Home›1958 in the United States›Explorer 4🌐EnglishEnglishBahasa IndonesiaDeutschFrançaisItalianoNederlandsPolskiPortuguêsTiếng ViệtРусский中文日本語EntityQ370053· pop 19· linked from 160 articlesExplorer 4American research satellite launched in 1958Wikidata factsMass25.5Orbital period110.2ImageExplorer4 instruments.pngShow 8 more factsCommons categoryExplorer 4UTC date of spacecraft launch1958-07-26time of object orbit decay1959-10-23semi-major axis of an orbit7616.2orbital eccentricity0.127936orbital inclination50.3apoapsis2213periapsis263Sources (2)Available in 18 languagesFrançaisDeutsch日本語РусскийPortuguêsItalianoBahasa IndonesiaCzechFinnishGalicianHungarianConnectionsNOTS-EV-1 PilotEntityExplorers ProgramEntityCategories1958 in the United StatesExplorers ProgramGeomagnetic satellitesSource attributionSpacecraft launched in 1958Spacecraft which reentered in 1959