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- Discoverer_20 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 around 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.".
- Discoverer_20 thumbnail Thor_Agena_B_with_Discoverer_20_(Feb._17,_1961).gif?width=300.
- Discoverer_20 wikiPageID "27803212".
- Discoverer_20 wikiPageRevisionID "588731453".
- Discoverer_20 apsis "gee".
- Discoverer_20 decayDate "1962-07-28".
- Discoverer_20 harvardDesignation "1961".
- Discoverer_20 hasPhotoCollection Discoverer_20.
- Discoverer_20 launchDate "--02-17".
- Discoverer_20 launchRocket "Thor DM-21 Agena-B 298".
- Discoverer_20 launchSite Vandenberg_Air_Force_Base.
- Discoverer_20 launchSite Vandenberg_AFB_Launch_Complex_75.
- Discoverer_20 manufacturer Lockheed_Corporation.
- Discoverer_20 missionType "Optical reconnaissance".
- Discoverer_20 name "Discoverer 20".
- Discoverer_20 operator National_Reconnaissance_Office.
- Discoverer_20 operator United_States_Air_Force.
- Discoverer_20 orbitInclination "80.9".
- Discoverer_20 orbitPeriod "5712.0".
- Discoverer_20 orbitReference Geocentric_orbit.
- Discoverer_20 orbitRegime Low_Earth_orbit.
- Discoverer_20 spacecraftBus RM-81_Agena.
- Discoverer_20 spacecraftType KH-5_Argon.
- Discoverer_20 subject Category:Spacecraft_launched_in_1961.
- Discoverer_20 subject Category:Spacecraft_which_reentered_in_1962.
- Discoverer_20 type ArtificialSatellite.
- Discoverer_20 type Satellite.
- Discoverer_20 type Thing.
- Discoverer_20 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 around 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.".
- Discoverer_20 label "Discoverer 20".
- Discoverer_20 label "Discoverer 20".
- Discoverer_20 sameAs Discoverer_20.
- Discoverer_20 sameAs m.0cc9vdw.
- Discoverer_20 sameAs Q5281803.
- Discoverer_20 sameAs Q5281803.
- Discoverer_20 wasDerivedFrom Discoverer_20?oldid=588731453.
- Discoverer_20 depiction Thor_Agena_B_with_Discoverer_20_(Feb._17,_1961).gif.
- Discoverer_20 isPrimaryTopicOf Discoverer_20.