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EXPLORER 21
Launch Details
| Launched | 3 October 1964 |
| Flight ended | 29 January 1966 |
| Status | Decayed |
| Launch site | Air Force Eastern Test Range, Florida, USA |
| Owner | United States |
| NORAD ID | 889 |
| COSPAR ID | 1964-060A |
| Alternative names |
IMP-2 |
| Observing |