Transit 2A
Thor DM-21 Ablestar
United States Air Force
Mission
Transit 2A
Type: Navigation
The Transit system was the first satellite navigation system to be used operationally. The system was primarily used by the U.S. Navy to provide accurate location information to its Polaris ballistic missile submarines, and it was also used as a navigation system by the Navy’s surface ships, as well as for hydrographic survey and geodetic surveying.
Trajectory
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Location
Space Launch Complex 17B
Cape Canaveral, FL, USA
887 rockets have launched from Cape Canaveral, FL, USA.

Rocket
Thor DM-21 Ablestar – United States Air Force
- Family: Thor-Ablestar
- Length: 29 m
- Diameter: 1.44 m
- Launch Mass: 51 T
- Low Earth Orbit Capacity: 150 kg
The Thor DM-21 Ablestar was manufactured by United States Air Force with the first launch on 1960-04-13. Thor DM-21 Ablestar has 13 successful launches and 6 failed launches with a total of 19 launches. The Thor-Ablestar, or Thor Able-Star, also known as Thor-Epsilon was an early American expendable launch system consisting of a PGM-17 Thor missile, with an Ablestar upper stage. It was a member of the Thor family of rockets, and was derived from the Thor-Able.
Agency
United States Air Force – USAF
- Type: Government
- Abbreviation: USAF
- Country: USA