Discoverer 31 (Corona Mission 9024 / KH-3 3 / Topsoc 2), a U.S. NRO/CIA KH-3 film-return photoreconnaissance satellite launched on a Thor DM-21 Agena-B from Vandenberg into polar LEO for panoramic photo reconnaissance with film-capsule recovery.
- Outcome
- Success
- Payload to orbit
- 303 kg (est.)
- Flight
- 16th
- of 40 Thor DM-21 Agena-B flights
- Date and time
- 17 September 1961, 21:00 UTC
- Rocket
- Thor DM-21 Agena-B
- Builder
- McDonnell Douglas
- Launch site
- Space Launch Complex 2E, Vandenberg SFB, CA, USA
- Payload
- Unknown
- International designator
- 1961-026
- Launches in 1961
- 35th of 50
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