EXPLORER 45
| Launched | 14 November 1971 |
| Flight ended | 9 January 1992 |
| Status | Decayed |
| Launch site | San Marco Launch Platform, Indian Ocean (Kenya) |
| Owner | United States |
| NORAD ID | 5598 |
| COSPAR ID | 1971-096A |
| Alternative names |
SSS-A |
| Observing |
Launched alongside
SCOUT B R/B