Explorer 12 (EPE-A / S-3), a NASA Energetic Particles Explorer for magnetospheric and radiation-belt studies, launched on a Thor DM-19 Delta from Cape Canaveral LC-17A on 16 August 1961 into a highly elliptical Earth orbit. It returned useful data until contact was lost in December 1961.
- Outcome
- Success
- Payload to orbit
- 38 kg
- Flight
- 6th
- of 12 Thor Delta flights
- Date and time
- 16 August 1961, 03:21 UTC
- Rocket
- Thor Delta
- Builder
- McDonnell Douglas
- Launch site
- Space Launch Complex 17A, Cape Canaveral SFS, FL, USA
- Payload
- Unknown
- International designator
- 1961-020
- Launches in 1961
- 28th of 50
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