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Discoverer 28



Discoverer 28 was a low resolution, photo surveillance satellite launched by the US Air Force from Vandenberg AFB aboard a Thor Agena-A rocket. This KH-2 (KeyHole-2) mission failed when the second stage control system malfunctioned.

Alternate Names

  • KH-2 9021

Facts in Brief

Launch Date: 1961-08-03
Launch Vehicle: Thor-Agena
Launch Site: Vandenberg AFB, United States
Mass: 1150.0 kg

Funding Agency

  • Department of Defense-Department of the Air Force (United States)


  • Astronomy
  • Earth Science
  • Surveillance and Other Military

Additional Information

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

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