Planet
Gonggong
Dwarf planet
Gonggong is a dwarf planet and a member of the scattered disc beyond Neptune. It has a highly eccentric and inclined orbit during which it ranges from 33–101 astronomical units from the Sun. As of 2026, its distance from the Sun is 89.7 AU, and it is the sixth-farthest known Solar System object. According to the Deep Ecliptic Survey, Gonggong is in a 3:10 orbital resonance with Neptune, in which it completes three orbits around the Sun for every ten orbits completed by Neptune. Gonggong was discovered in July 2007 by American astronomers Megan Schwamb, Michael Brown, and David Rabinowitz at the Palomar Observatory, and the discovery was announced in January 2009.
Description from Wikipedia (CC BY-SA 4.0).
Key facts
Distance
Outer solar system
Mean radius
615 km
Orbital period
551 years
Discovered
2007 · Michael E. Brown
