Satellite Mean Orbital Radius Calculator

Online calculator to find the orbital radius given the satellite orbit period and planet mass. When a satellite travels in a geosynchronous orbit around the Earth, it needs to travel at a certain orbiting radius and period to maintain this orbit. The satellite mean orbital radius calculator uses the Kepler's third law equation to estimate orbital radius. The law states that the ratio of the squares of the orbital period for 2 planets is equal to the ratio of the cubes of their mean orbit radius.


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The period of a satellite is the time it takes it to make one full orbit around an object. The period of the Earth as it travels around the sun is one year. If you know the satellite’s orbital period and the mass, you can figure out its radius.