SOT Shift Report Shift M487 Duration: 20 Nov 2000 18:00 EST - 20 Nov 2000 23:00 EST 20 Nov 2000 23:00 GMT - 21 Nov 2000 04:00 GMT SOT Lead: Tom Aldcroft Spacecraft/Aspect: Rob Cameron FOT/Science Liason: Eric Martin HRC: ACIS: ======================================== Plan ---- Perform ACA dark current measurement following "SOP ACA DARK CURRENT MEASUREMENT". This procedure involves maneuvering to a field with a very low star density and no stars brighter than 9th mag, then executing a series of ACA full frame readouts at slightly different attitudes. This is the first successful ACA dark current measurement since SSD opening. Events ------ 23:55 AOS on DSS-24 00:38 Maneuver to dark field RA,Dec,Roll = 30.857143, -38.2500, 332.565813 00:52 - 01:02 Dark cal replica #0 01:29 Maneuver to replica #1 attitude (Delta dec = +2 arcmin) 01:31 - 01:41 Dark cal #1 01:59 Maneuver to replica #2 attitude (Delta dec = -2 arcmin) 02:07 - 02:17 Dark cal #2 02:33 Maneuver to replica #3 attitude (Delta RA = +2 arcmin) 02:39 - 02:49 Dark cal #3 03:06 Maneuver to replica #4 attitude (Delta RA = -2 arcmin) 03:13 - 03:23 Dark cal #4 03:59 Procedure complete, Chandra returned to initial attitude for load continuity Notes/Issues/Problems --------------------- - ACA workstation initially not receiving telemetry; connection was re-established by GOT - Procedure ran very smoothly and there were no anomalies - Telemetry quality generally very good, and we expect good results. CFC counts were noted at least once per 5 minutes during the entire procedure. Each transition from VC1 to VC2 (or vice-versa) generated large jumps (8000 - 10000), but during the actual cal the counts did not increment. - Four of the five cal datasets already in-house (at GOT) - Radiation low Snapshot -------- UTC 2000:326:03:47:01 (Nov21) f_ACE 3.16e+01 F_ACE 2.52e+06 Kp 1.7 R km 38445D OBT 2000:326:03:46:27 CTUVCDU 9539839 OBC s/w NRML FMT2_EPS CPEstat NORM OBT 91165587.98 ONLVCDU 9539824 OBC Errs 11 OBSID 61847 EPState SUN SIM TTpos -99616 HETG Angle 79.84 PCADMODE NMAN RA 30.485 Bus V 29.93 SIM FApos -467 LETG Angle 78.34 PCONTROL NPNT Dec -39.019 Bus I 33.55 AOFSTAR GUID Roll 332.435 ACA Object SSSSSSSS Dither DISA HRC-I HV OFF ACA ImFunc NTNTTNRN Dith Yang 0.00 Yaw Rate 5.14 HRC-S HV ON ACA CCD Temp -10.4 Dith Zang 0.00 Pitch Rate 42.65 OBSMode NEXT ACA Int Time 1.698 Roll Rate 5.00 Door OP UNAC AOACSTAT OK FSS SunBeta SUN Door CL UNAC FSS Alfa -0.52 Batt 1 SOC 100.00% Avg HRMA Temp 70.58 FSS Beta -26.35 Batt 2 SOC 100.00% ACIS Stat7-0 66 Avg OBA Temp 50.89 SA Resolv 116.44 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 15.85 RADMON DISA HRMA power 46.60 SCS 128 ACT -Y SA Amps 17.23 EPHIN Geom SMAL OBA power 43.60 SCS 129 ACT +Y SA Temp 115.85 E150 1464195.1 SCS 130 ACT -Y SA Temp 115.85 E300 20794.4 Roll Mom. -3.812 E1300 173.8 Pitch Mom. -4.853 UpL Cmd Acc 60445 EPH A-Leak 0.7320 P4GM 56888.9 Yaw Mom. -2.372 Cmd Rej A 136 EPH B-Leak 0.1280 P41GM 0.3 Current Data: UTC 2000:326:03:47:01 (Nov21) f_ACE 3.16e+01 F_ACE 2.52e+06 Kp 1.7 R km 38445D Currently scheduled FPSI, OTG : HRC-S NONE Costello Kp : 1.67 ACE EPAM P3 Proton Flux (p/cm^2-s-sr-MeV) : 3.16e+01 Orbit Start Time : 2000:323:14:59:01 Geocentric Distance (km), Orbit Leg : 38912 D CRM Region : 3 (Magnetosphere) External Proton Flux (p/cm^2-s-sr-MeV) : 2.21110841810e+04 Attenuated Proton Flux (p/cm^2-s-sr-MeV) : 0.00000000000e+00 External Proton Orbital Fluence (p/cm^2-sr-MeV) : 1.92860300384e+09 Attenuated Proton Orbital Fluence (p/cm^2-sr-MeV) : 7.65775153846e+08