Kosmos 955

 1977-091A

---

Kosmos-955
Date	Time	Event	Orbit
1977 Sep 20	0102	Launch by 8A92M	Plesetsk
	0106?	Blok E burn
	0111?	Blok E sep
1977 Nov 16			97.5 630x641x81.2

Spaceflight: November 1977

 https://welib.org/md5/0e7a2621ad78327ff18ba603aa28ee6e

Explorer 47

 1972-073A

---

IMP H (Interplanetary Monitoring Platform H) was the first of a new series of IMP probes placed in distant circular orbits. The IMP H series carried a Star 17A apogee motor to circularize the orbit. The probe, which became Interplanetary Monitoring Platform 7 (Explorer 47), was launched at 0120 on 1972 Sep 23 by Delta 1604 from Cape Kennedy. The Delta delivered the probe to a 153 x 411 km x 28.8 deg parking orbit at 0126. After an 11 min coast the Star 37E third stage ignited at 0137 and placed IMP VII in a 248 x 254800 km x 28.6 km orbit. The Star 17A solid motor fired at first apogee placing IMP 7 in a 201100 x 235600 km x 17.2 deg orbit. The satellite operated until 1978 Oct 31 when it was switched off.

Mass was 390 kg launch 1.58m high 1.36m dia. 16-sided cylinder with two 3.4m experiment booms and two 1.2m attitude control system booms for an estimated span of 8.2m. Star 17A was 124 kg full 12 kg empty 0.71m dia. The Delta 1604 introduced the extended long tank booster.

IMP 7
Date	Time	Event	Orbit
1972 Sep 23	0120:00	Launch by Delta 1604	CC
	0120:00	T+0:00 SRM 1-6 burn
	0120:39	T+0:34 SRM 1-6 burnout
	0121:25	T+1:25 SRM sep
	0124:28	T+4:28 MECO
	0124:34	T+4:34 VECO
	0124	T+4:36 St 1 (S/N 20006) sep
	0124:40	T+4:40 SES-1
	0124:57	T+4:57 Fairing sep
	0130:12	T+10:12 SECO-1	153 x 411 x 28.8
	0135:31	T+15:31 St 2 sep
	0135:45	T+15:45 Star 37C burn 43.6s
	0136:27	T+16:27 Star 37C burnout
	0138:09	T+18:09 Star 37C sep	248 x 254800 x 28.6
	0138:11	Star 37C yo weight release
	247 x 237796 x 28.6 (MOR Post)
1972 Sep 23	1815	Pass EL1:4
1972 Sep 25	1536	Star 17A burn
	Star 17A burnout	201100 x 235600 x 17.2
	1930?	ACS burn to reduce spin rate
		Boom deploy	207836 x 235558 x 17.72 (FFR)
1972 Sep 26		Begin experiment turnon
1978 Sep 30		end of operations (TM-80758)
1978 Oct 31		end of tx

Payload:

• H1 Magnetometer (GSFC/Ness)

• H2 Electric and magnetic fields (TRW/Scarf) Plasma Wave Experiment, AC Electric and magnetic fields (TRW/Scharf), 3.1m boom with loop antenna and 61cm dipole antenna

• H3 LASL electrostatic analyser (LASL/Bame) e 4 eV-20 keV, p 70 eV -20 keV.

• H4 Faraday cup (MIT/Bridge) e 17 ev-7 keV, p 50 eV-7 keV.,

• H5 GSFC electrostatic analyser (GSFC/Olgivie)

• H6 Crystal scintillator (GSFC/Cline) Solar Electrons and solar flare X-rays (GSFC/Cline), e 100 keV-2 MeV; X-rays 20 keV-1 MeV

• H7 LEPEDEA (Iowa/Frank)

• H8 U Md. SSD (UMd/Gloeckler) Ions and electrons, electrostatic analyser

• H9 SS and GM detectors (APL/Krimigis)

  • Solar and galactic X-ray detector 1.75-16A with GM tubes

• H10 SS and Scint. telescopes (GSFC/McDonald)

• H11 Chicago solid state telescope (Chicago/Simpson)

• H12 CIT solid state telescope (CIT/Stone) Electrons and Isotopes, solid state telescope 0.16-2.8 Mev e, 0.5-40 Mev/n (Caltech/Stone)

Teen: February 1978

 https://welib.org/md5/c74e35db3d14ca11f31599a6c608ed89