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kurious
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How accurate does the orbiting velocity of a geostationary satellite have to be so that it keeps in synch with the same geographical part of the Earth over a period of ten years.
kurious said:How accurate does the orbiting velocity of a geostationary satellite have to be so that it keeps in synch with the same geographical part of the Earth over a period of ten years.
I haven't learned much yet about perturbations due to deviations of an extended mass from spherical symmetry. Are the perturbations modeled as though the mass distribution of a rotating planet were the integration of cylinders: rod connecting the poles, disk at the equator, and intermediate cylinders in between? That would explain why zonal harmonics are the only spherical harmonics used in the series expansion for the gravitational potential.marlon said:ah, start calculation, kurious. Just apply perturbationtheory on the sattelite's orbit. The Earth is not sferical so the potential has to be changed. The formula in function of Legendre functions can be found in any site of astronomy. You can make the following approximatiob though : the inclination of the Earth's orbit and the sattelite's orbit is constant with respect to the ecliptica
greets
marlon.
Jenab said:I haven't learned much yet about perturbations due to deviations of an extended mass from spherical symmetry. Are the perturbations modeled as though the mass distribution of a rotating planet were the integration of cylinders: rod connecting the poles, disk at the equator, and intermediate cylinders in between? That would explain why zonal harmonics are the only spherical harmonics used in the series expansion for the gravitational potential.
Jerry Abbott
Jenab said:I haven't learned much yet about perturbations due to deviations of an extended mass from spherical symmetry. Are the perturbations modeled as though the mass distribution of a rotating planet were the integration of cylinders: rod connecting the poles, disk at the equator, and intermediate cylinders in between? That would explain why zonal harmonics are the only spherical harmonics used in the series expansion for the gravitational potential.
Jerry Abbott
That would explain why zonal harmonics are the only spherical harmonics used in the series expansion for the gravitational potential.
tony873004 said:I've heard that geosync satellites that lose their ability to correct their orbits tend to gather over the Indian Ocean. I guess that's the 180 from the U.S.A. that Enigma was talking about. I've never heard of another node over the U.S, though. That would be useful
Not sure if my source is right though
A geostationary satellite is a type of satellite that orbits the Earth at the same speed and direction as the Earth's rotation, making it appear stationary from a fixed point on the Earth's surface.
Geostationary satellites have a special orbit that allows them to maintain a fixed position relative to the Earth's surface, whereas other satellites have varying orbits that may not always cover the same area.
Geostationary satellites are primarily used for communication purposes, such as satellite television and internet, as well as weather monitoring and navigation systems.
Geostationary satellites are typically launched into space using rockets, and are then maneuvered into their designated orbit using onboard propulsion systems.
The lifespan of a geostationary satellite varies, but on average they can last anywhere from 10-15 years before needing to be replaced with a new satellite.