Discoverer 12 (Corona diagnostic 1), a KH-1 recovery-system test without a camera, launched on a Thor Agena-A from Vandenberg on 29 June 1960. After staging, an Agena horizon-sensor fault pointed the upper stage too low and the vehicle fell into the Pacific without reaching orbit.
- Outcome
- Failure
- Orbit
- LEO
- Low Earth orbit
- Payload to orbit
- Did not reach orbit
- Flight
- 12th
- of 15 Thor Agena A flights
- Date and time
- 29 June 1960, 22:00 UTC
- Rocket
- Thor Agena A
- Builder
- McDonnell Douglas
- Launch site
- Space Launch Complex 1W, Vandenberg SFB, CA, USA
- Payload
- Government/Top Secret
- Launches in 1960
- 15th of 38