{"id":11125,"date":"2019-10-16T07:05:51","date_gmt":"2019-10-16T07:05:51","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=11125"},"modified":"2019-10-28T06:46:01","modified_gmt":"2019-10-28T06:46:01","slug":"a-la-decouverte-du-double-amas-detoiles-de-persee","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/10\/16\/a-la-decouverte-du-double-amas-detoiles-de-persee\/","title":{"rendered":"\u00c0 la d\u00e9couverte du double amas d&#8217;\u00e9toiles de Pers\u00e9e"},"content":{"rendered":"<p><strong>Le double amas de Pers\u00e9e est un des plus beaux objets c\u00e9lestes. il est en outre tr\u00e8s facile \u00e0 admirer au d\u00e9but des nuits d&#8217;automne.<\/strong><\/p>\n<p>Je vous invite \u00e0 sortir un soir \u00e0 la nuit tomb\u00e9e. Mettez-vous dans un endroit \u00e9loign\u00e9 de toute <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/09\/27\/tucson-la-ville-qui-fait-baisser-la-pollution-lumineuse\/\" target=\"_blank\" rel=\"noopener noreferrer\">pollution lumineuse<\/a> et tournez-vous en direction du nord. Laissez bien vos yeux s&#8217;accoutumer \u00e0 l&#8217;obscurit\u00e9 puis rep\u00e9rez le W caract\u00e9ristique de la constellation de Cassiop\u00e9e (vous pouvez utiliser la carte de <a href=\"https:\/\/www.stelvision.com\/carte-ciel\/\" target=\"_blank\" rel=\"noopener noreferrer\">Stelvision<\/a>). Vous remarquerez juste en dessous une petite tache cotonneuse au milieu des \u00e9toiles de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/08\/26\/en-video-quest-ce-que-la-voie-lactee\/\" target=\"_blank\" rel=\"noopener noreferrer\">Voie lact\u00e9e<\/a>.<\/p>\n<figure id=\"attachment_11126\" aria-describedby=\"caption-attachment-11126\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/08\/doublamas.jpg\" rel=\"lightbox[11125]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-11126\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/08\/doublamas-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/08\/doublamas-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/08\/doublamas-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/08\/doublamas-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/08\/doublamas.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-11126\" class=\"wp-caption-text\">Le double amas d&#8217;\u00e9toiles de la constellation de Pers\u00e9e. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>Il s&#8217;agit des amas d&#8217;\u00e9toiles NGC 869 et 884 qui s\u2019\u00e9tendent sur une surface apparente \u00e9quivalente \u00e0 la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/09\/26\/valse-a-trois-temps-pour-la-pleine-lune-du-25-septembre\/\" target=\"_blank\" rel=\"noopener noreferrer\">Pleine Lune<\/a> (30\u2032) mais qui sont beaucoup moins lumineux (<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener noreferrer\">magnitude<\/a> de 4).<!--more--><\/p>\n<p>N\u00e9s dans le m\u00eame nuage interstellaire, ces deux amas sont tr\u00e8s jeunes : moins de 15 millions d&#8217;ann\u00e9es. Ils sont magnifiques \u00e0 d\u00e9tailler dans une paire de jumelles. C&#8217;est l&#8217;instrument le mieux adapt\u00e9 pour les observer car si vous d\u00e9passez un grossissement de 25 fois, certaines de leurs \u00e9toiles sortiront de votre champ de vision. Le spectacle est indescriptible dans mes jumelles 16X70mm : des centaines de t\u00eates d&#8217;\u00e9pingles lumineuses semblent piqu\u00e9es dans le velours sombre du ciel nocturne. Peu d&#8217;objets c\u00e9lestes donnent une telle impression de relief dans cet instrument : un vrai r\u00e9gal ! Admirez le dessin qu&#8217;en a fait <a href=\"https:\/\/marty62100.wixsite.com\/mgsketching\/post\/le-double-amas-de-pers%C3%A9e\" target=\"_blank\" rel=\"noopener noreferrer\">Guillaume Martinod<\/a>.<\/p>\n<p>Le clich\u00e9 qui illustre cette chronique a \u00e9t\u00e9 obtenu avec 30 secondes de pose sur monture Vixen Polarie, bo\u00eetier Nikon D7100, 3200 iso, objectif 50 millim\u00e8tres de focale ouvert \u00e0 2,8.<\/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 double amas de Pers\u00e9e est un des plus beaux objets c\u00e9lestes. il est en outre tr\u00e8s facile \u00e0 admirer au d\u00e9but des nuits d&#8217;automne. Je vous invite \u00e0 sortir un soir \u00e0 la nuit tomb\u00e9e. Mettez-vous dans un endroit \u00e9loign\u00e9 de toute pollution lumineuse et tournez-vous en direction du nord. Laissez bien vos yeux &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/10\/16\/a-la-decouverte-du-double-amas-detoiles-de-persee\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">\u00c0 la d\u00e9couverte du double amas d&#8217;\u00e9toiles de Pers\u00e9e<\/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":11126,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[2709],"class_list":["post-11125","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-double-amas-de-persee"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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