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Explorer 5
Explorer 5 before launch.
Mission typeEarth science
OperatorArmy Ballistic Missile Agency
Mission durationFailed to orbit
Spacecraft properties
ManufacturerJet Propulsion Laboratory
Launch mass16.86 kilograms (37.2 lb)
Start of mission
Launch dateAugust 24, 1958, 06:17:22 (1958-08-24UTC06:17:22) UTC
RocketJuno I
Launch siteCape Canaveral LC-5
Orbital parameters
Reference systemGeocentric
RegimeMedium Earth
Explorer program

Explorer 5 was a United States satellite with a mass of 17.24 kg. It was the last of the original series of Explorers built, designed, and operated by the Jet Propulsion Laboratory.[1]

It launched atop a Juno I rocket on August 24, 1958 from Launch Complex 5, but failed when the rocket's first stage collided with its second stage after separation, causing the upper stage firing angle to be off.[2]

Explorer 5 had been intended to be one of two satellites used to gather data for Project Argus.


  1. ^ Jet Propulsion Laboratory, "Explorer 5"
  2. ^ "Past Missions - Explorer 1-5". Jet Propulsion Laboratory. Retrieved 2008-02-03.

This page was last edited on 16 January 2021, at 14:59
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