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astronautix.com Intelsat 4

Intelsat 4
Intelsat 4 -

Credit: Intelsat. 22,128 bytes. 274 x 340 pixels.



Class: Communications. Nation: International. Agency: ITSO. Manufacturer: Hughes.

The Intelsat 4 series continued the growth of the Intelsat communications network. 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 stabilised 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.


Specification

Design Life: 7 years. Total Length: 5.3 m. Maximum Diameter: 2.4 m. Total Mass: 1,410 kg.


Intelsat 4 Chronology


26 January 1971 Intelsat 4 F-2 Program: Intelsat. Launch Site: Cape Canaveral . Launch Vehicle: Atlas Centaur SLV-3C. Mass: 706 kg. Perigee: 36,140 km. Apogee: 36,246 km. Inclination: 13.2 deg.

Stationed at 24.5 deg W. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle put payload into geosynchronous transfer orbit


20 December 1971 Intelsat 4 F-3 Program: Intelsat. Launch Site: Cape Canaveral . Launch Vehicle: Atlas Centaur SLV-3C. Mass: 1,410 kg. Perigee: 35,930 km. Apogee: 36,009 km. Inclination: 11.1 deg.

Over Atlantic. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle put payload into geosynchronous transfer orbit


23 January 1972 Intelsat 4 F-4 Program: Intelsat. Launch Site: Cape Canaveral . Launch Vehicle: Atlas Centaur SLV-3C. Mass: 1,410 kg. Perigee: 35,905 km. Apogee: 35,917 km. Inclination: 10.5 deg.

Over Pacific. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle put payload into geosynchronous transfer orbit


13 June 1972 Intelsat 4 F-5 Program: Intelsat. Launch Site: Cape Canaveral . Launch Vehicle: Atlas Centaur SLV-3C. Mass: 1,410 kg. Perigee: 35,811 km. Apogee: 35,847 km. Inclination: 11.3 deg.

Over Indian Ocean. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle put payload into geosynchronous transfer orbit


23 August 1973 Intelsat 4 F-7 Program: Intelsat. Launch Site: Cape Canaveral . Launch Vehicle: Atlas Centaur SLV-3D. Mass: 1,410 kg. Perigee: 36,080 km. Apogee: 36,132 km. Inclination: 10.4 deg.


Intelsat 4Intelsat 4

Credit: Intelsat. 17,887 bytes. 202 x 336 pixels.


Over Atlantic Ocean. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle put payload into geosynchronous transfer orbit
21 November 1974 Intelsat 4 F-8 Program: Intelsat. Launch Site: Cape Canaveral . Launch Vehicle: Atlas Centaur SLV-3D. Mass: 1,410 kg. Perigee: 35,907 km. Apogee: 35,944 km. Inclination: 8.8 deg.

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle put payload into geosynchronous transfer orbit


20 February 1975 Intelsat 4 F-6 Program: Intelsat. Launch Site: Cape Canaveral . Launch Vehicle: Atlas Centaur SLV-3D. FAILURE: Staging electrical disconnect. Mass: 1,410 kg.

Staging electrical disconnect. Launch vehicle was to have put payload into geosynchronous transfer orbit


22 May 1975 Intelsat 4 F-1 Program: Intelsat. Launch Site: Cape Canaveral . Launch Vehicle: Atlas Centaur SLV-3D. Mass: 727 kg. Perigee: 36,016 km. Apogee: 36,128 km. Inclination: 8.9 deg.

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle put payload into geosynchronous transfer orbit



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Last update 12 March 2001.
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