Image: NASA
Thor Delta C | Explorer 21
United States Air Force · Thor Delta C · Space Launch Complex 17A, Cape Canaveral SFS, FL, USA
United States Air Force's 214th launch · 39th this year · humanity's 363rd orbital launch attempt
October 4, 1964Add to calendar
Success
The launch vehicle successfully inserted its payload(s) into the target orbit(s).
Window: Oct 4, 03:45 – Oct 4, 03:45 UTC
Flight preview
Explorer 21
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.
Astrophysics · Elliptical Orbit (Elliptical)
Booster
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