|Mission type||Optical reconnaissance|
|Operator||US Air Force/NRO|
|Mission duration||Failed to orbit|
|Spacecraft type||Corona KH-2|
|Launch mass||1,150 kilograms (2,540 lb)|
|Start of mission|
|Launch date||23 October 1961, 19:23UTC|
|Rocket||Thor DM-21 Agena-B 329|
|Launch site||Vandenberg LC-75-3-5|
Discoverer 33, also known as Corona 9026, was an American optical reconnaissance satellite which was lost in a launch failure in 1961. It was the eighth of ten Corona KH-2 satellites, based on the Agena-B.
The launch of Discoverer 33 occurred at 19:23 UTC on 23 October 1961. A Thor DM-21 Agena-B rocket was used, flying from Launch Complex 75-3-5 at the Vandenberg Air Force Base. The launch ended in failure after the Agena suffered a hydraulics system malfunction that led to premature main engine shutdown.
Discoverer 33 was intended to have operated in a low Earth orbit. It had a mass of 1,150 kilograms (2,540 lb), and was equipped with a panoramic camera with a focal length of 61 centimetres (24 in), which had a maximum resolution of 7.6 metres (25 ft). It would have recorded images onto 70-millimeter (2.8 in) film, and returned this in a Satellite Recovery Vehicle at the end of its mission. The Satellite Recovery Vehicle carried by Discoverer 33 was SRV-553.