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STP-R1, also known as USA 185, is an American military (DARPA) technology test/demonstration satellite that was launched by a Minotaur 1 rocket (which is a modified Minuteman 2 ICBM) from Vandenburg AFB at 02:24 UT on 23 September 2005.

The satellite was fitted with two instruments:- an ion gauge and an atomic oxygen sensor. The vehicle will characterize the orbital regime, demonstrate operational feasibility from a command and control standpoint and also from a platform perspective for future DoD missions.

Alternate Names

  • 28871
  • Streak
  • USA 185

Facts in Brief

Launch Date: 2005-09-23
Launch Vehicle: Minotaur 1
Launch Site: Vandenberg AFB, United States
Mass: 417 kg

Funding Agency

  • Defense Advanced Research Projects Agency (United States)


  • Surveillance and Other Military

Additional Information

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

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