{"id":10071,"date":"2019-01-08T09:12:52","date_gmt":"2019-01-08T09:12:52","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=10071"},"modified":"2019-01-15T17:25:04","modified_gmt":"2019-01-15T17:25:04","slug":"lamas-des-pleiades-au-dessus-de-letang","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/01\/08\/lamas-des-pleiades-au-dessus-de-letang\/","title":{"rendered":"L’amas des Pl\u00e9iades au-dessus de l’\u00e9tang"},"content":{"rendered":"

Le plus bel amas d’\u00e9toiles, celui des Pl\u00e9iades, est un objet c\u00e9leste incontournable des soir\u00e9es de janvier. Partons \u00e0 sa d\u00e9couverte.<\/strong><\/p>\n

La soir\u00e9e s’annonce d\u00e9gag\u00e9e et vous avez envie de d\u00e9couvrir une curiosit\u00e9 c\u00e9leste facilement identifiable \u00e0 l’\u0153il nu ? C\u2019est le moment de partir \u00e0 la d\u00e9couverte d\u2019un tr\u00e8s bel amas d\u2019\u00e9toiles (celui des Pl\u00e9iades) avant le retour de la Lune<\/a>.\u00a0\u00c0 l\u2019\u0153il nu cet amas ressemble \u00e0 une petite tache laiteuse (voir l\u2019image plus bas) constitu\u00e9e de 7 \u00e9toiles relativement brillantes (elles ont des magnitudes<\/a> comprises entre 3 et 5) qui sont Alcyone, Atlas, M\u00e9rope, \u00c9lectre, Ma\u00efa, Tayg\u00e8te et Pl\u00e9ion\u00e9.<\/p>\n

\"\"<\/a>
L’amas des Pl\u00e9iades ressemble \u00e0 une petite tache laiteuse. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n

Les observateurs ayant une vue per\u00e7ante parviennent \u00e0 d\u00e9nombrer jusqu\u2019\u00e0 12 \u00e9toiles quand ils l’observent sous un excellent ciel sans aucune\u00a0pollution lumineuse<\/a>.<\/p>\n

L’amas des Pl\u00e9iades\u00a0(\u00e9galement appel\u00e9 Messier 45, la r\u00e9f\u00e9rence de cet objet c\u00e9leste dans le catalogue qu\u2019a \u00e9tabli au XVIIIe si\u00e8cle l\u2019astronome fran\u00e7ais Charles Messier<\/a>)\u00a0se situe \u00e0 444 ann\u00e9es-lumi\u00e8re de nous dans la\u00a0constellation du Taureau<\/a>. Si vos yeux suffiront \u00e0 l’admirer dans le ciel hivernal (en d\u00e9but de nuit il s’\u00e9l\u00e8ve rapidement au-dessus de l’horizon NORD-EST), une paire de jumelles<\/a>, une petite\u00a0lunette astronomique<\/a>\u00a0ou une simple longue-vue<\/a> permettent de mieux en appr\u00e9cier la beaut\u00e9. Utilisez un faible grossissement pour voir tout l’amas dans le champ de l’instrument car Messier 45 est un objet tr\u00e8s \u00e9tendu qui couvre sur le ciel une surface \u00e9quivalente \u00e0 quatre fois celle de la Pleine Lune<\/a>.<\/p>\n

Les \u00e9toiles de l\u2019amas sont n\u00e9es ensemble il y a une centaine de millions d\u2019ann\u00e9es et certaines sont encore entour\u00e9es de n\u00e9bulosit\u00e9s qui s\u2019effilochent peu \u00e0 peu et ne sont visibles que sur des photographies prises au t\u00e9lescope. Depuis leur naissance elles s\u2019\u00e9loignent les unes des autres ; dans 250 millions d\u2019ann\u00e9es il ne restera plus rien de l\u2019amas et les \u00e9toiles poursuivront solitairement leur \u00e9volution.<\/p>\n

L’image qui illustre cet article repr\u00e9sente une pose de 30 secondes \u00e0 6400 iso avec un bo\u00eetier Nikon D7100 et un objectif Samyang de 8 millim\u00e8tres de focale ouvert \u00e0 5,6.<\/p>\n

L’\u00e9toile brillante sous l’amas que l’on voit sur cette image est Ald\u00e9baran<\/a>, la plus brillante de la constellation du Taureau. Son nom vient de l’arabe al dabaran<\/em> qui signifie le suiveur, celui qui vient derri\u00e8re (derri\u00e8re les Pl\u00e9iades).<\/p>\n","protected":false},"excerpt":{"rendered":"

Le plus bel amas d’\u00e9toiles, celui des Pl\u00e9iades, est un objet c\u00e9leste incontournable des soir\u00e9es de janvier. Partons \u00e0 sa d\u00e9couverte. La soir\u00e9e s’annonce d\u00e9gag\u00e9e et vous avez envie de d\u00e9couvrir une curiosit\u00e9 c\u00e9leste facilement identifiable \u00e0 l’\u0153il nu ? C\u2019est le moment de partir \u00e0 la d\u00e9couverte d\u2019un tr\u00e8s bel amas d\u2019\u00e9toiles (celui des … Continuer la lecture de L’amas des Pl\u00e9iades au-dessus de l’\u00e9tang<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":10072,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[713,132,437],"class_list":["post-10071","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-amas-des-pleiades","tag-constellation-du-taureau","tag-messier-45"],"yoast_head":"\nL'amas des Pl\u00e9iades au-dessus de l'\u00e9tang<\/title>\n<meta name=\"description\" content=\"Le plus bel amas d'\u00e9toiles, celui des Pl\u00e9iades, est un objet c\u00e9leste incontournable des soir\u00e9es de janvier. 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