  We find from high speed photometry of the Sloan Digital Survey cataclysmic
variable candidate SDSS J161033.64-010223.3 that it has a double humped
modulation, which is probably orbital, with a period of 80.52 minutes, and
shows strong ZZ Cet type pulsations. The largest amplitude oscillations have
periods near 607, 345, 304 and 221 s. The amplitudes of some of the
oscillations are seen to vary on time scales of hours, indicating modes with
unresolved multiplets in which the splittings are ~1 d^-1. This is only the
second dwarf nova found to have non-radial pulsations of its white dwarf
primary.

Astrophysics