{"id":12371,"date":"2020-09-03T17:44:13","date_gmt":"2020-09-03T17:44:13","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=12371"},"modified":"2020-09-12T09:04:31","modified_gmt":"2020-09-12T09:04:31","slug":"cest-le-moment-dadmirer-la-constellation-de-la-grande-ourse","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/09\/03\/cest-le-moment-dadmirer-la-constellation-de-la-grande-ourse\/","title":{"rendered":"C’est le moment d’admirer la constellation de la Grande Ourse"},"content":{"rendered":"

La fin de l’\u00e9t\u00e9 est la p\u00e9riode id\u00e9ale pour partir \u00e0 la d\u00e9couverte de la c\u00e9l\u00e8bre constellation de la Grande Ourse une fois la nuit tomb\u00e9e.<\/strong><\/p>\n

Un c\u00e9l\u00e8bre chariot :<\/h5>\n

La Grande Ourse est une constellation circumpolaire comme celle de\u00a0Cassiop\u00e9e<\/a>. Cela signifie qu\u2019elle ne se couche jamais pour un observateur situ\u00e9 aux latitudes de la France. Pour la localiser, attendez que le ciel soit assez sombre. Aux alentours de 22 h temps local, portez votre regard en direction du nord-ouest. Vous pourrez la suivre toute la nuit. La rotation terrestre va l’entra\u00eener au raz de l\u2019horizon nord, passant de l’ouest \u00e0 l’est.<\/p>\n

\"\"<\/a>
La constellation de la Grande Ourse en d\u00e9but d’une nuit d’\u00e9t\u00e9. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n

L’image ci-dessus a \u00e9t\u00e9 r\u00e9alis\u00e9e devant l’entr\u00e9e du ch\u00e2teau de Maillezais (voir \u00e9galement Jupiter \u00e9tincelle au-dessus de l’abbaye de Maillezais<\/a>) dans le Marais Poitevin. Une seule pose de 5 minutes \u00e0 200 iso avec un bo\u00eetier Nikon D7100. Objectif de 12 mm de focale.<\/p>\n

La constellation de la Grande Ourse fait partie des 48 constellations identifi\u00e9es par l\u2019astronome grec Claude Ptol\u00e9m\u00e9e au 2\u00e8me si\u00e8cle apr\u00e8s J-C. Bien que tr\u00e8s \u00e9tendue, cette constellation est souvent r\u00e9duite \u00e0 ses sept \u00e9toiles les plus brillantes. Leur disposition \u00e9voque une grande casserole ou un grand chariot. Les \u00e9toiles du manche de la casserole sont Alka\u00efd, Mizar et Alioth, celles du r\u00e9cipient sont Megrez, Phecda, Merak et Dubhe.
\n<\/span><\/p>\n

\"\"<\/a><\/p>\n

Mizar-Alcor, un couple l\u00e9gendaire :<\/h5>\n

<\/span>Une \u00e9toile de cette constellation retiendra notre attention : il s\u2019agit de Mizar. Elle poss\u00e8de un compagnon tr\u00e8s proche, Alcor. La l\u00e9gende veut que tout archer capable de distinguer les deux \u00e9toiles \u00e0 l\u2019\u0153il nu \u00e9tait admis dans l\u2019arm\u00e9e de Gengis Khan, le terrible chef mongol.<\/p>\n

Mizar (Zeta Ursae Majoris<\/em>) est une \u00e9toile de magnitude<\/a> 2,27 ; Alcor (0 Ursae Majoris<\/em>) est un peu plus faible (magnitude 3,99) et en est distante de 11,5 minutes d\u2019arc, ce qui repr\u00e9sente environ le tiers du diam\u00e8tre apparent de la\u00a0Pleine Lune<\/a>. Ce couple d\u2019\u00e9toiles se trouve \u00e0 un peu moins de 80 ann\u00e9es-lumi\u00e8re de la Terre. Un couple, est-ce vraiment certain ? C’est ce qu’on a cru jusqu’\u00e0 l’apparition des t\u00e9lescopes. On sait aujourd’hui que le syst\u00e8me Mizar-Alcor est en r\u00e9alit\u00e9 constitu\u00e9 de 6 \u00e9toiles li\u00e9es gravitationnellement…<\/p>\n","protected":false},"excerpt":{"rendered":"

La fin de l’\u00e9t\u00e9 est la p\u00e9riode id\u00e9ale pour partir \u00e0 la d\u00e9couverte de la c\u00e9l\u00e8bre constellation de la Grande Ourse une fois la nuit tomb\u00e9e. Un c\u00e9l\u00e8bre chariot : La Grande Ourse est une constellation circumpolaire comme celle de\u00a0Cassiop\u00e9e. Cela signifie qu\u2019elle ne se couche jamais pour un observateur situ\u00e9 aux latitudes de la … Continuer la lecture de C’est le moment d’admirer la constellation de la Grande Ourse<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":12372,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[456],"class_list":["post-12371","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-de-la-grande-ourse"],"yoast_head":"\nC'est le moment d'admirer la constellation de la Grande Ourse<\/title>\n<meta name=\"description\" content=\"La fin de l'\u00e9t\u00e9 est la p\u00e9riode id\u00e9ale pour partir \u00e0 la d\u00e9couverte de la c\u00e9l\u00e8bre constellation de la Grande Ourse une fois la nuit tomb\u00e9e.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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