CCD photometry of the classical nova RW UMi during 10 nights in 1995 through an R filter and 14 nights in 1997 through a ‘ clear ’ filter , with the 1-m Wise telescope yields a periodic modulation in the light curve with the period 0.05912 \pm 0.00015 d and a semi amplitude of 0.025 mag .
We discuss several explanations for the periodicity , and suggest that it is likely to be the orbital period of the binary system or a superhump period .
RW UMi is thus a candidate for the classical nova with the shortest known orbital period .