{"id":3541,"date":"2015-09-07T04:51:57","date_gmt":"2015-09-07T04:51:57","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=3541"},"modified":"2015-09-14T04:55:56","modified_gmt":"2015-09-14T04:55:56","slug":"retour-sur-loccultation-daldebaran-le-5-septembre","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/09\/07\/retour-sur-loccultation-daldebaran-le-5-septembre\/","title":{"rendered":"Retour sur l&#8217;occultation d&#8217;Ald\u00e9baran le 5 septembre"},"content":{"rendered":"<p><strong>Le 5 septembre, quelques astrophotographes sont parvenus \u00e0 immortaliser l&#8217;occultation d&#8217;Ald\u00e9baran, la plus brillante \u00e9toile de la constellation du Taureau.<\/strong><\/p>\n<p>La disparition d&#8217;une \u00e9toile brillante derri\u00e8re la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/25\/en-vendee-des-bateaux-sous-la-lune\/\" target=\"_blank\">Lune <\/a>est un spectacle qui a sans doute marqu\u00e9 les esprits \u00e0 une \u00e9poque recul\u00e9e o\u00f9 la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/06\/28\/pollution-lumineuse\/\" target=\"_blank\">pollution lumineuse<\/a> n&#8217;existait pas. Dans le cas d&#8217;<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/09\/04\/la-lune-occulte-aldebaran-a-laube-du-5-septembre\/\" target=\"_blank\">Ald\u00e9baran<\/a> (<em>Alpha Tauri<\/em>), l&#8217;une de ses occultations fut d\u00e9j\u00e0 consign\u00e9e par des astrologues japonais en 640 av JC ! Plus pr\u00e8s de nous le polonais Nicolas Copernic en mentionna une autre en 1497.<\/p>\n<p>En 1978, des chercheurs de l&#8217;<em><a href=\"https:\/\/www.iastate.edu\/\" target=\"_blank\">Iowa State University<\/a>\u00a0<\/em>utilis\u00e8rent un photom\u00e8tre ultra-rapide pour mesurer le temps que mettait Ald\u00e9baran pour dispara\u00eetre derri\u00e8re le limbe lunaire : 1\/30e de sec, ce qui correspond \u00e0 un diam\u00e8tre apparent angulaire de 0,02 sec d&#8217;arc.<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" src=\"https:\/\/player.vimeo.com\/video\/134736291\" width=\"500\" height=\"375\" frameborder=\"0\" 0=\"webkitallowfullscreen\" 1=\"mozallowfullscreen\" 2=\"allowfullscreen\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<p style=\"text-align: center\"><strong>En vid\u00e9o : variations lunaires<\/strong><\/p>\n<p>La s\u00e9rie actuelle des occultations d&#8217;Ald\u00e9baran a commenc\u00e9 le 29 janvier 2015 et prendra fin le 3 septembre 2018. Durant cette p\u00e9riode il se produira 48 occultations d&#8217;<em>Alpha Tauri\u00a0<\/em>mais en moyenne seules 8 \u00e0 10 seront visibles depuis un lieu d&#8217;observation donn\u00e9. Pour voir plus d&#8217;occultations, il faudra voyager !<\/p>\n<p><!--more-->Les <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/14\/lumiere-rouge-les-astronomes\/\" target=\"_blank\">astronomes <\/a>attendront ensuite le 18 ao\u00fbt 2033 pour assister \u00e0 une nouvelle vague d&#8217;occultations : La Lune repassera entre la Terre et Ald\u00e9baran, une configuration g\u00e9om\u00e9trique qui revient au bout d&#8217;un <a href=\"http:\/\/www.futura-sciences.com\/magazines\/espace\/infos\/dico\/d\/univers-saros-502\/\" target=\"_blank\">Saros <\/a>(un cycle d&#8217;un peu plus de 18 ans).<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/09\/aldebaran3.jpg\" rel=\"lightbox[3541]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-3543\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/09\/aldebaran3-450x268.jpg\" alt=\"aldebaran3\" width=\"450\" height=\"268\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/09\/aldebaran3-450x268.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/09\/aldebaran3-1024x610.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/09\/aldebaran3.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>L&#8217;astrophotographe allemand\u00a0<a href=\"http:\/\/spaceweathergallery.com\/indiv_upload.php?upload_id=117117&amp;PHPSESSID=l011i6js6v5s4dffmnbsolndb2\" target=\"_blank\">Sven Melchert<\/a> n&#8217;a pas attendu 2033 pour immortaliser ce spectacle. Le 5 septembre \u00e0 l&#8217;aube il a saisi la disparition puis le retour d&#8217;Ald\u00e9baran une heure plus tard dans un ciel bien clair (images ci-dessus).<\/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 5 septembre, quelques astrophotographes sont parvenus \u00e0 immortaliser l&#8217;occultation d&#8217;Ald\u00e9baran, la plus brillante \u00e9toile de la constellation du Taureau. La disparition d&#8217;une \u00e9toile brillante derri\u00e8re la Lune est un spectacle qui a sans doute marqu\u00e9 les esprits \u00e0 une \u00e9poque recul\u00e9e o\u00f9 la pollution lumineuse n&#8217;existait pas. Dans le cas d&#8217;Ald\u00e9baran (Alpha Tauri), l&#8217;une &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/09\/07\/retour-sur-loccultation-daldebaran-le-5-septembre\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Retour sur l&#8217;occultation d&#8217;Ald\u00e9baran le 5 septembre<\/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":3543,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[373,1226,82,106,424,1227],"class_list":["post-3541","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-aldebaran","tag-alpha-tauri","tag-lune","tag-occultation","tag-saros","tag-sven-melchert"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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