A

David

Darling

HEO (highly elliptical / high Earth orbit)

HEO may stand for 'Highly elliptical orbit'. Definitions of this vary, one being an orbit with a perigee (low point) below 3,000 kilometers and an apogee (high point) above 30,000 kilometers.

 

HEO may also stand for 'High Earth orbit' – an orbit whose apogee lies above that of a geostationary orbit at 35,800 kilometers.