Rotational light curves of Bienor. In (a), we present the rotational light curve using 2021 data, while (b) shows the 2023 observational data. The vertical line indicates the rotational phase during Occ. A, B, and C, respectively. In both panels, the dashed lines show the uncertainty after studying how the 0.0002 h error propagates with time. A unique color represents each observation day. At the bottom, the difference (residual) between the modeled curve and the observational data is shown.