Orbital Resonances
First published: 2024
Brief summary
NASA feature on repeating gravitational patterns in planetary systems.
Article
Orbital resonance occurs when orbiting bodies have periods that form a ratio of small whole numbers. Their relative positions then repeat regularly, causing gravitational interactions to occur at similar points in successive orbits.
Repeated gravitational effects can stabilise an orbital arrangement by maintaining consistent phase relationships, or destabilise it by increasing eccentricity and producing close encounters. The result depends on the resonance, the masses involved and the geometry of the system.
Examples include the 2:1 relationship among several pairs of moons and the 3:2 resonance between Pluto and Neptune. Chains of resonances can link three or more bodies, as in the Laplace resonance among Jupiter’s moons Io, Europa and Ganymede.
Resonances influence the architecture and long-term evolution of planetary systems. They can shape rings and asteroid populations, alter rotation states, maintain orbital spacing and provide evidence about migration during the formation of planets and moons.
Source details and credits
- Source / publisher: NASA Science
- Source type: Educational article
- URL type: WWW
- Credits: NASA Science
- URL: https://science.nasa.gov/solar-system/orbital-resonances/