Thor DM-21 Ablestar
USA Wikipedia 
Built & Operated By
United States Air Force
Government · founded 1947
Family
Thor
variant DM-21
Maiden Flight
13 APR 1960
About
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.
Vehicle Specifications
Height
29 m
Diameter
1.44 m
Launch Mass
51 T
Thrust
760 kN
Stages
2
Configuration
Expendable
Launch Record
Total Launches
19
Successful
13
Failed
6
Consecutive
5
Performance
To LEO
150 kg