Thor Delta C | Explorer 21
Launch Successful
L - -- : -- : -- : --
Instantaneous launch window.
Launch Window
Oct. 4, 1964, 3:45 a.m. - Oct. 4, 1964, 3:45 a.m.
Instantaneous launch window.
Oct. 4, 1964, 3:45 a.m. - Oct. 4, 1964, 3:45 a.m.
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.
American orbital launch vehicle family with Thor first stage and a delta second stage.
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