MLS120126:042313+212951—A New Eclipsing Cataclysmic Variable in the Period Gap

We have analyzed our photometric and spectroscopic observations of the new eclipsing cataclysmic variable MLS120126:042313+212951. We have found the system’s orbital period P=0.1034329 day ( ≈2.48 h) corresponding to the gap 2≲ P≲ 3 h in the distribution of cataclysmic variables. A Doppler tomogram in the H β line demonstrates a bright spot that is formed in the accretion stream–outer accretion disk interaction region. Based on known calibrations of the secondary mass versus period, eclipse duration, and emission line peak separation, we have estimated the orbital inclination and the white-dwarf mass: i=69.5^∘± 2.0^∘ and M_1=0.83± 0.12 M_⊙ . These estimates are consistent with the position of the hot spot on the Doppler tomogram.