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