Transit 4A & Injun-1 & Solrad 3Thor DM-21 Ablestar United States Air Force Launch Status Success Thu ยท Jun 29th, 1961 12:23 AM EDT Location Space Launch Complex 17B Cape Canaveral, FL, USA 209 launches have been at this location. Rocket Thor DM-21 Ablestar Length: 29 meters Diameter: 1.44 meters First Launched: April 13, 1960 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. The Thor DM-21 Ablestar rocket has been launched a total of 3 times with 2 successful and 1 failed launches. Agency United States Air Force Type: Government Abbreviation: USAF Administration: Founded: Launchers: Spacecraft: Country: USA View Rocket Launch Schedule