{"id":3081,"date":"2015-06-26T04:48:40","date_gmt":"2015-06-26T04:48:40","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=3081"},"modified":"2015-07-03T04:52:03","modified_gmt":"2015-07-03T04:52:03","slug":"la-sonde-cassini-survole-dione-un-des-satellites-de-saturne","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/06\/26\/la-sonde-cassini-survole-dione-un-des-satellites-de-saturne\/","title":{"rendered":"La sonde Cassini survole Dion\u00e9, un des satellites de Saturne"},"content":{"rendered":"

Le 16 juin la sonde Cassini est pass\u00e9e \u00e0 un peu plus de 500 kilom\u00e8tres de Dion\u00e9, l’une des nombreuses lunes de la plan\u00e8te Saturne.<\/strong><\/p>\n

Apr\u00e8s Hyp\u00e9rion<\/a> le 29 mai dernier, c’est au tour de Dion\u00e9 de recevoir la visite de Cassini<\/a>, la sonde am\u00e9ricaine qui explore Saturne <\/a>et sa banlieue depuis 2004.<\/p>\n

\"dione_1\"<\/a><\/p>\n

Dion\u00e9 <\/a>est un satellite de 1100 kilom\u00e8tres de diam\u00e8tre qui a \u00e9t\u00e9 d\u00e9couvert par l’astronome Jean-Dominique Cassini en 1684.<\/p>\n

Principalement compos\u00e9e d’eau sous forme de glace, cette lune, dont la surface est tr\u00e8s crat\u00e9ris\u00e9e, a d\u00e9j\u00e0 \u00e9t\u00e9 survol\u00e9e \u00e0 quatre reprises par la sonde avec un passage \u00e0 seulement 100 kilom\u00e8tres en d\u00e9cembre 2011.<\/p>\n

En avril 2010\u00a0le spectrom\u00e8tre \u00e0 plasma Caps (pour CAssini Plasma Spectrometer<\/em>) avait d\u00e9tect\u00e9 la pr\u00e9sence de mol\u00e9cules d’oxyg\u00e8ne dans la fine atmosph\u00e8re de Dion\u00e9.<\/p>\n

\"dione2\"<\/a><\/p>\n

Les plan\u00e9tologues ont profit\u00e9 de ces diff\u00e9rents survols pour tenter d’en savoir un peu plus sur les stries lumineuses<\/a> qui griffent par endroit la surface du satellite.<\/p>\n

Lorsqu’on les a observ\u00e9es pour la premi\u00e8re fois avec les sondes Voyager dans les ann\u00e9es 1980, on a d’abord pens\u00e9 que ces stries \u00e9taient le r\u00e9sultat d’un processus de cryovolcanisme (comme pour les volcans de glace). La sonde Cassini a fourni depuis des images avec une bien meilleure r\u00e9solution qui ont accr\u00e9dit\u00e9 l’hypoth\u00e8se d’une activit\u00e9 tectonique \u00e0 l’origine de ces grandes failles aux parois lumineuses.<\/p>\n

Cassini survolera une derni\u00e8re fois Dion\u00e9 le 17 ao\u00fbt prochain avant de se diriger une nouvelle fois vers Encelade.<\/p>\n","protected":false},"excerpt":{"rendered":"

Le 16 juin la sonde Cassini est pass\u00e9e \u00e0 un peu plus de 500 kilom\u00e8tres de Dion\u00e9, l’une des nombreuses lunes de la plan\u00e8te Saturne. Apr\u00e8s Hyp\u00e9rion le 29 mai dernier, c’est au tour de Dion\u00e9 de recevoir la visite de Cassini, la sonde am\u00e9ricaine qui explore Saturne et sa banlieue depuis 2004. Dion\u00e9 est … Continuer la lecture de La sonde Cassini survole Dion\u00e9, un des satellites de Saturne<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":3084,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[1124,621,114,136,754],"class_list":["post-3081","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-dione","tag-jean-dominique-cassini","tag-planete","tag-saturne","tag-sonde-cassini"],"yoast_head":"\nLa sonde Cassini survole Dion\u00e9, un des satellites de Saturne<\/title>\n<meta name=\"description\" content=\"Le 16 juin la sonde Cassini est pass\u00e9e \u00e0 un peu plus de 500 kilom\u00e8tres de Dion\u00e9, l'une des nombreuses lunes de la plan\u00e8te Saturne.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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