Thor Delta C | 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.
Mission Details
- Launch date: October 4, 1964 at 03:45 AM UTC
- Launch vehicle: Thor Delta C
- Operator: United States Air Force
- Launch site: Cape Canaveral SFS, FL, USA
- Mission type: Astrophysics