Largest Oort Cloud comet

The largest comet in the Oort Cloud is C/2014 UN271 (Bernardinelli-Bernstein), which has an estimated diameter of 119 km (73.9 mi). It was discovered by Pedro Bernardinelli (BRA) and Gary Bernstein (USA) using images taken between 2014 and 2018. The original discovery was published in The Astrophysical Journal Letters on 10 November 2021, and the follow-up observations which verified the comet's size were published in the same journal on 10 April 2022.

The largest comet in the solar system is 2060 Chiron, an unusual object that blurs the lines between comets and asteroids. It has a more or less circular orbit within the Solar System's main asteroid belt, inside the orbit of Jupiter.