{"id":9630,"date":"2018-09-15T20:36:39","date_gmt":"2018-09-15T20:36:39","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=9630"},"modified":"2018-10-07T07:56:58","modified_gmt":"2018-10-07T07:56:58","slug":"promenade-avec-un-telescope-sur-un-croissant-de-lune","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/09\/15\/promenade-avec-un-telescope-sur-un-croissant-de-lune\/","title":{"rendered":"Promenade avec un t\u00e9lescope sur un croissant de Lune"},"content":{"rendered":"

Un bo\u00eetier photographique fix\u00e9 derri\u00e8re un t\u00e9lescope permet de r\u00e9aliser facilement des images d\u00e9taill\u00e9es du croissant de Lune.\u00a0<\/strong><\/p>\n

Depuis l’invention du t\u00e9lescope \u00e0 miroir par Isaac Newton au XVII\u00e8me si\u00e8cle (1\/2 si\u00e8cle apr\u00e8s les premi\u00e8res observations \u00e0 la lunette astronomique r\u00e9alis\u00e9es par Galil\u00e9e<\/a>), le ciel nocturne n’a cess\u00e9 de nous r\u00e9v\u00e9ler sa beaut\u00e9 et sa complexit\u00e9. Si certains de ces instruments sont de v\u00e9ritables g\u00e9ants (\u00e0 l’image du Gran Tecan<\/a> dot\u00e9 d’un miroir de 10,40 m\u00e8tres de diam\u00e8tre), les petits t\u00e9lescopes pour amateurs ont eux aussi beaucoup \u00e9volu\u00e9 et permettent des observations qui auraient fait p\u00e2lir d’envie les astronomes des si\u00e8cles pr\u00e9c\u00e9dents.<\/p>\n

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

Parall\u00e8lement les progr\u00e8s de la photographie permettent d\u00e9sormais d’obtenir des clich\u00e9s spectaculaires du ciel avec des bo\u00eetiers grand public.<\/p>\n

L’image qui illustre cet article a \u00e9t\u00e9 r\u00e9alis\u00e9e dans la soir\u00e9e du 15 septembre alors que la Lune \u00e9tait \u00e2g\u00e9e de 6 jours. Un bo\u00eetier Nikon D3100 (pose de 1\/60\u00e8me de sec \u00e0 800 iso) a \u00e9t\u00e9 plac\u00e9 au foyer d’un Meade ETX 125, un t\u00e9lescope de 125 mm de diam\u00e8tre dot\u00e9 d’une focale de 1900 mm. Malgr\u00e9 cette longueur focale cet instrument est tr\u00e8s compact (le tube ne fait que 30 cm de long) car il est du type Maksutov-Cassegrain (c’est un t\u00e9lescope catadioptrique pourvu d’un miroir sph\u00e9rique et d’une lame \u00e0 l’avant, un m\u00e9nisque l\u00e9g\u00e8rement divergent destin\u00e9 \u00e0 corriger les aberrations optiques).<\/p>\n

\"\"<\/a>
T\u00e9lescope ETX-125 avec bo\u00eetier photo au foyer (focale de 1900 mm).<\/figcaption><\/figure>\n

Je vous laisse vous promener sur l’image originale ou sur sa version annot\u00e9e (le clich\u00e9 a \u00e9t\u00e9 volontairement tourn\u00e9 de 90\u00b0 dans le sens inverse des aiguilles d’une montre pour un affichage optimal au format de l’\u00e9cran d’ordinateur)<\/p>\n

\"\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Un bo\u00eetier photographique fix\u00e9 derri\u00e8re un t\u00e9lescope permet de r\u00e9aliser facilement des images d\u00e9taill\u00e9es du croissant de Lune.\u00a0 Depuis l’invention du t\u00e9lescope \u00e0 miroir par Isaac Newton au XVII\u00e8me si\u00e8cle (1\/2 si\u00e8cle apr\u00e8s les premi\u00e8res observations \u00e0 la lunette astronomique r\u00e9alis\u00e9es par Galil\u00e9e), le ciel nocturne n’a cess\u00e9 de nous r\u00e9v\u00e9ler sa beaut\u00e9 et sa … Continuer la lecture de Promenade avec un t\u00e9lescope sur un croissant de Lune<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":9631,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[83],"tags":[131,2567,158,696,96],"class_list":["post-9630","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-la-lune","tag-croissant-de-lune","tag-etx-125mm","tag-galilee","tag-isaac-newton","tag-telescope"],"yoast_head":"\nPromenade avec un t\u00e9lescope sur un croissant de Lune<\/title>\n<meta name=\"description\" content=\"Un bo\u00eetier photographique fix\u00e9 derri\u00e8re un t\u00e9lescope permet de r\u00e9aliser facilement des images d\u00e9taill\u00e9es du croissant de Lune.\u00a0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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