  We report on follow-up spectroscopy and photometry of the cataclysmic
variable candidate HS0907+1902 selected from the Hamburg Quasar Survey. B, V,
and R photometry obtained during the first observed outburst of HS0907+1902
(V~13) reveals deep eclipses (DeltaV~2.1-2.8) and an orbital period Porb=4.2h
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~73deg-79deg from the eclipse
duration. The quiescent spectrum obtained with the Hobby-Eberly Telescope shows
double peaked emission lines of HI, HeI and FeI,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 M3+-1.5 and a distance of
d=320+-100pc are derived.
