Recent content by damaged goods

Hi Andrew, is this the equation that you mean?: r1 = a • m2/m1+m2 = a/1 + m1/m2 where: a is the distance between the centers of the two bodies; m1 and m2 are the masses of the two bodies. r1 is essentially the semi-major axis of the primary's orbit around the barycenter Thanks

I've been working on this for five hours and I am on the verge of despair! Can anybody help with this question? All I need is an equation! There are two extrasolar planets (X and Y) that are orbiting two stars with the same mass as our Sun (1.9891 × 10^30 kg), i.e. the planets are in two...