A newly discovered SU UMa-type dwarf nova, HS 1449+6415

We report time-resolved photometric observations of the Hamburg Quasar Surv ey-selected dwarf nova HS 1449+6415 (= RXJ1450.5+6403) during the interval from JD 2451672 to 2451724. During a long outburst with a duration of simil ar to 12 days, we detected superhumps with a period of 0.(d)0601(5), reveal ing that this star is an SU UMa star. A short outburst which lasted 3 days was found about 40 days after the onset of the superoutburst. From quiescen ce observations, we determine an orbital period of 0.(d)05898(2). The small outburst amplitude of similar to3.5 mag, the short orbital period, and the normal outburst cycle length suggest that HS 1449+6415 is an intermediate object between ER UMa stars with high mass-transfer rates and WZ Sge stars with Very low mass-transfer rates.