{"id":1933,"date":"2015-02-26T06:20:35","date_gmt":"2015-02-26T06:20:35","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1933"},"modified":"2015-03-02T15:05:53","modified_gmt":"2015-03-02T15:05:53","slug":"la-sonde-dawn-devoile-peu-peu-la-surface-de-ceres","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/26\/la-sonde-dawn-devoile-peu-peu-la-surface-de-ceres\/","title":{"rendered":"La sonde Dawn d\u00e9voile peu \u00e0 peu la surface de C\u00e9r\u00e8s"},"content":{"rendered":"

C\u00e9r\u00e8s a \u00e9t\u00e9 d\u00e9couverte le premier jour de l’ann\u00e9e 1801 par l’astronome italien Giuseppe Piazzi. Avec un diam\u00e8tre d’environ 950 km, c’est est la plus petite des cinq plan\u00e8tes naines<\/a> connues \u00e0 ce jour (il y a aussi Haum\u00e9a, Eris, Mak\u00e9mak\u00e9 et Pluton<\/a>).<\/p>\n

\"ceres2\"<\/a><\/p>\n

Alors que les 4 autres plan\u00e8tes naines circulent au-del\u00e0 de l’orbite de Neptune<\/a>, C\u00e9r\u00e8s se d\u00e9place entre Mars <\/a>et Jupiter<\/a>, ce qui permet de la suivre avec un petit t\u00e9lescope <\/a>(sa magnitude varie de 6,7 \u00e0 9,3).<\/p>\n

Apr\u00e8s avoir pass\u00e9 un an autour de l’ast\u00e9ro\u00efde Vesta <\/a>(de juillet 2011 \u00e0 juillet 2012), la sonde am\u00e9ricaine Dawn <\/a>(qui avait \u00e9t\u00e9 lanc\u00e9e en septembre 2007) s’approche d\u00e9sormais de C\u00e9r\u00e8s. Elle va se satelliser autour de la plan\u00e8te naine au d\u00e9but du mois de mars et s’en rapprocher progressivement jusqu’\u00e0 environ 1 500 km pour l’\u00e9tudier en d\u00e9tail.<\/p>\n

On savait peu de chose sur C\u00e9r\u00e8s jusqu’\u00e0 pr\u00e9sent, si ce n’est que la plan\u00e8te naine est entour\u00e9e d’une tr\u00e8s fine atmosph\u00e8re charg\u00e9e en vapeur d’eau, comme l’a confirm\u00e9 il y a un an le t\u00e9lescope spatial Herschel<\/a>.<\/p>\n

Les images de C\u00e9r\u00e8s r\u00e9alis\u00e9es par la sonde Dawn le 12 f\u00e9vrier \u00e0 une distance de 83 000 km (la r\u00e9solution est d’environ 8 km par pixel) r\u00e9v\u00e8lent un sol crat\u00e9ris\u00e9 semblable \u00e0 la surface de la Lune <\/a>et de Mercure <\/a>avec d’\u00e9nigmatiques taches tr\u00e8s brillantes. Il faudra attendre que la sonde se rapproche et fournisse des photographies avec une meilleure r\u00e9solution pour expliquer l’origine de ces taches.<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00e9r\u00e8s a \u00e9t\u00e9 d\u00e9couverte le premier jour de l’ann\u00e9e 1801 par l’astronome italien Giuseppe Piazzi. Avec un diam\u00e8tre d’environ 950 km, c’est est la plus petite des cinq plan\u00e8tes naines connues \u00e0 ce jour (il y a aussi Haum\u00e9a, Eris, Mak\u00e9mak\u00e9 et Pluton). Alors que les 4 autres plan\u00e8tes naines circulent au-del\u00e0 de l’orbite de … Continuer la lecture de La sonde Dawn d\u00e9voile peu \u00e0 peu la surface de C\u00e9r\u00e8s<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":1934,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[240,549,108,854,90,82,116,140,525,627,550,96,821,548],"class_list":["post-1933","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-asteroide","tag-ceres","tag-cratere","tag-giuseppe-piazzi","tag-jupiter","tag-lune","tag-mars","tag-mercure","tag-pixel","tag-planete-naine","tag-sonde-dawn","tag-telescope","tag-telescope-spatial-herschel","tag-vesta"],"yoast_head":"\nLa sonde Dawn d\u00e9voile peu \u00e0 peu la surface de C\u00e9r\u00e8s<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/26\/la-sonde-dawn-devoile-peu-peu-la-surface-de-ceres\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La sonde Dawn d\u00e9voile peu \u00e0 peu la surface de C\u00e9r\u00e8s\" \/>\n<meta property=\"og:description\" content=\"C\u00e9r\u00e8s a \u00e9t\u00e9 d\u00e9couverte le premier jour de l’ann\u00e9e 1801 par l’astronome italien Giuseppe Piazzi. Avec un diam\u00e8tre d’environ 950 km, c’est est la plus petite des cinq plan\u00e8tes naines connues \u00e0 ce jour (il y a aussi Haum\u00e9a, Eris, Mak\u00e9mak\u00e9 et Pluton). 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