{"id":7805,"date":"2017-06-05T08:13:53","date_gmt":"2017-06-05T08:13:53","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7805"},"modified":"2017-06-12T17:15:05","modified_gmt":"2017-06-12T17:15:05","slug":"zoom-pole-nord-dencelade-satellite-de-saturne","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/05\/zoom-pole-nord-dencelade-satellite-de-saturne\/","title":{"rendered":"Zoom sur le P\u00f4le nord d&#8217;Encelade, satellite de Saturne"},"content":{"rendered":"<p><strong>Encelade est l&#8217;un des satellites qu&#8217;a longuement \u00e9tudi\u00e9 la sonde Cassini, d\u00e9sormais en route pour son grand plongeon en direction de Saturne.<\/strong><\/p>\n<p>Toutes les belles choses ont une fin : le 15 septembre prochain la sonde am\u00e9ricaine Cassini plongera dans l&#8217;\u00e9paisse atmosph\u00e8re de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/03\/04\/lumiere-cendree-dione-satellites-de-saturne\/\" target=\"_blank\" rel=\"noopener noreferrer\">Saturne<\/a>, mettant fin \u00e0 une extraordinaire mission commenc\u00e9e il y a 13 ans dans la banlieue de la sixi\u00e8me plan\u00e8te du Syst\u00e8me solaire. Plus d&#8217;une d\u00e9cennie d&#8217;images \u00e9tonnantes et de mesures in\u00e9dites concernant Saturne et ses <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/07\/03\/linclinaison-des-anneaux-de-saturne-de-2004-a-2015\/\" target=\"_blank\" rel=\"noopener noreferrer\">anneaux<\/a>, bien s\u00fbr, mais \u00e9galement un grand nombre des quelques 60 satellites qui gravitent autour.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/05\/encelade.jpg\" rel=\"lightbox[7805]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-7806\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/05\/encelade-450x450.jpg\" alt=\"\" width=\"450\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/05\/encelade-450x450.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/05\/encelade-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/05\/encelade-768x768.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/05\/encelade.jpg 1020w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Cette image r\u00e9alis\u00e9e le 27 novembre dernier \u00e0 une distance de 32.000 km nous permet de d\u00e9tailler le P\u00f4le nord d&#8217;Encelade. \u00a0<!--more--><\/p>\n<p>Encelade est un petit satellite de 500 km de diam\u00e8tre qui fut d\u00e9couvert par <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/12\/telescope-william-herschel\/\" target=\"_blank\" rel=\"noopener noreferrer\">William Herschel<\/a> en 1789 (mais cet astronome britanique est surtout connu pour la d\u00e9couverte d&#8217;<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/11\/20\/tempetes-geantes-sur-uranus\/\" target=\"_blank\" rel=\"noopener noreferrer\">Uranus<\/a> 8 ans plus t\u00f4t). Encelade est le sixi\u00e8me satellite de Saturne par la taille (le plus grand \u00e9tant <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/01\/17\/huygens-sur-titan-cetait-il-y-10-ans\/\" target=\"_blank\" rel=\"noopener noreferrer\">Titan<\/a>) et le quatorzi\u00e8me par l&#8217;\u00e9loignement (il orbite \u00e0 environ 240.000 km de la plan\u00e8te).<\/p>\n<p>La zone polaire nord d&#8217;Encelade que nous d\u00e9couvrons sur <a href=\"https:\/\/www.jpl.nasa.gov\/spaceimages\/details.php?id=PIA21326\" target=\"_blank\" rel=\"noopener noreferrer\">cette image<\/a> est fortement crat\u00e9ris\u00e9e (avec quelques crevasses), ce qui signifie que la surface n&#8217;a pas \u00e9t\u00e9 remodel\u00e9e depuis longtemps. Il s&#8217;agit d&#8217;une banquise dont l\u2019\u00e9paisseur est estim\u00e9e entre 30 et 40 km et qui cache tr\u00e8s certainement un\u00a0<a href=\"http:\/\/www.futura-sciences.com\/magazines\/espace\/infos\/actu\/d\/systeme-solaire-satellite-encelade-abriterait-bien-ocean-global-59894\/\" target=\"_blank\" rel=\"noopener noreferrer\">oc\u00e9an global<\/a>. Le paysage est tr\u00e8s diff\u00e9rent de celui qu&#8217;on observe dans la\u00a0zone polaire sud o\u00f9 l&#8217;\u00e9paisseur de la banquise n&#8217;exc\u00e8de pas quelques m\u00e8tres, laissant s&#8217;\u00e9chapper des jets de glace d\u2019eau m\u00e9lang\u00e9e \u00e0 des sels de sodium.<\/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>Encelade est l&#8217;un des satellites qu&#8217;a longuement \u00e9tudi\u00e9 la sonde Cassini, d\u00e9sormais en route pour son grand plongeon en direction de Saturne. Toutes les belles choses ont une fin : le 15 septembre prochain la sonde am\u00e9ricaine Cassini plongera dans l&#8217;\u00e9paisse atmosph\u00e8re de Saturne, mettant fin \u00e0 une extraordinaire mission commenc\u00e9e il y a 13 &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/05\/zoom-pole-nord-dencelade-satellite-de-saturne\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Zoom sur le P\u00f4le nord d&#8217;Encelade, satellite de Saturne<\/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":7806,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[646,136,754,567,129],"class_list":["post-7805","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-encelade","tag-saturne","tag-sonde-cassini","tag-titan","tag-william-herschel"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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