12 December 2017 - Mission Day: 8047 - DOY: 346
OPERATIONS
 
Science Operations
 
 

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

    Month Day Year DOY FD Time Event
    JAN 8 1998 8 769 - OBT Frequency Adjustment
    JAN 9 1998 9 770 18:00 MDI Continuous Coverage, 3 month (until April 9)
    JAN 30 1998 30 791 01:54 Fail-over to Gyro Mode (2 hours in RMW)
    FEB 27 1998 58 819 23:49 Fail-over to Gyro Mode (1 hr, 42 min in RMW)
    MAR 2 1998 61 822 14:00 New Telemetry Subformat 3 test, ran until Warm Start-up
    MAR 3 1998 62 823 09:02 DHSS Warm Start-Up
    MAR 3 1998 62 823 19:03 ESR-3 by off-pointing
    MAR 3 1998 62 823 22:53 ESR-4 by roll rate; back to Normal Mode: March 5 at 00:04 UT
    MAR 14 1998 73 834 - OBT Frequency Adjustment.
    MAR 25 1998 85 846 2:40 VIRGO "safe" mode (low power) until Mar. 26, @00:00
    APR 8 1998 98 859 - OBT Frequency Adjustment.
    APR 10 1998 100 861 11:13 Fail-over to Gyro Mode (2 hrs 26 min in RMW)
    APR 17 1998 107 868 18:52 Station Keeping Maneuver (SK08), 11 min burn,1.5kg fuel, 1.4m/s on +X
    APR 20 1998 110 871 3:58 Fail-over to Gyro Mode (2 hrs in RMW)
    MAY 1 1998 121 882 17:35 Fail-over to Gyro-Mode (1 hr, 20 min in RMW)
    MAY 1 1998 121 882 18:05 MDI Continuous Coverage (until May 7, 21:30 UT)
    JUN 11 1998 162 923 15:25 MDI Continuous Coverage (until June 18, 05:30 UT)
    JUN 24 1998 175 936 23:16 ESR-5 by (false) roll rate
    JUN 25 1998 176 937 02:35 ESR-6 by roll rate
    JUN 25 1998 176 937 04:38 ESR-7 by off-pointing
    JUN 25 1998 176 937 04:43 Loss of Telemetry
    JUL 23 1998 204 965 10:00 RADAR from DSN & Arecibo determine SOHO position and Spin Rate
    AUG 3 1998 215 976 22:51 SOHO Telemetry carrier signal received by DSN
    AUG 8 1998 220 981 23:14 Reception of Telemetry, Batteries charging
    AUG 12 1998 224 985 23:39 Begin of hydrazine tank thawing
    AUG 28 1998 240 1001 23:02 Completion of hydrazine tank thawing
    AUG 30 1998 242 1003 - Begin of hydrazine lines thawing
    SEP 16 1998 259 1020 05:45 Begin of Attitude Recovery
    SEP 16 1998 259 1020 18:29 ESR-8 (Commanded as part of the recovery
    SEP 16 1998 259 1020 18:30 SOHO locks onto the sun
    SEP 22 1998 265 1026 19:35 ESR-9 by (false) off-pointng
    SEP 22 1998 265 1026 21:32 DHSS Warm start-up
    SEP 23 1998 266 1027 16:58 Attitude Control in Roll Maneuver Wheels Mode
    SEP 25 1998 268 1029 17:30 SK-9, Delta-V = -6.21 m/sec, 45.5 min burn, 6.7 kg fuel (in 2 segments)
    SEP 25 1998 268 1029 19:52 Attitude Control in Normal Mode
    OCT 01 1998 274 1035 12:15 SSU Patch, repeated on Oct.2
    OCT 04 1998 277 1038 13:15 Fail-over to Gyro Mode (0.5 hrs in RMW)
    OCT 05 1998 278 1039 - Instrument Recommissioning Begins
    OCT 07 1998 280 1041 18:52 Offset -198 arcsec
    OCT 07 1998 280 1041 ?? Fail-over to Gyro Mode (0.5 hrs in RMW)
    OCT 12 1998 286 1047 17:26 Fail-over to Gyro Mode (0.5 hrs in RMW)
    OCT 13 1998 287 1048 15:46 OSR & FPSS duty cycle to 20%, to zero Oct 14
    OCT 16 1998 289 1050 21:42 Mom. Mgmt. (-666/602/2357) & roll trim from 53 to 3 deg
    OCT 16 1998 289 1050 - SK-10, Delta-V = 2.4 m/sec
    OCT 17 1998 290 1051 08:17 Fail-over to Gyro Mode (1.7 hrs in RMW)
    OCT 17 1998 290 1051 18:52 Fail-over to Gyro Mode (0.4 hrs in RMW)
    OCT 17 1998 290 1051 21:11 Fail-over to Gyro Mode (0.6 hrs in RMW)
    OCT 19 1998 292 1053 18:17 Close LV-B
    OCT 23 1998 296 1057 15:35 X-Panel duty cycle decreased by 20% (TCS2, TCS3)
    NOV 04 1998 308 1069 - Instrument Recommissioning Ends
    NOV 12 1998 316 1077 - Instrument Prep. for Leonids Begins
    NOV 13 1998 317 1078 19:46 Mom. Mgmt (-719/911/1173) & SK 11 (2m/sec)
    NOV 15 1998 319 1080 18:30 Roll to -120 degrees (protect for Leonids)
    NOV 20 1998 324 1085 - SSU Patch; this time successful
    NOV 22 1998 326 1087 - Instrument Recovery from Leonids Ends
    DEC 21 1998 355 1116 17:49 ESR-10 by off-pointing (loss of the last gyro)
    DEC 21 1998 355 1116 23:30 Started with roll rate braking (thruster 5B)

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