{"id":7798,"date":"2017-04-29T07:41:28","date_gmt":"2017-04-29T07:41:28","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7798"},"modified":"2017-05-09T16:44:34","modified_gmt":"2017-05-09T16:44:34","slug":"lumiere-cendree-aux-cotes-de-letoile-aldebaran","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/04\/29\/lumiere-cendree-aux-cotes-de-letoile-aldebaran\/","title":{"rendered":"La lumi\u00e8re cendr\u00e9e aux c\u00f4t\u00e9s de l’\u00e9toile Ald\u00e9baran"},"content":{"rendered":"

Vendredi soir 28 avril la jeune Lune et sa lumi\u00e8re cendr\u00e9e glissaient doucement devant l’amas des Hyades, non loin de la brillante Ald\u00e9baran.<\/strong><\/p>\n

Avez-vous d\u00e9j\u00e0 entendu parler de la lumi\u00e8re cendr\u00e9e ? Cette douce clart\u00e9<\/a>, environ 10.000 fois plus faible que la Pleine Lune<\/a>, permet de distinguer le reste du disque lunaire juste avant ou apr\u00e8s la Nouvelle Lune, quand le croissant est assez fin pour ne pas trop nous \u00e9blouir.\u00a0Alors que ce croissant re\u00e7oit directement les rayons solaires, le reste de la surface lunaire est tr\u00e8s l\u00e9g\u00e8rement \u00e9clair\u00e9 par la lumi\u00e8re solaire que la Terre renvoie dans l\u2019espace (les oc\u00e9ans et les nuages terrestres jouent un peu un r\u00f4le de miroir). Le disque lunaire semble gris clair comme de la cendre, ce qui explique le nom de lumi\u00e8re cendr\u00e9e.<\/p>\n

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

Pour bien voir la lumi\u00e8re cendr\u00e9e il est n\u00e9cessaire de faire une pose photographique assez longue : cette image repr\u00e9sente 6 sec de pose \u00e0 400 iso avec un objectif de 200 mm de focale (ouverture 7,1), le bo\u00eetier \u00e9tant install\u00e9 sur une monture \u00e9quatoriale motoris\u00e9e pour compenser la rotation de la Terre.<\/p>\n

M\u00eame si l\u2019amas des Hyades<\/a> compte environ dix fois moins d\u2019\u00e9toiles que Messier 45, le c\u00e9l\u00e8bre amas des Pl\u00e9iades<\/a>, il est \u00e9galement tr\u00e8s int\u00e9ressant \u00e0 observer car c\u2019est l\u2019amas ouvert le plus proche du Syst\u00e8me solaire (150 ann\u00e9es-lumi\u00e8re). Les astrophysiciens ont remarqu\u00e9 que les \u00e9toiles des Hyades et de l\u2019amas de la Cr\u00e8che (M 44<\/a>), ont des caract\u00e9ristiques communes, preuve qu\u2019elles sont n\u00e9es dans la m\u00eame r\u00e9gion de notre Galaxie<\/a>.<\/p>\n

Curieusement, l\u2019\u00e9toile la plus brillante des Hyades, Ald\u00e9baran<\/a> (qui repr\u00e9sente l\u2019\u0153il du Taureau), est deux fois plus proche de nous et ne fait donc pas partie de l\u2019amas. C’est elle qui brille \u00e0 droite du croissant de Lune, les autres \u00e9toiles faisant partie de l’amas des Hyades.<\/p>\n","protected":false},"excerpt":{"rendered":"

Vendredi soir 28 avril la jeune Lune et sa lumi\u00e8re cendr\u00e9e glissaient doucement devant l’amas des Hyades, non loin de la brillante Ald\u00e9baran. Avez-vous d\u00e9j\u00e0 entendu parler de la lumi\u00e8re cendr\u00e9e ? Cette douce clart\u00e9, environ 10.000 fois plus faible que la Pleine Lune, permet de distinguer le reste du disque lunaire juste avant ou … Continuer la lecture de La lumi\u00e8re cendr\u00e9e aux c\u00f4t\u00e9s de l’\u00e9toile Ald\u00e9baran<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":7799,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[83],"tags":[373,863,88],"class_list":["post-7798","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-la-lune","tag-aldebaran","tag-amas-des-hyades","tag-lumiere-cendree"],"yoast_head":"\nLa lumi\u00e8re cendr\u00e9e aux c\u00f4t\u00e9s de l'\u00e9toile Ald\u00e9baran<\/title>\n<meta name=\"description\" content=\"Vendredi soir 28 avril la jeune Lune et sa lumi\u00e8re cendr\u00e9e glissaient doucement devant l'amas des Hyades, non loin de la brillante 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