Thor SLV-2 Agena B – McDonnell Douglas Family: Thor meters Length: 27.2 meters Diameter: 2.44 meters Launch Mass: 56 Low Earth Orbit Capacity: 400 The Thor SLV-2 Agena B was manufactured by McDonnell Douglas with the first launch on 1964-01-25. Thor SLV-2 Agena B has 0 successful launches and 0 failed launches with a total of 0 launches. Thor-Agena was a series of orbital launch vehicles. The rockets used Thor first stages and Agena second stages. They are thus cousins of the more-famous Thor-Deltas, which founded the Delta rocket family. Manufacturer McDonnell Douglas is a Commercial USA entity that was founded in and is administered by . McDonnell Douglas has 0 successful launches and 0 failed launches with a total of 0 launches.