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HEOS-1 Highly Eccentric Orbit Satellite spacecraft

HEOS-1 was an ESRO-built spacecraft launched by NASA on 5 December 1968 to investigate interplanetary magnetic fields and study solar and cosmic-ray particles outside Earth's magnetosphere. Its experiments included measurements of helium and other solar-wind particles.

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Identity

Aliases
HEOS-1HEOS 1HEOS-AHighly Eccentric Orbit Satellite 1
Family Name
HEOS-1
Full Name
HEOS-1 Highly Eccentric Orbit Satellite spacecraft
Roles
orbiterinterplanetary_probeobservatoryresearch
Status
retired
Type
spacecraft

Details

Description
HEOS-1 was an ESRO-built spacecraft launched by NASA on 5 December 1968 to investigate interplanetary magnetic fields and study solar and cosmic-ray particles outside Earth's magnetosphere. Its experiments included measurements of helium and other solar-wind particles.
First Flight Year
1,968
Last Flight Year
1,975
Operator

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Creation Time
August 13, 2026 at 13:32:46 UTC
Updated Time
August 14, 2026 at 19:26:14 UTC