Resonances in the asteroid and trans-Neptunian belts: a brief review

TL;DR

This review summarizes recent advances in understanding mean motion resonances in the Solar System's small bodies, highlighting new dynamics, capture processes, and the significance of resonances in the trans-Neptunian region.

Contribution

It provides a comprehensive overview of recent theoretical, numerical, and observational developments in the study of resonances, including inclined and retrograde orbits, and introduces new terminology.

Findings

Retrograde resonance capture is more efficient than direct.

Exterior resonances with Neptune influence high perihelion orbits.

Multiple asteroids in three-body resonances were identified.

Abstract

Mean motion resonances play a fundamental role in the dynamics of the small bodies of the Solar System. The last decades of the 20th century gave us a detailed description of the dynamics as well as the process of capture of small bodies in coplanar or small inclination resonant orbits. More recently, semianalytical or numerical methods allowed us to explore the behavior of resonant motions for arbitrary inclination orbits. The emerging dynamics is very rich, including large orbital changes due to secular effects inside mean motion resonances. The process of capture in highly inclined or retrograde resonant orbits was addressed showing that the capture in retrograde resonances is more efficient than in direct ones. A new terminology appeared in order to characterize the properties of the resonances. Numerical explorations in the transneptunian region showed the relevance and the particular dynamics of the exterior resonances with Neptune which can account for some of the known high perihelion orbits in the scattered disk. Moreover, several asteroids evolving in resonance with planets other than Jupiter or Neptune were found and a large number of asteroids in three-body resonances were identified.