{"id":20082,"date":"2024-09-07T15:52:43","date_gmt":"2024-09-07T15:52:43","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=20082"},"modified":"2024-09-15T09:26:41","modified_gmt":"2024-09-15T09:26:41","slug":"spectacle-saturne-au-plus-pres-de-la-terre","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/09\/07\/spectacle-saturne-au-plus-pres-de-la-terre\/","title":{"rendered":"Spectacle : Saturne au plus pr\u00e8s de la Terre"},"content":{"rendered":"<p><strong>Au plus pr\u00e8s de la Terre le 8 septembre 2024, la plan\u00e8te Saturne nous offre le spectacle fascinant de ses anneaux. Un r\u00e9gal dans un t\u00e9lescope.<\/strong><\/p>\n<h5>Lointaine merveille :<\/h5>\n<p>Saturne est une plan\u00e8te g\u00e9ante gazeuse, la seconde apr\u00e8s\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/05\/18\/loccultation-de-jupiter-que-vous-navez-pas-vue\/\" target=\"_blank\" rel=\"noopener\">Jupiter<\/a>. Sa\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> apparente peut atteindre 0 lors de son opposition (elle est alors \u00e0 l\u2019oppos\u00e9 du Soleil, formant l\u2019alignement Soleil-Terre-Saturne). Pour cette opposition 2024, la <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/saturne-fin-mystere-anneaux-saturne-inclinaison-planete-geante-54956\/\" target=\"_blank\" rel=\"noopener\">sixi\u00e8me plan\u00e8te du Syst\u00e8me solaire<\/a> se situe \u00e0 un peu moins de 1,3 milliard de kilom\u00e8tres, dans la constellation du Verseau. Le diam\u00e8tre apparent du disque de la plan\u00e8te est de 19 secondes d&#8217;arc, port\u00e9 \u00e0 43 secondes d&#8217;arc pour la limite des anneaux :<\/p>\n<figure id=\"attachment_20084\" aria-describedby=\"caption-attachment-20084\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/saturne2.jpg\" rel=\"lightbox[20082]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-20084\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/saturne2-450x293.jpg\" alt=\"\" width=\"450\" height=\"293\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/saturne2-450x293.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/saturne2-1024x668.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/saturne2-768x501.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/saturne2.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-20084\" class=\"wp-caption-text\">Ce superbe clich\u00e9 a \u00e9t\u00e9 r\u00e9alis\u00e9 une dizaine de jours avant l&#8217;opposition. Outre les bandes gazeuses qui ceinturent le disque de la plan\u00e8te, on distingue \u00e9galement deux de ses nombreux satellites.\u00a0 \u00a9 <a href=\"https:\/\/www.astrobin.com\/users\/Simon74\/\" target=\"_blank\" rel=\"noopener\">Simon Laberg\u00e8re<\/a> et <a href=\"https:\/\/www.instagram.com\/theoginspector\/\" target=\"_blank\" rel=\"noopener\">Robin Le Guern<\/a><\/figcaption><\/figure>\n<p><!--more--><\/p>\n<h5>Le seigneur des anneaux :<\/h5>\n<p>En raison de son \u00e9clat et de son mouvement apparent, on peut penser que Saturne est observ\u00e9e depuis la pr\u00e9histoire. Mais c\u2019est au XVII\u00e8me si\u00e8cle que l\u2019on a d\u00e9couvert la particularit\u00e9 de cet astre. Lorsqu\u2019en 1610\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/01\/06\/galilee-le-savant-qui-a-ouvert-nos-yeux-sur-lunivers\/\" target=\"_blank\" rel=\"noopener\">Galil\u00e9e<\/a> pointe sa modeste longue-vue en direction de Saturne, il ne voit qu\u2019une paire d\u2019oreilles qui encadrent un minuscule globe. Il faut attendre les observations de Christian Huygens en 1656 (un an apr\u00e8s sa d\u00e9couverte du satellite\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/07\/19\/titan-et-encelade-deux-satellites-bien-differents\/\" target=\"_blank\" rel=\"noopener\">Titan<\/a>) pour comprendre qu\u2019un anneau entoure la plan\u00e8te. Vingt ans plus tard, Jean-Dominique Cassini r\u00e9v\u00e8le l\u2019existence de plusieurs anneaux.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/08\/sat_dessin1.jpg\" rel=\"lightbox[20082]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-18266\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/08\/sat_dessin1-450x450.jpg\" alt=\"\" width=\"450\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/08\/sat_dessin1-450x450.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/08\/sat_dessin1-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/08\/sat_dessin1-768x768.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/08\/sat_dessin1.jpg 900w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>On sait depuis la fin du XIX\u00e8me si\u00e8cle que ces anneaux sont compos\u00e9s d\u2019une multitude de particules, une th\u00e9orie du physicien \u00e9cossais James Clerk Maxwell \u00e9mise en 1859 et confirm\u00e9e par des mesures spectroscopiques en 1895.<\/p>\n<h5>Observez Saturne :<\/h5>\n<p>Sans un instrument d\u2019astronomie \u00e9quip\u00e9 d\u2019un syst\u00e8me de pointage automatique (Go-To), vous aurez peut-\u00eatre du mal \u00e0 trouver la plan\u00e8te. Vous pouvez alors utiliser une application comme <a href=\"https:\/\/stellarium.org\/fr\/\" target=\"_blank\" rel=\"noopener\">Stellarium<\/a> ou\u00a0la\u00a0<a href=\"https:\/\/www.stelvision.com\/astro\/carte-ciel\/\" target=\"_blank\" rel=\"noopener\">carte du ciel Stelvision<\/a>. Commencez vos observations avec une <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/10\/30\/ciel-aux-jumelles-guide-decouvrir-ciel-nocturne\/\" target=\"_blank\" rel=\"noopener\">paire de jumelles<\/a> : en les stabilisant (pos\u00e9es sur un pied photo), vous devriez apercevoir les anneaux sous la forme d\u2019un trait de part et d\u2019autre du globe. Pour vraiment les appr\u00e9cier, il faut un grossissement d\u2019une trentaine de fois. Une longue-vue d\u2019ornithologie vous fournira d\u00e9j\u00e0 d\u2019\u00e9tonnantes images, mais l\u2019id\u00e9al est de disposer d&#8217;un <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/01\/11\/peut-on-choisir-son-premier-telescope-sans-se-tromper\/\" target=\"_blank\" rel=\"noopener\">petit t\u00e9lescope<\/a>, \u00e9quip\u00e9 pourquoi pas d&#8217;une <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/09\/01\/tete-binoculaire-laccessoire-indispensable\/\" target=\"_blank\" rel=\"noopener\">t\u00eate binoculaire<\/a>.<\/p>\n<figure id=\"attachment_13180\" aria-describedby=\"caption-attachment-13180\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/12\/conj7.jpg\" rel=\"lightbox[20082]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-13180\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/12\/conj7-450x271.jpg\" alt=\"\" width=\"450\" height=\"271\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/12\/conj7-450x271.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/12\/conj7.jpg 700w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-13180\" class=\"wp-caption-text\">La Grande conjonction du 21 d\u00e9cembre 2020 : les plan\u00e8tes g\u00e9antes gazeuses Jupiter (la plus brillante) et Saturne \u00e9taient visibles c\u00f4te \u00e0 c\u00f4te. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>Il faut profiter de cet \u00e9t\u00e9 pour admirer <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/05\/22\/les-anneaux-de-saturne-se-referment-lentement\/\" target=\"_blank\" rel=\"noopener\">les anneaux qui se referment lentement<\/a>. En effet, apr\u00e8s avoir \u00e9t\u00e9 maximale (27 degr\u00e9s) en 2017, l\u2019inclinaison du plan des anneaux sera nulle l&#8217;an prochain. Le 23 mars 2025, la Terre passera dans le plan des anneaux qui deviendront alors invisibles pendant quelques semaines.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/09\/04\/comment-reussir-vos-photographies-planetaires\/\" target=\"_blank\" rel=\"noopener\">Comment r\u00e9ussir vos photographies plan\u00e9taires<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/05\/zoom-pole-nord-dencelade-satellite-de-saturne\/\" target=\"_blank\" rel=\"noopener\">Zoom sur le p\u00f4le nord d\u2019Encelade, satellite de Saturne<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/03\/04\/lumiere-cendree-dione-satellites-de-saturne\/\" target=\"_blank\" rel=\"noopener\">Lumi\u00e8re cendr\u00e9e sur Dion\u00e9, un des satellites de Saturne<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Au plus pr\u00e8s de la Terre le 8 septembre 2024, la plan\u00e8te Saturne nous offre le spectacle fascinant de ses anneaux. Un r\u00e9gal dans un t\u00e9lescope. Lointaine merveille : Saturne est une plan\u00e8te g\u00e9ante gazeuse, la seconde apr\u00e8s\u00a0Jupiter. Sa\u00a0magnitude apparente peut atteindre 0 lors de son opposition (elle est alors \u00e0 l\u2019oppos\u00e9 du Soleil, formant &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/09\/07\/spectacle-saturne-au-plus-pres-de-la-terre\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Spectacle : Saturne au plus pr\u00e8s de la Terre<\/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":20083,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[190,136],"class_list":["post-20082","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-opposition","tag-saturne"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Spectacle : Saturne au plus pr\u00e8s de la Terre<\/title>\n<meta name=\"description\" content=\"Au plus pr\u00e8s de la Terre le 8 septembre 2024, la plan\u00e8te Saturne nous offre le spectacle fascinant de ses anneaux. 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