About: Explorer 4

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An Entity of Type : dbkwik:resource/G7YR4yAvfoe7I_ap4nmguQ==, within Data Space : 134.155.108.49:8890 associated with source dataset(s)

Explorer 4 was an 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.

Attributes	Values
rdf:type	spaceflight
rdfs:label	Explorer 4
rdfs:comment	Explorer 4 was an 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.
sameAs	dbr:Explorer_4
dcterms:subject	dbkwik:resource/JDPs6vJ5quQC10St-QZlBg== dbkwik:resource/WXm9QgyAdDqHpgsGMpWzlQ== dbkwik:resource/K8m5HWcjC6QP6OhKE1NjAQ== dbkwik:resource/sy7kFxCgkwlPaPy49Y5aIQ==
dbkwik:nasa/proper...iPageUsesTemplate	dbkwik:resource/LZJkrcrfaUS_NkKNg9ikcw== dbkwik:resource/mg64NwTYK_Rtbd7q4FYpVA== dbkwik:resource/pqvkHbJ5XvXO9Fh9-H3Vqg== dbkwik:resource/6I6FLi29OyciUet5wlYCrQ== dbkwik:resource/8W3V4a4Z40XHvEsACROc1A== dbkwik:resource/ZXh78N_uED5iGSIv19m7pg== dbkwik:resource/mMzexyXOEYC-AlxW1DsaNw== dbkwik:resource/zuwqhh-Q3rqryxLVp1lCUA==
Harvard designation	1958(xsd:integer)
SATCAT	9(xsd:integer)
Mission Duration	6134400.0
Name	Explorer 4
orbit mean anomaly	303(xsd:double)
orbit RAAN	82(xsd:double)
Image caption	Explorer 4
Manufacturer	Jet Propulsion Laboratory
orbit period	6612.0
orbit mean motion	15(xsd:double)
orbit inclination	50(xsd:double)
Operator	Army Ballistic Missile Agency
decay date	1959-10-23(xsd:date)
launch site	dbkwik:resource/f4p-gh4QMDCzb1PIVsU91A== Cape Canaveral Air Force Station
Mission Type	dbkwik:resource/2_TfaYBh4erEdnnp5ZpzQg==
apsis	gee
orbit regime	Medium Earth orbit
launch rocket	dbkwik:resource/5xJpxsxsnJLIfrsl4ZcLGg==
Launch date	--07-26
last contact	1958-10-05(xsd:date)
orbit arg periapsis	57(xsd:double)
orbit rev number	6070(xsd:integer)
orbit epoch	--10-02
orbit reference	Geocentric orbit
orbit eccentricity	0(xsd:double)
abstract	Explorer 4 was an 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.

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