ARMY BALLISTIC MISSILE AGENCY
Juno-I | Explorer 4
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Jul 26, 1958 at 15:00 UTC
▸ Flight profile›
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MISSION OVERVIEW
An American satellite in order to study the Van Allen radiation belts and the effects of nuclear explosions upon these belts.
LAUNCH DETAILS
VEHICLE
Juno-IMISSION
Explorer 4
MISSION TYPE
Earth Science
TARGET ORBIT
Medium Earth Orbit
LAUNCH PAD
Launch Complex 5LAUNCH SITE
Cape Canaveral SFS, FL, USACOUNTRY
USA
LAUNCH TIME VERIFICATION
CONFIRMEDPrecision: Minute
LAUNCH LIBRARY 2 PRIMARY
API ID: e0975cef-e8c6-4f35-bbf7-1b55963e06a5
Reported date: Jul 26, 1958 at 15:00 UTC
Last synced: 4 minutes ago
This launch date and time are confirmed by the launch provider. Countdown is active.
LAUNCH MAP
PAD WEATHER
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DEEP SPACE PROBE →
Juno
Jupiter
NASA / JPLOPERATOR
OrbiterTYPE
5.2735 AUFROM SUN
EXTENDED MISSION
VEHICLE — Juno-I →
MANUFACTURER
Chrysler
VARIANT
Juno I
FLIGHTS
6
SUCCESSES
3
SUCCESS RATE
50%
The Juno I was a four-stage American booster rocket which launched America's first satellite, Explorer 1 in 1958. A member of thr redstone family, it was derived from the Jupiter-C sounding rocket.
FREQUENTLY ASKED QUESTIONS
When is the Juno-I | Explorer 4 launch?
The Juno-I | Explorer 4 is scheduled for Saturday, July 26, 1958 at 3:00 PM UTC. This is the NET (No Earlier Than) time and may be subject to change. Current status: SUCCESS.
What rocket is being used for Explorer 4?
The Juno-I | Explorer 4 mission uses the Juno-I rocket, manufactured by Chrysler. The Juno-I has flown 6 times with a 50% success rate.
Where is the Juno-I | Explorer 4 launching from?
The launch takes place from Launch Complex 5 at Cape Canaveral SFS, FL, USA.
What orbit is Explorer 4 going to?
The Explorer 4 mission is targeting Medium Earth Orbit.
Who is launching Explorer 4?
The Juno-I | Explorer 4 is operated by Army Ballistic Missile Agency.
Can I watch the Juno-I | Explorer 4 launch live?
Yes. Visit the launch detail page on Space Launch Live for embedded YouTube webcasts, replay videos, and links to live coverage from SpaceX, NASA, NASASpaceflight, and other channels.
LAUNCH TIMELINE
Mar 28, 2026 20:12 UTC
Launch added to tracker
Imported from Launch Library 2 API
Mar 28, 2026 20:12 UTC
Launch date set: Jul 26, 1958 at 15:00 UTC
NET (No Earlier Than) confirmed by Army Ballistic Missile Agency
Mar 28, 2026 20:12 UTC
Launch completed successfully
Updated via Launch Library 2
LIVE DATA SOURCES
Last data sync: 4 minutes ago
●Launch Library 24 minutes ago
Launch ID: e0975cef-e8c6-4f35-bbf7-1b55963e06a5
●Open-Meteo Weather2 days ago
Pad weather at 28.44, -80.57
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Mission Profile
Explorer 4 was a Juno-I Juno I mission operated by Army Ballistic Missile Agency that lifted off from Launch Complex 5, Cape Canaveral SFS, FL, USA on July 26, 1958. The flight carried its payload on a earth science mission to Medium Earth Orbit. The launch was a success.