Transit 4B & TRAACThor DM-21 AblestarUnited States Air Force Launch Status Success Wed ยท Nov 15th, 1961 5:26 PM EST LocationSpace Launch Complex 17BCape Canaveral, FL, USA214 rockets have launched from Cape Canaveral, FL, USA. RocketThor DM-21 AblestarLength: 29 meters Diameter: 1.44 meters First Launch: April 13, 1960The 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. AgencyUnited States Air ForceType: Government Abbreviation: USAFCountry: USA View Rocket Launch Schedule