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Cosmos 521



Cosmos 521 was an ASAT target launched to test modifications to ASAT interceptor. Interceptor launch cancelled due to technical failure in target telemetry system. Signature of SALT treaty in May 1972 resulted in military being ordered to discontinue further ASAT tests.

Alternate Names

  • 06206
  • Cosmos521

Facts in Brief

Launch Date: 1972-09-29
Launch Vehicle: Kosmos-3
Launch Site: Plesetsk, U.S.S.R
Mass: 750 kg

Funding Agency

  • Unknown (U.S.S.R)


  • 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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