We report on follow-up spectroscopy and photometry of the cataclysmic variable candidate HS 0907+1902 selected from the Hamburg Quasar Survey . B , V , and R photometry obtained during the first observed outburst of HS 0907+1902 ( V \approx 13 ) reveals deep eclipses ( \Delta V \approx 2.1 - 2.8 ) and an orbital period \mbox { $P _ { orb } $ } = 4.2 h with the eclipse depth decreasing to the red .
The outburst eclipse profiles are symmetric , indicating an axisymmetrical brightness distribution in the accretion disc .
We derive an inclination i \approx 73 ^ { \circ } -79 ^ { \circ } from the eclipse duration .
The quiescent spectrum obtained with the Hobby-Eberly Telescope shows double peaked emission lines of H I , He I and Fe I , II and clearly identifies the system as a dwarf nova .
Absorption features of the secondary star are detected at red wavelengths from which a spectral class M 3 \pm 1.5 and a distance of d = 320 \pm 100 pc are derived .