{"id":7514,"date":"2017-06-07T14:20:23","date_gmt":"2017-06-07T14:20:23","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7514"},"modified":"2017-06-18T19:50:12","modified_gmt":"2017-06-18T19:50:12","slug":"messier-35-ngc-2158-deux-joyaux-gemeaux","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/07\/messier-35-ngc-2158-deux-joyaux-gemeaux\/","title":{"rendered":"Messier 35 et NGC 2158, deux joyaux dans les G\u00e9meaux"},"content":{"rendered":"<p><strong>La constellation des G\u00e9meaux rec\u00e8le deux amas ouverts tr\u00e8s proches l&#8217;un de l&#8217;autre et tr\u00e8s photog\u00e9niques, Messier 35 et NGC 2158.<\/strong><\/p>\n<p>Au mois de mai 2015 je vous avais propos\u00e9 une de mes images montrant V\u00e9nus non loin de Messier 35 (\u00e0 retrouver <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/10\/venus-croise-lamas-detoiles-messier-35\/\" target=\"_blank\" rel=\"noopener noreferrer\">ici<\/a>). Ce clich\u00e9, pris avec une pose de 5 sec et un simple objectif de 50 mm de focale montrait cet amas d&#8217;\u00e9toiles comme une toute petite pelote d&#8217;\u00e9pingles. Avec le talent d&#8217;un astrophotographe comme <a href=\"http:\/\/www.rolfolsenastrophotography.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">Rolf Olsen<\/a>, cette r\u00e9gion du ciel prend un tout autre aspect.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/03\/rolf_olsen.jpg\" rel=\"lightbox[7514]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-7515\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/03\/rolf_olsen-450x339.jpg\" alt=\"\" width=\"450\" height=\"339\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/03\/rolf_olsen-450x339.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/03\/rolf_olsen-768x578.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/03\/rolf_olsen-1024x771.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/03\/rolf_olsen.jpg 1330w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>L&#8217;image ci-dessus, r\u00e9alis\u00e9e le 19 f\u00e9vrier depuis la Nouvelle-Z\u00e9lande avec un t\u00e9lescope de 30 cm de diam\u00e8tre et un total de 2,5 heures de poses cumul\u00e9es, d\u00e9voile la beaut\u00e9 de Messier 35 et d&#8217;un voisin plus discret, NGC 2158.<!--more--><\/p>\n<p>Ces deux amas d&#8217;\u00e9toiles ouverts sont observables dans la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/08\/21\/lune-les-gemeaux\/\" target=\"_blank\" rel=\"noopener noreferrer\">constellation des G\u00e9meaux<\/a>.\u00a0Messier 35 est le plus grand : situ\u00e9 dans le coin sup\u00e9rieur gauche de l&#8217;image, il se trouve \u00e0 2.800 ann\u00e9es-lumi\u00e8re de distance et sa magnitude est de 5.2. Il couvre une zone de ciel \u00e9quivalente \u00e0 celle de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/03\/13\/la-pleine-lune-du-corbeau-se-leve-sur-lyon\/\" target=\"_blank\" rel=\"noopener noreferrer\">Pleine Lune<\/a> et contient environ 2.500 \u00e9toiles, la plupart \u00e9tant de jeunes \u00e9toiles bleues comme celles que l&#8217;on observe dans l&#8217;amas des <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/11\/19\/lamas-des-pleiades-seleve-au-dessus-du-brouillard\/\" target=\"_blank\" rel=\"noopener noreferrer\">Pl\u00e9iades<\/a> (l&#8217;\u00e2ge de l&#8217;amas M 35 est estim\u00e9 \u00e0 100 millions d&#8217;ann\u00e9es). D\u00e9couvert en 1745 par l&#8217;astronome Jean-Philippe de Ch\u00e9seaux, l&#8217;amas fut inclus par Charles Messier \u00e0 la 35\u00e8me position dans son c\u00e9l\u00e8bre <a href=\"http:\/\/www.futura-sciences.com\/sciences\/actualites\/astronomie-astronomie-catalogue-messier-250-ans-16597\/\" target=\"_blank\" rel=\"noopener noreferrer\">catalogue des objets n\u00e9buleux<\/a>.<\/p>\n<p>Au SUD-OUEST de Messier 35, en bas \u00e0 droite de l&#8217;image, se trouve NGC 2158 qui est pr\u00e8s de quatre fois plus \u00e9loign\u00e9 et contient beaucoup plus d&#8217;\u00e9toiles (NGC signifie\u00a0<em>New General Catalogue of Nebulae and Clusters of Stars<\/em>). Il est \u00e9galement beaucoup plus vieux, son \u00e2ge \u00e9tant estim\u00e9 \u00e0 environ 2 milliards d&#8217;ann\u00e9es (ce qui explique qu&#8217;il soit riche en \u00e9toiles orang\u00e9es).<\/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 des G\u00e9meaux rec\u00e8le deux amas ouverts tr\u00e8s proches l&#8217;un de l&#8217;autre et tr\u00e8s photog\u00e9niques, Messier 35 et NGC 2158. Au mois de mai 2015 je vous avais propos\u00e9 une de mes images montrant V\u00e9nus non loin de Messier 35 (\u00e0 retrouver ici). Ce clich\u00e9, pris avec une pose de 5 sec et un &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/07\/messier-35-ngc-2158-deux-joyaux-gemeaux\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Messier 35 et NGC 2158, deux joyaux dans les G\u00e9meaux<\/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":7515,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[134,133,91,1292,1021,2137,2138],"class_list":["post-7514","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-amas-ouvert","tag-charles-messier","tag-constellation-des-gemeaux","tag-jean-philippe-de-cheseaux","tag-messier-35","tag-ngc-2158","tag-rolf-olsen"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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