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When observing the blazars, we identified a new eclipsing binary GSC03517-00663. The light curves of GSC 03517-00663 are typical EW-type lightcurves. Based on the observation using the 1m telescope at Weihai Observatoryof Shandong University, complete VRI light curves were determined. Then, weanalyzed the multiple light curves using the W-D program. It is found that GSC03517-00663 has a mass ratio of q=0.164 and a contact degree of f=69.2%. GSC03517-00663 is a deep, low mass ratio overcontact binary. The light curves ofGSC 03517-00663 show strong O'Connell effect, it was explained by employing adark spot on the secondary component.

Discovery of a deep, low mass ratio overcontact binary GSC 03517-00663