# mass of extra-solar planet from M, r and R

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mass of extra-solar planet from M, r and R
Variable Instructions Datatype
Mass of star Decimal (kg)
Distance to planet Decimal (m)
Distance to star Decimal (m)
Type
Equation
Category
vCommons
Contents
3 variables
Rating
Copied from
ID
sspickle.mass of extra-solar planet from M, r and R
UUID
95813a92-81c6-11e5-9770-bc764e2038f2

If you know the mass of a star, and the orbital speed of the star and the planet, you can compute the mass of the planet using the fact that the total momentum is zero in the center of mass frame. This formula computes the mass of the planet using the mass of the star, and the two known speeds.
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