{"id":8811,"date":"2018-02-07T16:11:04","date_gmt":"2018-02-07T16:11:04","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=8811"},"modified":"2018-02-16T09:31:56","modified_gmt":"2018-02-16T09:31:56","slug":"video-lsst-large-synoptic-survey-telescope","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/02\/07\/video-lsst-large-synoptic-survey-telescope\/","title":{"rendered":"En vid\u00e9o : le LSST (Large Synoptic Survey Telescope)"},"content":{"rendered":"<p><strong>Le LSST (<em>Large Synoptic Survey Telescope<\/em>) sera l&#8217;un des t\u00e9lescopes les plus puissants du monde dans les ann\u00e9es 2020. Pr\u00e9sentation en vid\u00e9o.<\/strong><\/p>\n<p>Les chiffres annonc\u00e9s pour le LSST donnent le vertige\u00a0: ce t\u00e9lescope de 8,4 m\u00e8tres de diam\u00e8tre (actuellement en construction au Chili), \u00e9quip\u00e9 de la plus puissante cam\u00e9ra num\u00e9rique jamais r\u00e9alis\u00e9e, devrait \u00eatre capable de photographier la totalit\u00e9 du ciel visible de l&#8217;h\u00e9misph\u00e8re sud en seulement 3 nuits en prenant une image de 9,6 degr\u00e9s carr\u00e9s (soit 47 fois la taille de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/11\/04\/pleine-lune-chasseurs-chateau-de-tour\/\" target=\"_blank\" rel=\"noopener\">Pleine Lune<\/a>) toutes les 20 secondes\u00a0!<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/4UzwQYi9mx8\" frameborder=\"0\" allow=\"autoplay; encrypted-media\" 0=\"allowfullscreen&gt;&lt;\/iframe\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<p>Chaque portion du ciel sera observ\u00e9e en moyenne 80 fois par an pendant 10 ans, \u00e0 raison de 30 t\u00e9raoctets de donn\u00e9es collect\u00e9es chaque nuit. Cette vid\u00e9o de <a href=\"https:\/\/www.youtube.com\/user\/doyeng1000\" target=\"_blank\" rel=\"noopener\">Guillaume Doyen<\/a> nous permet de d\u00e9couvrir cet incroyable t\u00e9lescope.\u00a0<!--more--><\/p>\n<p>Au bout d&#8217;une d\u00e9cennie le volume de la base de donn\u00e9es du LSST d\u00e9passera 200 p\u00e9taoctets, ce qui repr\u00e9sente des informations concernant 20 milliards de galaxies, 17 milliards d&#8217;\u00e9toiles, et leurs \u00e9ventuelles modifications durant cette p\u00e9riode.<\/p>\n<p>Pour atteindre un tel niveau de performances, le LSST dispose de trois atout\u00a0:<\/p>\n<ul>\n<li>le site retenu\u00a0: ce nouvel observatoire sera implant\u00e9 \u00e0 2.700 m\u00e8tres d&#8217;altitude au sommet du Cerro Pach\u00f3n dans les Andes chiliennes, l&#8217;un des meilleurs sites astronomiques de la plan\u00e8te qui accueille d\u00e9j\u00e0 de nombreux instruments comme le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/01\/17\/vlt-observatoire-desert-atacama\/\" target=\"_blank\" rel=\"noopener\">VLT<\/a> ou <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/11\/14\/antennes-dalma-vert-voie-lactee\/\" target=\"_blank\" rel=\"noopener\">ALMA<\/a>.<\/li>\n<li>l&#8217;instrument\u00a0: le LSST est un t\u00e9lescope dot\u00e9 de 3 miroirs : un miroir primaire de 8,4 m\u00e8tres de diam\u00e8tre, un miroir secondaire de 3,4 m (le plus grand miroir convexe jamais construit) et un miroir tertiaire de 5 m au centre du miroir primaire. C&#8217;est ce montage optique particulier qui va permettre d&#8217;observer d&#8217;un seul coup un champ de 9,6 degr\u00e9s carr\u00e9s. Un syst\u00e8me d&#8217;optique active corrigera les d\u00e9formations des miroirs. La monture du t\u00e9lescope permettra un pointage tr\u00e8s rapide (5 secondes) des cibles \u00e0 photographier.<\/li>\n<li>la\u00a0cam\u00e9ra : ce sera la plus grande jamais r\u00e9alis\u00e9e \u00e0 ce jour avec 3,2 milliards de pixels et un temps de lecture tr\u00e8s rapide de deux secondes. Gr\u00e2ce \u00e0 sa participation \u00e0 la construction de cette cam\u00e9ra, la France aura acc\u00e8s \u00e0 l&#8217;ensemble des observations du LSST et prendra en charge la moiti\u00e9 du traitement des donn\u00e9es du t\u00e9lescope.<\/li>\n<\/ul>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Le LSST (Large Synoptic Survey Telescope) sera l&#8217;un des t\u00e9lescopes les plus puissants du monde dans les ann\u00e9es 2020. Pr\u00e9sentation en vid\u00e9o. Les chiffres annonc\u00e9s pour le LSST donnent le vertige\u00a0: ce t\u00e9lescope de 8,4 m\u00e8tres de diam\u00e8tre (actuellement en construction au Chili), \u00e9quip\u00e9 de la plus puissante cam\u00e9ra num\u00e9rique jamais r\u00e9alis\u00e9e, devrait \u00eatre capable &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/02\/07\/video-lsst-large-synoptic-survey-telescope\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">En vid\u00e9o : le LSST (Large Synoptic Survey Telescope)<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":8812,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[1048,2440,635,1005,2439,637],"class_list":["post-8811","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-alma","tag-cerro-pachon","tag-chili","tag-guillaume-doyen","tag-lsst","tag-vlt"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>En vid\u00e9o : le LSST (Large Synoptic Survey Telescope)<\/title>\n<meta name=\"description\" content=\"Le LSST (Large Synoptic Survey Telescope) sera l&#039;un des t\u00e9lescopes les plus puissants du monde dans les ann\u00e9es 2020. 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