The Mass of an Extra-solar Planet calculator computes the mass of a planet based on the mass of the star (M), the distance to the star (R) and the distance to the planet (r).
INSTRUCTIONS: Choose the preferred units and enter the following:
Planet Mass (m): The calculator returns the mass of the planet in Jupiter_Mass units (multiples of the mass of Jupiter). However, this can be automatically converted to other mass units (e.g. Earth_Mass or kilograms) via the pull-down menu.
If you know the mass of a star, and the orbital radius of the star and the planet, you can compute the mass of the planet using the fact that the center of mass obeys the relation: m•R = M•r. The formula for the mass of a planet is:
m = (M•r)/ R
Consider Jupiter in our own solar system:
If you enter the above, the calculator returns an exoplanet mass of approximately 1 Jupiter Mass which fits the model and describes our solar system.
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