Opera

 https://welib.org/md5/4d730561076e8c7c6bf75601c9427897

Secret Sentries In Space

 https://welib.org/md5/0019d4abe4a4d977dc8132802699ce6d

ESRO 1A

 1968-084A

---

The ESRO IA satellite was developed by the Laboratoire Central de Telecommunications to study polar ionospheric and auroral phenomena. It was launched in Oct 1968 by a NASA Scout into polar orbit. Control by ESTRAC. Mass 85 kg.

The satellite was 0.76m dia 0.93m high cylinder, 1.53m high including the boom; 2.43m span across antennae. Two 0.1 kg yo-yo weights on 4.5m wires were ejected.

ESRO IA
Date	Time	Event	Orbit
1968 Oct 3	2049:39	Launch by Scout B S167C	V SLC5
	2050:47	Algol burnout T+1:08
	2050:58	Castor burn T+1:19
	2051:36	Castor burnout T+1:57
	2052:35	Antares burn T+2:56
	2052:35	Heatshield sep T+2:56
	2053:09	Antares burnout T+3:30
	2053:16	Coast T+3:37
		Antares sep T+5:56
	2055:42	FW4S burn T+6:00 30.6s
	2056:12	FW4S burnout T+6:34
	2101:03	FW4S sep T+11:26
		T+11:28 S-44 boom deploy
	2101:11	T+11:32 Yo-yo weights
		T+11:34 S-45 boom deploy
			103.0 258 x 1538 x 93.8
1970 Jun 26		Reentered

Payload:

• S32 Auroral photometer 4278A and 4861A (NICP-Oslo/Egeland)

• S44 Electron probes (UCL/Willmore)

• S45 Ion probe (UCL/Willmore)

• S71A Scintillator and pulse analyser, e 40-400 keV (RSRS/Dalziel)

• S71B Electrostatic analyser, e 1-10 keV, p 1 -5 keV (KGO/Riedler)

• S71C Solid state detectors p 100 keV-5 MeV (Bergan/Sorass)

• S71D GM counters e > 40 keV (NDRE/Skovli)

• S71E Scintillator and solid state detector p 5-30 MeV (RSRS/Dalziel)

Space handbook: astronautics and its applications

 https://welib.org/md5/55a42a99f015b463751dcce897c214e2

Aviation Week: April 24,1972

 https://welib.org/md5/b0d7c97999d49715517f81bf50ebc4f0