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, 
NASA, United States, Dong Fang Hong 2, Energetic Particles Explorer, geomagnetic satellite, 1961, 1960s, 

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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