{"id":5994,"date":"2016-08-29T16:30:28","date_gmt":"2016-08-29T16:30:28","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=5994"},"modified":"2016-09-11T11:31:25","modified_gmt":"2016-09-11T11:31:25","slug":"dentelles-constellation-cygne","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/08\/29\/dentelles-constellation-cygne\/","title":{"rendered":"Des Dentelles dans la constellation du Cygne"},"content":{"rendered":"<p><strong>La constellation du Cygne h\u00e9berge un immense r\u00e9manent de supernova particuli\u00e8rement photog\u00e9nique. Plong\u00e9e au c\u0153ur des Dentelles du Cygne.\u00a0<\/strong><\/p>\n<p>Il y a environ dix mille ans, la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/08\/08\/triangle-dete\/\" target=\"_blank\">constellation du Cygne<\/a> a connu un cataclysme. Une \u00e9toile \u00e0 l\u2019agonie a litt\u00e9ralement vol\u00e9 en \u00e9clats dans un violent soubresaut, devenant particuli\u00e8rement lumineuse (c&#8217;est ce qu&#8217;on appelle une <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/09\/03\/lecharpe-cosmique-laissee-par-la-supernova-sn-1006\/\" target=\"_blank\">supernova<\/a>) en m\u00eame temps qu\u2019elle projetait sa mati\u00e8re dans l\u2019espace.<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/64f2MEM67Qg\" frameborder=\"0\" 0=\"allowfullscreen&gt;&lt;\/iframe\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<p>Cette mati\u00e8re continue de s\u2019\u00e9tendre en se diluant dans l&#8217;espace et forme aujourd\u2019hui un r\u00e9seau complexe de filaments d\u2019oxyg\u00e8ne et d\u2019hydrog\u00e8ne illumin\u00e9s par le passage de l\u2019onde de choc issue de la supernova (tout comme <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/12\/18\/snr-0519-un-remanent-de-supernova-tout-en-finesse\/\" target=\"_blank\">SNR 0519<\/a> dans la constellation de la Dorade).<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/dentelles_cygne-1.jpg\" rel=\"lightbox[5994]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-5998\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/dentelles_cygne-1-450x450.jpg\" alt=\"dentelles_cygne\" width=\"450\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/dentelles_cygne-1-450x450.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/dentelles_cygne-1-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/dentelles_cygne-1-768x768.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/dentelles_cygne-1.jpg 1000w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Le r\u00e9manent de supernova du Cygne repr\u00e9sente actuellement une coquille gazeuse situ\u00e9e \u00e0 1.500 ann\u00e9es-lumi\u00e8re de nous, dont les diff\u00e9rentes parties s&#8217;\u00e9tendent sur une surface apparente d&#8217;une dizaine de degr\u00e9s carr\u00e9s (pour m\u00e9moire la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/06\/22\/20-juin-pleine-lune-fraises-solstice\/\" target=\"_blank\">Pleine Lune<\/a> repr\u00e9sente 1\/2 degr\u00e9 carr\u00e9). On distingue principalement la Grande Dentelle (NGC 6992, NGC 6995 et IC 1340) et la Petite Dentelle (NGC 6960).<!--more--><\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/dentelles_cygne.jpg\" rel=\"lightbox[5994]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-5995\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/dentelles_cygne-450x371.jpg\" alt=\"dentelles_cygne\" width=\"450\" height=\"371\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/dentelles_cygne-450x371.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/dentelles_cygne-768x633.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/dentelles_cygne-1024x844.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/dentelles_cygne.jpg 1300w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Les Dentelles du Cygne (<em>Veil nebula<\/em>) sont particuli\u00e8rement photog\u00e9niques surtout si l&#8217;on effectue de tr\u00e8s longues poses. C&#8217;est ce qu&#8217;a fait l&#8217;astrophotographe italien <a href=\"http:\/\/www.alessandrofalesiedi.it\/deep-sky-en\/ngc-6992-6995-veil-nebula-2\/\" target=\"_blank\">Alessandro Falesiedi<\/a>.<\/p>\n<p>L&#8217;image ci-dessus (qui ne montre qu&#8217;une infime partie de la Grande Dentelle) repr\u00e9sente plus de 25 heures de poses dans diff\u00e9rentes longueurs d&#8217;onde \u00e9tal\u00e9es sur plusieurs nuits \u00e0 l&#8217;aide d&#8217;une cam\u00e9ra CCD \u00a0refroidie plac\u00e9e derri\u00e8re un t\u00e9lescope de 28 cm de diam\u00e8tre.<\/p>\n<p>Bien qu&#8217;elles ne montrent pas de telles couleurs quand on les admire m\u00eame dans un gros t\u00e9lescope, les Dentelles sont \u00e9galement tr\u00e8s pris\u00e9es des astrodessinateurs (voir par exemple leur repr\u00e9sentation sur le site de <a href=\"http:\/\/www.deepsky-drawings.com\/ngc-6992-6995-ic-1340\/dsdlang\/en\" target=\"_blank\">Bertrand Laville<\/a>).<\/p>\n<p>&nbsp;<\/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>La constellation du Cygne h\u00e9berge un immense r\u00e9manent de supernova particuli\u00e8rement photog\u00e9nique. Plong\u00e9e au c\u0153ur des Dentelles du Cygne.\u00a0 Il y a environ dix mille ans, la constellation du Cygne a connu un cataclysme. Une \u00e9toile \u00e0 l\u2019agonie a litt\u00e9ralement vol\u00e9 en \u00e9clats dans un violent soubresaut, devenant particuli\u00e8rement lumineuse (c&#8217;est ce qu&#8217;on appelle une &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/08\/29\/dentelles-constellation-cygne\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Des Dentelles dans la constellation du Cygne<\/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":5995,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[1724,1725,102,1719,1726,1720,1721,1722,1178,403,1723],"class_list":["post-5994","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-alessandro-falesiedi","tag-bertrand-laville","tag-constellation-du-cygne","tag-dentelles-du-cygne","tag-ic-1340","tag-ngc-6960","tag-ngc-6992","tag-ngc-6995","tag-remanent","tag-supernova","tag-veil-nebula"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Des Dentelles dans la constellation du Cygne<\/title>\n<meta name=\"description\" content=\"La constellation du Cygne h\u00e9berge un immense r\u00e9manent de supernova particuli\u00e8rement photog\u00e9nique. 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