Sagittarius A*, exists at the centre of the Milky Way Galaxy. Sagittarius A*, the black hole at the centre of the Milky Way Galaxy, taken with NASA's Chandra X-Ray Observatory. Your opinions are important to us. This is the so-called "frame dragging effect," a small and hard-to-measure phenomenon (which, however, been confirmed). At the center of the our galaxy there's a supermassive black hole called Sagittarius A*. Parsa/L. More mysterious are the giant bla… The spin of the black hole, however, has not been determined in any consistent fashion, but its value would help constrain models of possible jet activity. To calculate the mass of the black hole Mol, use the fact that the star SO-2 orbits Sagittarius A' with an orbital period of P = 4.59x109 seconds and a semi-major axis of a = 1.38x10!4 meters. Click here to sign in with Infrared observations of stars orbiting the position of Sagittarius A* demonstrate the presence of a black hole with a mass…. Supermassive Black Hole Sagittarius A*. The black hole is 53.49 million light-years away from Earth. The Galactic centre of the Milky Way is dominated by one resident, the supermassive black hole known as Sagittarius A* (Sgr A*). Sagittarius A* (Supermassive Black Hole) Source 2 (B-class Star) Notes. The spin is quantified by a number between zero and one, and black hole spins have been measured with results ranging from a few tenths to close to the one. A black hole with the mass of a car would have a diameter of about 10 −24 m and take a nanosecond to evaporate, during which time it would briefly have a luminosity of more than 200 times that of the Sun. Cosmic radio-wave source Sagittarius A*, in an image from the Chandra X-ray Observatory. The spins of black holes are difficult to determine; typically they are determined by interpreting the X-ray emission from the hot inner edge of the accretion disk around the black hole. 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