{"id":6488,"date":"2016-11-03T13:27:33","date_gmt":"2016-11-03T13:27:33","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=6488"},"modified":"2016-11-15T16:58:52","modified_gmt":"2016-11-15T16:58:52","slug":"lombre-satellite-pan-anneaux-de-saturne","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/11\/03\/lombre-satellite-pan-anneaux-de-saturne\/","title":{"rendered":"L’ombre du satellite Pan sur les anneaux de Saturne"},"content":{"rendered":"

Pan, l’un des nombreux satellites de Saturne, circule dans la division d’Encke, un couloir \u00e0 l’int\u00e9rieur de l’anneau A sur lequel il projette son ombre.<\/strong><\/p>\n

Depuis 2004 la sonde Cassini<\/a>, l\u2019une des plus grosses sondes interplan\u00e9taires jamais construites, nous fait d\u00e9couvrir Saturne<\/a>, ses lunes et ses anneaux. Aujourd’hui voici Pan, un satellite d’un peu moins de 30 km de diam\u00e8tre d\u00e9couvert en juillet 1990 par l’astronome am\u00e9ricain\u00a0Mark Robert Showalter sur des images acquises par la sonde Voyager 2<\/em><\/a> lors de son survol de Saturne 9 ans plus t\u00f4t.<\/p>\n

\"pan2\"<\/a><\/p>\n

Pan (qui orbite \u00e0 un peu plus de 133.000 km du centre de Saturne) \u00a0est observable \u00e0 l’int\u00e9rieur de la division d’Encke (nomm\u00e9e\u00a0en hommage \u00e0 l’astronome allemand Johann Franz Encke), un espace vide de 325 km de large \u00e0 l’int\u00e9rieur de l’anneau A, le plus externe des deux anneaux les plus brillants de la plan\u00e8te.<\/p>\n

Pan y joue le r\u00f4le de satellite berger en ratissant tout ce qui se trouve dans la division d’Encke dont il assure l’existence.<\/p>\n

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

Les petits satellites de Saturne comme Pan (mais \u00e9galement Atlas, Prom\u00e9th\u00e9e<\/a>, \u00c9pim\u00e9th\u00e9e, Pandore et Janus pour ne citer que les plus importants) ne sont pas n\u00e9s comme les autres satellites au d\u00e9but de la formation du Syst\u00e8me solaire, mais sont beaucoup plus jeunes (ils nous montrent des surfaces glac\u00e9es brillantes qui n’ont pas \u00e9t\u00e9 alt\u00e9r\u00e9es par plusieurs milliards d’ann\u00e9es de bombardement m\u00e9t\u00e9oritique).<\/p>\n

Des simulations num\u00e9riques ont montr\u00e9 que ces jeunes lunes se sont form\u00e9es en quelques dizaines de millions d’ann\u00e9es seulement. Dans une zone situ\u00e9e au-del\u00e0 de la limite de Roche, \u00e0 une distance o\u00f9 l’action gravitationnelle de Saturne n’est plus assez forte, les particules glac\u00e9es qui constituent les anneaux ont alors tendance \u00e0 se regrouper en agr\u00e9gats.<\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Pan, l’un des nombreux satellites de Saturne, circule dans la division d’Encke, un couloir \u00e0 l’int\u00e9rieur de l’anneau A sur lequel il projette son ombre. Depuis 2004 la sonde Cassini, l\u2019une des plus grosses sondes interplan\u00e9taires jamais construites, nous fait d\u00e9couvrir Saturne, ses lunes et ses anneaux. Aujourd’hui voici Pan, un satellite d’un peu moins … Continuer la lecture de L’ombre du satellite Pan sur les anneaux de Saturne<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":6489,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[1870,1869,827,1872,1871,1868,136],"class_list":["post-6488","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-anneau-a","tag-division-dencke","tag-johann-franz-encke","tag-limite-de-roche","tag-mark-robert-showalter","tag-pan","tag-saturne"],"yoast_head":"\nL'ombre du satellite Pan sur les anneaux de Saturne<\/title>\n<meta name=\"description\" content=\"Pan, l'un des nombreux satellites de Saturne, circule dans la division d'Encke, un couloir \u00e0 l'int\u00e9rieur de l'anneau A sur lequel il projette son ombre.\" \/>\n<meta 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