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GREB 5 (or GRAB 5) was a joint US Army-US Navy venture launched from the WSMC along with SOLRAD 7A, Secor 1, and gSSE 1.

The GREB program was classified at the time, the primary purpose was to receive signals from Soviet radar installations to learn about their air defense posture. The data were used by the U.S. Strategic Air Command. As a cover story, the satellites were equipped with instruments to measure solar radiation. Sometimes referred to as Galactic Radiation and Background (GRAB) satellites, or as part of the SOLar RADiation (SOLRAD) program, they were publicized as scientific missions, and did in fact return scientific data.

Alternate Names

  • 00731
  • GRAB 5
  • GREB 5

Facts in Brief

Launch Date: 1964-01-11
Launch Vehicle: Thor Augmented Delta-Agena D
Launch Site: Vandenberg AFB, United States

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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