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- Discoverer_27 abstract "Discoverer 27, also known as Corona 9020A, was an American area survey optical reconnaissance satellite launched in 1961, but which failed to achieve orbit. It was a KH-5 Argon satellite, based on an Agena-B. It was the fourth KH-5 to be launched, the second consecutive KH-5 launch failure, and the fourth consecutive KH-5 mission failure.The launch of Discoverer 27 occurred at 22:35 UTC on 21 July 1961. A Thor DM-21 Agena-B rocket was used, flying from Launch Complex 75-3-4 at the Vandenberg Air Force Base. The booster began exhibiting abnormal pitch gyrations within seconds of liftoff, which worsened during flight and eventually exceeded its design limits. At T+59 seconds, the Agena disintegrated due to either structural loads or inadvertent activation of the range safety destruct charges. The Thor's engine shut down due to loss of electrical power caused by damage to the forward section of the vehicle. Twenty seconds later, the Thor exploded and all telemetry data ceased, although the telemetry transmitter continued operating until 300 seconds after launch, likely at the point where water impact occurred. Range Safety issued the destruct command at T+94 seconds, but only as a formality and there was no indication that it did anything.The failure was traced to an open circuit in the guidance programmer.Discoverer 27 was designed to operated in a low Earth orbit, and had a mass of 1,150 kilograms (2,540 lb). It 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). The camera would have recorded images onto 127-millimeter (5.0 in) film, which would have been returned in a Satellite Recovery Vehicle, before the satellite ceased operations. The Satellite Recovery Vehicle carried by Discoverer 27 was SRV-524.".
- Discoverer_27 thumbnail Thor_Agena_B_with_Discoverer_27_(Jul._21,_1961).gif?width=300.
- Discoverer_27 wikiPageID "27804331".
- Discoverer_27 wikiPageLength "4102".
- Discoverer_27 wikiPageOutDegree "24".
- Discoverer_27 wikiPageRevisionID "679522720".
- Discoverer_27 wikiPageWikiLink Area_survey.
- Discoverer_27 wikiPageWikiLink Category:Satellite_launch_failures.
- Discoverer_27 wikiPageWikiLink Category:Spacecraft_launched_in_1961.
- Discoverer_27 wikiPageWikiLink Focal_length.
- Discoverer_27 wikiPageWikiLink Frame_camera.
- Discoverer_27 wikiPageWikiLink Geocentric_orbit.
- Discoverer_27 wikiPageWikiLink KH-5_Argon.
- Discoverer_27 wikiPageWikiLink Lockheed_Corporation.
- Discoverer_27 wikiPageWikiLink Low_Earth_orbit.
- Discoverer_27 wikiPageWikiLink National_Reconnaissance_Office.
- Discoverer_27 wikiPageWikiLink RM-81_Agena.
- Discoverer_27 wikiPageWikiLink Reconnaissance_satellite.
- Discoverer_27 wikiPageWikiLink Satellite_Recovery_Vehicle.
- Discoverer_27 wikiPageWikiLink Thor-Agena.
- Discoverer_27 wikiPageWikiLink United_States_Air_Force.
- Discoverer_27 wikiPageWikiLink Vandenberg_AFB_Launch_Complex_75.
- Discoverer_27 wikiPageWikiLink Vandenberg_Air_Force_Base.
- Discoverer_27 wikiPageWikiLink File:Thor_Agena_B_with_Discoverer_27_(Jul._21,_1961).gif.
- Discoverer_27 wikiPageWikiLinkText "Discoverer 27".
- Discoverer_27 apsis "gee".
- Discoverer_27 hasPhotoCollection Discoverer_27.
- Discoverer_27 launchDate "--07-21".
- Discoverer_27 launchRocket "Thor DM-21 Agena-B 322".
- Discoverer_27 launchSite Vandenberg_AFB_Launch_Complex_75.
- Discoverer_27 launchSite Vandenberg_Air_Force_Base.
- Discoverer_27 manufacturer Lockheed_Corporation.
- Discoverer_27 missionDuration "Failed to orbit".
- Discoverer_27 missionType "Optical reconnaissance".
- Discoverer_27 name "Discoverer 27".
- Discoverer_27 operator National_Reconnaissance_Office.
- Discoverer_27 operator United_States_Air_Force.
- Discoverer_27 orbitEpoch "Planned".
- Discoverer_27 orbitReference Geocentric_orbit.
- Discoverer_27 orbitRegime Low_Earth_orbit.
- Discoverer_27 spacecraftBus RM-81_Agena.
- Discoverer_27 spacecraftType KH-5_Argon.
- Discoverer_27 wikiPageUsesTemplate Template:Clear.
- Discoverer_27 wikiPageUsesTemplate Template:Convert.
- Discoverer_27 wikiPageUsesTemplate Template:Discoverer.
- Discoverer_27 wikiPageUsesTemplate Template:Infobox_spaceflight.
- Discoverer_27 wikiPageUsesTemplate Template:Keyhole.
- Discoverer_27 wikiPageUsesTemplate Template:Orbital_launches_in_1961.
- Discoverer_27 wikiPageUsesTemplate Template:Reflist.
- Discoverer_27 wikiPageUsesTemplate Template:US-spacecraft-stub.
- Discoverer_27 subject Category:Satellite_launch_failures.
- Discoverer_27 subject Category:Spacecraft_launched_in_1961.
- Discoverer_27 hypernym Satellite.
- Discoverer_27 type ArtificialSatellite.
- Discoverer_27 type CelestialBody.
- Discoverer_27 type Place.
- Discoverer_27 type Satellite.
- Discoverer_27 type Accident.
- Discoverer_27 type Location.
- Discoverer_27 type Place.
- Discoverer_27 type Thing.
- Discoverer_27 comment "Discoverer 27, also known as Corona 9020A, was an American area survey optical reconnaissance satellite launched in 1961, but which failed to achieve orbit. It was a KH-5 Argon satellite, based on an Agena-B. It was the fourth KH-5 to be launched, the second consecutive KH-5 launch failure, and the fourth consecutive KH-5 mission failure.The launch of Discoverer 27 occurred at 22:35 UTC on 21 July 1961.".
- Discoverer_27 label "Discoverer 27".
- Discoverer_27 sameAs Discoverer_27.
- Discoverer_27 sameAs m.0ccb0dc.
- Discoverer_27 sameAs Q5281809.
- Discoverer_27 sameAs Q5281809.
- Discoverer_27 wasDerivedFrom Discoverer_27?oldid=679522720.
- Discoverer_27 depiction Thor_Agena_B_with_Discoverer_27_(Jul._21,_1961).gif.
- Discoverer_27 isPrimaryTopicOf Discoverer_27.