{"id":3565,"date":"2015-09-10T04:24:16","date_gmt":"2015-09-10T04:24:16","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=3565"},"modified":"2015-09-17T04:58:11","modified_gmt":"2015-09-17T04:58:11","slug":"course-celeste-entre-le-croissant-de-lune-et-venus","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/09\/10\/course-celeste-entre-le-croissant-de-lune-et-venus\/","title":{"rendered":"Course c\u00e9leste entre le croissant de Lune et V\u00e9nus"},"content":{"rendered":"

Le 9 septembre avant l’aube le croissant de Lune et la plan\u00e8te V\u00e9nus faisaient la course au milieu des \u00e9toiles apr\u00e8s une nuit particuli\u00e8rement pure.<\/strong><\/p>\n

Les excellentes conditions m\u00e9t\u00e9orologiques de ce d\u00e9but du mois de septembre permettent \u00e0 chacun de profiter des beaut\u00e9s du ciel nocturne. Les plus brillantes des plan\u00e8tes (V\u00e9nus et Jupiter) ayant d\u00e9sert\u00e9 le ciel du soir, il est n\u00e9cessaire de faire sonner son r\u00e9veil en fin de nuit pour pouvoir les admirer avant l’aube.<\/p>\n

\"lune_venus1\"<\/a><\/p>\n

Pour le moment seule V\u00e9nus<\/a> a retrouv\u00e9 de bonnes conditions de visibilit\u00e9, se levant 2 h avant le Soleil<\/a>. Mars <\/a>n’est pas tr\u00e8s loin mais brille d’un \u00e9clat beaucoup plus modeste. Quant \u00e0 Jupiter <\/a>elle devrait commencer \u00e0 redevenir visible au ras de l’horizon est d’ici quelques jours, le temps de s’\u00e9carter un peu du Soleil.<\/p>\n

Le 9 septembre j’ai pu saisir la beaut\u00e9 du ciel avant l’aube depuis les vignes qui entourent le ch\u00e2teau de la Tour<\/a>, non loin du c\u00e9l\u00e8bre ch\u00e2teau du Clos de Vougeot<\/a> (cette r\u00e9gion viticole est d\u00e9sormais class\u00e9e au patrimoine mondial de l’UNESCO<\/a>).<\/p>\n

L’image ci-dessus montre le d\u00e9placement des astres pendant environ une heure : il s’agit de l’addition de 110 poses successives de 30 sec \u00e0 200 iso avec une focale de 35 mm, plus une pose courte (5 sec) un peu plus tard pour bien visualiser chaque astre. La trace la plus large est celle du vieux croissant de Lune<\/a> (la Nouvelle Lune aura lieu le 13 septembre) accompagn\u00e9 par la lumi\u00e8re cendr\u00e9e<\/a>. Le point brillant juste \u00e0 droite de la tour est celui de V\u00e9nus, Mars se trouvant au m\u00eame niveau \u00e0 gauche de la tour. Toutes les autres traces ont \u00e9t\u00e9 provoqu\u00e9es par des \u00e9toiles<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Le 9 septembre avant l’aube le croissant de Lune et la plan\u00e8te V\u00e9nus faisaient la course au milieu des \u00e9toiles apr\u00e8s une nuit particuli\u00e8rement pure. Les excellentes conditions m\u00e9t\u00e9orologiques de ce d\u00e9but du mois de septembre permettent \u00e0 chacun de profiter des beaut\u00e9s du ciel nocturne. Les plus brillantes des plan\u00e8tes (V\u00e9nus et Jupiter) ayant … Continuer la lecture de Course c\u00e9leste entre le croissant de Lune et V\u00e9nus<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":3566,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[83],"tags":[762,1207,131,116,114,1085,159],"class_list":["post-3565","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-la-lune","tag-chateau-de-la-tour","tag-chateau-du-clos-de-vougeot","tag-croissant-de-lune","tag-mars","tag-planete","tag-unesco","tag-venus"],"yoast_head":"\nCourse c\u00e9leste entre le croissant de Lune et V\u00e9nus<\/title>\n<meta name=\"description\" content=\"Le 9 septembre avant l'aube le croissant de Lune et la plan\u00e8te V\u00e9nus faisaient la course au milieu des \u00e9toiles apr\u00e8s une nuit 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