Find the mass of Saturn in solar masses from the semimajor axis and period of the orbit of its moon Enceladus: a = 2.38 x 105 km and P = 1.37 days, with 1.5 x 108 km = 1 AU and 365 days = 1 yrs.
a) Convert a and P into units of AU and yrs, respectively.
b) Use a3/P2 = MSat to calculate Saturn's mass in units of solar masses.