Observations with the Hubble Space Telescope revealed a planet about 16 AU from a star whose mass is the same as our Sun’s mass. How long does it take the planet to orbit the star?
astronomy - drwls, Monday, March 23, 2009 at 6:38am
Since the star's mass equals that of the sun, you can use the same form of Kepler's third law that applies to our solar system.
P^2 = a^3
In the above formula, P is the period in years and a is the distance from the star in a.u.
for more about the law
P^2 = (16)^3 = 4096
P = 64 years