This article is about a type of geocentric orbit defined by altitude. For a more common disambiguation of HEO, see
Highly elliptical orbit.
Geocentric orbit with an altitude entirely above that of a geosynchronous orbit
Space of High Earth orbits (HEO), between Medium Earth orbits (MEO) and the orbit of the Moon.
A high Earth orbit is an Earth-centered orbit with altitude at apogee higher than that of the geosynchronous orbit (35,786 km above sea level [1]).