Positive and Negative Superhumps of the Dwarf Nova MN Dra

We present the result of O-C analysis of the dwarf nova MN Dra. It is based on the multi-site photometric observations that were made over 77 nights in August - November, 2009. The total exposure was 433 hours. During this time binary underwent two superoutbursts and five normal outbursts. In superoutbursts the positive superhumps decreased with extremely large ˙ P = −(3 − 8) × 10 �4 for SU UMa-like dwarf novae, confirming the known behavior of MN Dra in 2003. MN Dra displayed large-amplitude (up to 1.4 m in quiescence and 0.1 m -0.2 m in normal outbursts) negative superhumps. The improved value of negative superhump period is 0.095952(4) d.