{"id":1954,"date":"2015-02-20T06:01:16","date_gmt":"2015-02-20T06:01:16","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1954"},"modified":"2015-02-27T06:05:53","modified_gmt":"2015-02-27T06:05:53","slug":"un-minuscule-croissant-lunaire-age-de-18-heures","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/20\/un-minuscule-croissant-lunaire-age-de-18-heures\/","title":{"rendered":"Un minuscule croissant lunaire \u00e2g\u00e9 de 18 heures"},"content":{"rendered":"

La chasse aux tr\u00e8s fins croissants de Lune<\/a> est un v\u00e9ritable d\u00e9fi pour les astrophotographes. Ils doivent r\u00e9unir plusieurs conditions : un ciel tr\u00e8s pur, un angle maximal entre l’\u00e9cliptique et l’horizon (en automne le matin avant la Nouvelle Lune et au printemps le soir apr\u00e8s la Nouvelle Lune) et un diam\u00e8tre apparent le plus important possible pour notre satellite naturel (qui doit \u00eatre tr\u00e8s proche de son p\u00e9rig\u00e9e).<\/p>\n

\"croissant-lune2\"<\/a><\/p>\n

Ces conditions \u00e9taient r\u00e9unies hier soir avec une absence totale de brume dans le ciel bourguignon et un diam\u00e8tre apparent de S\u00e9l\u00e9n\u00e9 sup\u00e9rieur \u00e0 33 minutes d’arc.<\/p>\n

18 heures seulement apr\u00e8s la Nouvelle Lune, j’ai d\u00e9couvert dans ma paire de jumelles le minuscule croissant de Lune dans les lumi\u00e8res du couchant et je suis arriv\u00e9 \u00e0 l’immortaliser avec un bo\u00eetier Finepix HS20 et son zoom r\u00e9gl\u00e9 sur 500 mm de focale.<\/p>\n

Record largement battu apr\u00e8s un croissant de 28 heures<\/a> saisi le 23 novembre dernier ; sur la photographie ci-dessus, le croissant repr\u00e9sente 0,9% seulement de la surface lunaire !<\/p>\n","protected":false},"excerpt":{"rendered":"

La chasse aux tr\u00e8s fins croissants de Lune est un v\u00e9ritable d\u00e9fi pour les astrophotographes. Ils doivent r\u00e9unir plusieurs conditions : un ciel tr\u00e8s pur, un angle maximal entre l’\u00e9cliptique et l’horizon (en automne le matin avant la Nouvelle Lune et au printemps le soir apr\u00e8s la Nouvelle Lune) et un diam\u00e8tre apparent le plus … Continuer la lecture de Un minuscule croissant lunaire \u00e2g\u00e9 de 18 heures<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":1955,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[83],"tags":[131,326,299,161,451,117],"class_list":["post-1954","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-la-lune","tag-croissant-de-lune","tag-ecliptique","tag-minute-darc","tag-nouvelle-lune","tag-paire-de-jumelles","tag-perigee"],"yoast_head":"\nUn minuscule croissant lunaire \u00e2g\u00e9 de 18 heures<\/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\/2015\/02\/20\/un-minuscule-croissant-lunaire-age-de-18-heures\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Un minuscule croissant lunaire \u00e2g\u00e9 de 18 heures\" \/>\n<meta property=\"og:description\" content=\"La chasse aux tr\u00e8s fins croissants de Lune est un v\u00e9ritable d\u00e9fi pour les astrophotographes. 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