Launches
Launch SuccessfulArmy Ballistic Missile Agency

Explorer 4

Juno-I

This mission has flown

July 26, 1958

Mission overview

An American satellite in order to study the Van Allen radiation belts and the effects of nuclear explosions upon these belts.

Rocket

Juno-I

Mission type

Earth Science

Payload

Explorer 4

Launch complex

Launch Complex 5 · Cape Canaveral SFS, FL, USA

Launch date

July 26, 1958

Launch window

Instantaneous window

Orbit reached

Medium Earth Orbit

Launch trajectory

The launch pad has not been identified. No flight path is shown.

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Mission updates

Live updates from our team at the press site will appear here on launch day.