  Photometric and spectroscopic observations of the unstudied 12th-magnitude
eclipsing binary GSC 04778-00152 are presented. We report the discovery of a
visual companion about 1 mag fainter and 2 arcsec away from the binary. By
subtracting the light contribution of the visual companion, we obtain the UBVRI
light curves of the binary system alone. The shape of the light curve indicates
that GSC 04778-00152 is an A-type W UMa contact binary. From light-curve
modeling, we derive parameters of the binary system.
