{"id":5446,"date":"2016-04-20T15:08:07","date_gmt":"2016-04-20T15:08:07","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=5446"},"modified":"2016-04-30T08:30:57","modified_gmt":"2016-04-30T08:30:57","slug":"encelade-janus-dessus-anneaux-de-saturne","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/04\/20\/encelade-janus-dessus-anneaux-de-saturne\/","title":{"rendered":"Encelade et Janus au-dessus des anneaux de Saturne"},"content":{"rendered":"<p><strong>La sonde Cassini se trouvait \u00e0 un peu plus d&#8217;un million de km de Saturne quand elle a photographi\u00e9 les satellites Encelade et Janus.<\/strong><\/p>\n<p><a href=\"http:\/\/photojournal.jpl.nasa.gov\/catalog\/PIA18360\" target=\"_blank\">Cassini<\/a>, la sonde am\u00e9ricaine qui a commenc\u00e9 \u00e0 explorer <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/03\/29\/dame-lune-se-glisse-entre-saturne-antares-et-mars\/\" target=\"_blank\">Saturne <\/a>et sa banlieue en 2004, nous offre une nouvelle image de la plan\u00e8te aux anneaux et de deux de ses satellites, Encelade (le plus gros \u00e0 gauche) et Janus (dont la luminosit\u00e9 a \u00e9t\u00e9 rehauss\u00e9e d&#8217;un facteur 2 pour qu&#8217;il apparaisse sur la photo).<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" frameborder=\"0\" width=\"480\" height=\"270\" src=\"\/\/www.dailymotion.com\/embed\/video\/x2h3se0\" 0=\"allowfullscreen&gt;&lt;\/iframe\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<p style=\"text-align: center\"><strong>En vid\u00e9o : un sous-marin sur Titan, dans les profondeurs du lac Kraken Mare<\/strong><\/p>\n<p>Encelade (505 km de diam\u00e8tre) a \u00e9t\u00e9 d\u00e9couvert par l&#8217;astronome germano-britannique <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/12\/telescope-william-herschel\/\" target=\"_blank\">William Herschel<\/a> en 1789. Ce satellite intrigue beaucoup les astronomes depuis qu&#8217;on a d\u00e9couvert il y a une dizaine d\u2019ann\u00e9es que sa cro\u00fbte glac\u00e9e laissait \u00e9chapper des geysers compos\u00e9s de vapeur d\u2019eau et de mati\u00e8re organique. Les scientifiques en sont arriv\u00e9s \u00e0 la conclusion qu&#8217;Encelade abrite un <a href=\"http:\/\/www.futura-sciences.com\/magazines\/espace\/infos\/actu\/d\/systeme-solaire-satellite-encelade-abriterait-bien-ocean-global-59894\/\" target=\"_blank\">oc\u00e9an global<\/a> sous une <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/10\/18\/gros-plan-sur-la-banquise-dencelade-satellite-de-saturne\/\" target=\"_blank\">banquise <\/a>\u00e9paisse de 30 \u00e0 40 km.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/04\/saturne1.jpg\"  rel=\"lightbox[5446] attachment wp-att-5448\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-5448\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/04\/saturne1-450x450.jpg\" alt=\"saturne1\" width=\"450\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/04\/saturne1-450x450.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/04\/saturne1-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/04\/saturne1-768x768.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/04\/saturne1-1024x1024.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/04\/saturne1.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Janus n&#8217;a \u00e9t\u00e9 d\u00e9couvert qu&#8217;\u00e0 la fin de l\u2019ann\u00e9e 1966 par l&#8217;astronome fran\u00e7ais <a href=\"http:\/\/www.futura-sciences.com\/magazines\/espace\/infos\/actu\/d\/astronomie-dernier-vol-audouin-dollfus-25426\/\" target=\"_blank\">Audouin Dollfus<\/a> (1924-2010) en utilisant le t\u00e9lescope de 1m de l\u2019<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/03\/01\/en-video-lobservatoire-du-pic-du-midi-sous-la-neige\/\" target=\"_blank\">Observatoire du Pic du Midi<\/a> lors d\u2019un des rares passages de la Terre dans le plan des anneaux de Saturne : vus par la tranche, les anneaux disparaissent presque compl\u00e8tement \u00e0 cette \u00e9poque et les plus petits satellites comme Janus (une pomme de terre de 194\u00d7190\u00d7154 km) deviennent rep\u00e9rables.<!--more--><\/p>\n<p>La surface de Janus pr\u00e9sente de nombreux crat\u00e8res d\u2019impact dont certains atteignent 30 km de diam\u00e8tre. Ce bombardement m\u00e9t\u00e9oritique est \u00e0 l\u2019origine d\u2019un petit anneau de poussi\u00e8res autour de Janus qui a \u00e9t\u00e9 mis en \u00e9vidence par la sonde Cassini en 2006.<\/p>\n<p>Quant aux <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/07\/03\/linclinaison-des-anneaux-de-saturne-de-2004-a-2015\/\" target=\"_blank\">anneaux <\/a>(qui forment un disque de 140.000 km de diam\u00e8tre et qui ont \u00e9t\u00e9 vus pour la premi\u00e8re fois par <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/01\/06\/galilee-le-savant-qui-a-ouvert-nos-yeux-sur-lunivers\/\" target=\"_blank\">Galil\u00e9e <\/a>en 1610), ils sont constitu\u00e9s d&#8217;une multitude de particules de glace et de poussi\u00e8re dont la taille varie de quelques microm\u00e8tres \u00e0 quelques centaines de m\u00e8tres.<\/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>La sonde Cassini se trouvait \u00e0 un peu plus d&#8217;un million de km de Saturne quand elle a photographi\u00e9 les satellites Encelade et Janus. Cassini, la sonde am\u00e9ricaine qui a commenc\u00e9 \u00e0 explorer Saturne et sa banlieue en 2004, nous offre une nouvelle image de la plan\u00e8te aux anneaux et de deux de ses satellites, &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/04\/20\/encelade-janus-dessus-anneaux-de-saturne\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Encelade et Janus au-dessus des anneaux 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":5447,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[816,646,158,815,136,754,129],"class_list":["post-5446","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-audouin-dollfus","tag-encelade","tag-galilee","tag-janus","tag-saturne","tag-sonde-cassini","tag-william-herschel"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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