The orbital radius can be found by rearranging the orbital velocity formula. In gravitationally bound systems the orbital speed of an astronomical body or object eg. The orbital velocity can be found using the formula.
Under standard assumptions the orbital speed of a body traveling along an elliptic orbit can be computed from the vis-viva equation as.
6 7 3 1 0 1 1 N m 2 k g 2. Use the orbital velocity equation where m is the mass of the orbited body here Earth and r is the distance the orbiting object the satellite is separated from the center of the body its orbiting. 638 times 106 m 638 106m. Thanks to physics if you know the mass and altitude of a satellite in orbit around the Earth you can calculate how quickly it needs to travel to maintain that orbit.