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Intelsat 4
Part of HS 312 / HS 351 / HS 353
Intelsat 4
Intelsat 4
Credit: Intelsat
American communications satellite. The Intelsat 4 series continued the growth of the Intelsat communications network. Built by Hughes for Intelsat, International. Launched 1971 - 1975. Used the HS-312 bus.

Status: Operational 1971. First Launch: 1971-01-26. Last Launch: 1975-05-22. Number: 8 . Gross mass: 1,410 kg (3,100 lb). Height: 5.30 m (17.30 ft).

The series included the first commercial communications satellite built outside of the United States (F4 was assembled by British Aircraft Corporation). Operational lifetimes were: F1 - 3 years for ITSO, then leased out; F2 - 12 years; F3 - 12 years, then placed into orbital storage; F4 - over 7 years; F5 - over 7 years ; F6 - 0 years (failed to orbit); F7 - over 6 years, then placed into orbital storage; F8 - 9 years (?). Spacecraft: Spin stabilized with a despun antenna structure. Hydrazine propulsion system. Passive thermal control. Body mounted solar cells. Payload: Twelve transponders. Multiple access.4000 voice circuits or 2 TV channels.


More at: Intelsat 4.

Subtopics

Intelsat 4A American communications satellite. Intelsat 4A satellites increased satellite capacity to 7250 voice circuits or 2 TV channels. Built by Hughes for Intelsat, International. Launched 1975 - 1978. Used the HS-353 bus.

Family: Communications, Geosynchronous orbit. Country: USA. Engines: SVM-4. Launch Vehicles: Atlas, Atlas SLV-3C Centaur, Atlas SLV-3D Centaur. Projects: Intelsat. Launch Sites: Cape Canaveral, Cape Canaveral LC36A, Cape Canaveral LC36B. Agency: Hughes. Bibliography: 126, 2, 278, 6, 5020, 12664.
Photo Gallery

Intelsat 4 F-1Intelsat 4 F-1
Credit: Manufacturer Image


Intelsat 4Intelsat 4
Credit: Intelsat



1971 January 26 - . 00:36 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36A. LV Family: Atlas. Launch Vehicle: Atlas SLV-3C Centaur.
1971 December 20 - . 01:10 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36A. LV Family: Atlas. Launch Vehicle: Atlas SLV-3C Centaur.
1972 January 23 - . 00:12 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36B. LV Family: Atlas. Launch Vehicle: Atlas SLV-3C Centaur.
1972 June 13 - . 21:53 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36B. LV Family: Atlas. Launch Vehicle: Atlas SLV-3C Centaur.
1973 August 23 - . 22:57 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36A. LV Family: Atlas. Launch Vehicle: Atlas SLV-3D Centaur.
1974 November 21 - . 23:43 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36B. LV Family: Atlas. Launch Vehicle: Atlas SLV-3D Centaur.
1975 February 20 - . 23:35 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36A. LV Family: Atlas. Launch Vehicle: Atlas SLV-3D Centaur. FAILURE: Staging electrical disconnect.. Failed Stage: U.
1975 May 22 - . 22:04 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36A. LV Family: Atlas. Launch Vehicle: Atlas SLV-3D Centaur.

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