<Ul> <Li> The star S2 follows an elliptical orbit with a period of 15.2 years and a pericenter ( closest distance ) of 17 light - hours ( 7013180000000000000 ♠ 1.8 × 10 m or 120 AU ) from the center of the central object . </Li> <Li> From the motion of star S2 , the object 's mass can be estimated as 4.1 million M , or about 7036820000000000000 ♠ 8.2 × 10 kg . </Li> <Li> The radius of the central object must be less than 17 light - hours , because otherwise , S2 would collide with it . In fact , recent observations of the star S14 indicate that the radius is no more than 6.25 light - hours , about the diameter of Uranus ' orbit . </Li> <Li> No known astronomical object other than a black hole can contain 4.1 million M in this volume of space . </Li> </Ul>
<Ul> <Li> The star S2 follows an elliptical orbit with a period of 15.2 years and a pericenter ( closest distance ) of 17 light - hours ( 7013180000000000000 ♠ 1.8 × 10 m or 120 AU ) from the center of the central object . </Li> <Li> From the motion of star S2 , the object 's mass can be estimated as 4.1 million M , or about 7036820000000000000 ♠ 8.2 × 10 kg . </Li> <Li> The radius of the central object must be less than 17 light - hours , because otherwise , S2 would collide with it . In fact , recent observations of the star S14 indicate that the radius is no more than 6.25 light - hours , about the diameter of Uranus ' orbit . </Li> <Li> No known astronomical object other than a black hole can contain 4.1 million M in this volume of space . </Li> </Ul>
how many solar masses is the black hole at the center of the milky way
how many solar masses is the black hole at the center of the milky way
4.1 million
4.1 million