Stellar occultation in 1993: Adapted from Fig. 5 of Bus et al. (1996) in which the sky plane for the region surrounding Chiron is shown. The ellipse (dashed line) shows the ring of Chiron that would cause the A4 feature and is compatible with the orientation derived from the two pole solutions derived from the 2011 occultation. The position angle is 1 degree, and the aspect angle is 30 degrees or 150 degrees. The star symbol indicates another intersection of the ring with the star path for site 4, where another secondary event should have been detected from site 4 (see text), and the small squares show locations where secondary events should have been detected if the observations at the particular observing sites obtained data with high signal-to-noise ratio, which was not the case. The disk of Chiron is shown based on a circular fit to the occultation chords, but in green we show an alternative disk of Chiron. See main text.
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