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Calsphere 4



Calsphere 4 was a US Air Force radar calibration sphere launched from Vandenberg AFB aboard a Thor Burner rocket along with a DMSP satellite and Calsphere 3 and 5.

Alternate Names

  • 04958
  • Calsphere4

Facts in Brief

Launch Date: 1971-02-17
Launch Vehicle: Thor-Burner II
Launch Site: Vandenberg AFB, United States
Mass: 1 kg

Funding Agency

  • Department of Defense-Department of the Air Force (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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