The system is in an overcontact configuration, with the secondary component being significantly more massive (q=2.4). Naturally one would like to have radial velocities to confirm the mass ratio, but two circumstances increase the confidence in the photometrically determined mass ratio—the overcontact configuration combined with a total eclipse. For a total eclipse, the ratio of the stellar radii is strongly determined. Since we also have the constraint that surface potentials are equal, the result is a strong determination of the mass ratio because the ratio of the radii is uniquely determined by the mass ratio.