High Earth orbit
To-scale diagram of low, medium and high Earth orbits
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 twenty-four 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.
Example of satellite 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 |
6,519.6 min |
37.8° |
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