{"id":5981,"date":"2016-07-21T06:36:29","date_gmt":"2016-07-21T06:36:29","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=5981"},"modified":"2016-07-29T06:19:23","modified_gmt":"2016-07-29T06:19:23","slug":"cinq-satellites-de-saturne-devant-sonde-cassini","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/07\/21\/cinq-satellites-de-saturne-devant-sonde-cassini\/","title":{"rendered":"Cinq satellites de Saturne devant la sonde Cassini"},"content":{"rendered":"<p><strong>La sonde am\u00e9ricaine Cassini a r\u00e9ussi \u00e0 photographier ensemble cinq des soixante-deux satellites de Saturne :\u00a0Janus, Pandore, Encelade, Mimas et Rh\u00e9a.<\/strong><\/p>\n<p>Depuis 2004 la sonde Cassini, l\u2019une des plus grosses sondes interplan\u00e9taires jamais construites, nous fait d\u00e9couvrir <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/06\/01\/admirez-planete-saturne-plus-pres-de-terre\/\" target=\"_blank\">Saturne <\/a>et ses lunes.\u00a0Se plonger dans les archives de la mission est toujours un bonheur, comme le prouve cette image r\u00e9alis\u00e9e le 29 juillet 2011.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/satellites_saturne.jpg\" rel=\"lightbox[5981]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-5982\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/satellites_saturne-450x319.jpg\" alt=\"satellites_saturne\" width=\"450\" height=\"319\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/satellites_saturne-450x319.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/satellites_saturne-768x544.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/satellites_saturne-1024x725.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/satellites_saturne.jpg 1271w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>L&#8217;exploration des soixante-deux satellites de Saturne ne cesse de nous \u00e9tonner, voire de nous ravir. Il y a bien s\u00fbr <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/11\/29\/iles-mysterieuses-titan\/\" target=\"_blank\">Titan<\/a>, sur lequel s&#8217;est pos\u00e9 le\u00a0module <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/01\/17\/huygens-sur-titan-cetait-il-y-10-ans\/\" target=\"_blank\">Huygens <\/a>le 14 janvier 2005, nous r\u00e9v\u00e9lant un \u00e9trange paysage glac\u00e9 dans lequel s&#8217;\u00e9talent des lacs de m\u00e9thane et d\u2019\u00e9thane liquide.\u00a0<!--more--><\/p>\n<p>Pour les autres, des dizaines de lunes glac\u00e9es, c&#8217;est la cam\u00e9ra de Cassini qui nous a montr\u00e9 leur infinie vari\u00e9t\u00e9 de forme, de taille et d&#8217;origine. Certains de ces mondes ont des surfaces rugueuses, dures, tandis que d&#8217;autres sont des corps poreux recouverts d&#8217;une fine couverture de particules glac\u00e9es. Tous sont plus ou moins crat\u00e9ris\u00e9s et beaucoup poss\u00e8dent des montagnes et des vall\u00e9es.<\/p>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/03\/les-crateres-du-satellite-janus-vus-par-la-sonde-cassini\/\" target=\"_blank\">Janus<\/a>, qui \u00a0partage pratiquement la m\u00eame orbite que \u00c9pim\u00e9th\u00e9e, a \u00e9t\u00e9 d\u00e9couvert le 15 d\u00e9cembre 1966 par <a href=\"http:\/\/www.futura-sciences.com\/magazines\/espace\/infos\/actu\/d\/astronomie-dernier-vol-audouin-dollfus-25426\/\" target=\"_blank\">Audouin Dollfus<\/a>. Il mesure 194 X 190 X 154 km et sa surface est cribl\u00e9e de crat\u00e8res.<\/li>\n<li>Pandore, un autre petit satellite irr\u00e9gulier (103 X 79 X 64 km) d\u00e9couvert en 1980 sur des images prises par la sonde <em>Voyager 1<\/em>, est un satellite berger de l&#8217;anneau F tout comme Prom\u00e9th\u00e9e.<\/li>\n<li>D\u00e9couvert en 1789 par <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/12\/telescope-william-herschel\/\" target=\"_blank\">William Herschel<\/a>,\u00a0<a style=\"line-height: 1.5\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/10\/18\/gros-plan-sur-la-banquise-dencelade-satellite-de-saturne\/\" target=\"_blank\">Encelade <\/a><span style=\"line-height: 1.5\">(500 km de diam\u00e8tre) est recouvert d&#8217;une cro\u00fbte glac\u00e9e de 30 \u00e0 40 km d&#8217;\u00e9paisseur d&#8217;o\u00f9 s&#8217;\u00e9chappent des geysers remontant d&#8217;un oc\u00e9an souterrain.<\/span><\/li>\n<li>Mimas (d\u00e9couvert \u00e9galement par William Herschel en 1789) n&#8217;est pas un satellite tout \u00e0 fait rond (382 X 418 km). Il est sans doute constitu\u00e9 principalement de glace d\u2019eau comme le sugg\u00e8rent les mesures de densit\u00e9.<\/li>\n<li>Quant \u00e0 Rh\u00e9a, un corps glac\u00e9 fortement crat\u00e9ris\u00e9, c&#8217;est le second satellite de Saturne en taille (un peu plus de 1.500 km de diam\u00e8tre). Il fut d\u00e9couvert par l\u2019astronome Jean-Dominique Cassini en 1672.<\/li>\n<\/ul>\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 am\u00e9ricaine Cassini a r\u00e9ussi \u00e0 photographier ensemble cinq des soixante-deux satellites de Saturne :\u00a0Janus, Pandore, Encelade, Mimas et Rh\u00e9a. Depuis 2004 la sonde Cassini, l\u2019une des plus grosses sondes interplan\u00e9taires jamais construites, nous fait d\u00e9couvrir Saturne et ses lunes.\u00a0Se plonger dans les archives de la mission est toujours un bonheur, comme le prouve &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/07\/21\/cinq-satellites-de-saturne-devant-sonde-cassini\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Cinq satellites de Saturne devant la sonde Cassini<\/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":5982,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[646,815,939,1716,938,136,754],"class_list":["post-5981","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-encelade","tag-janus","tag-mimas","tag-pandore","tag-rhea","tag-saturne","tag-sonde-cassini"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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