Calculate the mass of the star using the fact

Question

that the period of the planet is 3.07 × 107
s
and its distance from the star is 1.26×1011 m.
Answer in units of kg

Answer 1

The orbital period is given by

T = 2π√(r^3/GM)

We want M, which is thus

M = r^3/G * (2π/T)^2

Now just plug in your numbers.