{"id":2721,"date":"2015-05-28T04:36:18","date_gmt":"2015-05-28T04:36:18","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=2721"},"modified":"2015-06-04T04:21:27","modified_gmt":"2015-06-04T04:21:27","slug":"japet-un-curieux-satellite-noir-et-blanc-de-saturne","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/28\/japet-un-curieux-satellite-noir-et-blanc-de-saturne\/","title":{"rendered":"Japet, le curieux satellite noir et blanc de Saturne"},"content":{"rendered":"

Quand on parle des satellites de Saturne<\/a>, on pense imm\u00e9diatement \u00e0 Titan<\/a>, le plus gros, dont les oc\u00e9ans d’hydrocarbures nous fascinent, et qui a re\u00e7u la visite du module Huygens <\/a>il y a une d\u00e9cennie. D’autres lunes de Saturne int\u00e9ressent beaucoup les scientifiques, \u00e0 l’image de Japet.<\/p>\n

\"japet_satellite_saturne\"<\/a><\/p>\n

Japet, troisi\u00e8me satellite de Saturne par la taille (apr\u00e8s Titan et Rh\u00e9a<\/a>) a \u00e9t\u00e9 d\u00e9couvert en 1671 par l’astronome Jean-Dominique Cassini. Les mesures de densit\u00e9 indiquent que ce satellite est compos\u00e9 principalement de glace et d’environ 20 % de mati\u00e8re rocheuse.<\/p>\n

Tournant sur lui-m\u00eame en un peu plus de 79 jours, Japet a la particularit\u00e9 de pr\u00e9senter deux h\u00e9misph\u00e8res crat\u00e9ris\u00e9s de couleurs tr\u00e8s diff\u00e9rentes. Sa face avant (qui capture les poussi\u00e8res quand le satellite avance sur son orbite) est noire comme du charbon, alors que sa face arri\u00e8re est blanche comme neige.<\/p>\n

Autre curiosit\u00e9 pour Japet : un bourrelet \u00e9quatorial, sorte de cr\u00eate montagneuse haute de 13 km et longue de 1300, qui pourrait avoir \u00e9t\u00e9 form\u00e9e par la chute d’un anneau de d\u00e9bris provenant d’un petit satellite qui se serait bris\u00e9 autour de Japet.<\/p>\n

L’image ci-dessus, prise par la sonde Cassini <\/a>le 27 mars dernier \u00e0 une distance d’environ 1 million de km, montre la moiti\u00e9 de l’h\u00e9misph\u00e8re clair (avec les crat\u00e8res identiques Roland et Turpin) et la moiti\u00e9 de l’h\u00e9misph\u00e8re sombre avec les bassins Falsaron et Turgis.<\/p>\n","protected":false},"excerpt":{"rendered":"

Quand on parle des satellites de Saturne, on pense imm\u00e9diatement \u00e0 Titan, le plus gros, dont les oc\u00e9ans d’hydrocarbures nous fascinent, et qui a re\u00e7u la visite du module Huygens il y a une d\u00e9cennie. D’autres lunes de Saturne int\u00e9ressent beaucoup les scientifiques, \u00e0 l’image de Japet. Japet, troisi\u00e8me satellite de Saturne par la taille … Continuer la lecture de Japet, le curieux satellite noir et blanc de Saturne<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":2722,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[542,217,1017,570,755,136,567],"class_list":["post-2721","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-glace","tag-hemisphere","tag-japet","tag-mission-cassini-huygens","tag-module-huygens","tag-saturne","tag-titan"],"yoast_head":"\nJapet, le curieux satellite noir et blanc de Saturne<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/28\/japet-un-curieux-satellite-noir-et-blanc-de-saturne\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Japet, le curieux satellite noir et blanc de Saturne\" \/>\n<meta property=\"og:description\" content=\"Quand on parle des satellites de Saturne, on pense imm\u00e9diatement \u00e0 Titan, le plus gros, dont les oc\u00e9ans d’hydrocarbures nous fascinent, et qui a re\u00e7u la visite du module Huygens il y a une d\u00e9cennie. 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