Icy Wanderer Chiron Encircled by Rings and a Disk ⚡ экспресс
Based on a multi-chord stellar occultation by the centaur (2060) Chiron on September 10, 2023, a complex system of circumplanetary material was detected. High-quality light curves reveal three narrow rings with mean radii of 273, 325, and 438 km; the outermost lies beyond the Roche limit. The rings are coplanar (pole orientation λ=151°±4°, β=20°±6°). A more extended disk-like structure is also observed in the 200–800 km range, along with a faint feature at ~1380 km. Chiron becomes the fourth known small body with rings. Comparison with occultations since 1994 demonstrates the variability of these structures. Possibly, for the first time, an active process of ring system formation and evolution has been captured.
Only by passing in front of a star did Chiron reveal its secret. Three icy hoops encircle the 200-kilometer body—a hybrid of comet and asteroid. Previously, they were only hinted at by spectra of reflected light and brightness fluctuations. Now the star winked three times, and the icy round dance was unveiled.
Gravitational forces no longer tear the dust apart, allowing it to clump together. Why we see another hoop instead of a moon is unknown. Nearby—a dust disk and a tiny object off to the side: likely a moon embryo.
Comparing images over 30 years showed: the rings are changing. Today we see a new planetary system—of snow and stones—coiling around the icy wanderer.
🎯 Chiron's rings can't be seen through a telescope—they're betrayed only by fast star winks during an occultation.