{"id":3020,"date":"2015-07-03T04:51:12","date_gmt":"2015-07-03T04:51:12","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=3020"},"modified":"2015-07-11T06:13:02","modified_gmt":"2015-07-11T06:13:02","slug":"linclinaison-des-anneaux-de-saturne-de-2004-a-2015","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/07\/03\/linclinaison-des-anneaux-de-saturne-de-2004-a-2015\/","title":{"rendered":"L’inclinaison des anneaux de Saturne de 2004 \u00e0 2015"},"content":{"rendered":"

L’astrophotographe Damian Peach a r\u00e9alis\u00e9 un montage avec ses superbes images de la plan\u00e8te Saturne. On peut ainsi mieux appr\u00e9cier les variations de l’inclinaison des anneaux.<\/strong><\/p>\n

Les anneaux de Saturne<\/a> ont \u00e9t\u00e9 observ\u00e9s pour la premi\u00e8re fois par Galil\u00e9e, mais c’est 45 ans plus tard, en 1655, que l’astronome hollandais Christian Huygens a compris leur v\u00e9ritable nature. Constitu\u00e9s d’innombrables particules de glace et de poussi\u00e8re, les anneaux ont une \u00e9paisseur de moins de 1 km et s’\u00e9tendent jusqu’\u00e0 300 000 km de Saturne<\/a>.<\/p>\n

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

Il faut presque 30 ans \u00e0 Saturne <\/a>pour r\u00e9aliser une orbite autour du Soleil\u00a0<\/a>; vus de notre observatoire mobile (la Terre), les anneaux nous apparaissent sous un angle variable.<\/p>\n

Nous d\u00e9couvrons alternativement l’h\u00e9misph\u00e8re nord pendant 15 ans et 9 mois (c’est le cas actuellement) puis l’h\u00e9misph\u00e8re sud\u00a0pendant 13 ans et 8 mois ( l’excentricit\u00e9 de l’orbite de Saturne explique la diff\u00e9rence de dur\u00e9e).<\/p>\n

Le montage photographique de Damian Peach<\/a> d\u00e9bute en haut \u00e0 gauche en 2004 et s’ach\u00e8ve en bas \u00e0 droite en 2015. En 2004 la face sud des anneaux est parfaitement visible, le maximum d’ouverture s’\u00e9tant produit l’ann\u00e9e pr\u00e9c\u00e9dente. L’inclinaison des anneaux n’a cess\u00e9 de diminuer jusqu’au mois de septembre 2009, p\u00e9riode pendant laquelle on voyait les anneaux par la tranche. Ensuite l’inclinaison des anneaux a repris dans l’autre sens, nous d\u00e9voilant leur face nord. L’ouverture des anneaux va se poursuivre jusqu’en 2017, puis va se remettre \u00e0 d\u00e9cro\u00eetre jusqu’au mois de mars 2025 o\u00f9 nous reverrons les anneaux par la tranche.<\/p>\n","protected":false},"excerpt":{"rendered":"

L’astrophotographe Damian Peach a r\u00e9alis\u00e9 un montage avec ses superbes images de la plan\u00e8te Saturne. On peut ainsi mieux appr\u00e9cier les variations de l’inclinaison des anneaux. Les anneaux de Saturne ont \u00e9t\u00e9 observ\u00e9s pour la premi\u00e8re fois par Galil\u00e9e, mais c’est 45 ans plus tard, en 1655, que l’astronome hollandais Christian Huygens a compris leur … Continuer la lecture de L’inclinaison des anneaux de Saturne de 2004 \u00e0 2015<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":3021,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[622,569,692,158,173,114,136],"class_list":["post-3020","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-anneau","tag-christian-huygens","tag-damian-peach","tag-galilee","tag-orbite","tag-planete","tag-saturne"],"yoast_head":"\nL'inclinaison des anneaux de Saturne de 2004 \u00e0 2015<\/title>\n<meta name=\"description\" content=\"L'astrophotographe Damian Peach a r\u00e9alis\u00e9 un 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