{"id":7087,"date":"2017-01-09T15:59:56","date_gmt":"2017-01-09T15:59:56","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7087"},"modified":"2017-01-18T08:54:10","modified_gmt":"2017-01-18T08:54:10","slug":"video-fascinant-survol-cratere-occator-ceres","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/01\/09\/video-fascinant-survol-cratere-occator-ceres\/","title":{"rendered":"En vid\u00e9o : le fascinant survol du crat\u00e8re Occator sur C\u00e9r\u00e8s"},"content":{"rendered":"<p><strong>La NASA vient de publier une vid\u00e9o du survol d&#8217;Occator par la sonde spatiale Dawn. Il s&#8217;agit d&#8217;un myst\u00e9rieux crat\u00e8re situ\u00e9 sur la plan\u00e8te naine C\u00e9r\u00e8s.<\/strong><\/p>\n<p>Avec 940 km de diam\u00e8tre, <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/26\/la-sonde-dawn-devoile-peu-peu-la-surface-de-ceres\/\" target=\"_blank\">C\u00e9r\u00e8s<\/a> est la plus petite plan\u00e8te naine connue. Situ\u00e9e au c\u0153ur de la ceinture d\u2019ast\u00e9ro\u00efdes, elle a \u00e9t\u00e9 d\u00e9couverte le 1er janvier 1801 par Giuseppe Piazzi.<\/p>\n<p>Apr\u00e8s avoir orbit\u00e9 autour de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/11\/22\/lasteroide-vesta-cartographie\/\" target=\"_blank\">Vesta<\/a> entre juillet 2011 et septembre 2012, la sonde <em><a href=\"http:\/\/dawn.jpl.nasa.gov\/\" target=\"_blank\">Dawn<\/a><\/em> (lanc\u00e9e le 27 septembre 2007) est arriv\u00e9e \u00e0 proximit\u00e9 de C\u00e9r\u00e8s au mois de mars 2015. Depuis la mi-d\u00e9cembre 2015 <em>Dawn<\/em> est en orbite \u00e0 sa plus courte distance (380 km), ce qui permet d\u2019obtenir des images tr\u00e8s d\u00e9taill\u00e9es de la surface de cette plan\u00e8te naine avec une r\u00e9solution de 35 m par pixel.<\/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\/x55f0ff\" 0=\"allowfullscreen&gt;&lt;\/iframe\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<p>Parmi les nombreuses interrogations soulev\u00e9es lors du survol de C\u00e9r\u00e8s par la sonde <em>Dawn<\/em>, la pr\u00e9sence de 130 points lumineux (qui tranchent au milieu d&#8217;un paysage\u00a0aussi sombre que de l\u2019asphalte) a beaucoup intrigu\u00e9 les plan\u00e9tologues.<!--more--><\/p>\n<p>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 que la <a href=\"https:\/\/www.nasa.gov\/\" target=\"_blank\">NASA<\/a> nous invite \u00e0 survoler.<\/p>\n<p>La mission de l&#8217;orbiteur <em>Dawn<\/em> autour de C\u00e9r\u00e8s, qui devait prendre fin en juin 2016, a \u00e9t\u00e9 reconduite malgr\u00e9 l&#8217;avis de plusieurs chercheurs qui auraient pr\u00e9f\u00e9r\u00e9 que la sonde soit envoy\u00e9e vers un autre ast\u00e9ro\u00efde. Une t\u00e2che qui revient \u00e0 la sonde <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/09\/16\/new-horizons-devoile-lincroyable-surface-de-pluton\/\" target=\"_blank\"><em>New Horizons<\/em><\/a> qui, apr\u00e8s son survol de Pluton, devrait rejoindre en janvier 2019 un petit objet de la ceinture de Kuiper, 2014 MU69.<\/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>La NASA vient de publier une vid\u00e9o du survol d&#8217;Occator par la sonde spatiale Dawn. Il s&#8217;agit d&#8217;un myst\u00e9rieux crat\u00e8re situ\u00e9 sur la plan\u00e8te naine C\u00e9r\u00e8s. Avec 940 km de diam\u00e8tre, C\u00e9r\u00e8s est la plus petite plan\u00e8te naine connue. Situ\u00e9e au c\u0153ur de la ceinture d\u2019ast\u00e9ro\u00efdes, elle a \u00e9t\u00e9 d\u00e9couverte le 1er janvier 1801 par &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/01\/09\/video-fascinant-survol-cratere-occator-ceres\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">En vid\u00e9o : le fascinant survol du crat\u00e8re Occator sur C\u00e9r\u00e8s<\/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":7088,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[2003,240,631,549,486,1479,627,625,550,628,1013],"class_list":["post-7087","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-2014-mu69","tag-asteroide","tag-ceinture-de-kuiper","tag-ceres","tag-nasa","tag-occator","tag-planete-naine","tag-pluton","tag-sonde-dawn","tag-sonde-new-horizons","tag-video"],"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 fascinant survol du crat\u00e8re Occator sur C\u00e9r\u00e8s<\/title>\n<meta name=\"description\" content=\"La NASA vient de publier une vid\u00e9o du survol d&#039;Occator par la sonde spatiale Dawn. 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