Question

A newly discovered planet orbits a distant star with the same mass as the Sun at an average distance of 128 million kilometers. Its orbital eccentricity is 0.3. Find the planet's orbital period in months

Answer 1

The answer for this problem would be:

Orbital period if distance = 128,000,00 km and mass = Sun? 

This is approximately be .85 astronomical units if converted km to au.

We will be using Kepler's third law which is:

T^2 = r^3 

T^2 = .85^3 

T^2 = .61

get the square root of .61
so the answer will be:

T = .78 Years which is in months is 9.36 months.