Question

An asteroid has a mean radius of orbit of 4.8 x 10^11 m. What is its orbital period
around the sun

Answer 1

use Kepler's law for orbital periods:\[T^2 = a^3\]where T is the orbital period, in years, and a is the distance, measure in AU's, the average distance of the earth to the sun. See this for more
http://hyperphysics.phy-astr.gsu.edu/hbase/kepler.html#c6