{"id":13989,"date":"2021-06-18T15:40:01","date_gmt":"2021-06-18T15:40:01","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=13989"},"modified":"2021-06-26T11:10:44","modified_gmt":"2021-06-26T11:10:44","slug":"ngc-2626-une-nebuleuse-bleue-dans-la-constellation-des-voiles","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/06\/18\/ngc-2626-une-nebuleuse-bleue-dans-la-constellation-des-voiles\/","title":{"rendered":"NGC 2626, une n\u00e9buleuse bleue dans la constellation des Voiles"},"content":{"rendered":"<p><strong>Bien que le rouge semble dominer dans les nuages cosmiques, on trouve parfois une touche de bleu. Exemple avec la n\u00e9buleuse NGC 2626.<\/strong><\/p>\n<h5>Cap au sud :<\/h5>\n<p>Si vous souhaitez un jour admirer NGC 2626, il faudra vous rendre dans l&#8217;h\u00e9misph\u00e8re sud. Cette n\u00e9buleuse se situe en effet dans la constellation australe des Voiles, non loin de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/12\/14\/la-nebuleuse-de-la-carene-une-immense-region-h-ii\/\" target=\"_blank\" rel=\"noopener\">Car\u00e8ne<\/a>. Vous profiterez sans aucun doute de ce voyage pour d\u00e9couvrir d&#8217;autres merveilles c\u00e9lestes australes, comme les <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/02\/les-nuages-de-magellan-dans-le-ciel-du-chili\/\" target=\"_blank\" rel=\"noopener\">Nuages de Magellan<\/a>.<\/p>\n<figure id=\"attachment_2307\" aria-describedby=\"caption-attachment-2307\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/eso1.jpg\" rel=\"lightbox[13989]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-2307\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/eso1-450x278.jpg\" alt=\"\" width=\"450\" height=\"278\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/eso1-450x278.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/eso1-1024x633.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/03\/eso1.jpg 1455w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-2307\" class=\"wp-caption-text\">Les Nuages de Magellan sont visibles depuis l&#8217;h\u00e9misph\u00e8re sud. \u00a9 ESO\/J. Colosimo<\/figcaption><\/figure>\n<p>Situ\u00e9e \u00e0 plus de 3.000 ann\u00e9es-lumi\u00e8re, NGC 2626 a \u00e9t\u00e9 d\u00e9couverte en 1835 par John Herschel, fils de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/12\/telescope-william-herschel\/\" target=\"_blank\" rel=\"noopener\">William Herschel<\/a> et neveu de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/03\/portrait-caroline-herschel-astronome-de-lombre-a-la-lumiere\/\" target=\"_blank\" rel=\"noopener\">Caroline Herschel<\/a>. La n\u00e9buleuse a ensuite \u00e9t\u00e9 enregistr\u00e9e dans l\u2019imposant\u00a0<em>New General Catalogue of Nebulae and Clusters of Stars<\/em>\u00a0(NGC)\u00a0qui regroupe pr\u00e8s de 8.000 objets du ciel profond.<!--more--><\/p>\n<h5>Du rouge au bleu :<\/h5>\n<p>Les photographies astronomiques du ciel profond nous montrent souvent des nuages cosmiques rouges. Il s&#8217;agit de n\u00e9buleuses en \u00e9mission dans lesquelles l&#8217;hydrog\u00e8ne alpha est ionis\u00e9 (excit\u00e9) par le rayonnement de jeunes \u00e9toiles chaudes. Messier 17, <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/10\/15\/en-video-zoom-sur-messier-17-la-nebuleuse-omega\/\" target=\"_blank\" rel=\"noopener\">la n\u00e9buleuse Om\u00e9ga<\/a>, en est un bel exemple.<\/p>\n<figure id=\"attachment_13990\" aria-describedby=\"caption-attachment-13990\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/neb.jpg\" rel=\"lightbox[13989]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-13990\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/neb-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/neb-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/neb-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/neb-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/neb.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-13990\" class=\"wp-caption-text\">NGC 2626, une n\u00e9buleuse bleue dans la constellation des Voiles. \u00a9 CTIO\/NOIRLab\/NSF<\/figcaption><\/figure>\n<p>Le cas de NGC 2626 est diff\u00e9rent. Il s&#8217;agit d&#8217;une n\u00e9buleuse par r\u00e9flexion. Les \u00e9toiles environnantes ne sont pas assez chaudes pour ioniser le gaz. Mais la lumi\u00e8re de ces \u00e9toiles suffit \u00e0 \u00e9clairer la n\u00e9buleuse dans laquelle la poussi\u00e8re diffuse plus efficacement la couleur bleue. C&#8217;est le m\u00eame principe physique qui rend bleu le ciel diurne.<\/p>\n<h5>Cible pour &#8220;petit&#8221; t\u00e9lescope :<\/h5>\n<p>Ce clich\u00e9 propos\u00e9 par <a href=\"https:\/\/noirlab.edu\/public\/images\/iotw2115a\/\" target=\"_blank\" rel=\"noopener\">NOIRLab<\/a> a \u00e9t\u00e9 obtenu avec un t\u00e9lescope de 90 centim\u00e8tres du r\u00e9seau <a href=\"https:\/\/noirlab.edu\/public\/programs\/ctio\/smarts-09m-telescope\/\" target=\"_blank\" rel=\"noopener\">SMARTS<\/a>. <em>Small and Moderate Aperture Research Telescope System<\/em> regroupe quatre t\u00e9lescopes d&#8217;environ un m\u00e8tre de diam\u00e8tre. Ils sont implant\u00e9s \u00e0 l&#8217;Observatoire chilien du <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/01\/20\/le-cerro-tololo-un-observatoire-dans-la-cordillere-des-andes\/\" target=\"_blank\" rel=\"noopener\">Cerro Tololo<\/a>, dans la Cordill\u00e8re des Andes. Ces instruments construits dans les ann\u00e9es 1960 sont aujourd&#8217;hui trop modestes pour les recherches men\u00e9es en astrophysique.<\/p>\n<figure id=\"attachment_13991\" aria-describedby=\"caption-attachment-13991\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/smarts.jpg\" rel=\"lightbox[13989]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-13991\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/smarts-450x300.jpg\" alt=\"\" width=\"450\" height=\"300\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/smarts-450x300.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/smarts-1024x683.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/smarts-768x512.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/04\/smarts.jpg 1280w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-13991\" class=\"wp-caption-text\">Ce t\u00e9lescope de 90 centim\u00e8tres de diam\u00e8tre construit en 1965 fait partie du Moderate Aperture Research Telescope System (SMARTS). \u00a9 CTIO\/NOIRLab\/NSF\/AURA<\/figcaption><\/figure>\n<p>Avec SMARTS, ils retrouvent une seconde jeunesse. Ils sont mis \u00e0 la disposition de particuliers ou d&#8217;universit\u00e9s pour conduire certains travaux. L&#8217;occasion pour de jeunes chercheurs de &#8220;se faire la main&#8221; au cours de leurs \u00e9tudes avant de pouvoir un jour travailler avec de plus grands instruments.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/24\/un-systeme-stellaire-triple-se-cache-dans-la-nebuleuse-du-crane\/\" target=\"_blank\" rel=\"noopener\">Un syst\u00e8me stellaire triple se cache dans la n\u00e9buleuse du Cr\u00e2ne<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/12\/07\/la-metamorphose-dune-nebuleuse-na-pris-que-20-ans\/\" target=\"_blank\" rel=\"noopener\">La m\u00e9tamorphose d&#8217;une n\u00e9buleuse n&#8217;a pris que 20 ans<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/10\/lhistoire-de-la-nebuleuse-de-la-belle-au-bois-dormant-alias-egb-9\/\" target=\"_blank\" rel=\"noopener\">EGB9, la n\u00e9buleuse retrouv\u00e9e par des amateurs<\/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>Bien que le rouge semble dominer dans les nuages cosmiques, on trouve parfois une touche de bleu. Exemple avec la n\u00e9buleuse NGC 2626. Cap au sud : Si vous souhaitez un jour admirer NGC 2626, il faudra vous rendre dans l&#8217;h\u00e9misph\u00e8re sud. Cette n\u00e9buleuse se situe en effet dans la constellation australe des Voiles, non &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/06\/18\/ngc-2626-une-nebuleuse-bleue-dans-la-constellation-des-voiles\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">NGC 2626, une n\u00e9buleuse bleue dans la constellation des Voiles<\/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":13990,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[908,3025,3026,3027],"class_list":["post-13989","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-des-voiles","tag-ngc-2626","tag-noirlab","tag-smarts"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NGC 2626, une n\u00e9buleuse bleue dans la constellation des Voiles<\/title>\n<meta name=\"description\" content=\"Bien que le rouge semble dominer dans les nuages cosmiques, on trouve parfois une touche de bleu. 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