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We report the observation of a new dwarf nova, OT J055717+683226, during itsfirst-ever recorded superoutburst in December 2006. Our observation shows thatthis object is an SU UMa-type dwarf nova having a very short superhump periodof 76.67+/- 0.03 min (0.05324+/-0.00002 d). The next superoutburst was observedin March 2008. The recurrence time of superoutbursts (supercycle) is, hence,estimated to be ~480 d. The supercycle is much shorter than those of WZSge-type dwarf novae having supercycles of >~ 10 yr, which are a majorpopulation of dwarf novae in the shortest orbital period regime (<~85 min).Using a hierarchical cluster analysis, we identified seven groups of dwarfnovae in the shortest orbital period regime. We identified a small group ofobjects that have short supercycles, small outburst amplitudes, and largesuperhump period excesses, compared with those of WZ Sge stars. OTJ055717+683226 probably belongs to this group.

Dwarf Novae in the Shortest Orbital Period Regime: I. A New Short Period Dwarf Nova, OT J055717+683226