SOT Shift Report Shift M574 Duration: 15 Feb 2001 16:40 EST - 15 Feb 2001 18:40 EST 15 Feb 2001 21:40 GMT - 15 Feb 2001 23:40 GMT SOT Lead: Tom Aldcroft Spacecraft/Aspect: FOT/Science Liason: HRC: ACIS: ======================================== Plan ---- Continue with the FEB1201c load: Finish the HRC-S LETG observation to study the soft X-ray spectrum of the stellar coronal source UX Ari, then into perigee. 200074 00597 00 UX ARI 2001:045:19:39:19.750 116.5 HRC-S LETG ---- T_E11 00 CAL-ER 2001:047:04:43:29.897 7.8 -- -- Events ------ 21:40 AOS on DSS-46 23:40 LOS Notes/Issues/Problems --------------------- - ACIS FP temperature -119.9 C - ACE and EPHIN rates low - Still not tracking fid light in slot 2 for obsid 597. The fid light was lost at 2001:046:00:56:48 (VCDU 4942364), when a strong ionizing radiation event disrupted the fid light centroid. The center of the event was completely saturated, as evidenced by the -50 in the image data: -----------SLOT 2 ( 116,-246) ( 65304)------------ | 22 38 55 94 204 110 121 88 | | 33 61 155 409 337 426 492 492 | | 83 171 404 1266 1515 1703 1587 1183 | | 271 813 2694 5454 5586 2583 1377 365 | | 227 1228 3484 3628 2555 829 310 99 | | 116 785 5144 1012 470 260 55 33 | | 348 5343 -50 2555 254 116 44 16 | | 171 2063 5608 1421 149 66 27 5 | --------------------------------------------------- After this frame, the slot was left in the 'LOST,SEARCHING' function (image function = 3), with the image shifted by several pixels: -----------SLOT 2 ( 117,-243) ( 4851)------------ | 16 5 5 10 16 16 10 10 | | 16 21 21 21 81 21 16 10 | | 21 27 38 43 32 48 48 16 | | 38 59 92 191 109 114 92 38 | | 70 147 415 338 431 497 491 147 | | 169 426 1257 1547 1684 1602 1175 202 | | 803 2635 5452 5528 2591 1383 382 103 | | 1170 3384 3663 2537 803 327 98 48 | --------------------------------------------------- This chronology is consistent with previous loss-of-fid events. It occurs because the ACA predicts the next image position based on the current position, even if that position is corrupted. Loss of fids is usually associated with a radiation event that occurs in or near the background pixels. Snapshot -------- Snapshot matches expected configuration UTC 2001:046:22:48:12 (Feb15) f_ACE 3.01e+01 F_ACE 5.57e+06 Kp 1.7 R km 109229D OBT 2001:046:22:47:35 CTUVCDU 5249279 OBC s/w NRML FMT1_NORM CPEstat NORM OBT 98664455.71 ONLVCDU 5249264 OBC Errs 0 OBSID 597 EPState SUN SIM TTpos -99616 HETG Angle 79.84 PCADMODE NPNT RA 51.629 Bus V 30.08 SIM FApos -990 LETG Angle 4.46 PCONTROL NPNT Dec 28.736 Bus I 32.28 AOFSTAR GUID Roll 284.496 ACA Object FFSSSSSS Dither ENAB HRC-I HV OFF ACA ImFunc TTNTTTTT Dith Yang -16.60 Yaw Rate -0.14 HRC-S HV ON ACA CCD Temp -10.4 Dith Zang -19.85 Pitch Rate -0.01 OBSMode OBSV ACA Int Time 1.698 Roll Rate -0.08 Door OP UNAC AOACSTAT OK FSS SunBeta SUN Door CL UNAC FSS Alfa -0.14 Batt 1 SOC 100.00% Avg HRMA Temp 70.61 FSS Beta 0.53 Batt 2 SOC 100.00% ACIS Stat7-0 65 Avg OBA Temp 51.13 SA Resolv 90.37 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 15.46 RadMon ENAB HRMA power 26.80 SCS 128 ACT -Y SA Amps 16.44 EPHIN Geom LARG OBA power 138.30 SCS 129 ACT +Y SA Temp 115.49 E150 2.9 SCS 130 ACT -Y SA Temp 115.85 E300 0.1 Roll Mom. 0.005 SCS 107 INAC E1300 0.0 Pitch Mom. -7.084 UpL Cmd Acc 1140 EPH A-Leak 1.0200 P4GM 0.0 Yaw Mom. 2.949 Cmd Rej A 51 EPH B-Leak 0.2400 P41GM 0.0 UTC 2001:046:22:48:12 (Feb15) f_ACE 3.01e+01 F_ACE 5.57e+06 Kp 1.7 R km 109229D Currently scheduled FPSI, OTG : HRC-S LETG Costello Kp : 1.67 ACE EPAM P3 Proton Flux (p/cm^2-s-sr-MeV) : 3.01e+01 Orbit Start Time : 2001:044:21:34:00 Geocentric Distance (km), Orbit Leg : 109229 D CRM Region : 1 (Solar_Wind) External Proton Flux (p/cm^2-s-sr-MeV) : 3.01000000000e+01 Attenuated Proton Flux (p/cm^2-s-sr-MeV) : 0.00000000000e+00 External Proton Orbital Fluence (p/cm^2-sr-MeV) : 1.14613260890e+09 Attenuated Proton Orbital Fluence (p/cm^2-sr-MeV) : 1.00189303719e+08