{"id":2387,"date":"2015-04-12T07:07:35","date_gmt":"2015-04-12T07:07:35","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=2387"},"modified":"2015-04-18T08:05:55","modified_gmt":"2015-04-18T08:05:55","slug":"des-croissants-de-lunes-autour-de-saturne","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/12\/des-croissants-de-lunes-autour-de-saturne\/","title":{"rendered":"Des croissants de lunes autour de Saturne"},"content":{"rendered":"

Il ne se passe pas une semaine sans que la mission Cassini-Huygens<\/a> ne nous envoie de nouvelles images de Saturne <\/a>et de ses lunes, et avouons qu’elles sont toujours aussi \u00e9tonnantes, plus d’une d\u00e9cennie apr\u00e8s la mise en orbite de la sonde Cassini autour de la plan\u00e8te g\u00e9ante aux anneaux.<\/span><\/span><\/span><\/p>\n

\"titan2\"<\/a><\/p>\n

En voici un nouvel exemple avec ce clich\u00e9 r\u00e9alis\u00e9 le 25 mars dernier et re\u00e7u sur Terre 4 jours plus tard. Il s’agit d’une image qui sera trait\u00e9e ult\u00e9rieurement par la NASA mais qui a d\u00e9j\u00e0 \u00e9t\u00e9 mise \u00e0 disposition du public sur le site de la mission et qui a \u00e9t\u00e9 coloris\u00e9e par Val Klavens<\/a>.<\/span><\/span><\/span><\/p>\n

<\/p>\n

Trois des satellites de Saturne se pr\u00e9sentent en croissant dans le champ de la cam\u00e9ra de l’orbiteur Cassini.<\/p>\n

Le plus imposant est Titan <\/a>(5150 km de diam\u00e8tre) qui fut d\u00e9couvert en 1655 par l’astronome Christian Huygens. Sur cette lune qui est entour\u00e9e d’une atmosph\u00e8re (constitu\u00e9e de diazote, de m\u00e9thane et d\u2019\u00e9thane), on a d\u00e9couvert de grands lacs d\u2019hydrocarbures (\u00e9thane et m\u00e9thane). Titan a re\u00e7u en janvier 2005 la visite de la sonde Huygens<\/a>.<\/span><\/p>\n

Le second croissant est celui de Rh\u00e9a, second satellite de Saturne en taille qui fut d\u00e9couvert par l’astronome Jean-Dominique Cassini en 1672.\u00a0Rh\u00e9a est un corps glac\u00e9 fortement crat\u00e9ris\u00e9. <\/span><\/p>\n

Le dernier (minuscule) croissant est celui de Mimas (d\u00e9couvert en 1789 par William Herschel<\/a>), un satellite pas tout \u00e0 fait rond de 382X418 km. Il est sans doute constitu\u00e9 principalement de glace d’eau comme le sugg\u00e8rent les mesures de densit\u00e9.<\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Il ne se passe pas une semaine sans que la mission Cassini-Huygens ne nous envoie de nouvelles images de Saturne et de ses lunes, et avouons qu’elles sont toujours aussi \u00e9tonnantes, plus d’une d\u00e9cennie apr\u00e8s la mise en orbite de la sonde Cassini autour de la plan\u00e8te g\u00e9ante aux anneaux. En voici un nouvel exemple … Continuer la lecture de Des croissants de lunes autour de Saturne<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":2373,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[569,621,939,570,486,938,136,567,937,129],"class_list":["post-2387","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-christian-huygens","tag-jean-dominique-cassini","tag-mimas","tag-mission-cassini-huygens","tag-nasa","tag-rhea","tag-saturne","tag-titan","tag-val-klavens","tag-william-herschel"],"yoast_head":"\nDes croissants de lunes autour de Saturne<\/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\/04\/12\/des-croissants-de-lunes-autour-de-saturne\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Des croissants de lunes autour de Saturne\" \/>\n<meta property=\"og:description\" content=\"Il ne se passe pas une semaine sans que la mission Cassini-Huygens ne nous envoie de nouvelles images de Saturne et de ses lunes, et avouons qu’elles sont toujours aussi \u00e9tonnantes, plus d’une d\u00e9cennie apr\u00e8s la mise en orbite de la sonde Cassini autour de la plan\u00e8te g\u00e9ante aux anneaux. 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