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Spacecraft information: SME
Launch Details
| Launched | 5 October 1981 |
| Flight ended | 4 March 1991 |
| Status | Decayed |
| Launch site | Air Force Western Test Range, California, USA |
| Owner | United States |
| NORAD ID | 12887 |
| COSPAR ID | 1981-100A |
| Observing |