- Geostationary ring
The geostationary ring is a volume segment around the
geostationary orbitdefined by variations in altitude and declination that can occur for uncontrolled objects left in the geostationary orbit.
geostationary orbitis subject to orbit perturbationscaused by anomalies in the gravitational fieldof the Earth, by the gravitational effects of Sunand Moon, and by solar radiationpressure.
A precessional motion of the
orbit planeis caused by the oblatedness of the Earth(), and the gravitational effects of Sunand Moon. This motion has a period of about 53 years. The two parameters describing the direction of the orbit planein space, the right ascensionof the ascending node, and the inclinationare affected by this precession. The maximum inclinationreached during the 53-year cycle is about 15 degrees. Therefore, the definition of the geostationary ring foresees a declination range from -15 degrees to +15 degrees.
On the other hand,
solar radiationpressure induces an eccentricity that leads to a variation of the orbit radius by ± 75 kilometers in some cases.
This leads to the definition of the
geostationary ringas being a segment of space around the geostationary orbitthat ranges from 75 km below GEO to 75 km above GEO and from -15 degrees to 15 degrees declination.
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