Inactive
Explorer 1
Explorer 1 carried a cosmic-ray detector built under James Van Allen's team. Its data revealed trapped radiation around Earth, turning an early space-race milestone into a foundational scientific mission.
Technical specifications
CATEGORY
Historic
TYPE
Generic
COUNTRY
United States
OPERATOR
U.S. Army Ballistic Missile Agency / JPL
LAUNCH DATE
Feb 1, 1958
LAUNCH SITE
Cape Canaveral
ORBIT CLASS
LEO
ALTITUDE · KM
199
ORBITAL PERIOD · MIN
88.48
INCLINATION · DEG
33.15
APOGEE · KM
215
PERIGEE · KM
183
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