### orbital resonance

(tendency of orbits of two bodies to remain in a simple pattern)

**Orbital resonance** is a stable configuration of the orbits of
two bodies orbiting the same third, such that their orbital periods
are related by two small integers. Kinematically, such an
orbital relationship is termed **commensurability**, which can develop
when the forces of gravity while the two are relatively close
to each other tend to draw them toward it, and can remain stable when
gravity provides negative feedback to any move away from it.

The orbital periods of three of Jupiter's moons form
such ratios
and the orbital periods of Pluto and Neptune have a ratio
of 3:2. Such a resonance, where there is a simple integer
ratio between the periods is called a **mean motion resonance**
(**MMR**).

A **secular resonance** is a resonance of orbits not on each
circuit, but on a longer-term (secular) pattern.
It might show up as a pattern in the orbits' precessions.
The term is common in analysis of the orbits of asteroids
and other minor planets.

(*celestial mechanics,dynamics,orbits*)
http://en.wikipedia.org/wiki/Orbital_resonance

http://en.wikipedia.org/wiki/Secular_resonance

**Referenced by:**

corotation resonance (CR)

Kirkwood gap

Kuiper Belt (K Belt)

late heavy bombardment (LHB)

Lindblad torque

Neptune

Pluto

plutoid

Q factor

tidal heating

index