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HEO (highly elliptical / high Earth orbit)

  1. Highly elliptical orbit. Definitions vary, one being an orbit with a perigee (low point) below 3,000 km and an apogee (high point) above 30,000 km.

  2. High Earth orbit. An orbit whose apogee lies above that of a geostationary orbit at 35,800 km.

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