Actually, 2 x 10e30 kg is about the mass of the Sun (1.989 × 10^30 kg according to Google). It makes this star class G3, not G8 actually.
Diameter is 10 times more than that of the Sun, 1.85 × 10^7 = 18.5 million km. The Sun is 1.39 million km in diameter. This seems to be too big indeed.
