The orbital period of the eclipsing dwarf nova V729 Sagittarii

We have discovered that V729 Sgr, an object listed as a possible rapid irregular variable in the fourth edition of the General Catalogue of Variable Stars, is an eclipsing cataclysmic variable with an orbital period of 0.1734055 days and an eclipse depth of 0.2-0.5 mag. The shape of the light curve is quite variable. When observed in the R filter the light curve presents a pronounced sinusoidal modulation with an amplitude of similar to 0.4-0.5 mag. In addition, brightness variations with timescales and characteristics suggesting dwarf nova eruptions are seen in the historical photometric data and in the our own data. We classify V729 Sgr as a new member of dwarf nova class, possibly of Z Cam type.