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Explorer 12 (also known as S3) was a United States Satellite built to measure Solar wind, Cosmic ray, and Magnetic field[1]. It was launched on August 16 1961, aboard a Thor-Delta booster[2]. Explorer 11 was the first of the 3 S3 series spacecraft. It ceased transmitting on December 6 due to power failure.

Explorer 12
Mission typeSpace Physics
OperatorNASA
COSPAR ID1961-020A
SATCAT no.170
Website[1]
Mission duration~4 months
Spacecraft properties
ManufacturerGSFC
Launch mass37.6 kilograms (83 lb)
Dry mass37.6 kilograms (83 lb)
PowerSolar
Start of mission
Launch date16 August 1961, 23:21 (1961-08-16UTC23:21Z) UTC
RocketThor-Delta
Launch siteCape Canaveral LC-17B
End of mission
Last contact6 December 1961 (1961-12-07)
Decay date1 September 1963
Orbital parameters
Reference systemGeocentric
RegimeLEO
Eccentricity0.84091
Perigee790 kilometers (490 mi)
Apogee77,620 kilometers (48,230 mi)
Inclination33.4°
Period1587 minutes
← S-55
 

InstrumentsEdit

 
Explorer 12

Explorer 12 was designed to study space physics, and so had a multitude of instruments including a cosmic-ray detector, a particle trapper, and a magnetometer. Good data was recorded for 90% of the mission.

ReferencesEdit