Best-fitting ellipse (in black) to the 19 chords presented in Table A.3 (for chord #4 only egress time is used). The fitted ellipse determines the projected shape of Huya at the moment of the occultation and has axes of 435.2 ± 7.0 km × 388.2 ± 12.2 km. The gray ellipses are the best-fitting ellipses to the 10⁴ randomly generated chord extremities (see Sect. 5.1 for details). The black dots are the centers of the chords, and the gray line crossing all the chords is a weighted linear fit to these dots. The black solid lines in the extremities of the chords are the 1σ uncertainties of the ingress and egress times. The red arrow shows the direction of the shadow motion. The chord numbers are the same as those used in Tables A.1 and A.3 and Fig. 4. The negative detection at QOS Observatory in Ukraine (light gray line at the left of the ellipse) helps to constrain the limb fit.