High Earth orbit

A high Earth orbit is a geocentric orbit with an altitude entirely above that of a geosynchronous orbit (35,786 kilometres (22,236 mi)).[1] The orbital periods of such orbits are greater than 24 hours, therefore satellites in such orbits have an apparent retrograde motion – that is, even if they are in a prograde orbit (90° > inclination ≥ 0°), their orbital velocity is lower than Earth's rotational speed, causing their ground track to move westward on Earth's surface.

To-scale diagram of low, medium and high Earth orbits

Examples of satellites in high Earth orbit

Name NSSDC id. Launch date Perigee Apogee Period Inclination
Vela 1A[2][3] 1963-039A 1963-10-17 101,925 km 116,528 km 6,519 min 37.8°
IBEX 2008-051A 2008-10-19 61,941 km 290,906 km 12,963 min 16.9°
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gollark: Yes there is.
gollark: You can use the `window` API to make it *display* on a subset of the screen, but you also need to translate mouse events.
gollark: It's quite hard to do.
gollark: <@318817623590830080> https://wiki.computercraft.cc/Network_securityI wrote this page (Lignum improved it) on network security in CC, this might be useful to you.

References

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