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astronautix.com HS 393


Class: Communications. Nation: USA. Manufacturer: Hughes.

Domestic communication. Launching states: Japan, France, USA. At the time, these were the largest commercial spacecraft ever built. The series were also the first commercial satellites to employ Satellite Switched/Time Division Multiple Access (SS/TDMA) techniques. Spin stabilised with despun antenna. Hydrazine propulsion system. Passive thermal control. Telescoping dual-cylinder structure with deployed antennas. Body mounted solar cells generate 2250 W (EOL). Solar drums are each about 6m tall. 38 (plus 12 backup) C-Band and 10 (plus 4 backup) Ku-Band transponders.120,000 telephone calls and 3 colour TV broadcasts simultaneously.


Specification

Design Life: 13 years. Total Length: 11.8 m. Maximum Diameter: 3.6 m. Total Mass: 4,330 kg.


HS 393 Chronology


06 March 1989 JCSAT 1 Program: JCSAT. Launch Site: Kourou . Launch Vehicle: Ariane 44LP. Mass: 2,280 kg. Perigee: 35,781 km. Apogee: 35,794 km. Inclination: 0.0 deg.

Japanese domestic communications; 150 deg E. Domestic communication. Launching states: Japan, France, USA. Launch vehicle Ariane 29 (Ariane IV). Launching organization ARIANE SPACE. Launch time 1129 GMT.


27 October 1989 Intelsat 6A F-2 Program: Intelsat. Launch Site: Kourou . Launch Vehicle: Ariane 44L. Mass: 4,215 kg. Perigee: 35,691 km. Apogee: 35,900 km. Inclination: 0.1 deg.

Stationed at 24.5 deg E. At the time, the Intelsat 6 series were the largest commercial spacecraft ever built. The series were also the first commercial satellites to employ Satellite Switched/Time Division Multiple Access (SS/TDMA) techniques. Spacecraft: Based on Hughes 393 bus. Spin stabilised with despun antenna. Hydrazine propulsion system. Passive thermal control. Telescoping dual-cylinder structure with deployed antennas. Body mounted solar cells generate 2250 W (EOL). Solar drums are each about 6m tall. Payload: 38 (plus 12 backup) C-Band and 10 (plus 4 backup) Ku-Band transponders.120,000 telephone calls and 3 colour TV broadcasts simultaneously. SS/TDMA (Satellite-Switched Time Division Multiple Access) techniques used.


01 January 1990 JCSAT 2 Program: JCSAT. Launch Site: Cape Canaveral . Launch Vehicle: Titan 34D. Mass: 2,280 kg. Perigee: 35,781 km. Apogee: 35,795 km. Inclination: 0.0 deg.

Japanese domestic communications; 154 deg E. Domestic communications. Launching organization Martin Marietta. Launch time 0007 GMT.


14 March 1990 Intelsat 6 F-3 Program: Intelsat. Launch Site: Cape Canaveral . Launch Vehicle: Titan 34D. FAILURE: Second stage failed to separate due to a wiring error in the stage separation electronics, stranding the payload in low earth orbit. Mass: 4,215 kg. Perigee: 35,786 km. Apogee: 35,790 km. Inclination: 0.0 deg.

Second stage separation failure; unusable orbit.


23 June 1990 Intelsat 6 F-4 Program: Intelsat. Launch Site: Cape Canaveral . Launch Vehicle: Titan 34D. Mass: 4,215 kg. Perigee: 35,780 km. Apogee: 35,792 km. Inclination: 0.0 deg.

International communications; 63 deg E.


14 August 1991 Intelsat 6 F-5 Program: Intelsat. Launch Site: Kourou . Launch Vehicle: Ariane 44L. Mass: 4,296 kg. Perigee: 35,782 km. Apogee: 35,793 km. Inclination: 0.1 deg.

International communications; 14.5 deg W.


29 October 1991 Intelsat 6A F-1 Program: Intelsat. Launch Site: Kourou . Launch Vehicle: Ariane 44L. Mass: 4,330 kg. Perigee: 35,784 km. Apogee: 35,791 km. Inclination: 0.0 deg.

International communications; 27.5 deg W.



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Last update 12 March 2001.
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© Mark Wade, 2001 .