Thor Agena A – McDonnell Douglas Family: Thor meters Length: 28 meters Diameter: 2.44 meters Launch Mass: 53 Low Earth Orbit Capacity: 250 The Thor Agena A was manufactured by McDonnell Douglas with the first launch on 1959-01-21. Thor Agena A 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.