Jan_11_2001_L539.txt Shift L539 Start at 2001:011:12:30:00 GMT = 2001 Jan 11 7:30am EST End 2001 Jan 11 12:00pm EST SOT shift report 2001-01-11 L539 See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Jan_11_2001_L539.txt SOT Lead Bill Podgorski SOT SC/ACA FOT-SI HRC-SI ACIS-SI OTHER Plan: - Running JAN0801C on ascending leg. Performing a long ( > 1 day) observation of HR 1099, V711 TAU (obsid 1879) with HRC-S/LETG. Radiation level is very low, but a full HALO CME was observed by the LASCO and EIT instruments onboard SOHO yesterday (look for it tomorrow/Saturday if at all) Decision on how to handle VENUS observation - see note . Seq # ObsID It Target start time SI Grat RA dec roll slew ---------------------------------------------------------------------------------------------------------- 100026 02411 00 VENUS 2001:010:19:30:54.545 6.0 ACIS-S LETG 339.6244 -9.4132 291.21 46.60 100026 02414 00 VENUS 2001:010:21:19:24.545 6.0 ACIS-S LETG 339.7025 -9.3815 291.23 0.08 200107 01879 00 HR 1099, V711 TAU 2001:010:23:31:32.602 95.5 HRC-S LETG 54.1736 0.5961 301.39 74.85 500123 01852 00 VELA PULSAR 2001:012:02:38:05.390 25.0 HRC-S LETG 128.8152 -45.1966 15.12 87.21 290081 01000 00 HZ43 2001:012:10:13:33.807 4.0 HRC-I LETG 199.1027 29.0759 72.98 104.88 290085 01004 00 HZ43 2001:012:11:28:43.807 15.0 HRC-I LETG 199.0470 28.9165 73.01 0.17 ---- ILETG 00 CAL-ER 2001:012:15:48:10.846 3.6 -- -- 199.0000 29.0000 74.67 1.64 100021 02391 00 McNaught-Hartley 2001:012:17:16:10.846 3.4 ACIS-S NONE 232.3128 -3.5938 67.53 45.65 ORBITAL EVENTS: 2001:011:20:05:10.814 198 EAPOGEE ORBIT APOGEE 2001:013:03:50:47.997 198 EPERIGEE ORBIT PERIGEE 2001:014:11:33:50.446 199 EAPOGEE ORBIT APOGEE 2001:015:19:18:16.876 199 EPERIGEE ORBIT PERIGEE EVENTS DONE OBSID -------------- ---- ----- Start Shift 011:1230 AOS DSS-24 (Goldstone) 011:1425 1879 (Status at AOS was nominal, see note 1) LOS DSS-24 011:1525 End of shift 011:1600 NOTES/ISSUES/PROBLEMS --------------------- 1) Status at AOS: UTC 2001:011:14:26:02 (Jan11) f_ACE 2.43e+01 F_ACE 2.50e+05 Kp 3.0 R km 138865A OBT 2001:011:14:25:49 CTUVCDU 10108029 OBC s/w NRML FMT1_NORM CPEstat NORM OBT 95610349.03 ONLVCDU 10108016 OBC Errs 0 OBSID 1879 EPState SUN SIM TTpos -99616 HETG Angle 79.84 PCADMODE NPNT RA 54.170 Bus V 29.77 SIM FApos -990 LETG Angle 4.46 PCONTROL NPNT Dec 0.592 Bus I 33.81 AOFSTAR GUID Roll 301.386 ACA Object FFFSSSSS Dither ENAB HRC-I HV OFF ACA ImFunc TTTTTTTT Dith Yang 4.65 Yaw Rate -0.04 HRC-S HV ON ACA CCD Temp -10.4 Dith Zang 19.95 Pitch Rate -0.06 OBSMode OBSV ACA Int Time 1.698 Roll Rate 0.13 Door OP UNAC AOACSTAT OK FSS SunBeta SUN Door CL UNAC FSS Alfa -7.05 Batt 1 SOC 100.00% Avg HRMA Temp 70.63 FSS Beta -29.29 Batt 2 SOC 100.00% ACIS Stat7-0 65 Avg OBA Temp 51.05 SA Resolv 119.74 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 16.44 RadMon ENAB HRMA power 57.30 SCS 128 ACT -Y SA Amps 17.03 EPHIN Geom LARG OBA power 89.40 SCS 129 ACT +Y SA Temp 116.95 E150 3.4 SCS 130 ACT -Y SA Temp 117.68 E300 0.1 Roll Mom. 8.460 SCS 107 INAC E1300 0.0 Pitch Mom. -5.036 UpL Cmd Acc 10731 EPH A-Leak 1.0160 P4GM 0.0 Yaw Mom. 2.275 Cmd Rej A 192 EPH B-Leak 0.1800 P41GM 0.0 HRC SP PS = ON, Steps 90/102 IM PS = OFF Shield 1 HV = OFF Shield 2 HV = ON, Step 8 Valid Event Rate 1 = 63 Valid Event Rate 2 = 74 Shield Event Rates = 3000 ACIS FP Temp = -119.7 DEA Pwr = 37.2 DPA Pwr = 41.0 Science State = Science Active UTC 2001:011:14:26:02 (Jan11) f_ACE 2.43e+01 F_ACE 2.50e+05 Kp 3.0 R km 138865A Currently scheduled FPSI, OTG : HRC-S LETG Costello Kp : 3.00 ACE EPAM P3 Proton Flux (p/cm^2-s-sr-MeV) : 2.43e+01 Orbit Start Time : 2001:010:12:24:05 Geocentric Distance (km), Orbit Leg : 138828 A CRM Region : 1 (Solar_Wind) External Proton Flux (p/cm^2-s-sr-MeV) : 2.43000000000e+01 Attenuated Proton Flux (p/cm^2-s-sr-MeV) : 0.00000000000e+00 External Proton Orbital Fluence (p/cm^2-sr-MeV) : 1.81391625319e+08 Attenuated Proton Orbital Fluence (p/cm^2-sr-MeV) : 1.80830178513e+07 2) Notes from 9:00am meeting: Operations (Darrell): - 3 supports last 24 hrs, 1 34m, 2 26m (one added) - Intermittant telemetry from DSS-54 during last night's pass (011:0415-0515) attributed to bad weather at station. Had to break data up into 3 different IDR files, but with no loss of data. - Problems with ACA star tracking (see below) observed in the 010:1950 pass prompted the addition of COMM on DSS-46 from 010: 2150 to 2330 Mission Planning (Dan/Ken): - Loads approved for next week - Have done preliminary work on replacing star catalog for next VENUS observation on Saturday (starts at 013:1238 UT). Need Flight Directors approval to build/review/release new loads. - DSN coverage added for next VENUS observation S/C Engineering(Jeff/Eric): - As noted in Rob's shift report, http://asc.harvard.edu/acis/SOT_reports/Jan_10_2001_M538.txt when the 010:1950 pass started it was noted that we had only 2 FIDS and 2 stars, due to the light from VENUS on one side of the ACA FOV. - COMM was added to observe the next VENUS observation and the transition to the HR 1099 field, which went OK. - Recommendation for next VENUS observation was to revise the star selection and get real time COMM. Also, be ready with a CAP to do the OBS in Normal Maneuver Mode if necessary. Telecon at 11am to decide. SOT(Bill): - Radiation levels very low, but full-halo CME reported by LASCO/EIT on SOHO. This may reach us tomorrow or Saturday. - Eric Martin noted that an ACE ground station in Japan was damaged by a snowstorm, so coverage will be somewhat diminished. - Chandra made NPR news this AM - Association of pulsar with historic supernova DSOPS(Jen): - Three quick looks (see below) GOT(Ken): - All OK 3) Quick look data: Seq # ObsID It Target start time SI Grat Comment ---------------------------------------------------------------------------------------------------------- 500176 01999 00 CRAB NEBULA 2001:009:13:47:13.596 25.0 ACIS-S NONE 600162 02028 00 NGC 5204 X-1 2001:009:23:19:33.008 10.0 ACIS-S NONE 100021 02390 00 McNaught-Hartley 2001:010:02:36:52.801 3.5 ACIS-S NONE 4) A meeting was held at 11am to go over options for handling the ACA during the upcoming VENUS observation on Saturday. After a discussion of various options (do nothing/drop the observation/ change the star catalog) it was decided that the observation would be done, in normal point mode, but with modified star catalogs for both acquisition and guide stars, as well as FID lights (this was the approach recommended by the group which considered this yesterday). The VENUS observation will use 8 acquisition stars and 6 guide stars. The stars will be selected to be away from the VENUS image on the ACA and near the edge of the ACA FOV. Only FID lights will be used in the observation. These catalog changes decrease the risk of a failed acquisition and/or loss of Kalman lock and subsequent transition to bright star or normal sun mode. In addition, there is a desire to gather diagnostic data on the effect of the bright object (i. e., VENUS) on the ACA bias. This can only be done by using 8 x 8 readout mode for slots 3, 4 and 5. These slots will be selected for FID light readouts (normally 8 x 8) for the pre and post VENUS observations. For VENUS, FIDs will be placed in slots 3 and 4, and a star will be tracked in 8 x 8 readout mode in slot 5. The VENUS observation and subsequent transition to the next observation will be covered by real-time COMM. Personnel will monitor the number of stars being used in the Kalman filter, and will be prepared to execute a CAP to go to normal maneuver mode should this number drop below 2 (if the number of Kalman stars drops below 2 for 2 minutes, the OBC will try to go to bright star hold mode, and, if this fails, to normal sun mode.) This action would allow us to preserve the running of the load, which would be stopped if we fell out of Kalman lock. We do not expect this to happen, however, with the more robust star catalogs.