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We report CCD photometry and analysis of the first observed superoutburst ofthe SU UMa-type dwarf nova KP Cassiopeiae during 2008 October. We observed adistinct shortening of the superhump period at superhump cycle 15. Before thatpoint Psh was 0.08556(3) d and afterwards it evolved from 0.08517(2) d to0.08544(3) d with a rate of period change dPsh/dt = 3.2(2) * 10-5. We measuredthe likely orbital period as 0.0814(4) d placing KP Cas just below the periodgap. The superhump period excess is 0.048(5) and, empirically, the mass ratio qis 0.20(2). The superoutburst lasted between 8 and 12 days, peaked close tomagnitude 13 with an amplitude above quiescence of 5 magnitudes, and faded for4 days at a rate of 0.14 mag/d. Close monitoring following the end of thesuperoutburst detected a single normal outburst 60 days later which reachedmagnitude 14.7 and lasted less than 3 days.

CCD photometry of the first observed superoutburst of KP Cassiopeiae in 2008 October