EPE-A

Explorer 12, also called EPE-A or Energetic Particles Explorer-A and as S3), was a NASA satellite built to measure the solar wind, cosmic rays, and the Earth's magnetic field. It was the first of the S-3 series of spacecraft, which also included Explorer 14, 15, and 26. It was launched on 16 August 1961, aboard a Thor-Delta launch vehicle. It ceased transmitting on 6 December 1961 due to power failure.

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1961  Wikimedia, Wikidata
Energetic Particles Explorer-A; Explorer 12; S-3
mass 37.6 kilogram, 
Energetic Particles Explorer, National Aeronautics and Space Administration, United States, 
Reman, Republic of Haiti, 1961, geomagnetic satellite, Energetic Particles Explorer, Ekran, Dong Fang Hong 2, Tarshish, Sweden, Sikh Confederacy, United States, Persia, Kingdom of Wolaita, Kingdom of Martabam-hongsawatoi, Havilah, Democratic Republic of the Congo, Chinland, Calvinist Republic of Ghent, Ashkenaz, 

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Location: KML, Cluster Map, Maps,

1961-08-16T00:00:00Z

1961-08-16T00:00:00Z

1961 EPE-A

1961-12-06T00:00:00Z

1961-12-06T00:00:00Z

failure

1961-08-16T00:00:00Z

1961-08-16T00:00:00Z

rocket launch

1963-09-30T00:00:00Z

1963-09-30T00:00:00Z

atmospheric entry

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Frameless

Explorer 12 final assembly

Explorer 12 - Orbit

Explorer 12 - Principal elements

Explorer 12 - Artist concept

Explorer 12 - Goddard Space Flight Center

Explorer 12 Aboard Delta 6

Explorer 12

Type	Subtype	Date	Description	Notes	Source
commons	image		Explorer 12 final assembly		Commons
commons	image		Explorer 12 - Orbit		Commons
commons	image		Explorer 12 - Principal elements		Commons
commons	image		Explorer 12 - Artist concept		Commons
commons	image		Explorer 12 - Goddard Space Flight Center		Commons
commons	image		Explorer 12 Aboard Delta 6		Commons
commons	image		Explorer 12		Commons