An exoplanet around a distant star has a circular orbit of radius 1.018$1\mathrm{.}018$ AU and speed 31.1$31\mathrm{.}1$ km/$/$s.$.$ What is the mass of the star in solar masses? The Sun's mass is 1.98847$1\mathrm{.}98847$x10^30$1030$ kg.$.$

Note: the problem is not asking for the mass in kg,$,$ but as a number such that if multiplied by the Sun's mass would give you the mass of the star in kg.$.$