Resonant trans-Neptunian object
In astronomy, a resonant trans-Neptunian object is a trans-Neptunian object (TNO) in mean-motion orbital resonance with Neptune. The orbital periods of the resonant objects are in a simple integer relations with the period of Neptune, e.g. 1:2, 2:3, etc. Resonant TNOs can be either part of the main Kuiper belt population, or the more distant scattered disc population.
The orbital period of 2001 XT254 around the 3:7 (2.333) resonance of Neptune.
The orbital period of 1995 TL8 missing the 3:7 (2.333) resonance of Neptune.
A trans-Neptunian object (TNO), also written transneptunian object, is any minor planet in the Solar System that orbits the Sun at a greater average distance than Neptune, which has an orbital semi-major axis of 30.1 astronomical units (au).
Pluto imaged by New Horizons
Euler diagram showing the types of bodies in the Solar System.
Looking back at Pluto, the largest visited KBO so far