Keplers law (1 Viewer)

[Premus]

in the formula....

T^2 / R ^3 = 4pi^ / GM

is R, the ORIBITAL radius? or just the radius of the planet??

 

[Xayma]

Orbital Radius. So centre of mass to centre of mass.

 

[helper]

Centre of rotation to centre of mass. In satellites the centre of rotation is normally the centre of the planet so simplifies to what xayma said.