Jan_10_2000_L171.txt Shift L171 Start at 2000:010:13:00:00 GMT = 2000 Jan 10 8:00am EST End 2000 Jan 10 12:00pm EST See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Jan_10_2000_L171.txt SOT Lead Bill Podgorski SOT SC/ACA FOT-SI HRC-SI ACIS-SI OTHER Plan: - Running load JAN0900B load, ACIS-S/HETG Observation 459 On downward leg: 2000:008:22:25:29.004 58 EPERIGEE ORBIT PERIGEE 2000:010:06:08:45.411 59 EAPOGEE ORBIT APOGEE 2000:011:13:53:13.742 59 EPERIGEE ORBIT PERIGEE EVENTS DONE OBSID -------------- ---- ----- Start Shift 010:1300 Status at last COMM was nominal (See note 1) AOS DSS-66 (Madrid) 010:1350 459 (see note 3) Chandra status at AOS was nominal (see note 2) LOS DSS-66 010:1540 End of shift 010:1600 NOTES/ISSUES/PROBLEMS --------------------- 1) From Snapshot browser: UTC 2000:010:08:01:01 (Mon Jan 10) f_ACE 3.88e+03 F_ACE 3.80e+07 R km 144675D OBT 2000:010:07:59:37 CTUVCDU 1861375 OBC s/w NRML FMT2_NORM CPEstat OBT 63878377.58 ONLVCDU 1861368 OBC Errs 0 OBSID 459 EPState SUN SIM TTpos 74423 HETG Angle 6.7 PCADMODE NPNT RA 187.285 Bus V 30.24 SIM FApos -467 LETG Angle 79.1 PCONTROL NPNT Dec 2.026 Bus I 31.27 AOFSTAR GUID Roll 67.766 ACA Object FFFSSSSS Dither ENAB HRC-I HV OFF ACA ImFunc TTTTTTTT Dith Yang -7.36 Yaw Rate -0.11 HRC-S HV ON ACA CCD Temp -10.4 Dith Zang 5.08 Pitch Rate 0.02 OBSMode NEXT ACA Int Time 1.698 Roll Rate 0.27 Door OP ACT AOACSTAT OK FSS SunBeta SUN Door CL UNAC FSS Alfa -0.32 Batt 1 SOC 100.00% Avg HRMA Temp 70.61 FSS Beta -13.73 Batt 2 SOC 100.00% ACIS Stat7-0 64 Avg OBA Temp 50.89 SA Resolv 103.64 Batt 3 SOC 100.00% Cold Rad -120.7 OBA Tavg Fault NFLT SA Sun Pres ILLM Warm Rad -82.0 OBA Trng Fault NFLT +Y SA Amps 14.88 HRMA power 32.70 -Y SA Amps 16.25 EPHIN Geom LARG OBA power 67.40 +Y SA Temp 116.95 E1300 7 -Y SA Temp 116.58 P4GM 36 Roll Mom. 1.310 P41GM 0 Pitch Mom. -5.240 UpL Cmd Acc 61558 A-Leak 0.3520 Yaw Mom. -7.836 Cmd Rej A 48 B-Leak 0.0560 Expected RA, Dec, Roll (degrees): 187.28512, 2.02856, 67.76597 2) Chandra's state at AOS 010:1350 was: WAS EXPECTED PCAD MODE = NPNT NPNT CONTROL LAW FLAG = NPNT NPNT Stars: = 5 5 FIDS = 3 3 RA = 187.285104 deg 187.285104 DEC = 2.028563 deg 2.028563 ROLL = 67.765974 deg 67.765974 Format = 2 2 OBSID = 459 459 SIM FA = -467 -468 SIM TSC = 74423 (ACIS-S) 74427 HETGA = 6.71 deg (IN) IN HETGB = 6.71 deg (IN) IN LETGA = 80.21 deg (OUT) OUT LETGB = 79.08 deg (OUT) OUT EPHIN A-leak = 0.3680 B-leak = 0.0560 HRC SP PS = ON IM PS = OFF SP Top Step = 43 Sp Bot Step = 54 Shield 1 HV = OFF Shield 2 HV = ON Valid Event Rate 1 = 0 Valid Event Rate 2 = 0 Shield 2 Event Rate = ~4500 ACIS FP Temp = -109.0 DEA Pwr = 49.8 DPA Pwr = 40.9 GSE Status = Clocking data 3) Trouble establishing communications thru DSS-66. A DR will be written. 4) 9:00am Meeting Notes: Enhanced Dither Mode: Dan Shropshire co-ordinating efforts to complete this activity. Will be meeting 10am Thursday on this topic. Expect to get this approved at FDB meeting Jan 17. EPS Patches: Wallace Jackson reported that 3 patches to the EPS software will be implemented, primarily to raise the number of battery disconnect "glitches" (signal from hardware to disconnect batteries from bus with batteries already disconnected) that are required before the battery disconnect circuit is disabled by software. These glitches can occur on exiting from eclipse as one array wing warms up faster and its circuit disconnects the batteries from the bus, then the other one warms up and gives the same command, with the batteries already off-line. Gyro Current Anomaly Telecon: Jeff Shirer reported that a telecon will be held today at 4:00pm on the subject of the IRU1 gyro current anomalies which were observed on days 269 and 314. No quick looks today.