EXPLORER 42
| Launched | 11 December 1970 |
| Flight ended | 4 April 1979 |
| Status | Decayed |
| Launch site | San Marco Launch Platform, Indian Ocean (Kenya) |
| Owner | United States |
| NORAD ID | 4797 |
| COSPAR ID | 1970-107A |
| Alternative names |
SAS-1 |
| Observing |
Launched alongside
SCOUT B R/B