA Temp 70.61 FSS Beta 22.16 Batt 2 SOC 100.00% ACIS Stat7-0 67 Avg OBA Temp 51.29 SA Resolv 67.62 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 12.95 RadMon DISA HRMA power 58.30 SCS 128 ACT -Y SA Amps 13.72 EPHIN Geom SMAL OBA power 32.70 SCS 129 ACT +Y SA Temp 116.58 E150 696195.1 SCS 130 ACT -Y SA Temp 117.32 E300 51289.2 Roll Mom. -4.475 SCS 107 INAC E1300 333.3 Pitch Mom. 6.365 UpL Cmd Acc 47672 EPH A-Leak 0.9520 P4GM 54634.1 Yaw Mom. -0.267 Cmd Rej A 15 EPH B-Leak 0.1480 P41GM 0.3 2) Radiation levels mid-COMM: UTC 2001:031:18:39:01 (Jan31) f_ACE 1.26e+04 F_ACE 0.00e+00 Kp 4.0 R km 37517A Currently scheduled FPSI, OTG : HRC-S NONE Costello Kp : 4.00 ACE EPAM P3 Proton Flux (p/cm^2-s-sr-MeV) : 1.26e+04 Orbit Start Time : 2001:031:16:09:01 Geocentric Distance (km), Orbit Leg : 37517 A CRM Region : 3 (Magnetosphere) 3) Steve O'Dell's summary of last orbit's radiation exposure: An M flare occurred on 2001D28(Jan28)15:50GMT, with an associated minor (S1) solar-radiation storm. CXC SOT, OCC, and MSFC convened via telecon on four occasions to assess the radiation environment, ultimately deciding not to intervene in science operations. The estimated 140-keV (EPAM P3) fluence for that orbit is 3^10^9 p/(cm^2 sr MeV), or about 0.1% of the total mission fluence experienced to date, with ACIS unprotected. Thus, anticipated CTI degradation for this event is within the mission budget (5%/y). An additional consideration for not intervening was a time-critical observation coordinated with Hubble Space Telescope (HST). The anticipated shock finally passed ACE at 2001D31(Jan31)07:23GMT, reaching earth nearly an hour later, or more than an hour after translating ACIS out of the focal position in preparation for perigee passage. Additional pre-shock enhancement of the EPMA P3 proton intensity was slight, peaking at 7*10^4 p/(cm^2 sr MeV s) a couple hours before the shock passage. All ACE EPAM rates are now falling, with P3 at 2*10^4 p/(cm^2 sr MeV s). The shock arrived about 64.5 hours after the M flare, for an average speed of 650 km/s. Passage of the shock triggered a minor (G1) geomagnetic storm, which is still underway. ACIS operations are to resume on at 2001D32(Feb01)07:20GMT.