{"id":21614,"date":"2025-09-19T15:20:07","date_gmt":"2025-09-19T15:20:07","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=21614"},"modified":"2025-10-06T16:57:13","modified_gmt":"2025-10-06T16:57:13","slug":"ce-weekend-saturne-est-au-plus-pres-de-la-terre","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/09\/19\/ce-weekend-saturne-est-au-plus-pres-de-la-terre\/","title":{"rendered":"Ce weekend, Saturne est au plus pr\u00e8s de la Terre !"},"content":{"rendered":"<p><strong>Le 21 septembre 2025, Saturne est \u00e0 sa plus courte distance de la Terre. Voici quelques conseils pour bien profiter de ce spectacle.\u00a0<\/strong><\/p>\n<h5>Une plan\u00e8te qui fait r\u00eaver :<\/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>\u00a0apparente peut atteindre 0 lors de son opposition (elle est alors \u00e0 l\u2019oppos\u00e9 du <a href=\"https:\/\/cnes.fr\/dossiers\/soleil\" target=\"_blank\" rel=\"noopener\">Soleil<\/a>, formant l\u2019alignement Soleil-Terre-Saturne). Pour cette opposition 2025, 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. Le diam\u00e8tre apparent du disque de la plan\u00e8te est de 19,5 secondes d\u2019arc, port\u00e9 \u00e0 44 secondes d\u2019arc 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[21614]\"><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 durant l\u2019opposition 2024. Outre les c\u00e9l\u00e8bres anneaux et 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>\u00a0et\u00a0<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>\u00a0pointe 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 <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Christian_Huygens\" target=\"_blank\" rel=\"noopener\">Christian Huygens<\/a> 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, <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Jean-Dominique_Cassini\" target=\"_blank\" rel=\"noopener\">Jean-Dominique Cassini<\/a> r\u00e9v\u00e8le l\u2019existence de plusieurs anneaux :<\/p>\n<figure id=\"attachment_20094\" aria-describedby=\"caption-attachment-20094\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/saturne.jpg\" rel=\"lightbox[21614]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-20094\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/saturne-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/saturne-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/saturne-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/saturne-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/saturne.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-20094\" class=\"wp-caption-text\">En photographiant la plan\u00e8te avec un petit t\u00e9lescope pendant une d\u00e9cennie, on constate l&#8217;\u00e9volution de son orientation qui modifie l&#8217;ouverture des anneaux. \u00a9 <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/09\/13\/saturne-dix-ans-dimagerie-depuis-un-balcon-lyonnais\/\" target=\"_blank\" rel=\"noopener\">Lionnel Guyonnet<\/a><\/figcaption><\/figure>\n<p>On sait que ces anneaux sont compos\u00e9s d\u2019une multitude de particules, une id\u00e9e \u00e9mise par le physicien \u00e9cossais <a href=\"https:\/\/fr.wikipedia.org\/wiki\/James_Clerk_Maxwell\" target=\"_blank\" rel=\"noopener\">James Clerk Maxwell<\/a> en 1859.<\/p>\n<h5>Comment observer Saturne :<\/h5>\n<p>Vous aurez peut-\u00eatre du mal \u00e0 trouver la plan\u00e8te, situ\u00e9e dans la modeste <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Poissons_(constellation)\" target=\"_blank\" rel=\"noopener\">constellation des Poissons<\/a>. Utilisez alors une application comme <a href=\"https:\/\/stellarium.org\/fr\/\" target=\"_blank\" rel=\"noopener\">Stellarium<\/a>\u00a0ou\u00a0la\u00a0<a href=\"https:\/\/www.stelvision.com\/astro\/carte-ciel\/\" target=\"_blank\" rel=\"noopener\">carte du ciel Stelvision<\/a>. Tout d&#8217;abord, 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> .<\/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[21614]\"><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\u00a02020 : 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>Tenues fermement, elles devraient vous permettre d&#8217;apercevoir les anneaux sous la forme d\u2019un trait de part et d\u2019autre du globe. Pour vraiment les appr\u00e9cier, il faut le grossissement qu&#8217;offre une longue-vue d\u2019ornithologie. Mais bien s\u00fbr, l\u2019id\u00e9al reste 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\u2019une\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/09\/01\/tete-binoculaire-laccessoire-indispensable\/\" target=\"_blank\" rel=\"noopener\">t\u00eate binoculaire<\/a>. Et si vous souhaitez immortaliser cet astre, lisez <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>.<\/p>\n<h5>Derni\u00e8res nouvelles de la plan\u00e8te :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/08\/24\/saturne-une-tempete-polygonale-au-pole-sud\/\" target=\"_blank\" rel=\"noopener\">D\u00e9couverte d&#8217;une temp\u00eate polygonale au p\u00f4le Sud de Saturne<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/03\/12\/saturne-compte-desormais-274-lunes\/\" target=\"_blank\" rel=\"noopener\">Saturne compte d\u00e9sormais 274 lunes<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/09\/06\/spectacle-rare-deux-lunes-projettent-leur-ombre-sur-saturne\/\" target=\"_blank\" rel=\"noopener\">Les lunes Titan, T\u00e9thys et leurs ombres sur la plan\u00e8te<\/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>\u00a0et sur\u00a0<a href=\"https:\/\/bsky.app\/profile\/cielmania.bsky.social\" target=\"_blank\" rel=\"noopener\">Bluesky<\/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>Le 21 septembre 2025, Saturne est \u00e0 sa plus courte distance de la Terre. Voici quelques conseils pour bien profiter de ce spectacle.\u00a0 Une plan\u00e8te qui fait r\u00eaver : Saturne est une plan\u00e8te g\u00e9ante gazeuse, la seconde apr\u00e8s\u00a0Jupiter. Sa\u00a0magnitude\u00a0apparente peut atteindre 0 lors de son opposition (elle est alors \u00e0 l\u2019oppos\u00e9 du Soleil, formant l\u2019alignement &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/09\/19\/ce-weekend-saturne-est-au-plus-pres-de-la-terre\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Ce weekend, Saturne est 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":19565,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[3825,190,136],"class_list":["post-21614","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-21-septembre-2025","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>Ce weekend, Saturne est au plus pr\u00e8s de la Terre !<\/title>\n<meta name=\"description\" content=\"Le 21 septembre 2025, Saturne est \u00e0 sa plus courte distance de la Terre. 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