{"id":7234,"date":"2017-03-04T10:02:38","date_gmt":"2017-03-04T10:02:38","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7234"},"modified":"2017-03-09T18:58:29","modified_gmt":"2017-03-09T18:58:29","slug":"lumiere-cendree-dione-satellites-de-saturne","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/03\/04\/lumiere-cendree-dione-satellites-de-saturne\/","title":{"rendered":"Lumi\u00e8re cendr\u00e9e sur Dion\u00e9, un des satellites de Saturne"},"content":{"rendered":"

Nous pouvons r\u00e9guli\u00e8rement admirer la lumi\u00e8re cendr\u00e9e sur la Lune. Le m\u00eame ph\u00e9nom\u00e8ne a \u00e9t\u00e9 photographi\u00e9 sur le satellite Dion\u00e9 dans la banlieue de Saturne.<\/strong><\/p>\n

La sonde am\u00e9ricaine\u00a0Cassini<\/a>\u00a0explore Saturne <\/a>et sa banlieue depuis 2004. Elle a eu plusieurs fois l’occasion de s’approcher de Dion\u00e9,\u00a0\u00a0un satellite de 1.100 kilom\u00e8tres de diam\u00e8tre qui a \u00e9t\u00e9 d\u00e9couvert par l\u2019astronome Jean-Dominique Cassini en 1684.<\/p>\n

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

Sur cette image<\/a> r\u00e9alis\u00e9e\u00a0le 23 octobre 2016 \u00e0 une distance d’environ 504.000 km nous sommes tr\u00e8s loin des records de d\u00e9cembre 2011 (survol \u00e0 100 km de distance) ou m\u00eame de juin 2015 (500 km entre la sonde et le satellite).<\/p>\n

Mais le charme de cette photographie r\u00e9side dans la lumi\u00e8re cendr\u00e9e<\/a> qui accompagne le croissant de Dion\u00e9. Si la Lune<\/a> doit sa lumi\u00e8re cendr\u00e9e aux rayons solaires renvoy\u00e9s dans l’espace par la Terre (d’o\u00f9 son nom de clair de Terre), c’est Saturne qui assure ici le r\u00f4le de “miroir”.<\/p>\n

Principalement compos\u00e9 d\u2019eau sous forme de glace, Dion\u00e9 est un satellite qui intrigue les plan\u00e9tologues en raison de grandes\u00a0stries lumineuses<\/a> qui griffent par endroit sa surface.<\/p>\n

Lorsqu\u2019on les a observ\u00e9es pour la premi\u00e8re fois avec les sondes Voyager<\/em> dans les ann\u00e9es 1980, on a d\u2019abord pens\u00e9 que ces stries \u00e9taient le r\u00e9sultat d\u2019un 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\u2019hypoth\u00e8se d\u2019une activit\u00e9 tectonique \u00e0 l\u2019origine de ces grandes failles aux parois lumineuses. En avril 2010\u00a0le spectrom\u00e8tre \u00e0 plasma Caps<\/em> (pour CAssini Plasma Spectrometer<\/em>) avait en outre d\u00e9tect\u00e9 la pr\u00e9sence de mol\u00e9cules d\u2019oxyg\u00e8ne dans la fine atmosph\u00e8re de Dion\u00e9.<\/p>\n","protected":false},"excerpt":{"rendered":"

Nous pouvons r\u00e9guli\u00e8rement admirer la lumi\u00e8re cendr\u00e9e sur la Lune. Le m\u00eame ph\u00e9nom\u00e8ne a \u00e9t\u00e9 photographi\u00e9 sur le satellite Dion\u00e9 dans la banlieue de Saturne. La sonde am\u00e9ricaine\u00a0Cassini\u00a0explore Saturne et sa banlieue depuis 2004. Elle a eu plusieurs fois l’occasion de s’approcher de Dion\u00e9,\u00a0\u00a0un satellite de 1.100 kilom\u00e8tres de diam\u00e8tre qui a \u00e9t\u00e9 d\u00e9couvert par … Continuer la lecture de Lumi\u00e8re cendr\u00e9e sur Dion\u00e9, un des satellites de Saturne<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":7463,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[1124,88,82,136,754],"class_list":["post-7234","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-dione","tag-lumiere-cendree","tag-lune","tag-saturne","tag-sonde-cassini"],"yoast_head":"\nLumi\u00e8re cendr\u00e9e sur Dion\u00e9, un des satellites de Saturne<\/title>\n<meta name=\"description\" content=\"Nous pouvons r\u00e9guli\u00e8rement admirer la lumi\u00e8re cendr\u00e9e sur la Lune. 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