Spacecraft information: EXPLORER 51
| Launched | 15 December 1973 |
| Flight ended | 11 December 1978 |
| Status | Decayed |
| Launch site | Air Force Western Test Range, California, USA |
| Owner | United States |
| NORAD ID | 6977 |
| COSPAR ID | 1973-101A |
| Alternative names |
AE-C |
| Observing |
Launched alongside
DELTA 1 R/B