{"id":5361,"date":"2016-03-24T12:51:11","date_gmt":"2016-03-24T12:51:11","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=5361"},"modified":"2016-04-01T16:01:29","modified_gmt":"2016-04-01T16:01:29","slug":"sonde-dawn-zoome-letrange-cratere-occator","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/03\/24\/sonde-dawn-zoome-letrange-cratere-occator\/","title":{"rendered":"La sonde Dawn zoome sur l&#8217;\u00e9trange crat\u00e8re Occator"},"content":{"rendered":"<p><strong>En combinant plusieurs images prises par la sonde Dawn, la NASA a cr\u00e9\u00e9 une image d\u00e9taill\u00e9e en couleurs du d\u00f4me brillant situ\u00e9 au centre du crat\u00e8re Occator.<\/strong><\/p>\n<p>Parmi les nombreuses interrogations soulev\u00e9es lors du survol de C\u00e9r\u00e8s par la sonde <a href=\"http:\/\/dawn.jpl.nasa.gov\/\" target=\"_blank\">Dawn<\/a>, la pr\u00e9sence de 130 points lumineux sur la plan\u00e8te naine continue d&#8217;intriguer les plan\u00e9tologues. Un grand nombre de ces taches brillantes (qui sont peut-\u00eatre des d\u00e9p\u00f4ts de sulfate de magn\u00e9sium hydrat\u00e9 signant la pr\u00e9sence d\u2019eau \u00e0 une p\u00e9riode g\u00e9ologique proche) occupent le fond du crat\u00e8re Occator, une excavation de 92 km de diam\u00e8tre et 4 km de profondeur.<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" frameborder=\"0\" width=\"480\" height=\"270\" src=\"\/\/www.dailymotion.com\/embed\/video\/x3pyzjn\" 0=\"allowfullscreen&gt;&lt;\/iframe\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<p style=\"text-align: center\"><strong>En vid\u00e9o : un survol d\u00e9taill\u00e9 et en couleurs de la surface de C\u00e9r\u00e8s\u00a0<\/strong><\/p>\n<p>L&#8217;image ci-dessous propos\u00e9e par la <a href=\"http:\/\/www.nasa.gov\/image-feature\/jpl\/center-of-occator-crater-enhanced-color\" target=\"_blank\">NASA <\/a>a \u00e9t\u00e9 obtenue en combinant diff\u00e9rentes photographies r\u00e9alis\u00e9es par l&#8217;orbiteur Dawn\u00a0: des clich\u00e9s datant de f\u00e9vrier dernier avec une r\u00e9solution de 35 m par pixel et d&#8217;autres pris en couleurs (avec des filtres centr\u00e9s sur 438, 550 et 965 nanom\u00e8tres) en septembre 2015 (r\u00e9solution de 135 m par pixel). Les couleurs ont \u00e9t\u00e9 renforc\u00e9es pour mettre en \u00e9vidence de subtiles diff\u00e9rences de teintes. On remarque que le centre du crat\u00e8re Occator est occup\u00e9 par un d\u00f4me recouvert d&#8217;un mat\u00e9riau lumineux parcouru par de nombreuses crevasses qui partent du sommet.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/03\/occator.jpg\"  rel=\"lightbox[5361] attachment wp-att-5362\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-5362\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/03\/occator-450x307.jpg\" alt=\"occator\" width=\"450\" height=\"307\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/03\/occator-450x307.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/03\/occator-768x524.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/03\/occator-1024x699.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/03\/occator.jpg 1271w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p><!--more--><\/p>\n<p>Depuis mars 2015 la sonde Dawn est en orbite autour de la plan\u00e8te naine C\u00e9r\u00e8s.\u00a0\u00c0 la mi-d\u00e9cembre elle s&#8217;est plac\u00e9e sur son orbite d\u00e9finitive \u00e0 seulement 380 kilom\u00e8tres de la surface.<\/p>\n<p>En 12 mois l&#8217;orbiteur a pris des milliers de clich\u00e9s qui ont permis de r\u00e9aliser une cartographie compl\u00e8te de la surface de la plan\u00e8te naine, surface aussi sombre que de l\u2019asphalte mis \u00e0 part les zones lumineuses qui fascinent les scientifiques depuis leur d\u00e9couverte (le <a href=\"http:\/\/hubblesite.org\/gallery\/album\/entire\/pr2005027a\/\" target=\"_blank\">t\u00e9lescope Hubble<\/a> en avait d\u00e9j\u00e0 rep\u00e9r\u00e9 deux en 2003).<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>En combinant plusieurs images prises par la sonde Dawn, la NASA a cr\u00e9\u00e9 une image d\u00e9taill\u00e9e en couleurs du d\u00f4me brillant situ\u00e9 au centre du crat\u00e8re Occator. Parmi les nombreuses interrogations soulev\u00e9es lors du survol de C\u00e9r\u00e8s par la sonde Dawn, la pr\u00e9sence de 130 points lumineux sur la plan\u00e8te naine continue d&#8217;intriguer les plan\u00e9tologues. &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/03\/24\/sonde-dawn-zoome-letrange-cratere-occator\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La sonde Dawn zoome sur l&#8217;\u00e9trange crat\u00e8re Occator<\/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":5362,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[549,486,1479,627,550,734],"class_list":["post-5361","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-ceres","tag-nasa","tag-occator","tag-planete-naine","tag-sonde-dawn","tag-telescope-hubble"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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