{"id":12154,"date":"2020-06-27T09:37:04","date_gmt":"2020-06-27T09:37:04","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=12154"},"modified":"2020-07-30T09:09:25","modified_gmt":"2020-07-30T09:09:25","slug":"toledo-montes-la-mysterieuse-crete-equatoriale-de-japet","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/27\/toledo-montes-la-mysterieuse-crete-equatoriale-de-japet\/","title":{"rendered":"Toledo Montes, la myst\u00e9rieuse cr\u00eate \u00e9quatoriale de Japet"},"content":{"rendered":"<p><strong>C&#8217;est un curieux bourrelet \u00e9quatorial d\u00e9couvert par la sonde Cassini qui ceinture Japet, une des lunes de Saturne. Zoom sur <em>Toledo Montes<\/em>.<\/strong><\/p>\n<h5>Une lune en noir et blanc :<\/h5>\n<p>Quand on parle des satellites de\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/09\/17\/saturne-la-planete-qui-fait-naitre-des-vocations\/\" target=\"_blank\" rel=\"noopener noreferrer\">Saturne<\/a>, on pense imm\u00e9diatement \u00e0\u00a0<a title=\"Des \u00eeles myst\u00e9rieuses sur Titan\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/11\/29\/iles-mysterieuses-titan\/\" target=\"_blank\" rel=\"noopener noreferrer\">Titan<\/a>, le plus gros, dont les oc\u00e9ans d\u2019hydrocarbures nous fascinent, et qui a re\u00e7u la visite du module\u00a0<a title=\"Huygens sur Titan, c\u2019\u00e9tait il y a 10 ans\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/01\/17\/huygens-sur-titan-cetait-il-y-10-ans\/\" target=\"_blank\" rel=\"noopener noreferrer\">Huygens<\/a> en 2005. D\u2019autres lunes de Saturne int\u00e9ressent beaucoup les scientifiques, \u00e0 l\u2019image de Japet. Troisi\u00e8me satellite de Saturne par la taille (apr\u00e8s Titan et <a title=\"Des croissants de lunes autour de Saturne\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/12\/des-croissants-de-lunes-autour-de-saturne\/\" target=\"_blank\" rel=\"noopener noreferrer\">Rh\u00e9a<\/a>), Japet a \u00e9t\u00e9 d\u00e9couvert en 1671 par l\u2019astronome Jean-Dominique Cassini. Les mesures de densit\u00e9 indiquent qu&#8217;il est compos\u00e9 principalement de glace et d\u2019environ 20 % de mati\u00e8re rocheuse.<\/p>\n<figure id=\"attachment_2722\" aria-describedby=\"caption-attachment-2722\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/05\/japet_satellite_saturne.jpg\" rel=\"lightbox[12154]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-2722\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/05\/japet_satellite_saturne-450x338.jpg\" alt=\"\" width=\"450\" height=\"338\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/05\/japet_satellite_saturne-450x338.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/05\/japet_satellite_saturne.jpg 800w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-2722\" class=\"wp-caption-text\">Japet, un satellite noir et blanc qui gravite autour de Saturne. \u00a9 NASA<\/figcaption><\/figure>\n<p><span id=\"more-2721\"><\/span>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.<!--more--><\/p>\n<h5>Japet ressemble \u00e0 une noix :<\/h5>\n<p>Autre curiosit\u00e9 de Japet : un bourrelet \u00e9quatorial, sorte de cr\u00eate montagneuse haute en moyenne de 13 km qui court sur 1.300 km. C&#8217;est <em>Toledo Montes<\/em>, la plus haute et la plus longue cha\u00eene de montagnes du Syst\u00e8me solaire. Elle donne au satellite l&#8217;aspect d&#8217;une noix g\u00e9ante. Certains tron\u00e7ons de <em>Toledos Montes<\/em> atteignent l&#8217;altitude de 20 kilom\u00e8tres. Ils sont si hauts que le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/11\/09\/coucher-de-soleil-derriere-lobservatoire-du-pic-du-midi\/\" target=\"_blank\" rel=\"noopener noreferrer\">Soleil<\/a> les \u00e9claire en permanence, qu&#8217;il fasse jour ou nuit sur l&#8217;h\u00e9misph\u00e8re concern\u00e9.<\/p>\n<figure id=\"attachment_12155\" aria-describedby=\"caption-attachment-12155\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/06\/japet.jpg\" rel=\"lightbox[12154]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12155\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/06\/japet-450x269.jpg\" alt=\"\" width=\"450\" height=\"269\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/06\/japet-450x269.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/06\/japet-1024x613.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/06\/japet-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/06\/japet.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-12155\" class=\"wp-caption-text\">Toledo Montes est une \u00e9trange cr\u00eate qui court sur Japet, satellite de Saturne.\u00a9 NASA<\/figcaption><\/figure>\n<p>Cette cr\u00eate montagneuse a \u00e9t\u00e9 d\u00e9couverte sur les images prises par la sonde Cassini le 31 d\u00e9cembre 2004 alors qu&#8217;elle se trouvait \u00e0 123.000 km de distance. Un spectaculaire survol de Japet beaucoup plus rapproch\u00e9 le 10 septembre 2007 a permis de la photographier avec une meilleure r\u00e9solution.<\/p>\n<figure id=\"attachment_12156\" aria-describedby=\"caption-attachment-12156\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/06\/japet2.jpg\" rel=\"lightbox[12154]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12156\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/06\/japet2-450x450.jpg\" alt=\"\" width=\"450\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/06\/japet2-450x450.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/06\/japet2-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/06\/japet2-768x768.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/06\/japet2.jpg 1020w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-12156\" class=\"wp-caption-text\">Gros plan sur une partie de Toledo Montes r\u00e9alis\u00e9 le 10 septembre 2007 par la sonde Cassini alors qu&#8217;elle se trouvait\u00a0 \u00e0 une distance de 3.900 km. \u00a9 NASA<\/figcaption><\/figure>\n<p>D&#8217;o\u00f9 vient ce bourrelet ? De la chute d\u2019un anneau de d\u00e9bris provenant d\u2019un petit corps qui se serait bris\u00e9 autour de Japet ? Est-ce le r\u00e9sidu d&#8217;une \u00e9poque o\u00f9 le satellite tournait beaucoup plus vite sur lui-m\u00eame ? \u00c0 moins qu&#8217;il ne s&#8217;agisse de mat\u00e9riau remont\u00e9 \u00e0 la surface \u00e0 travers une faille ? Pour l&#8217;instant l&#8217;origine de <em>Toledo Montes<\/em> reste une \u00e9nigme&#8230;<\/p>\n<p><iframe loading=\"lazy\" title=\"Saturne, la g\u00e9ante aux anneaux de glace et de poussi\u00e8re | Futura\" width=\"474\" height=\"267\" src=\"https:\/\/www.youtube.com\/embed\/0MxLMxSupDY?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>C&#8217;est un curieux bourrelet \u00e9quatorial d\u00e9couvert par la sonde Cassini qui ceinture Japet, une des lunes de Saturne. Zoom sur Toledo Montes. Une lune en noir et blanc : Quand on parle des satellites de\u00a0Saturne, on pense imm\u00e9diatement \u00e0\u00a0Titan, le plus gros, dont les oc\u00e9ans d\u2019hydrocarbures nous fascinent, et qui a re\u00e7u la visite du &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/27\/toledo-montes-la-mysterieuse-crete-equatoriale-de-japet\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Toledo Montes, la myst\u00e9rieuse cr\u00eate \u00e9quatoriale de Japet<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":12155,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[1017,570,136,2901],"class_list":["post-12154","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-japet","tag-mission-cassini-huygens","tag-saturne","tag-toledo-montes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Toledo Montes, la myst\u00e9rieuse cr\u00eate \u00e9quatoriale de Japet<\/title>\n<meta name=\"description\" content=\"C&#039;est un curieux bourrelet \u00e9quatorial d\u00e9couvert par la sonde Cassini qui ceinture Japet, une des lunes de Saturne. 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