Analysis of the light curves of the fuor V 1057 Cyg

Observations made by the author and taken from the literature have been used to construct composite standardized light curves of the FU Orion star (fuor) V 1057 Cyg in the UBVR bands up to 1982. The circumstellar reddening and the radius and temperature of the star before and after the outburst have been determined. During the outburst, the star increased its radius from 3.5 to 17 solar radii and its temperature from 4600 K to 9000 K and ejected a dust shell which subsequently remained unchanged. Since the outburst, the star has cooled without changing its radius, and the various signs of peculiarity have gradually weakened. The observed track of the fuor in the color-magnitude diagram shows a tendency for the star to be displaced to the region of yellow giants