Hi, I am not too sure where to post this. I am studying for my astrophysics final and I came across this question which is pretty easy ( I think) but I can't seem to find the answer... S2 is observed to be one of the brightest stars orbiting the black hole at the center of Milky Way. It has period of 15 years and orbit of 950 A.U. a) Find the mass of the super-massive black hole b)find its event horizon. I can do b ( can't find the schwarzchild radius without the mass though). For a, I thought of using the relationship of T^2=a^3 to find my semi major axis to then find my mass with M=A^3/P however that didn't work. I'm not too sure what to use anymore.