What does HEEO stand for?

Highly Elliptical Earth Orbit

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

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Samples in periodicals archive:

A solid rocket motor, provided by Alliant Techsystems (NYSE:ATK), is used to boost IBEX into its highly elliptical Earth orbit, with an apogee of approximately 150,000 miles (or nearly two-thirds of the distance to the Moon).

Orbital's IBEX Satellite Selected by NASA for Newest Small Explorer ...

From a highly elliptical Earth orbit that extends out more than one third the distance to the Moon, Chandra will be able to detect X-ray sources billions of light years away, revealing celestial phenomena not visible to the human eye or conventional optical telescopes.

TRW Completes, Rolls Out NASA's Newest X-Ray Observatory

From its highly elliptical Earth orbit, AXAF will observe and study X-rays, an invisible form of energy that comes from the deepest reaches of the universe.

Key AXAF Mirror Assembly Delivered to TRW; Kodak Set to Begin ...