Define orbital speed of satellite what is its value for a satellite close to earth surface
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In gravitationally bound systems, the orbital speed of an astronomical body or object (e.g. planet, moon, artificial satellite, spacecraft, or star) is the speed at which it orbits around either the barycenter or, if the object is much less massive than the largest body in the system, its speed relative to that largest body. The speed in this latter case may be relative to the surface of the larger body or relative to its center of mass.
The mean orbital velocity needed to maintain a stable low Earth orbit is about 7.8 km/s, (28,080 kph, or 17,448 mph) but reduces with increased orbital altitude. Calculated for circular orbit of 200 km it is 7.79 km/s and for 1500 km it is 7.12 km/s.
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