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.
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Discoverer 13 was an American optical reconnaissance satellite. The lastof five test flights of the Corona KH-1 spy satellite series. It was the first fully successfuly flight of the Discoverer series. It successfuly jetissoned its payload which was recovered in the Ocean by the Navy.
Low Earth OrbitDiscoverer 11 was an American optical reconnaissance satellite. The eighth of ten operational flights of the Corona KH-1 spy satellite series, it successfully employed the first space-worthy camera film; however, Discoverer's film return capsule was lost during reentry on 16 Apr when the satellite's spin motors exploded.
Low Earth OrbitDiscoverer 9 was an American optical reconnaissance satellite, the sixth of ten operational flights of the Corona KH-1 spy satellite series, and the first of them to be equipped with a new, vacuum-proof, polyester-based film. The satellite was not successfully orbited.
Low Earth OrbitDiscoverer II successfully reached orbit and took photos of Earth. However, when the capsule with the data was ejected in order to re-enter the atmosphere there was a timer malfunction meaning it seperated too early and landed over the North Pole rather than the intended target of Hawaii. The capsule was never recovered.
Polar OrbitDiscoverer I was the first of a series of satellites part of the CORONA reconnaissance program. This satellite didn't take a camera or film system as it was intended as a test. There were issues communicating with the satellite during flight with only intermittent signals being read.
Polar Orbit