Please calculate the orbital radius of Los......?

orbital radius r = a m2/(m1+m2) where m1 and m2 are the mes and a the separation. As m_Sol >> m_Jupiter we can write r=a m2/m1 =7.5 x 10^8 km x 2.0 x 10^27 kg/2.0 x 10^30 kg = 7.5 x 10^5 km, which lies just outside the surface of the Sun.