{"id":7746,"date":"2017-04-24T06:53:09","date_gmt":"2017-04-24T06:53:09","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7746"},"modified":"2017-05-03T14:27:42","modified_gmt":"2017-05-03T14:27:42","slug":"pluie-de-lyrides-dessus-desert-datacama","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/04\/24\/pluie-de-lyrides-dessus-desert-datacama\/","title":{"rendered":"Pluie de Lyrides au-dessus du d\u00e9sert d’Atacama"},"content":{"rendered":"

Du 16 au 25 avril l’essaim d’\u00e9toiles filantes des Lyrides lance ses fl\u00e8ches lumineuses, un spectacle immortalis\u00e9 par Yuri Beletsky au Chili.<\/strong><\/p>\n

Dans sa course autour du Soleil<\/a>, notre plan\u00e8te croise des petites poussi\u00e8res abandonn\u00e9es par des com\u00e8tes<\/a> sur leur orbite. En p\u00e9n\u00e9trant dans notre atmosph\u00e8re, ces poussi\u00e8res se consument et produisent un ph\u00e9nom\u00e8ne lumineux appel\u00e9 improprement \u00e9toile filante<\/a>. La date de chaque rencontre avec ces nuages de petits d\u00e9bris interplan\u00e9taires est bien connue et l’augmentation du nombre d’\u00e9toiles filantes qui en d\u00e9coule peut offrir un joli spectacle : c’est le cas pour des essaims comme les Taurides<\/a>, les Quadrantides<\/a> ou encore les c\u00e9l\u00e8bres Pers\u00e9ides<\/a> (les essaims portent le nom de la constellation d’o\u00f9 semblent jaillir les \u00e9toiles filantes).<\/p>\n

\"\"<\/a><\/p>\n

Chaque mois permet de suivre un ou plusieurs essaims m\u00e9t\u00e9oritiques et en avril ce sont les Lyrides dont le pic d’activit\u00e9 se produit autour du 22.<\/p>\n

L’essaim des Lyrides est l’un des plus anciens connus puisque son activit\u00e9 est mentionn\u00e9e dans les Annales des Printemps et des Automnes<\/em>, un ouvrage rapportant les grands \u00e9v\u00e9nements ayant jalonn\u00e9 le r\u00e8gne des douze princes qui ont dirig\u00e9 la Chine de 722 \u00e0 480 av. J.-C. (cette chronique cite \u00e9galement un autre ph\u00e9nom\u00e8ne astronomique c\u00e9l\u00e8bre, en l’occurrence le passage de la com\u00e8te de Halley<\/a> en 611 av. J.-C.).<\/p>\n

Pour immortaliser le maximum d’activit\u00e9 de l’essaim des Lyrides cette ann\u00e9e, l’astrophotographe Yuri Beletsky<\/a> s’est install\u00e9 dans le d\u00e9sert d’Atacama au pied de la coupole qui abrite le t\u00e9lescope de 1,3 m de diam\u00e8tre du projet OGLE<\/a> (Optical Gravitational Lensing Experiment<\/em>). 5 heures de poses mettent en \u00e9vidence le trac\u00e9 lumineux de nombreuses \u00e9toiles filantes provenant du radiant situ\u00e9 dans la constellation de la Lyre<\/a>, non loin de la Voie lact\u00e9e<\/a>. Remarquez sur la droite de cette image le gros point lumineux de la vieille Lune et en dessous au ras de l’horizon la plan\u00e8te V\u00e9nus, un rapprochement apparent visible \u00e9galement sur cette photographie prise en Bourgogne<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Du 16 au 25 avril l’essaim d’\u00e9toiles filantes des Lyrides lance ses fl\u00e8ches lumineuses, un spectacle immortalis\u00e9 par Yuri Beletsky au Chili. Dans sa course autour du Soleil, notre plan\u00e8te croise des petites poussi\u00e8res abandonn\u00e9es par des com\u00e8tes sur leur orbite. En p\u00e9n\u00e9trant dans notre atmosph\u00e8re, ces poussi\u00e8res se consument et produisent un ph\u00e9nom\u00e8ne lumineux … Continuer la lecture de Pluie de Lyrides au-dessus du d\u00e9sert d’Atacama<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":7747,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[635,103,634,2180,2181,159,1032,166,1016],"class_list":["post-7746","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-chili","tag-constellation-de-la-lyre","tag-desert-datacama","tag-lyrides","tag-ogle","tag-venus","tag-vieille-lune","tag-voie-lactee","tag-yuri-beletsky"],"yoast_head":"\nPluie de Lyrides au-dessus du d\u00e9sert d'Atacama<\/title>\n<meta name=\"description\" content=\"Du 16 au 25 avril l'essaim d'\u00e9toiles filantes des Lyrides lance ses 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