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- Explorer_4 abstract "Explorer 4 was a American satellite launched on July 26, 1958. It was instrumented by Dr. James van Allen's group. The Department of Defense's Advanced Research Projects Agency had initially planned two satellites for the purposes of studying the Van Allen radiation belts and the effects of nuclear explosions upon these belts (and the Earth's magnetosphere in general), however Explorer 4 was the only such satellite launched as the other, Explorer 5, suffered launch failure.Explorer 4 was a cylindrically shaped satellite instrumented to make the first detailed measurements of charged particles (protons and electrons) trapped in the terrestrial radiation belts.".
- Explorer_4 thumbnail Explorer4_instruments.png?width=300.
- Explorer_4 wikiPageExternalLink explorer.html.
- Explorer_4 wikiPageID "148439".
- Explorer_4 wikiPageRevisionID "591419680".
- Explorer_4 apsis "gee".
- Explorer_4 decayDate "1959-10-23".
- Explorer_4 harvardDesignation "1958".
- Explorer_4 hasPhotoCollection Explorer_4.
- Explorer_4 imageCaption "Explorer 4".
- Explorer_4 lastContact "1958-10-05".
- Explorer_4 launchDate "--07-26".
- Explorer_4 launchRocket Juno_I.
- Explorer_4 launchSite Cape_Canaveral_Air_Force_Station.
- Explorer_4 launchSite Cape_Canaveral_Air_Force_Station_Launch_Complex_5.
- Explorer_4 manufacturer Jet_Propulsion_Laboratory.
- Explorer_4 missionDuration "6134400.0".
- Explorer_4 missionType Earth_science.
- Explorer_4 name "Explorer 4".
- Explorer_4 operator Army_Ballistic_Missile_Agency.
- Explorer_4 orbitArgPeriapsis "57.72".
- Explorer_4 orbitEccentricity "0.1279360055923462".
- Explorer_4 orbitEpoch "--10-02".
- Explorer_4 orbitInclination "50.29999923706055".
- Explorer_4 orbitMeanAnomaly "303.52".
- Explorer_4 orbitMeanMotion "15.52".
- Explorer_4 orbitPeriod "6612.0".
- Explorer_4 orbitRaan "82.42".
- Explorer_4 orbitReference Geocentric_orbit.
- Explorer_4 orbitRegime Medium_Earth_orbit.
- Explorer_4 orbitRevNumber "6070".
- Explorer_4 satcat "9".
- Explorer_4 subject Category:1958_in_the_United_States.
- Explorer_4 subject Category:Explorer_program.
- Explorer_4 subject Category:Spacecraft_launched_in_1958.
- Explorer_4 subject Category:Spacecraft_which_reentered_in_1959.
- Explorer_4 type ArtificialSatellite.
- Explorer_4 type Satellite.
- Explorer_4 type Thing.
- Explorer_4 comment "Explorer 4 was a American satellite launched on July 26, 1958. It was instrumented by Dr. James van Allen's group.".
- Explorer_4 label "Explorer 4".
- Explorer_4 label "Explorer 4".
- Explorer_4 label "Explorer 4".
- Explorer_4 label "Explorer 4".
- Explorer_4 label "Эксплорер-4".
- Explorer_4 label "エクスプローラー4号".
- Explorer_4 sameAs Explorer_4.
- Explorer_4 sameAs Explorer_4.
- Explorer_4 sameAs Explorer_4.
- Explorer_4 sameAs Explorer_4.
- Explorer_4 sameAs エクスプローラー4号.
- Explorer_4 sameAs Explorer_4.
- Explorer_4 sameAs Explorer_4.
- Explorer_4 sameAs m.0130pl.
- Explorer_4 sameAs Q370053.
- Explorer_4 sameAs Q370053.
- Explorer_4 wasDerivedFrom Explorer_4?oldid=591419680.
- Explorer_4 depiction Explorer4_instruments.png.
- Explorer_4 isPrimaryTopicOf Explorer_4.