The black hole at the center of our Milky Way galaxy is calculated to have a mass of approximately 4.1 million solar masses (or about 8.2 × 1036 kg) and a radius no more than 6.25 light-hours (about the diameter of Uranus' orbit). This SMBH is located is 26000 light-years from our Solar System. The closest star S2 follows an elliptical orbit with a period of 15.2 years and a pericenter (closest distance) of 17 light hours (1.8×1013 m).
