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SECOR 9 (SEquential COllation of Range) was a joint US Army/Navy satellite launched from Vandenberg AFB aboard a Thor Burner rocket. It was a small geodetic spacecraft used to precisely determine points on the earth. Experiments with these led to Timation, and finally to the GPS Navstar system.

Alternate Names

  • EGRS 9
  • 02861
  • SECOR9

Facts in Brief

Launch Date: 1967-06-29
Launch Vehicle: Thor
Launch Site: Vandenberg AFB, United States
Mass: 20 kg

Funding Agencies

  • Department of Defense-Department of the Navy (United States)
  • Department of Defense-Department of the Army (United States)


  • Navigation/Global Positioning

Additional Information

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

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