Explorer 21 Mission
Launch Status
Success
Date & Time
4 Oct 1964, 3:45am
UTC
Pad
Space Launch Complex 17A
Launch Service Provider
Vehicle
Mission
Explorer 21
Mission Type
Astrophysics
Destination
Elliptical Orbit
Explorer 21 (IMP 2) was a solar-cell and chemical-battery powered spacecraft instrumented for interplanetary and distant magnetospheric studies of energetic particles, cosmic rays, magnetic fields, and plasmas.
Updated: Jan 3, 7:54pm UTC
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