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Skynet 4A



Skynet 4A, a United Kingdom communications satellite, was launched by the US using the Titan 3 launch vehicle. It was the second in a series of UK Ministry of Defense communications satellites dual-launched with JCSat 2 aboard the first commercial Titan III. It provided jam-proof communications service between fixed and mobile land and sea-based ground stations. The payload housed one four-channel SHF transponder and one two-channel UHF transponder. An EHF transponder was available for propagation experiments. Built by British Aerospace, the satellite measured 2.1m by 1.4m and weighed 1,463 kg at launch. Solar arrays spanning 16m provided 1,200 W of power.

Alternate Names

  • 20401
  • Skynet4A

Facts in Brief

Launch Date: 1990-01-01
Launch Vehicle: Titan III
Launch Site: Cape Canaveral, United States
Mass: 1463 kg
Nominal Power: 1200 W

Funding Agency

  • Ministry of Defence, UK (United Kingdom)


  • Communications

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office

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