Fig. 3: Chords and projected ellipses from the ellipsoidal fits to Hi'iaka's shape as observed during the two stellar occultations, shown with respect to the offsets between Hiʻiaka’s observed positions and its predicted positions from the Miriade ephemeris combined with Haumea’s JPL#110 orbit.

Left panel: The black ellipse represents the best fit to the positive chords from the stellar occultation on April 16^th using least-squares minimization. The gray shaded region represents the solutions from the Monte Carlo simulations. The black arrow at the bottom shows the direction of the body motion. The segments of different colors correspond to the chords from the observing sites indicated in the legend (using the nomenclature of Table 2). Right panel: The single positive chord from the occultation on April 6^th is shown (red line) fitted to the ellipses obtained after projecting the 3D model to the corresponding rotational phase at the moment of the April 6^th occultation. The small black dots indicate the center of the ellipses. In both panels the errors of the chords are present but may be too small to see.