| Designation | 02142 / 66031A |
| Launch date | 8 Apr 1966 |
| Country of origin | United States |
| Mission | Scientific: UV astronomy |
| Perigee/Apogee | 782/793 km |
| Inclination | 35° |
| Period | 100.6 min |
| Launch vehicle | Atlas Agena D |
| Launch site | Cape Canaveral |
| Out of service | 8 Apr 1966 |
| Cause | Power failure |