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Fig. 1


Stellar occultation in 2011: the plus symbols indicate the locations in the plane of the sky where the sharp events in the lightcurves of Ruprecht (2013) took place. The upper points correspond to events detected from the Faulkes 2 m telescope in Haleakala, whereas the points below correspond to secondary events as seen from the IRTF 3 m telescope at Mauna Kea. The ellipse in thick black line shows a possible fit to the secondary events within a range of possible fits that satisfy several constraints (see text). The semi-major axis is 313 km and the semi-minor axis is 272 km. The ellipse in red line is an example of another possible fit. The semi-major axis of the ellipse is 324 km whereas the semi-minor axis is 228 km. The small dashed segment corresponds to the occultation chord of Chiron from IRTF. The smaller ellipse shows a tentative projected shape for Chiron that is compatible with the IRTF chord and is concentric with the ring system. The dimensions of this smaller ellipse are 190 and 143 km.

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