Astronomy:Commensurability
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Short description: Proportionality of orbital periods for two celestial bodies
Commensurability is the property of two orbiting objects, such as planets, satellites, or asteroids, whose orbital periods are in a rational proportion.
Examples include the 2:3 commensurability between the orbital periods of Neptune and Pluto,[1] the 3:4 commensurability between the orbital periods of the Saturnian satellites Titan and Hyperion,[2] the orbital periods associated with the Kirkwood gaps in the asteroid belt relative to that of Jupiter,[3] and the 2:1 commensurability between Gliese 876 b and Gliese 876 c.
Commensurabilities are normally the result of an orbital resonance, rather than being due to coincidence.
See also
References
- ↑ Williams, J. G.; Benson, G. S. (March 1971), "Resonances in the Neptune-Pluto System", Astronomical Journal 76: 167, doi:10.1086/111100, Bibcode: 1971AJ.....76..167W.
- ↑ Bevilacqua, R. et al. (April 1980), "Resonances and close approaches. I - The Titan-Hyperion case", Laboratorio di Astrofisica Spaziale di Frascati, European Workshop on Planetary Sciences, Rome, Italy, Apr. 23-27, 1979, 22, p. 141, doi:10.1007/BF00898423, Bibcode: 1980M&P....22..141B.
- ↑ Moons, Michèle (March 1996), "Review of the dynamics in the Kirkwood gaps", Celestial Mechanics and Dynamical Astronomy 65 (1−2): 175−204, doi:10.1007/BF00048446, Bibcode: 1996CeMDA..65..175M.
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