Orbital resonance
In
celestial mechanics,
orbital resonance occurs when two orbiting bodies have periods of revolution that are in a simple integer ratio so that they exert a regular gravitational influence on each other. This can stabilize the orbits and protect them from gravitational perturbation. For instance:
- Pluto and some smaller bodies called Plutinos were saved from ejection by a 3:2 resonance with Neptune.
- The Trojan asteroids may be regarded as being protected by a 1:1 resonance with Jupiter.
Orbital resonance can also destabilize one of the orbits. For instance:
- There is a series of almost empty lanes in the asteroid belt called Kirkwood gaps where the asteroids would be in resonance with Jupiter.
A
Laplace resonance occurs when three or more orbiting bodies have a simple integer ratio between their orbital periods. For example, Jupiter's moons
Ganymede,
Europa, and
Io are in a 1:2:4 orbital resonance.
See also