{"id":15895,"date":"2022-05-04T09:40:49","date_gmt":"2022-05-04T09:40:49","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=15895"},"modified":"2022-05-18T10:05:45","modified_gmt":"2022-05-18T10:05:45","slug":"mercure-devoile-son-impressionnante-queue-de-sodium","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/05\/04\/mercure-devoile-son-impressionnante-queue-de-sodium\/","title":{"rendered":"La plan\u00e8te Mercure d\u00e9voile son \u00e9tonnante queue de sodium"},"content":{"rendered":"<p><strong>C&#8217;est un ph\u00e9nom\u00e8ne astronomique connu depuis seulement vingt ans : la plan\u00e8te Mercure poss\u00e8de une gigantesque queue de sodium.<\/strong><\/p>\n<h5>Aspect com\u00e9taire :<\/h5>\n<p>Non, vous vous trompez, ce que vous voyez n&#8217;est pas une com\u00e8te ! L&#8217;\u00e9tonnante photographie r\u00e9alis\u00e9e par Daniel Lopez (<a href=\"http:\/\/www.elcielodecanarias.com\/portfolio-daniel-lopez-eng\/\" target=\"_blank\" rel=\"noopener\"><em>El Cielo De Canarias<\/em><\/a>) le 2 mai 2022 depuis l&#8217;archipel des Canaries nous montre en r\u00e9alit\u00e9 la queue de sodium de <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/soleil-mercure-monde-extremes-91696\/\" target=\"_blank\" rel=\"noopener\">Mercure<\/a>. Au cours de cette soir\u00e9e, la plan\u00e8te la plus proche du <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/05\/02\/au-chili-leclipse-de-soleil-sest-terminee-dans-locean\/\" target=\"_blank\" rel=\"noopener\">Soleil<\/a> avait rendez-vous avec d&#8217;autres astres. Elle \u00e9tait observable entre le croissant de Lune (accompagn\u00e9 de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/07\/02\/la-lumiere-cendree-joyau-de-chaque-nouvelle-lunaison\/\" target=\"_blank\" rel=\"noopener\">lumi\u00e8re cendr\u00e9e<\/a>) et l&#8217;<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/01\/08\/lamas-des-pleiades-au-dessus-de-letang\/\" target=\"_blank\" rel=\"noopener\">amas d&#8217;\u00e9toiles des Pl\u00e9iades<\/a> (en bas \u00e0 droite de l&#8217;image ci-dessous) :<\/p>\n<figure id=\"attachment_15897\" aria-describedby=\"caption-attachment-15897\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/05\/mercure-sodium2.jpg\" rel=\"lightbox[15895]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15897\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/05\/mercure-sodium2-450x301.jpg\" alt=\"\" width=\"450\" height=\"301\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/05\/mercure-sodium2-450x301.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/05\/mercure-sodium2-1024x684.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/05\/mercure-sodium2-768x513.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/05\/mercure-sodium2.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15897\" class=\"wp-caption-text\">Une \u00e9trange queue accompagne Mercure sur ce clich\u00e9 r\u00e9alis\u00e9 le 2 mai. \u00a9 Daniel Lopez \/ IAC<\/figcaption><\/figure>\n<p>Normalement, la photographie d&#8217;une plan\u00e8te sans instrument astronomique ne montre qu&#8217;un petit point lumineux. Vous l&#8217;avez d\u00e9j\u00e0 constat\u00e9 sur des clich\u00e9s comme celui-ci :<\/p>\n<figure id=\"attachment_14135\" aria-describedby=\"caption-attachment-14135\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/05\/lune-mercure.jpg\" rel=\"lightbox[15895]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-14135\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/05\/lune-mercure-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/05\/lune-mercure-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/05\/lune-mercure-1024x615.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/05\/lune-mercure-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/05\/lune-mercure.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-14135\" class=\"wp-caption-text\">Rendez-vous entre le croissant de Lune et Mercure (\u00e0 droite). \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>Pourtant, quand on la photographie avec un filtre interf\u00e9rentiel centr\u00e9 sur la raie du sodium \u00e0 589 nm, Mercure nous d\u00e9voile une queue de sodium qui s&#8217;\u00e9tire derri\u00e8re elle, dans la direction oppos\u00e9e au Soleil. Mais quelle est donc l&#8217;origine de cette \u00e9tonnante structure ?\u00a0 <!--more--><\/p>\n<h5>Coup de vent solaire :<\/h5>\n<p>Tr\u00e8s proche de notre \u00e9toile, Mercure est la plan\u00e8te la plus expos\u00e9e \u00e0 la pression exerc\u00e9e par les radiations solaires. Ce vent de particules emporte la tr\u00e8s fine atmosph\u00e8re de Mercure dans le sillage de la plan\u00e8te. C&#8217;est le m\u00eame ph\u00e9nom\u00e8ne qui est \u00e0 l&#8217;origine des <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-queue-comete-990\/\" target=\"_blank\" rel=\"noopener\">queues de com\u00e8tes<\/a>. L&#8217;atmosph\u00e8re de Mercure (en r\u00e9alit\u00e9 une mince exosph\u00e8re) est compos\u00e9e de diff\u00e9rents \u00e9l\u00e9ments (oxyg\u00e8ne, hydrog\u00e8ne, sodium, vapeur d\u2019eau&#8230;). Comme le sodium r\u00e9fl\u00e9chit beaucoup la lumi\u00e8re solaire, c&#8217;est cet \u00e9l\u00e9ment chimique qu&#8217;on met le mieux en \u00e9vidence dans la queue, \u00e0 condition de la photographier avec un filtre.<\/p>\n<p><iframe loading=\"lazy\" title=\"Mercure, curieuse plan\u00e8te des extr\u00eames | Futura\" width=\"474\" height=\"267\" src=\"https:\/\/www.youtube.com\/embed\/9hwvOkr_w5c?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>Les astronomes ont observ\u00e9 cette queue de sodium pour la premi\u00e8re fois en 2002. Ils ont d\u00e9couvert avec stup\u00e9faction qu&#8217;elle s&#8217;\u00e9tirait sur plus de vingt millions de kilom\u00e8tres ! Depuis, elle est r\u00e9guli\u00e8rement photographi\u00e9e. Vous la retrouverez par exemple sur un tr\u00e8s beau clich\u00e9 de <a href=\"https:\/\/apod.nasa.gov\/apod\/ap220503.html\" target=\"_blank\" rel=\"noopener\">Sebastian Voltmer<\/a>.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/05\/14\/le-rendez-vous-entre-la-lune-et-mercure-a-tenu-ses-promesses\/\" target=\"_blank\" rel=\"noopener\">Le rendez-vous entre la Lune et Mercure a tenu ses promesses<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/05\/22\/une-danseuse-aux-cotes-des-planetes-venus-et-mercure\/\" target=\"_blank\" rel=\"noopener\">Une danseuse aux c\u00f4t\u00e9s des plan\u00e8tes V\u00e9nus et Mercure<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/11\/12\/en-video-sdo-filme-le-transit-de-mercure-depuis-lespace\/\" target=\"_blank\" rel=\"noopener\">En vid\u00e9o : SDO filme le transit de Mercure depuis l&#8217;espace<\/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>C&#8217;est un ph\u00e9nom\u00e8ne astronomique connu depuis seulement vingt ans : la plan\u00e8te Mercure poss\u00e8de une gigantesque queue de sodium. Aspect com\u00e9taire : Non, vous vous trompez, ce que vous voyez n&#8217;est pas une com\u00e8te ! L&#8217;\u00e9tonnante photographie r\u00e9alis\u00e9e par Daniel Lopez (El Cielo De Canarias) le 2 mai 2022 depuis l&#8217;archipel des Canaries nous montre &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/05\/04\/mercure-devoile-son-impressionnante-queue-de-sodium\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La plan\u00e8te Mercure d\u00e9voile son \u00e9tonnante queue de sodium<\/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":15896,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[1065,140,3216],"class_list":["post-15895","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-daniel-lopez","tag-mercure","tag-sodium"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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