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- Q5281803 subject Q8784928.
- Q5281803 subject Q9731947.
- Q5281803 abstract "Discoverer 20, also known as Corona 9014A, was an American area survey optical reconnaissance satellite which was launched in 1961. It was a KH-5 Argon satellite, based on an Agena-B. Discoverer 20 was the first KH-5 to be launched, however it failed towards the end of its mission, when its film return capsule failed to separate from the main spacecraft.The launch of Discoverer 20 occurred at 20:25 UTC on 17 February 1961. A Thor DM-21 Agena-B rocket was used, flying from Launch Complex 75-3-4 at the Vandenberg Air Force Base. Upon successfully reaching orbit, it was assigned the Harvard designation 1961 Epsilon 1.Discoverer 20 was operated in a low Earth orbit, with a perigee of 283 kilometres (176 mi), an apogee of 770 kilometres (480 mi), 80.9 degrees of inclination, and a period of 95.2 minutes. The satellite had a mass of 1,110 kilograms (2,450 lb), and was equipped with a frame camera with a focal length of 76 millimetres (3.0 in), which had a maximum resolution of 140 metres (460 ft). Images were recorded onto 127-millimeter (5.0 in) film, and were to have been returned in an SRV before the satellite ceased operations. Due to a problem with the systems controlling the flight program, the spacecraft failed to eject its film capsule, and hence no images were returned. Discoverer 20 decayed from orbit on 28 July 1962.".
- Q5281803 thumbnail Thor_Agena_B_with_Discoverer_20_(Feb._17,_1961).gif?width=300.
- Q5281803 wikiPageWikiLink Q1093603.
- Q5281803 wikiPageWikiLink Q11223.
- Q5281803 wikiPageWikiLink Q1579577.
- Q5281803 wikiPageWikiLink Q16862.
- Q5281803 wikiPageWikiLink Q193540.
- Q5281803 wikiPageWikiLink Q2351078.
- Q5281803 wikiPageWikiLink Q30.
- Q5281803 wikiPageWikiLink Q37640.
- Q5281803 wikiPageWikiLink Q4112212.
- Q5281803 wikiPageWikiLink Q427818.
- Q5281803 wikiPageWikiLink Q461492.
- Q5281803 wikiPageWikiLink Q466421.
- Q5281803 wikiPageWikiLink Q663611.
- Q5281803 wikiPageWikiLink Q7233.
- Q5281803 wikiPageWikiLink Q83481.
- Q5281803 wikiPageWikiLink Q8784928.
- Q5281803 wikiPageWikiLink Q9731947.
- Q5281803 type Place.
- Q5281803 type ArtificialSatellite.
- Q5281803 type CelestialBody.
- Q5281803 type Location.
- Q5281803 type Place.
- Q5281803 type Satellite.
- Q5281803 type Thing.
- Q5281803 comment "Discoverer 20, also known as Corona 9014A, was an American area survey optical reconnaissance satellite which was launched in 1961. It was a KH-5 Argon satellite, based on an Agena-B. Discoverer 20 was the first KH-5 to be launched, however it failed towards the end of its mission, when its film return capsule failed to separate from the main spacecraft.The launch of Discoverer 20 occurred at 20:25 UTC on 17 February 1961.".
- Q5281803 label "Discoverer 20".
- Q5281803 depiction Thor_Agena_B_with_Discoverer_20_(Feb._17,_1961).gif.