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Spacecraft information: HCMM
Launch Details
| Launched | 25 April 1978 |
| Flight ended | 21 December 1981 |
| Status | Decayed |
| Launch site | Air Force Western Test Range, California, USA |
| Owner | United States |
| NORAD ID | 10818 |
| COSPAR ID | 1978-041A |
| Observing |
Launched alongside
SCOUT D-1 R/B