{"id":740,"date":"2014-08-08T07:28:05","date_gmt":"2014-08-08T07:28:05","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=740"},"modified":"2014-08-17T08:40:46","modified_gmt":"2014-08-17T08:40:46","slug":"triangle-dete","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/08\/08\/triangle-dete\/","title":{"rendered":"Le triangle d’\u00e9t\u00e9"},"content":{"rendered":"

L’\u00e9t\u00e9 est l’occasion de d\u00e9couvrir la Voie lact\u00e9e<\/a>, cette bande laiteuse qui traverse le ciel du nord au sud et qui repr\u00e9sente notre Galaxie vue par la tranche, le Syst\u00e8me solaire \u00e9tant situ\u00e9 \u00e0 la p\u00e9riph\u00e9rie de ce disque d’\u00e9toiles. Trois \u00e9toiles brillantes observables au z\u00e9nith en d\u00e9but de nuit forment le triangle d’\u00e9t\u00e9.<\/p>\n

\"triangle3\"<\/a><\/p>\n

Deneb est la plus brillante \u00e9toile de la constellation du Cygne (magnitude 1,25). C’est une superg\u00e9ante blanche de 110 rayons solaires, l’une des plus grosses \u00e9toiles connues. On estime sa distance \u00e0 1500 ann\u00e9es-lumi\u00e8re.<\/p>\n

V\u00e9ga, avec une magnitude de 0,03 est la cinqui\u00e8me \u00e9toile la plus brillante du ciel. Elle permet de rep\u00e9rer la discr\u00e8te constellation de la Lyre. En raison de la pr\u00e9cession des \u00e9quinoxes, V\u00e9ga \u00e9tait l’\u00e9toile polaire<\/a> il y a environ 14000 ans.<\/p>\n

Quant \u00e0 Alta\u00efr (magnitude 0,77) qui \u00e9tincelle dans la constellation de l’Aigle, c’est l’une des \u00e9toiles les plus proches visibles \u00e0 l’\u0153il nu puisqu’elle n’est qu’\u00e0 17 ann\u00e9es-lumi\u00e8re de la Terre. Alta\u00efr pr\u00e9sente la particularit\u00e9 de tourner tr\u00e8s rapidement sur elle-m\u00eame\u00a0: entre 6 et 10 heures, alors qu’il faut 25 jours au Soleil<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

L’\u00e9t\u00e9 est l’occasion de d\u00e9couvrir la Voie lact\u00e9e, cette bande laiteuse qui traverse le ciel du nord au sud et qui repr\u00e9sente notre Galaxie vue par la tranche, le Syst\u00e8me solaire \u00e9tant situ\u00e9 \u00e0 la p\u00e9riph\u00e9rie de ce disque d’\u00e9toiles. Trois \u00e9toiles brillantes observables au z\u00e9nith en d\u00e9but de nuit forment le triangle d’\u00e9t\u00e9. Deneb … Continuer la lecture de Le triangle d’\u00e9t\u00e9<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":742,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[313,279,130,314,103,102,101,310,89,98,112,192,312,311,100,166],"class_list":["post-740","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-altair","tag-annee-lumiere","tag-ciel","tag-constellation-de-laigle","tag-constellation-de-la-lyre","tag-constellation-du-cygne","tag-deneb","tag-ete","tag-etoile","tag-etoile-polaire","tag-galaxie","tag-magnitude","tag-precession-des-equinoxes","tag-supergeante","tag-vega","tag-voie-lactee"],"yoast_head":"\ntriangle ete<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/08\/08\/triangle-dete\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"triangle ete\" \/>\n<meta property=\"og:description\" content=\"L’\u00e9t\u00e9 est l’occasion de d\u00e9couvrir la Voie lact\u00e9e, cette bande laiteuse qui traverse le ciel du nord au sud et qui repr\u00e9sente notre Galaxie vue par la tranche, le Syst\u00e8me solaire \u00e9tant situ\u00e9 \u00e0 la p\u00e9riph\u00e9rie de ce disque d’\u00e9toiles. 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