{"id":14432,"date":"2021-08-12T14:31:30","date_gmt":"2021-08-12T14:31:30","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=14432"},"modified":"2021-08-16T09:48:26","modified_gmt":"2021-08-16T09:48:26","slug":"exceptionnel-transit-de-trois-satellites-devant-jupiter-le-15-aout-2021","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/08\/12\/exceptionnel-transit-de-trois-satellites-devant-jupiter-le-15-aout-2021\/","title":{"rendered":"Trois satellites vont transiter devant Jupiter le 15 ao\u00fbt"},"content":{"rendered":"<p><strong>Le ph\u00e9nom\u00e8ne est rare : le 15 ao\u00fbt 2021, certains observateurs bien situ\u00e9s pourront admirer un triple transit des satellites de Jupiter.<\/strong><\/p>\n<h5>Des satellites et des ombres :<\/h5>\n<p>Les astronomes parlent de transit lorsqu&#8217;un astre passe devant un autre. Si les deux objets c\u00e9lestes ont la m\u00eame taille apparente (cas du Soleil et de la Lune), on observe une <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/soleil-si-vous-avez-manque-eclipse-soleil-voici-plus-belles-photos-87864\/\" target=\"_blank\" rel=\"noopener\">\u00e9clipse<\/a>. Quatre petites lunes orbitent autour de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/07\/26\/en-video-lincroyable-survol-de-jupiter-et-ganymede-par-juno\/\" target=\"_blank\" rel=\"noopener\">Jupiter<\/a>. <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>, qui les a d\u00e9couvertes, a \u00e9t\u00e9 le premier observateur \u00e0 rep\u00e9rer leur ballet autour de la plan\u00e8te gazeuse g\u00e9ante. Le passage d&#8217;un satellite devant Jupiter est assez banal : rien qu&#8217;en 2021, il s&#8217;en produit plusieurs centaines ! Notez qu&#8217;il est plus facile d&#8217;observer avec un t\u00e9lescope le transit de l&#8217;ombre d&#8217;un satellite (tache noire sur fond clair) que le satellite lui-m\u00eame devant la plan\u00e8te.<\/p>\n<figure id=\"attachment_14207\" aria-describedby=\"caption-attachment-14207\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/jup2.jpg\" rel=\"lightbox[14432]\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-14207 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/jup2-450x250.jpg\" alt=\"\" width=\"450\" height=\"250\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/jup2-450x250.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/jup2-1024x569.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/jup2-768x427.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/jup2-672x372.jpg 672w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/jup2-1038x576.jpg 1038w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/jup2.jpg 1078w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-14207\" class=\"wp-caption-text\">Les ombres des satellites Ganym\u00e8de (\u00e0 gauche) et Io (juste \u00e0 c\u00f4t\u00e9 de Jupiter) se projettent sur la surface nuageuse de la plan\u00e8te gazeuse g\u00e9ante le 5 juin 2021. \u00a9 Quentin Gineys<\/figcaption><\/figure>\n<p>Observer deux transits est d\u00e9j\u00e0 moins courant. Le 5 juin dernier, l&#8217;astronome amateur <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/06\/07\/spectaculaire-jeu-dombres-de-deux-satellites-sur-jupiter\/\" target=\"_blank\" rel=\"noopener\">Quentin Gineys<\/a> avait pu immortaliser les ombres de Ganym\u00e8de et Io. Mais un triple transit est beaucoup plus rare : c&#8217;est ce que pourront admirer le 15 ao\u00fbt les observateurs situ\u00e9s en Asie et en Australie. <!--more--><\/p>\n<h5>M\u00e9canique c\u00e9leste :<\/h5>\n<p>En raison des forces de mar\u00e9es g\u00e9n\u00e9r\u00e9es par Jupiter, trois des lunes (<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/09\/23\/la-sonde-juno-immortalise-lombre-de-io-sur-jupiter\/\" target=\"_blank\" rel=\"noopener\">Io<\/a>, <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/05\/03\/satellite-europe-projette-ombre-jupiter\/\" target=\"_blank\" rel=\"noopener\">Europe<\/a> et <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/02\/07\/quand-ganymede-passe-derriere-jupiter\/\" target=\"_blank\" rel=\"noopener\">Ganym\u00e8de<\/a>) sont en r\u00e9sonnance. Quand Ganym\u00e8de fait un tour, Europe en fait deux et Io en fait quatre, comme nous le montre cette simulation :<\/p>\n<p><iframe loading=\"lazy\" title=\"Orbital Resonance of Jupiter&#039;s Moons - As a Beat\" width=\"474\" height=\"356\" src=\"https:\/\/www.youtube.com\/embed\/L3h_OIHU5pc?start=15&#038;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Mais la position de ces trois lunes sur leurs orbites exclut toute possibilit\u00e9 de les voir ensemble devant la plan\u00e8te gazeuse g\u00e9ante. Un triple transit implique donc n\u00e9cessairement <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/11\/30\/callisto-occulte-io\/\" target=\"_blank\" rel=\"noopener\">Callisto<\/a>, le plus \u00e9loign\u00e9 des quatre satellites galil\u00e9ens. Une configuration qui ne se reproduit pas souvent. La derni\u00e8re fois, c&#8217;\u00e9tait le 24 janvier 2015, et le t\u00e9lescope spatial Hubble avait immortalis\u00e9 l&#8217;\u00e9v\u00e9nement :<\/p>\n<figure id=\"attachment_14435\" aria-describedby=\"caption-attachment-14435\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/07\/hubble.jpg\" rel=\"lightbox[14432]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-14435\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/07\/hubble-450x225.jpg\" alt=\"\" width=\"450\" height=\"225\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/07\/hubble-450x225.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/07\/hubble-768x384.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/07\/hubble.jpg 972w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-14435\" class=\"wp-caption-text\">Transit des trois satellites galil\u00e9ens Callisto, Europe et Io le 24 janvier 2015. \u00a9 ESA\/NASA<\/figcaption><\/figure>\n<h5>D\u00e9fil\u00e9 de lunes :<\/h5>\n<p>Le 15 ao\u00fbt 2021, le spectacle se d\u00e9roulera peu apr\u00e8s 15 heures TU (<a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/sciences-temps-universel-4\/\" target=\"_blank\" rel=\"noopener\">Temps Universel<\/a>), il fera donc jour en France (il sera 17 heures \u00e0 Paris). \u00c0 ce moment-l\u00e0, les astronomes install\u00e9s en Australie et en Asie verront Io d&#8217;un c\u00f4t\u00e9 de Jupiter, Europe de l&#8217;autre, Callisto et Ganym\u00e8de devant. Puis, l&#8217;ombre d&#8217;Europe touchera la surface de la plan\u00e8te \u00e0 15 h 17. Peu apr\u00e8s, le satellite lui-m\u00eame se retrouvera devant Jupiter. Vers 15h42, Io dispara\u00eetra derri\u00e8re la g\u00e9ante gazeuse. Il n&#8217;y aura alors plus aucun satellite visible autour de la plan\u00e8te (trois seront devant et un derri\u00e8re).<\/p>\n<figure id=\"attachment_14539\" aria-describedby=\"caption-attachment-14539\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/08\/simul.jpg\" rel=\"lightbox[14432]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-14539\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/08\/simul-450x171.jpg\" alt=\"\" width=\"450\" height=\"171\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/08\/simul-450x171.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/08\/simul-1024x389.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/08\/simul-768x292.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/08\/simul.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-14539\" class=\"wp-caption-text\">Un simulateur permet de visualiser les d\u00e9placements des lunes de Jupiter. \u00a9 Shallowsky<\/figcaption><\/figure>\n<p>Cette \u00e9tonnante configuration (que l&#8217;on peut visualiser sur un simulateur comme <a href=\"https:\/\/shallowsky.com\/galilean\/\" target=\"_blank\" rel=\"noopener\"><em>Shallowsky<\/em><\/a>) durera une douzaine de minutes, avant que Callisto ne termine son transit.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/09\/23\/la-sonde-juno-immortalise-lombre-de-io-sur-jupiter\/\" target=\"_blank\" rel=\"noopener\">La sonde Juno immortalise l\u2019ombre de Io sur Jupiter<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/11\/08\/saisissante-image-des-deux-anticyclones-geants-de-jupiter\/\" target=\"_blank\" rel=\"noopener\">Saisissante image des deux anticyclones g\u00e9ants de Jupiter<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/03\/07\/io-une-lune-volcanique-tres-active-autour-de-jupiter\/\" target=\"_blank\" rel=\"noopener\">Io, une lune volcanique tr\u00e8s active autour de Jupiter<\/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>\u00a0ou\u00a0<a href=\"https:\/\/twitter.com\/cielmania\" target=\"_blank\" rel=\"noopener noreferrer\">Twitter<\/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 ph\u00e9nom\u00e8ne est rare : le 15 ao\u00fbt 2021, certains observateurs bien situ\u00e9s pourront admirer un triple transit des satellites de Jupiter. Des satellites et des ombres : Les astronomes parlent de transit lorsqu&#8217;un astre passe devant un autre. Si les deux objets c\u00e9lestes ont la m\u00eame taille apparente (cas du Soleil et de la &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/08\/12\/exceptionnel-transit-de-trois-satellites-devant-jupiter-le-15-aout-2021\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Trois satellites vont transiter devant Jupiter le 15 ao\u00fbt<\/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":14433,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[415,412,158,414,413,90,828],"class_list":["post-14432","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-callisto","tag-europe","tag-galilee","tag-ganymede","tag-io","tag-jupiter","tag-transit"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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