Bienor shape model as observed from Earth during Occ. B at a rotational phase of 0.15. The top panel showcases chords from Occ. B overlaid onto the shape model, demonstrating that the shape of the projected ellipse corresponds closely to the least-squares fitted ellipse outlined in Section 3.1. The bottom panel shows the same but with coloring. The colors denote the solar incidence angle. The white arrow points toward the rotation pole.