16 December 2017 - Mission Day: 8051 - DOY: 350
OPERATIONS
 
Science Operations
 
 

DOY = day-of-the-year; FD = Flight date. Times are in UTC.

    Month Day Year DOY FD Time Event
    JAN 7 1999 7 1133 22:40 SK-12 (in ESR), Delta-V = -8.1 m/s, segment 1/2/3/4 = 5/15/28/15 min, fuel 8.6 kg
    JAN 8 1999 8 1134 15:47 Gyro B Test
    JAN 8 1999 8 1134 19:58 Start reduction of yaw rate
    JAN 15 1999 15 1141 - Reaction wheels spinning and maintenance
    JAN 19 1999 19 1145 18:30 SK-13 (in ESR), Delta-V = - 8.6 m/s, segment 1/2/3: 20/30/20 min, fuel 9.2 kg
    JAN 20 1999 20 1146 - Roll Rate Determination a la Harris
    JAN 26 1999 26 1152 19:00 SK-14 (in ESR), Delta-V =-3.9m/s ; segment 1/2/3 = 5/21/1 min, fuel 4.27 kg
    JAN 28 1999 28 1154 - Flight test of FPSS raw data processing
    JAN 29 1999 29 1155 - Preparation of ESR exit maneuver (ACU & SSU patches)
    JAN 30 1999 30 1156 - ESR exit maneuver
    JAN 30 1999 30 1156 17:45 In RMW (Roll Angle -63 deg); mom mgt 21:10
    JAN 30 1999 30 1156 22:57 DHS Reconfiguration
    FEB 1 1999 32 1158 19:15 SK-15 (in RMW), Delta-V = +0.32 m/s, segment 1/2 = 10/25 min; fuel: 0.27 kg
    FEB 1 1999 32 1158 22:12 DHS Reconfiguration
    FEB 2 1999 33 1159 16:11 Transition Tests RMW/NM
    FEB 2 1999 33 1159 19:12 Back to Normal Mode
    FEB 5 1999 36 1162 15:59 Tape Recorder Maintenance
    FEB 14 1999 45 1171 13:53 ESR-11, by off-pointing
    FEB 18 1999 49 1175 18:52 Back to Normal Mode (Roll Angle -120 deg), mom mgt 15:20
    MAR 3 1999 62 1188 16:05 Mom. Mgmt, 4 segments: yaw/roll/pitch/yaw; final speeds: 600/-750/600 rpm
    MAR 4 1999 63 1189 16:18 Roll by 120 degrees to 0.653; roll trim to -0.109 degrees; 198 arcsec yaw off-set 23:03
    MAR 4 1999 63 1189 - Loss of SSU Patch during S/C roll.
    MAR 5 1999 64 1190 17:35 Mom. Mgmt, 3 segments: pitch/yaw/roll; final sppeds: 2000/2000/-2000 rpm; 20:05 done
    MAR 5 1999 64 1190 20:30 SK-16, Delta V = -11.87 cm/sec; 4 segments: jets 1/2/4/6: 52/52/2/2 sec on-time
    MAR 5 1999 64 1190 21:30 Mom. Mgmt, 3 segments: roll/yaw/pitch; final speeds: 3000/500/-1700 rpm, 22:30 done
    MAR 6 1999 65 1191 19:25 SSU SEU Flag (Fail-over to no roll control); back to normal mode 20:00
    MAR 8 1999 67 1193 16:00 Roll trim by 1645 arcsec (0.45 degrees) for RSL activation at 17:25
    MAR 13 1999 72 1198 - MDI Continuous Coverage, until June 14 at 01:50 UT
    MAR 15 1999 74 1200 16:48 Roll trim by 378.86 arcsec (RSL correction)
    MAR 18 1999 77 1203 - SSU-A: heater for startracker head switched off
    APR 9 1999 99 1225 - RSL preparation on ground changed to skip pixel boundaries
    APR 29 1999 119 1245 19:09 SSU SEU Flag (Fail-over to no roll control); back to Normal Mode 20:26
    MAY 10 1999 130 1256 - MEDOC Campaign #3, run for 3 weeks until May 31, 1999
    MAY 11 1999 131 1257 17:37 Gyro B power off (all 3 gyros are off)
    MAY 18 1999 138 1264 14:00 Mom. Mgmt, 3 segments: roll/pitch/yaw; final speeds: -581/762/1877 rmp; 17:00 done
    MAY 20 1999 140 1266 17:07 SSU SEU flag (Fail-over to no roll control); back to Normal Mode 18:31
    JUNE 11 1999 162 1288 19:49 SSU Staircase Filter changed from 60 to 600 in AOCS Software
    JUNE 14 1999 165 1291 13:10 Tape Recorder Maintenance
    JUNE 17 1999 168 1294 20:30 SK-17, Delta V=0.46 m/sec; 3 segments; jets 2/3/4: 3.5/155/151 sec on-time
    JUNE 17 1999 168 1294 23:00 Mom.Mgmt, 3 segments; roll/pitch/yaw; final speeds: -520/520/1900 rmp, 00:00 done
    JULY 6 1999 187 1313 - Increase Mv threshold when commanding search/track of new star
    JULY 15 1999 196 1322 04:00 MDI Continuous Coverage, planned until July 20, 07:20
    AUG 26 1999 238 1364 07:10 MDI Continuous Coverage, planned until Sep 1, 02:45 UT
    AUG 27 1999 239 1365 12:33 SSU SEU Flag (Fail-over to no roll control); back to Normal Mode 12:42
    SEPT 24 1999 267 1393 - Gyroless Flight Comm: AOCS Software Part 1 upload
    SEPT 27 1999 270 1396 - Gyroless Flight Comm: AOCS Software Part 2 and COBS upload; test of CRP, RMW, NM
    SEPT 28 1999 271 1397 - Gyroless Flight Comm: star swap, P/Y/R profiles in NM, protection functions, Mom mgt.
    SEPT 29 1999 272 1398 - Gyroless Flight Comm: P/Y profiles in CRP, 1st part of 360 deg, roll: 8, 10 and 54 deg.
    SEPT 30 1999 273 1399 - Gyroless Flight Comm: final part of 360 deg. roll: 90, 105 and 90 deg.
    OCT 1 1999 274 1400 - Gyroless Flight Comm: SSU patch, profiles P/Y/R in RMW, fallback to CRP & recovery.
    OCT 2 1999 275 1401 - Gyroless Flight Comm: Mom. Mgt, RW4 maint., Mom. Mgt, SK-18 (delta V=0.05 m/sec)
    OCT 4 1999 277 1403 - Gyroless Flight Comm: test of routine ops (release guide star, RSL uplink, recover star)
    OCT 6 1999 279 1405 - MEDOC Campaign #4, run until October 17.
    OCT 13 1999 286 1412 - MDI Continuous, planned until October 19, 12:45 UT.
    OCT 21 1999 294 1420 - Tape Recorder Maintenance
    NOV 8 1999 312 1438 - Instrument Prep. for Leonids Begins
    NOV 9 1999 313 1439 20:34 Mom. Mgmt, 3 segments: roll/pitch/yaw; final speeds: -600/800/1500 rpm, done 21:48
    NOV 9 1999 313 1439 20:34 MDI Continuous planned until November 16, 13:30 UT
    NOV 16 1999 320 1446 17:20 Leonids roll in CRP: -113.42 deg. to position -120.992 deg.;TM in MR; SSR, SSU off
    NOV 19 1999 323 1449 14:39 Leonids roll back in CRP: -114 deg. to position -6.12 deg.;TM in MR; done 18:30
    NOV 19 1999 323 1449 22:16 Mom. Mgmt, 1 segment: yaw; final speeds: 2106/1439/-2127 rpm, done 23:40
    NOV 20 1999 324 1450 00:20 SK-19, Delta V = 6.8 cm/sec; 4 segments: jets 1/2/4/6: 27.9/28.4/1/1.3 sec on-time
    NOV 20 1999 324 1450 01:00 Mom. Mgmt, 2 segm: pitch/roll: speeds: 2986/511/-1285 rpm, Hx=10.52 Nms: done 01:45
    NOV 22 1999 326 1452 - Instrument Recovery from Leonids Ends
    NOV 28 1999 332 1458 11:55 ESR-12 triggered by ACU Reset Monitoring
    NOV 29 1999 333 1459 18:35 Recovery to CRP, roll angle -125 deg
    NOV 30 1999 334 1460 01:13 Mom. Mgmt, 2 segments: jets 5/2; final speeds: 2021/-2389/1967 rpm, done 23:40
    NOV 30 1999 334 1460 16:20 roll-back by 117.22 deg; to -7.219 deg; done 20:16
    DEC 1 1999 335 1461 15:00 Mom. Mgmt, 3 segments: jets 4/2/5; final speeds: 1750/1750/-1750 rpm, done 16:40
    DEC 1 1999 335 1461 18:00 SK-20, Delta V = 0.364 m/sec; jets 1/2/4/6; 148/151/5/6 sec on-time.
    DEC 1 1999 335 1461 18:09 Guide star loss during station keeping; CRP mode fails to control the roll
    DEC 1 1999 335 1461 18:43 ESR-13, triggered from ground; no roll control in CRP due to ACU TM buffer overrun
    DEC 2 1999 336 1462 19:42 Recovery to CRP, roll angle -67.67 degrees
    DEC 8 1999 342 1468 06:55 MDI continuous contact, planned until Dec 13 at 14 UT
    DEC 8 1999 342 1468 16:45 Mom. Mgmt, 3 segments; jets 5/1/3; final speeds: 730/-1615/2485 rpm, done 17:42
    DEC 8 1999 342 1468 19:52 roll-back by 69.0 deg; to -7.25 deg; done 21:32
    DEC 9 1999 343 1469 12:25 Mom. mgmt, 2 segments: jets 4/2; final speeds: 1624/1622/-1690 rpm, done 13:48
    DEC 9 1999 343 1469 14:05 SK-21, delta v = 0.73 m/s; in 4 segm.; jets 1/2/4/6; final speeds: 1680/1357/-1493 rpm
    DEC 9 1999 343 1469 21:25 Mom. mgmt, 3 segments: jets 4/1/5; final rpm's: 2790/609/-1292, done 23:12; Hx=10.1 Nms
    DEC 10 1999 344 1470 01:00 Back in Normal Mode
    DEC 29 1999 363 1489 17:32 UVCS closed door in anticipation of Y2K problems

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