{"id":5041,"date":"2016-02-16T14:53:35","date_gmt":"2016-02-16T14:53:35","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=5041"},"modified":"2016-02-25T06:03:22","modified_gmt":"2016-02-25T06:03:22","slug":"partez-a-la-decouverte-du-triangle-dhiver","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/02\/16\/partez-a-la-decouverte-du-triangle-dhiver\/","title":{"rendered":"Partez \u00e0 la d\u00e9couverte du Triangle d’hiver"},"content":{"rendered":"

Les soir\u00e9es du mois de f\u00e9vrier sont l’occasion de d\u00e9couvrir le Triangle d’hiver et ses trois \u00e9toiles : Procyon, B\u00e9telgeuse et Sirius.<\/strong><\/p>\n

\u00c0 chaque saison correspondent des rep\u00e8res c\u00e9lestes destin\u00e9s \u00e0 cheminer au milieu des \u00e9toiles \u00e0 la d\u00e9couverte des constellations. Le Triangle d’\u00e9t\u00e9<\/a> form\u00e9 des trois \u00e9toiles brillantes Deneb-V\u00e9ga-Alta\u00efr permet de nous guider dans la Voie lact\u00e9e<\/a> pendant les douces nuits des mois de juillet et ao\u00fbt. Les froides nuits des semaines de janvier-f\u00e9vrier ce sont les \u00e9toiles Procyon, B\u00e9telgeuse et Sirius qui vont nous accompagner.<\/p>\n

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

Procyon (Alpha Canis Minoris<\/em>) est l’\u00e9toile la plus brillante de la constellation du Petit Chien et la septi\u00e8me plus brillante du ciel nocturne. C’est\u00a0\u00e9galement l’une des \u00e9toiles les plus proches de la Terre puisqu’elle se situe \u00e0 seulement 11,4 ann\u00e9es-lumi\u00e8re. Procyon est en r\u00e9alit\u00e9 une \u00e9toile double (une naine blanche de faible luminosit\u00e9, Procyon B, orbite autour de l’astre principal, Procyon A).<\/p>\n

B\u00e9telgeuse (Alpha Orionis<\/em>) est la neuvi\u00e8me plus brillante \u00e9toile du ciel. Elle marque la position de l’\u00e9paule gauche du chasseur Orion<\/a>. En \u00e9tudiant des images prises par le t\u00e9lescope spatial Herschel, les scientifiques pensent que cette superg\u00e9ante rouge (la plus proche de la Terre) entrera en collision dans 5.000 ans avec un myst\u00e9rieux mur de poussi\u00e8re qui pourrait mat\u00e9rialiser la bordure d’un nuage interstellaire.<\/p>\n

Sirius <\/a>(Alpha Canis Majoris<\/em>) est la plus brillante \u00e9toile du ciel apr\u00e8s le Soleil<\/a>.\u00a0Situ\u00e9e\u00a0\u00e0 seulement 8,6 ann\u00e9es-lumi\u00e8re du Soleil, Sirius est anim\u00e9e d’un mouvement propre important qui la fait se diriger vers notre \u00e9toile \u00e0 la vitesse de 7,6 km\/s. Ce mouvement a \u00e9t\u00e9 mis en \u00e9vidence pour la premi\u00e8re fois par l’astronome britannique Edmund Halley (celui qui donna son nom \u00e0 la plus c\u00e9l\u00e8bre des com\u00e8tes) en comparant la position de Sirius au XVIIIe si\u00e8cle par rapport \u00e0 celle que donnait l’astronome grec Hipparque dans l’Antiquit\u00e9.<\/p>\n

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

L’image plus haut, r\u00e9alis\u00e9e dans la nuit du 14 au 15 f\u00e9vrier, montre le Triangle d’hiver encadr\u00e9 \u00e0 l’EST par Jupiter <\/a>et \u00e0 l’OUEST par la Lune quelques heures avant le Premier Quartier<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Les soir\u00e9es du mois de f\u00e9vrier sont l’occasion de d\u00e9couvrir le Triangle d’hiver et ses trois \u00e9toiles : Procyon, B\u00e9telgeuse et Sirius. \u00c0 chaque saison correspondent des rep\u00e8res c\u00e9lestes destin\u00e9s \u00e0 cheminer au milieu des \u00e9toiles \u00e0 la d\u00e9couverte des constellations. Le Triangle d’\u00e9t\u00e9 form\u00e9 des trois \u00e9toiles brillantes Deneb-V\u00e9ga-Alta\u00efr permet de nous guider dans … Continuer la lecture de Partez \u00e0 la d\u00e9couverte du Triangle d’hiver<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":5042,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[344,90,121,439,410,1510,166],"class_list":["post-5041","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-betelgeuse","tag-jupiter","tag-premier-quartier","tag-procyon","tag-sirius","tag-triangle-dhiver","tag-voie-lactee"],"yoast_head":"\nPartez \u00e0 la d\u00e9couverte du Triangle d'hiver<\/title>\n<meta name=\"description\" content=\"Les soir\u00e9es du mois de f\u00e9vrier sont l'occasion de d\u00e9couvrir le Triangle d'hiver et ses trois \u00e9toiles : 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