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medium earth orbit
Medium Earth orbit (MEO), sometimes called intermediate circular orbit (ICO), is the region of space around the Earth above low Earth orbit (altitude of ) and below geostationary orbit (altitude of ).〔
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The most common use for satellites in this region is for navigation, communication, and geodetic/space environment science.〔 The most common altitude is approximately ), which yields an orbital period of 12 hours, as used, for example, by the Global Positioning System (GPS).〔
Other satellites in Medium Earth Orbit include Glonass (with an altitude of ) and Galileo (with an altitude of ) constellations.
Communications satellites that cover the North and South Pole are also put in MEO.〔(Satellite Basics: Solution Benefits )〕
The orbital periods of MEO satellites range from about 2 to nearly 24 hours.〔
Telstar 1, an experimental satellite launched in 1962, orbits in MEO.〔(Medium Earth Orbit )〕
The orbit is home to a number of satellites.〔
==See also==
* Atmospheric reentry
* Escape velocity
* Geostationary Earth Orbit (GEO)
* High Earth orbit (HEO)
* Highly Elliptical Orbit (HEO)
* International Space Station
* List of orbits
* Low Earth orbit (LEO)
* Satellite phone
* Specific orbital energy examples
* Suborbital spaceflight
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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