CAOSP abstracts, Volume: 42, No.: 1, year: 2012

Abstract: We present our UBVR_CI_C CCD photometry of a new dwarf nova OT J213806.6+261957 in Pegasus, discovered during its superoutburst on May 6, 2010 and classified as a WZ Sge-type star. In the term May 15 — November 27, 2010, we obtained more than 10 000 CCD observations of the nova. Two-colour diagrams together with the superoutburst evolutionary tracks of the nova are presented. The analysis of our data revealed the presence of ordinary superhumps with the mean period of 0.055106 d and late superhumps with the period of 0.05490 d. We calculated the orbital period of the dwarf nova Pegasi 2010 to be 0.0542 d ± 0.005 and estimated the mass of the red dwarf component in the binary as 0.09 ± 0.01 M_☉. The period change of superhumps of the dwarf nova Pegasi 2010 is in agreement with other WZ Sge-type stars. The evolution of superhumps profiles is discussed. The superoutburst of the dwarf nova Pegasi 2010 finished at the end of September 2010. In October and November 2010 night-to-night brightness variations as well as a flickering on a time scale of minutes were detected.