Solar system has an icy-planetoid ring {Kuiper belt}|, starting at Neptune and extending to Pluto, 4.6 billion miles from Sun. Kuiper-belt planetoids can orbit once every 200 to 400 years. Planetoids, such as Eris (Xena or 2003 UB313), can have highly elliptical orbits. Eris [2005] has methane surface, is three times larger than Pluto, has small moon (Gabrielle), and orbits at 45 degrees to ecliptic. Astronomers also discovered Sedna [2003] and Quaoar [2002].
plutino
Pluto and other planetoids {plutino} can orbit in resonance with Neptune. As Neptune orbits thrice, they orbit twice.
Physical Sciences>Astronomy>Solar System>Planetoid
5-Astronomy-Solar System-Planetoid
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Date Modified: 2022.0224