{"id":4677,"date":"2016-02-02T05:42:34","date_gmt":"2016-02-02T05:42:34","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=4677"},"modified":"2016-02-09T16:18:43","modified_gmt":"2016-02-09T16:18:43","slug":"site-very-large-telescope-chili-de-satellite","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/02\/02\/site-very-large-telescope-chili-de-satellite\/","title":{"rendered":"Le site du Very Large Telescope au Chili vu de satellite"},"content":{"rendered":"

L’un des satellites Pl\u00e9iades a photographi\u00e9 les 4 coupoles du Very Large Telescope, le fleuron de l’ESO implant\u00e9 dans les Andes Chiliennes.<\/strong><\/p>\n

C’est depuis le centre spatial guyanais qu’ont \u00e9t\u00e9 lanc\u00e9s les satellites Pl\u00e9iades 1A en d\u00e9cembre 2011 et Pl\u00e9iades 1B un an plus tard. Ces deux satellites, construits dans le cadre du programme franco-italien Orf\u00e9o (Optical and Radar Federated Earth Observation<\/em>), sont capables de r\u00e9aliser chacun 500 images par jour gr\u00e2ce \u00e0 un d\u00e9tecteur tr\u00e8s sensible permettant de r\u00e9duire les temps d’exposition. Ils observent la Terre \u00e0 des fins civiles ou militaires depuis une orbite h\u00e9liosynchrone basse (694 km d’altitude), venant ainsi compl\u00e9ter avec une meilleure r\u00e9solution le travail des satellites Spot.<\/p>\n

\"vlt2\"<\/a><\/p>\n

L’image ci-dessus, propos\u00e9e par le CNES<\/a>, a \u00e9t\u00e9\u00a0 acquise en 2013. Elle r\u00e9v\u00e8le l’un des sites les plus embl\u00e9matiques de l’ESO<\/a>, le Very Large Telescope<\/em>.<\/p>\n

Les 4 t\u00e9lescopes qui composent le VLT<\/a>, \u00e9quip\u00e9s de miroirs primaires de 8,2 m\u00e8tres de diam\u00e8tre, sont naturellement destin\u00e9s \u00e0 \u00eatre point\u00e9s vers le ciel mais pour une fois c’est depuis le ciel qu’ils sont photographi\u00e9s.<\/p>\n

Chacun de ces t\u00e9lescopes peut travailler seul, mais on peut aussi les associer \u00e0 4 autres t\u00e9lescopes plus petits (1,8 m\u00e8tre) et mobiles (ils circulent sur des rails, les bandes blanches visibles \u00ab\u00a0sous\u00a0\u00bb les coupoles). Cette configuration permet de r\u00e9aliser un interf\u00e9rom\u00e8tre g\u00e9ant, le VLTI<\/a>, capable d\u2019offrir des vues de l\u2019Univers 25 fois plus pr\u00e9cises qu\u2019avec un seul des t\u00e9lescopes. L’ensemble est install\u00e9 sur le Cerro Paranal, un sommet dans le d\u00e9sert chilien de l\u2019Atacama<\/a> qui a \u00e9t\u00e9 aras\u00e9 pour y construire cet observatoire.<\/p>\n

Apr\u00e8s l’insolite survol du VLT par un drone<\/a>, une vision qui nous avait \u00e9t\u00e9 offerte par l’ESO il y a quelques mois, voil\u00e0 une autre fa\u00e7on de regarder cet observatoire de haut\u00a0!<\/p>\n","protected":false},"excerpt":{"rendered":"

L’un des satellites Pl\u00e9iades a photographi\u00e9 les 4 coupoles du Very Large Telescope, le fleuron de l’ESO implant\u00e9 dans les Andes Chiliennes. C’est depuis le centre spatial guyanais qu’ont \u00e9t\u00e9 lanc\u00e9s les satellites Pl\u00e9iades 1A en d\u00e9cembre 2011 et Pl\u00e9iades 1B un an plus tard. Ces deux satellites, construits dans le cadre du programme franco-italien … Continuer la lecture de Le site du Very Large Telescope au Chili vu de satellite<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":4678,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[1444,1098,634,633,637,1223],"class_list":["post-4677","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-cerro-paranal","tag-cnes","tag-desert-datacama","tag-eso","tag-vlt","tag-vlti"],"yoast_head":"\nLe site du Very Large Telescope au Chili vu de satellite<\/title>\n<meta name=\"description\" content=\"L'un des satellites Pl\u00e9iades a photographi\u00e9 les 4 coupoles du Verry Large Telescope, le fleuron de l'ESO implant\u00e9 dans les Andes Chiliennes.\" \/>\n<meta name=\"robots\" content=\"index, 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