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Kozai mechanism

(Lidov-Kozai mechanism, Lidov-Kozai effect)
(an effect on an orbit by another, more distant orbiting body)

The Kozai mechanism (Lidov-Kozai mechanism or Lidov-Kozai effect) is a type of effect on a body's orbit by another body orbiting further from the primary body causing secular oscillations in orbital inclination and eccentricity, i.e., a Kozai oscillation (or LK oscillation or Kozai cycle). For example, the Moon could affect an artificial satellite also orbiting Earth by the mechanism. The mechanism is significant for some asteroids, moons, and extra-solar planets. The effect was first described by Soviet, Michael Lidov in 1961 and Japanese, Yoshihide Kozai in 1962.

(celestial mechanics,dynamics)
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black hole merger