NOAA 7

 1981-059A

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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

Yohkoh

 1991-062A

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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.

Tales from the Prom

 https://welib.org/md5/89989c6bd84cf79735f9e3d22bbfdbc7