Conceptual Idea: “According to Newton, Kepler's 3rd Law (P2 = D3) should be modified to read M+m = D3/P2 where M+m is mass in units of Sun+Earth mass, D is the orbital semi-major axis in astronomical units (AU), and P the time for one orbital revolution in Earth years." If one were trying to measure the mass of the Sun, MS, by observing a planet of mass mP orbiting the Sun, why could this equation be used to get a good estimate of MS? If one were trying to measure the mass of Jupiter, MJ, by observing the moon Ganymede of mass mG orbiting Jupiter, why could this equation be used to get a good estimate of MJ?

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