We present time-resolved spectroscopy of the eclipsing , short period cataclysmic variable CTCV J1300-3052 .
Using absorption features from the secondary star , we determine the radial velocity semi-amplitude of the secondary star to be K _ { 2 } = 378 \pm 6 km s ^ { -1 } , and its projected rotational velocity to be v \sin i = 125 \pm 7 km s ^ { -1 } .
Using these parameters and Monte Carlo techniques , we obtain masses of M _ { 1 } = 0.79 \pm 0.05 M _ { \odot } for the white dwarf primary and M _ { 2 } = 0.198 \pm 0.029 M _ { \odot } for the M-type secondary star .
These parameters are found to be in excellent agreement with previous mass determinations found via photometric fitting techniques , supporting the accuracy and validity of photometric mass determinations in short period CVs .