{"id":16183,"date":"2022-07-14T13:59:34","date_gmt":"2022-07-14T13:59:34","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=16183"},"modified":"2022-07-26T16:03:02","modified_gmt":"2022-07-26T16:03:02","slug":"18-juillet-2022-rare-transit-du-satellite-japet-devant-saturne","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/07\/14\/18-juillet-2022-rare-transit-du-satellite-japet-devant-saturne\/","title":{"rendered":"Ne ratez pas le rare transit de Japet devant Saturne"},"content":{"rendered":"<p><strong>Le 18 juillet, les astronomes tenteront d&#8217;immortaliser un rare transit de Japet devant Saturne. Le prochain est pr\u00e9vu en 2052 seulement.\u00a0<\/strong><\/p>\n<h5>Une curieuse lune :<\/h5>\n<p>Japet est le troisi\u00e8me satellite de Saturne par la taille (apr\u00e8s <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/exobiologie-titan-lune-saturne-possede-molecule-encore-jamais-detectee-atmosphere-57365\/\" target=\"_blank\" rel=\"noopener\">Titan<\/a> et <a title=\"Des croissants de lunes autour de Saturne\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/12\/des-croissants-de-lunes-autour-de-saturne\/\" target=\"_blank\" rel=\"noopener\">Rh\u00e9a<\/a>). Il a \u00e9t\u00e9 d\u00e9couvert en 1671 par l\u2019astronome Jean-Dominique Cassini. Les mesures de densit\u00e9 indiquent que ce satellite est compos\u00e9 principalement de glace et d\u2019environ 20 % de mati\u00e8re rocheuse. Il a la particularit\u00e9 de pr\u00e9senter deux h\u00e9misph\u00e8res crat\u00e9ris\u00e9s de couleurs tr\u00e8s diff\u00e9rentes :<\/p>\n<figure id=\"attachment_2722\" aria-describedby=\"caption-attachment-2722\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/05\/japet_satellite_saturne.jpg\" rel=\"lightbox[16183]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-2722\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/05\/japet_satellite_saturne-450x338.jpg\" alt=\"\" width=\"450\" height=\"338\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/05\/japet_satellite_saturne-450x338.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/05\/japet_satellite_saturne.jpg 800w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-2722\" class=\"wp-caption-text\">Japet, un satellite noir et blanc qui gravite autour de Saturne. \u00a9 NASA<\/figcaption><\/figure>\n<p>Sa face avant (qui capture les poussi\u00e8res quand le satellite avance sur son orbite) est noire comme du charbon. Quant \u00e0 sa face arri\u00e8re, elle est blanche comme neige ! Autre curiosit\u00e9 : un bourrelet \u00e9quatorial, sorte de cr\u00eate montagneuse haute de 13 km et longue de 1.300 km. Ce bourrelet pourrait avoir \u00e9t\u00e9 form\u00e9 par la chute d\u2019un anneau de d\u00e9bris provenant d\u2019un petit satellite qui se serait bris\u00e9 :<\/p>\n<figure id=\"attachment_12155\" aria-describedby=\"caption-attachment-12155\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/06\/japet.jpg\" rel=\"lightbox[16183]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12155\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/06\/japet-450x269.jpg\" alt=\"\" width=\"450\" height=\"269\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/06\/japet-450x269.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/06\/japet-1024x613.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/06\/japet-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/06\/japet.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-12155\" class=\"wp-caption-text\">Toledo Montes est une \u00e9trange cr\u00eate \u00e9quatoriale qui court sur Japet.\u00a9 NASA<\/figcaption><\/figure>\n<p><!--more--><\/p>\n<h5>Un transit \u00e0 ne pas manquer :<\/h5>\n<p>Les transits de Japet sont des \u00e9v\u00e9nements rares. Le dernier s&#8217;est produit le 29 avril 2022, le pr\u00e9c\u00e9dent en 2007. Apr\u00e8s celui du 18 juillet 2022, il nous faudra attendre trente ans ! Ce 29 avril, quelques sp\u00e9cialistes de l&#8217;imagerie plan\u00e9taire comme <a href=\"https:\/\/www.facebook.com\/christopher.go.16\" target=\"_blank\" rel=\"noopener\">Christopher Go<\/a> avaient immortalis\u00e9 le spectacle :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/07\/japet2.jpg\" rel=\"lightbox[16183]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-16184\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/07\/japet2-450x229.jpg\" alt=\"\" width=\"450\" height=\"229\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/07\/japet2-450x229.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/07\/japet2-768x391.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/07\/japet2.jpg 800w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Le 18 juillet prochain, le transit se d\u00e9roulera en seconde partie de nuit. Pour relever ce d\u00e9fi, il faudra disposer d&#8217;un gros t\u00e9lescope parfaitement r\u00e9gl\u00e9 et d&#8217;excellentes conditions d&#8217;observations. La stabilit\u00e9 de l&#8217;atmosph\u00e8re sera primordiale pour pouvoir discerner le petit point sombre du satellite devant la plan\u00e8te gazeuse g\u00e9ante :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/07\/japet3.jpg\" rel=\"lightbox[16183]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-16187\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/07\/japet3-450x265.jpg\" alt=\"\" width=\"450\" height=\"265\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/07\/japet3-450x265.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/07\/japet3-768x453.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/07\/japet3.jpg 848w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/07\/japet4.jpg\" rel=\"lightbox[16183]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-16188\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/07\/japet4-450x252.jpg\" alt=\"\" width=\"450\" height=\"252\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/07\/japet4-450x252.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/07\/japet4-768x430.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/07\/japet4.jpg 887w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Merci \u00e0 l&#8217;astrophotographe <a href=\"https:\/\/www.facebook.com\/BernardBayl\" target=\"_blank\" rel=\"noopener\">Bernard Bayle<\/a> qui a r\u00e9alis\u00e9 pour Cielmania les simulations ci-dessus \u00e0 l&#8217;aide du logiciel <a href=\"http:\/\/jupos.org\/gh\/download.htm\" target=\"_blank\" rel=\"noopener\">WinJUPOS<\/a>.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/01\/11\/jeux-de-lunes-entre-anneaux-de-planete-saturne\/\" target=\"_blank\" rel=\"noopener\">Jeux de lunes entre les anneaux de la plan\u00e8te Saturne<\/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>\u00a0ou\u00a0<a href=\"https:\/\/twitter.com\/feldmann_jean\" 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 18 juillet, les astronomes tenteront d&#8217;immortaliser un rare transit de Japet devant Saturne. Le prochain est pr\u00e9vu en 2052 seulement.\u00a0 Une curieuse lune : Japet est le troisi\u00e8me satellite de Saturne par la taille (apr\u00e8s Titan et Rh\u00e9a). Il a \u00e9t\u00e9 d\u00e9couvert en 1671 par l\u2019astronome Jean-Dominique Cassini. Les mesures de densit\u00e9 indiquent que &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/07\/14\/18-juillet-2022-rare-transit-du-satellite-japet-devant-saturne\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Ne ratez pas le rare transit de Japet devant Saturne<\/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":16186,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[1017,136,828,3245],"class_list":["post-16183","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-japet","tag-saturne","tag-transit","tag-winjupos"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ne ratez pas le rare transit de Japet devant Saturne<\/title>\n<meta name=\"description\" content=\"Le 18 juillet, les astronomes tenteront d&#039;immortaliser un rare transit de Japet devant Saturne. 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