Subsynchronous orbit
Kind of planetary orbit
A subsynchronous orbit is an orbit of a satellite that is nearer the planet than it would be if it were in synchronous orbit, i.e. the orbital period is less than the sidereal day of the planet.[1]
Technical considerations
An Earth satellite that is in (a prograde) subsynchronous orbit will appear to drift eastward as seen from the Earth's surface.[1]
Economic importance in commercial spaceflight
The Geosynchronous-belt subsynchronous orbital regime is regularly used in spaceflight. This orbit is typically used to house working communication satellites that have not yet been deactivated, and may be still be used again in geostationary service if the need arises.[2]
See also
- Supersynchronous orbit
- List of orbits
References
- ^ a b Maral, Gérard; Michel Bousquet; Zhili Sun (2009). Satellite communications systems : systems, techniques and technology. Wiley. OCLC 701718866.
- ^ Kumar, Krishna (March 1993). "Geosynchronous satellites at sub-synchronous altitudes". Acta Astronautica. 29 (3): 149–151. Bibcode:1993AcAau..29..149K. doi:10.1016/0094-5765(93)90043-V.
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Gravitational orbits
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Geocentric | |
About other points |
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Orientation | |
Position |
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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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