High Earth orbit
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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° |
Notes
References
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Vela at Encyclopedia Astronautica
- ↑ Trajectory Details for Vela 1A from the National Space Science Data Center
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Gravitational orbits
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