File:Buits de Kirkwood ca.svg

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English: This histogram clearly shows the primary Kirkwood gaps in the asteroid main-belt. These gaps (labeled "3:1", "5:2", "7:3", "2:1") are caused by mean-motion resonances between an asteroid and Jupiter. For example, the 3:1 Kirkwood gap is located where the ratio of an asteroid's orbital period to that of Jupiter is 3/1 (the asteroid completes 3 orbits for every 1 orbit of Jupiter). The effect of these mean-motion resonances is a change in the asteroid's orbital elements (particularly semimajor axis) sufficient to create these gaps in semimajor axis space.
Català: Aquest histograma mostra clarament els buits de Kirkwood primaris al cinturó principal d'asteroides. Aquests buits (amb l'etiqueta "03:01", "05:02", "07:03", "02:01") són causats per les ressonàncies del medi-moviment entre un asteroide i Júpiter. Per exemple, el buit Kirkwood 03:01 es troba on la relació del període orbital d'un asteroide a la de Júpiter és 3/1 (l'asteroide amb 3 òrbites per cada 1 òrbita de Júpiter). L'efecte d'aquestes ressonàncies del medi al moviment és un canvi en els elements orbitals de l'asteroide (particularment semieix major) suficients per crear aquests buits en l'espai de semieix major.
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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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