{"id":5316,"date":"2016-03-18T06:00:58","date_gmt":"2016-03-18T06:00:58","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=5316"},"modified":"2016-03-24T06:05:44","modified_gmt":"2016-03-24T06:05:44","slug":"17-mars-la-lune-glisse-sous-castor-et-pollux","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/03\/18\/17-mars-la-lune-glisse-sous-castor-et-pollux\/","title":{"rendered":"17 mars : la Lune glisse sous Castor et Pollux"},"content":{"rendered":"

Une soir\u00e9e presque ordinaire au ch\u00e2teau de la Tour en Bourgogne : la Lune passe dans la constellation des G\u00e9meaux sous les \u00e9toiles Castor et Pollux.<\/strong><\/p>\n

Deux jours apr\u00e8s le Premier Quartier<\/a>, c’est une Lune d\u00e9j\u00e0 bien brillante qui culminait dans la soir\u00e9e printani\u00e8re du 17 mars. On pouvait observer juste au-dessus les c\u00e9l\u00e8bres \u00e9toiles Castor et Pollux. Ces\u00a0deux \u00e9toiles sont \u00e0 l’origine du nom de la constellation des G\u00e9meaux<\/a> (Gemini<\/em> signifie \u00ab jumeaux \u00bb en latin) mais ces jumelles ne se ressemblent pas vraiment.<\/p>\n

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

L’astronome britannique James Bradley a \u00e9t\u00e9 le premier \u00e0 remarquer en 1719 que Castor \u00e9tait une binaire visuelle blanche et chaude distante de presque 50 ann\u00e9es-lumi\u00e8re. On a depuis d\u00e9couvert que chacune des composantes de Castor \u00e9tait en fait un couple stellaire, faisant de Castor un syst\u00e8me d’\u00e9toiles quadruple.<\/p>\n

Quant \u00e0 Pollux c’est une g\u00e9ante jaune-orange plus froide situ\u00e9e \u00e0 34 ann\u00e9es-lumi\u00e8re. Pollux est \u00e9galement la plus brillante \u00e9toile connue \u00e0 poss\u00e9der une exoplan\u00e8te<\/a>, Pollux b, dont la masse \u00e9quivaut \u00e0 un peu plus de 2 fois celle de Jupiter<\/a>, et qui tourne autour de Pollux en moins de 600 jours.<\/p>\n

Cette photographie a \u00e9t\u00e9 prise au pied du ch\u00e2teau de la Tour, un monument qui \u00a0figurait d\u00e9j\u00e0 au premier plan sur une de mes images de rotation d’\u00e9toiles<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Une soir\u00e9e presque ordinaire au ch\u00e2teau de la Tour en Bourgogne : la Lune passe dans la constellation des G\u00e9meaux sous les \u00e9toiles Castor et Pollux. Deux jours apr\u00e8s le Premier Quartier, c’est une Lune d\u00e9j\u00e0 bien brillante qui culminait dans la soir\u00e9e printani\u00e8re du 17 mars. On pouvait observer juste au-dessus les c\u00e9l\u00e8bres \u00e9toiles … Continuer la lecture de 17 mars : la Lune glisse sous Castor et Pollux<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":5317,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[83],"tags":[156,762,91,82,157],"class_list":["post-5316","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-la-lune","tag-castor","tag-chateau-de-la-tour","tag-constellation-des-gemeaux","tag-lune","tag-pollux"],"yoast_head":"\n17 mars : la Lune glisse sous Castor et Pollux<\/title>\n<meta name=\"description\" content=\"Une soir\u00e9e presque ordinaire au Ch\u00e2teau de la Tour en Bourgogne : la Lune passe dans la constellation des G\u00e9meaux sous les \u00e9toiles Castor et Pollux.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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