Bienor’s rotational light curve was obtained using data from the 1.23-m and 1.5-m telescopes (see Sect. 5 for a detailed explanation on the telescopes used here). The data were folded using a rotational period of 9.1719 ± 0.0002 h, being the zero rotational phase at the time of the occultation. Different colours represent different observation nights as described by the legend. The blue line represents a second-order Fourier-function fit to the observational data, the peak-to-valley amplitude of the fit has a value of 0.172 ± 0.003 mag. At the bottom panel, gray dots represent the residual of the fit to the observational data, with a standard deviation of 0.02 mag.