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- Discoverer_21 abstract "Discoverer 21, also known as RM-2, was an American satellite which was launched in 1961. It was a technology demonstration spacecraft, based on an Agena-B.The launch of Discoverer 21 occurred at 22:58 UTC on 18 February 1961. A Thor DM-21 Agena-B rocket was used, flying from Launch Complex 75-3-5 at the Vandenberg Air Force Base. Upon successfully reaching orbit, it was assigned the Harvard designation 1961 Zeta 1.Discoverer 21 was operated in a low Earth orbit, with a perigee of 243 kilometres (151 mi), an apogee of 1,026 kilometres (638 mi), 80.7 degrees of inclination, and a period of 97.4 minutes. The satellite had a mass of 1,110 kilograms (2,450 lb), and was used to demonstrate an engine restart, and to test infrared sensors for the Midas programme. It remained in orbit until 20 April 1962, when it decayed and reentered the atmosphere.".
- Discoverer_21 thumbnail Thor_Agena_B_with_Discoverer_21_(Feb._18,_1961).gif?width=300.
- Discoverer_21 wikiPageID "27898149".
- Discoverer_21 wikiPageLength "3614".
- Discoverer_21 wikiPageOutDegree "27".
- Discoverer_21 wikiPageRevisionID "650019471".
- Discoverer_21 wikiPageWikiLink Apsis.
- Discoverer_21 wikiPageWikiLink Atmospheric_entry.
- Discoverer_21 wikiPageWikiLink Category:Spacecraft_launched_in_1961.
- Discoverer_21 wikiPageWikiLink Category:Spacecraft_which_reentered_in_1962.
- Discoverer_21 wikiPageWikiLink DARPA.
- Discoverer_21 wikiPageWikiLink Geocentric_orbit.
- Discoverer_21 wikiPageWikiLink Harvard_designation.
- Discoverer_21 wikiPageWikiLink Lockheed_Corporation.
- Discoverer_21 wikiPageWikiLink Low_Earth_orbit.
- Discoverer_21 wikiPageWikiLink Missile_Defense_Alarm_System.
- Discoverer_21 wikiPageWikiLink Orbital_decay.
- Discoverer_21 wikiPageWikiLink Orbital_inclination.
- Discoverer_21 wikiPageWikiLink Orbital_period.
- Discoverer_21 wikiPageWikiLink RM-81_Agena.
- Discoverer_21 wikiPageWikiLink Satellite.
- Discoverer_21 wikiPageWikiLink Thor-Agena.
- Discoverer_21 wikiPageWikiLink United_States.
- Discoverer_21 wikiPageWikiLink United_States_Air_Force.
- Discoverer_21 wikiPageWikiLink Vandenberg_AFB_Launch_Complex_75.
- Discoverer_21 wikiPageWikiLink Vandenberg_Air_Force_Base.
- Discoverer_21 wikiPageWikiLink File:Thor_Agena_B_with_Discoverer_21_(Feb._18,_1961).gif.
- Discoverer_21 wikiPageWikiLinkText "Discoverer 21".
- Discoverer_21 apsis "gee".
- Discoverer_21 decayDate "1962-04-20".
- Discoverer_21 harvardDesignation "1961".
- Discoverer_21 launchDate "--02-18".
- Discoverer_21 launchRocket "Thor DM-21 Agena-B 261".
- Discoverer_21 launchSite Vandenberg_AFB_Launch_Complex_75.
- Discoverer_21 launchSite Vandenberg_Air_Force_Base.
- Discoverer_21 manufacturer Lockheed_Corporation.
- Discoverer_21 missionType "Technology".
- Discoverer_21 name "Discoverer 21".
- Discoverer_21 operator DARPA.
- Discoverer_21 operator United_States_Air_Force.
- Discoverer_21 orbitInclination "80.7".
- Discoverer_21 orbitPeriod "5844.0".
- Discoverer_21 orbitReference Geocentric_orbit.
- Discoverer_21 orbitRegime Low_Earth_orbit.
- Discoverer_21 spacecraftBus RM-81_Agena.
- Discoverer_21 wikiPageUsesTemplate Template:Clear.
- Discoverer_21 wikiPageUsesTemplate Template:Convert.
- Discoverer_21 wikiPageUsesTemplate Template:Discoverer.
- Discoverer_21 wikiPageUsesTemplate Template:End-date.
- Discoverer_21 wikiPageUsesTemplate Template:Infobox_spaceflight.
- Discoverer_21 wikiPageUsesTemplate Template:Orbital_launches_in_1961.
- Discoverer_21 wikiPageUsesTemplate Template:Reflist.
- Discoverer_21 wikiPageUsesTemplate Template:Start-date.
- Discoverer_21 wikiPageUsesTemplate Template:US-spacecraft-stub.
- Discoverer_21 subject Category:Spacecraft_launched_in_1961.
- Discoverer_21 subject Category:Spacecraft_which_reentered_in_1962.
- Discoverer_21 hypernym Satellite.
- Discoverer_21 type ArtificialSatellite.
- Discoverer_21 type CelestialBody.
- Discoverer_21 type Place.
- Discoverer_21 type Satellite.
- Discoverer_21 type Location.
- Discoverer_21 type Place.
- Discoverer_21 type Thing.
- Discoverer_21 comment "Discoverer 21, also known as RM-2, was an American satellite which was launched in 1961. It was a technology demonstration spacecraft, based on an Agena-B.The launch of Discoverer 21 occurred at 22:58 UTC on 18 February 1961. A Thor DM-21 Agena-B rocket was used, flying from Launch Complex 75-3-5 at the Vandenberg Air Force Base.".
- Discoverer_21 label "Discoverer 21".
- Discoverer_21 sameAs Q5281804.
- Discoverer_21 sameAs Discoverer_21.
- Discoverer_21 sameAs Discoverer_21.
- Discoverer_21 sameAs m.0ch34ml.
- Discoverer_21 sameAs Q5281804.
- Discoverer_21 wasDerivedFrom Discoverer_21?oldid=650019471.
- Discoverer_21 depiction Thor_Agena_B_with_Discoverer_21_(Feb._18,_1961).gif.
- Discoverer_21 isPrimaryTopicOf Discoverer_21.