Use the orbital velocity law mr=rÃv2g to calculate the mass of the central black hole. give your answer in kilograms.

Sagittarius A * is a bright and very compact astronomical radio source at the ... The proper motion of Sgr A * is approximately - 2.70 mas per year for the right ascension and - 5.6 mas ...

Mass‎: ‎ (4.31 ± 0.38) * 106M☉; (4.1 ± 0.6) * 106; (4.02 ± 0.16) * 106 M☉‎

Distance‎: ‎7,940 ± 420; 7,860±140±40 pc‎

Right ascension‎: ‎17h 45m 40.0409s‎

Declination‎: ‎-29° 0′ 28.118″‎

I love black holes