The orbital period of the eclipsing dwarf nova V729 Sagittarii

We have discovered that V729 Sgr, an object listed as a possible rapid irre gular variable in the fourth edition of the General Catalogue of Variable S tars, is an eclipsing cataclysmic variable with an orbital period of 0.1734 055 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 m ag. 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 nov a class, possibly of Z Cam type.