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SDSS J162718.39+120435.0 was suspected of being a dwarf nova fromspectroscopic observations made available by the Sloan Digital Sky Survey.Photometry conducted during the 2008 outburst, the first ever outburst of thisobject detected and followed up in real time, shows that the outburst reachedmagnitude 14.6 at maximum, had an amplitude of 4.6 magnitudes and lasted for atleast 18 days. Common superhumps were detected with an amplitude of up to 0.4magnitudes, confirming it to be a member of the SU UMa family. Initially thesuperhump period, Psh, was 0.10993(7) days (2.638 hours), but it subsequentlyreduced to Psh = 0.10890(9) days (2.614 hours) later in the outburst. Theperiod change corresponds to the end of the plateau period of the outburst. Theorbital period, Porb, was estimated from the two Psh values as between 0.1026 dand 0.1016 d, which places SDSS1627 near the centre of the period gap in theorbital period distribution of cataclysmic variables.

SDSS J162718.39+120435.0 - a dwarf nova in the period gap