Saturday, October 5, 2002
Friday, October 4, 2002
NOAA 7
1981-059A
NOAA C (NOAA 7) was launched at 1053 on 1981 Jun 23 by Atlas F from SLC 3W at Vandenberg. The kick motor fired at 1103, placing NOAA 7 into a 101.9 min, 843 x 862 km x 98.9 deg orbit. NASA handed over the satellite to NOAA on 1981 Jul 13.
| NOAA 7 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1981 Jun 23 | 1052:59 | Launch by Atlas F | V SLC3W |
| T+2:01 BECO | |||
| T+2:04 BPJ Booster Package Jettison | |||
| T+2:24 NFJ Nose Fairing Jettison | |||
| T+5:24 SECO | |||
| T+5:43 VECO | |||
| 1058:48 | T+5:49 Atlas sep | ||
| 1103:26 | T+10:27 Star 37 burn | ||
| 1104:09 | T+11:10 Star 37 burnout | ||
| T+11:15 RCS start | |||
| T+11:38 RCS stop | |||
| T+14min Hydrazine blowdown | |||
| T+30min arrays and booms deployed | |||
| 101.9 843 x 862 x 98.9 | |||
| 1981 Jul 13 | Handover to NOAA | ||
| 1985 Feb 7 | radiometer failed | ||
| 1986 Jun | Power system failed | ||
| 1987 Mar 31 | Decommissioned | ||
Monday, September 30, 2002
Yohkoh
1991-062A
The Solar-A satellite was launched in Aug 1991. It was renamed Yohkoh (`Sunlight'). Yohkoh returned daily X-ray images of the Sun with the NASA soft X-ray telescope.
After 10 years in space, Yohkoh lost attitude control during a solar eclipse which happened at a time of poor ground communications; the batteries drained to a low state and the spacecraft is oriented in a way that keeps them cold. Yohkoh was decommissioned the following year.
| Yohkoh | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1991 Aug 30 | 0230 | Launch by Mu 3S2 | KASC |
| T+0:40 SOB sep | |||
| T+1:24 Stage 1 cutoff, sep | |||
| T+1:26 Stage 2 start | |||
| T+2:36 Stage 2 cutoff, coast | |||
| T+2:35 Fairing | |||
| 0233 | T+3:15 Stage 3 spinup | ||
| 0234 | T+4:00 Stage 2 sep | ||
| 0237 | T+7:13 Stage 3 burn 87s? at 570 km | ||
| 0238 | T+8:40? M3B rocket cutoff | ||
| 0239 | T+9:30 M3B sep | ||
| 0239 | T+9:40 Yo-yo despin | ||
| 520 x 770 x 31.3 | |||
| 1991 Nov 20 | 97.87 522 x 791 x 31.3 | ||
| 2001 Dec 14 | Discharged batteries during eclipse | ||
| 2002 Jun | end of ops | ||
Payload:
- HXT Hard imaging XR telescope ISAS 10-100 keV, 8" res. (Fourier synthesis telescope; 64 PMT array )
- SXT Soft imaging XR telescope NASA-MSFC/LPARL 2" resolution 0.25 - 4 keV, 4-50A, 1.6m focal length Nariai-Werner, with CCD. Aperture 1 cm?
- BCS Bragg crystal spectrometer ISAS/UK; 1.8-5A
- WBXS Wide band soft X spectrometer ISAS 2 keV - 100 MeV.
October 1,2026
https://planet4589.org/space/jsr/back/news.860.txt
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