Editing Ring system (section)

===Haumea===
{{main|Rings of Haumea}}
[[File:Haumea with rings (37641832331).jpg|thumb|Artist's depiction of Haumea's ring system]]
A ring around [[Haumea]], a [[dwarf planet]] and [[Resonant trans-Neptunian object|resonant Kuiper belt member]], was revealed by a stellar occultation observed on 21 January 2017. This makes it the first [[trans-Neptunian object]] found to have a ring system.<ref name="Sickafoose2017"/><ref name="Ortiz2017"/> The ring has a radius of about {{val|2287|u=km|fmt=commas}}, a width of ≈{{val|70|u=km}} and an opacity of 0.5.<ref name="Ortiz2017"/> The ring plane coincides with Haumea's equator and the orbit of its larger, outer moon [[Moons of Haumea|Hi’iaka]]<ref name="Ortiz2017"/> (which has a semimajor axis of ≈{{val|25657|u=km|fmt=commas}}). The ring is close to the 3:1 [[orbital resonance|resonance]] with Haumea's rotation, which is located at a radius of {{val|2285|8|u=km|fmt=commas}}.<ref name="Ortiz2017"/> It is well within Haumea's [[Roche limit]], which would lie at a radius of about {{val|4400|u=km|fmt=commas}} if Haumea were spherical (being nonspherical pushes the limit out farther).<ref name="Ortiz2017"/>