{"id":8518,"date":"2018-01-11T16:47:09","date_gmt":"2018-01-11T16:47:09","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=8518"},"modified":"2018-01-25T19:42:03","modified_gmt":"2018-01-25T19:42:03","slug":"jeux-de-lunes-entre-anneaux-de-planete-saturne","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/01\/11\/jeux-de-lunes-entre-anneaux-de-planete-saturne\/","title":{"rendered":"Jeux de lunes entre les anneaux de la plan\u00e8te Saturne"},"content":{"rendered":"

Retour sur l’une des belles images de la banlieue de Saturne recueillies par la sonde Cassini, avec ce clich\u00e9 des satellites Dion\u00e9,\u00a0\u00c9pim\u00e9th\u00e9e et Prom\u00e9th\u00e9e.\u00a0<\/strong><\/p>\n

Le 15 septembre 2017, la sonde Cassini<\/a> effectuait un grand plongeon<\/a> dans les entrailles de Saturne, mettant fin \u00e0 plus d’une d\u00e9cennie d’exploration\u00a0de la plan\u00e8te gazeuse g\u00e9ante, de ses anneaux<\/a> et de ses principales lunes.\u00a0Arriv\u00e9e aux abords de Saturne en juin 2004, la sonde am\u00e9ricaine a r\u00e9alis\u00e9 une multitude d’observations \u00e0 l’aide de ses 12 instruments scientifiques et d’incroyables photographies.<\/p>\n

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

Cassini \u00e9tait l\u2019une des plus grosses sondes interplan\u00e9taires jamais construites : elle mesurait pr\u00e8s de 7 m\u00e8tres de haut pour 4 m\u00e8tres de largeur et pesait 2.150 kg sans compter les 350 kg du module\u00a0Huygens\u00a0<\/a>(largu\u00e9 sur\u00a0Titan\u00a0<\/a>le 14 janvier 2005)\u00a0et plus de 3 tonnes d\u2019hydrazine pour la propulsion.<\/p>\n

Ce clich\u00e9 a \u00e9t\u00e9 r\u00e9alis\u00e9 le 12 d\u00e9cembre 2011 \u00e0 l’occasion d’un passage rapproch\u00e9 \u00e0 environ 108.000 km de Dion\u00e9<\/a>, une lune de 1.123 km de diam\u00e8tre \u00e0 gauche de l’image d\u00e9couverte par l\u2019astronome Jean-Dominique Cassini en 1684. La surface de Dion\u00e9 pr\u00e9sente par endroits de grandes stries lumineuses<\/a>, des canyons d’origine tectonique.<\/p>\n

\u00c0 droite de Dion\u00e9, comme pos\u00e9 sur les anneaux vus par la tranche, Prom\u00e9th\u00e9e<\/a> est un petit satellite irr\u00e9gulier en forme de pomme de terre (119 km X 87 km X 61 km) d\u00e9couvert en octobre 1980 en examinant des photographies prises par la sonde\u00a0Voyager 1<\/em>. C’est un satellite berger de l\u2019anneau F dont il arrache de la mati\u00e8re chaque fois qu\u2019il s\u2019en approche.<\/p>\n

Beaucoup plus sombre,\u00a0\u00c9pim\u00e9th\u00e9e (113 km de diam\u00e8tre) a la particularit\u00e9 de partager la m\u00eame orbite que Janus<\/a> (ils proviennent peut-\u00eatre du m\u00eame astre qui se serait bris\u00e9 il y a tr\u00e8s longtemps). Tous les 4 ans les deux lunes se rapprochent\u00a0et d\u00e9calent leurs orbites en faisant demi-tour : la plus int\u00e9rieure devient alors la plus ext\u00e9rieure et inversement.<\/p>\n","protected":false},"excerpt":{"rendered":"

Retour sur l’une des belles images de la banlieue de Saturne recueillies par la sonde Cassini, avec ce clich\u00e9 des satellites Dion\u00e9,\u00a0\u00c9pim\u00e9th\u00e9e et Prom\u00e9th\u00e9e.\u00a0 Le 15 septembre 2017, la sonde Cassini effectuait un grand plongeon dans les entrailles de Saturne, mettant fin \u00e0 plus d’une d\u00e9cennie d’exploration\u00a0de la plan\u00e8te gazeuse g\u00e9ante, de ses anneaux et … Continuer la lecture de Jeux de lunes entre les anneaux de la plan\u00e8te Saturne<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":8519,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[1124,825,1704,136,754],"class_list":["post-8518","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-dione","tag-epimethee","tag-promethee","tag-saturne","tag-sonde-cassini"],"yoast_head":"\nJeux de lunes entre les anneaux de la plan\u00e8te Saturne<\/title>\n<meta name=\"description\" content=\"Retour sur l'une des belles images de la banlieue de Saturne recueillies par la sonde Cassini, avec ce clich\u00e9 des satellites Dion\u00e9,\u00a0\u00c9pim\u00e9th\u00e9e et Prom\u00e9th\u00e9e.\u00a0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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