{"id":1825,"date":"2015-02-09T06:06:43","date_gmt":"2015-02-09T06:06:43","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1825"},"modified":"2016-05-10T14:32:32","modified_gmt":"2016-05-10T14:32:32","slug":"autour-de-saturne-des-anneaux-et-des-lunes","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/09\/autour-de-saturne-des-anneaux-et-des-lunes\/","title":{"rendered":"Autour de Saturne, des anneaux et des lunes"},"content":{"rendered":"

Bien que les quatre plan\u00e8tes gazeuses du Syst\u00e8me solaire soient entour\u00e9es d’anneaux, Saturne <\/a>nous offre les plus beaux, loin devant Jupiter<\/a>, Uranus <\/a>et Neptune. Il suffit pour s’en convaincre de plonger dans les archives de la mission Cassini-Huygens<\/a>.<\/p>\n

\"saturn1\"<\/a><\/p>\n

M\u00eame si elle date du 28 avril 2006, l’image ci-dessus \u00a0reste encore aujourd’hui l’une des plus belles photographies r\u00e9v\u00e9lant la beaut\u00e9 du monde de Saturne<\/a>.<\/p>\n

D\u00e9taillons cette image en partant du premier plan. Nous voyons d’abord un anneau tr\u00e8s fin (moins de 500 km de large), l’anneau F, qui est encadr\u00e9 par deux satellites bergers, Prom\u00e9th\u00e9e et Pandore (invisibles sur la photo).<\/p>\n

Vient ensuite l’anneau A, large de 15 000 km. La bande sombre qui le partage est la division de Encke, \u00e0 133 500 km du centre de Saturne<\/a>. Cette division (325 km de large) porte le nom de\u00a0l’astronome allemand \u00a0Johann Franz Encke (1791-1865). La division de Encke est produite par le petit satellite Pan (32 km de diam\u00e8tre) qui orbite \u00e0 l’int\u00e9rieur (invisible ici).<\/p>\n

\u00c9pim\u00e9th\u00e9e, un gros caillou de 110 km de diam\u00e8tre qui navigue \u00e0 151 000 km de Saturne, est visible sur l’image au-dessus du plan des anneaux.<\/p>\n

En arri\u00e8re-plan on peut enfin admirer Titan<\/a>, le plus grand satellite de Saturne (5150 km de diam\u00e8tre), lequel circule \u00e0 plus de 1,2 million de km de la plan\u00e8te gazeuse. Les contours flous de Titan <\/a>trahissent l’existence d’une atmosph\u00e8re compos\u00e9e de diazote, de m\u00e9thane et d’\u00e9thane.<\/p>\n

Quand elle a pris cette photographie, la sonde Cassini se trouvait \u00e0 une distance d’environ 667 000 km d’\u00c9pim\u00e9th\u00e9e \u00a0et 1 800 000 km de Titan. L’\u00e9chelle de l’image est de 4 km par pixel sur \u00c9pim\u00e9th\u00e9e et 11 km par pixel sur Titan.<\/p>\n","protected":false},"excerpt":{"rendered":"

Bien que les quatre plan\u00e8tes gazeuses du Syst\u00e8me solaire soient entour\u00e9es d’anneaux, Saturne nous offre les plus beaux, loin devant Jupiter, Uranus et Neptune. Il suffit pour s’en convaincre de plonger dans les archives de la mission Cassini-Huygens. M\u00eame si elle date du 28 avril 2006, l’image ci-dessus \u00a0reste encore aujourd’hui l’une des plus belles … Continuer la lecture de Autour de Saturne, des anneaux et des lunes<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":1826,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[622,826,825,827,568,136,567],"class_list":["post-1825","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-anneau","tag-division-de-encke","tag-epimethee","tag-johann-franz-encke","tag-satellite","tag-saturne","tag-titan"],"yoast_head":"\nAutour de Saturne, des anneaux et des lunes<\/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\/02\/09\/autour-de-saturne-des-anneaux-et-des-lunes\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Autour de Saturne, des anneaux et des lunes\" \/>\n<meta property=\"og:description\" content=\"Bien que les quatre plan\u00e8tes gazeuses du Syst\u00e8me solaire soient entour\u00e9es d’anneaux, Saturne nous offre les plus beaux, loin devant Jupiter, Uranus et Neptune. 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