We present high-speed , three-colour photometry of the faint eclipsing cataclysmic variable OU Vir .
For the first time in OU Vir , separate eclipses of the white dwarf and bright spot have been observed .
We use timings of these eclipses to derive a purely photometric model of the system , obtaining a mass ratio of q = 0.175 \pm 0.025 , an inclination of i = 79 \aas@@fstack { \circ } 2 \pm 0 \aas@@fstack { \circ } 7 and a disc radius of R _ { d } / a = 0.2315 \pm 0.0150 .
We separate the white dwarf eclipse from the lightcurve and , by fitting a blackbody spectrum to its flux in each passband , obtain a white dwarf temperature of T = 13900 \pm 600 K and a distance of D = 51 \pm 17 pc .
Assuming that the primary obeys the ( ) mass-radius relation for white dwarfs and allowing for temperature effects , we also find a primary mass M _ { w } / M _ { \sun } = 0.89 \pm 0.20 , primary radius R _ { w } / R _ { \sun } = 0.0097 \pm 0.0031 and orbital separation a / R _ { \sun } = 0.74 \pm 0.05 .