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USA 279



Satellite Data System (SDS) spacecraft are communication relay satellites for transmitting real-time data from US reconnaissance satellites (e.g. KH-11, Onyx, Topaz). They are also used for communications to USAF aircraft and connect the various ground stations of the Air Force Satellite Control Network (AFSCN). The spacecraft relay the downlinked data to a ground station at Fort Belvoir, Virginia.

Alternate Names

  • USA279
  • 42949
  • NROL 52
  • SDS 4 2

Facts in Brief

Launch Date: 2017-10-15
Launch Vehicle: Atlas V
Launch Site: Cape Canaveral, United States

Funding Agency

  • National Reconnaissance Office (United States)


  • Communications

Additional Information

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

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