{"id":1138,"date":"2004-11-16T10:43:00","date_gmt":"2004-11-16T09:43:00","guid":{"rendered":"https:\/\/kids.esa.int\/asteroid_families\/"},"modified":"2026-10-08T00:36:26","modified_gmt":"2026-10-07T22:36:26","slug":"asteroid_families","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/asteroid_families\/","title":{"rendered":"Les familles d'ast\u00e9ro\u00efdes"},"content":{"rendered":"
\n

On sait aujourd'hui que C\u00e9r\u00e8s mesure environ 940 km de large, soit environ un quart de la taille de la Lune. Elle repr\u00e9sente pourtant plus d'un quart de la masse totale de tous les ast\u00e9ro\u00efdes.<\/p>\n<\/div>\n

Seize autres ast\u00e9ro\u00efdes mesurent plus de 240 km de large. Mais la plupart des ast\u00e9ro\u00efdes ne sont que des rochers ou des grosses pierres de quelques m\u00e8tres de diam\u00e8tre. Si tous \u00e9taient r\u00e9unis en un seul objet, cet ast\u00e9ro\u00efde serait toujours plus petit que la Lune. Certains ast\u00e9ro\u00efdes sont faits de pierre, d'autres de m\u00e9tal comme le fer et le nickel. La plupart sont noirs-bruns et riches en carbone.<\/p>\n

De nombreux ast\u00e9ro\u00efdes appartiennent \u00e0 des familles. Chaque famille a la m\u00eame couleur et semble \u00eatre faite des m\u00eames mat\u00e9riaux. Ils se d\u00e9placent \u00e9galement tr\u00e8s pr\u00e8s les uns des autres dans diff\u00e9rentes parties de la ceinture principale. L'une des plus grandes familles est la famille Flora, qui comprend environ 400 membres identifi\u00e9s.<\/p>\n

On trouve aussi des ast\u00e9ro\u00efdes hors de la ceinture principale. Ils ont \u00e9t\u00e9 expuls\u00e9s de leur place par la forte gravit\u00e9 de Jupiter ou encore apr\u00e8s \u00eatre entr\u00e9s en collision avec d'autres ast\u00e9ro\u00efdes. Certains sont devenus les lunes de la plan\u00e8te g\u00e9ante. Des centaines de milliers d\u2019ast\u00e9ro\u00efdes, dont certains sont tr\u00e8s grands, se d\u00e9placent pr\u00e8s de la Terre.<\/p>","protected":false},"excerpt":{"rendered":"

Ceres is now known to have a width of about 940 km – about one quarter (one fourth) the size of Earth’s Moon. But it accounts for more than one […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2002\/04\/typical_orbits_for_inner_solar_system_asteroids2\/17865268-3-eng-GB\/Typical_orbits_for_inner_solar_system_asteroids.jpg","esa_banner_description":"Typical orbits for inner solar system asteroids","esa_banner_credit":"ESA 2002. Illustration by Medialab","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2002\/04\/Typical_orbits_for_inner_solar_system_asteroids2","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[46,10,11],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-1138","post","type-post","status-publish","format-standard","hentry","category-comets-and-meteors","category-learn","category-our-universe","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1138","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/comments?post=1138"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1138\/revisions"}],"predecessor-version":[{"id":2281,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1138\/revisions\/2281"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=1138"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=1138"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=1138"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=1138"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=1138"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=1138"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=1138"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=1138"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=1138"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=1138"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}