Semi-synchronous orbit
A semi-synchronous orbit is an orbit with a period equal to half the average rotational period of the body being orbited, and in the same direction as that body's rotation.
For Earth, a semi-synchronous orbit is considered a medium Earth orbit, with a period of just under 12 hours. For circular Earth orbits, the altitude is approximately 20,200 kilometres (12,600 mi).[1][2]
Semi-synchronous orbits are typical for GPS satellites.
See also
- Molniya orbit
- List of orbits
- Synchronous orbit
References
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Gravitational orbits
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Geocentric | |
About other points |
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Orientation | |
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Variation |
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mechanics
- Astronomical coordinate systems
- Characteristic energy
- Escape velocity
- Ephemeris
- Equatorial coordinate system
- Ground track
- Hill sphere
- Interplanetary Transport Network
- Kepler's laws of planetary motion
- Lagrangian point
- n-body problem
- Orbit equation
- Orbital state vectors
- Perturbation
- Retrograde and prograde motion
- Specific orbital energy
- Specific angular momentum
- Two-line elements
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