{"id":1316,"date":"2014-12-04T19:19:44","date_gmt":"2014-12-04T19:19:44","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1316"},"modified":"2014-12-10T16:57:46","modified_gmt":"2014-12-10T16:57:46","slug":"comete-67p-est-elle-vraiment-rouge","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/04\/comete-67p-est-elle-vraiment-rouge\/","title":{"rendered":"La com\u00e8te 67P est-elle vraiment rouge ?"},"content":{"rendered":"<p>L&#8217;<a title=\"American Geophysical Union\" href=\"http:\/\/sites.agu.org\/\" target=\"_blank\"><em>American Geophysical Union<\/em><\/a> vient de publier la premi\u00e8re image en couleurs de la com\u00e8te 67P\/Churyumov-Gerasimenko. Il s&#8217;agit d&#8217;un compositage de 3 clich\u00e9s noir et blanc pris \u00e0 l&#8217;aide de diff\u00e9rents filtres par la cam\u00e9ra Osiris qui se trouve \u00e0 bord de l&#8217;orbiteur Rosetta. Ce dernier poursuit en effet sa mission autour de la com\u00e8te, sur laquelle l&#8217;atterrisseur <a title=\"Philae : son premier atterrissage en image\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/11\/15\/philae-premier-atterrissage-en-image\/\" target=\"_blank\">Philae <\/a>(toujours pas localis\u00e9) s&#8217;est endormi.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/12\/comet.jpg\" rel=\"lightbox[1316]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1319\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/12\/comet-450x420.jpg\" alt=\"comet\" width=\"450\" height=\"420\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/12\/comet-450x420.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/12\/comet.jpg 801w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Cette image pr\u00e9sente une \u00e9tonnante couleur rouge, bien loin de ce que nous avons l&#8217;habitude de voir : les <a title=\"Souvenir de Hale-Bopp\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/07\/souvenir-hale-bopp\/\" target=\"_blank\">com\u00e8tes<\/a>, m\u00e9lange de glace et de poussi\u00e8re, sont des astres dont la surface est d&#8217;un gris tr\u00e8s sombre. Alors d&#8217;o\u00f9 vient cette teinte ?<\/p>\n<p>Pour les scientifiques, cette couleur a deux origines :<\/p>\n<ul>\n<li>un d\u00e9calage vers le rouge du spectre de la lumi\u00e8re solaire renvoy\u00e9e par la surface de 67P. Ce d\u00e9calage est provoqu\u00e9 par la forte alt\u00e9ration de la couche de mat\u00e9riau qui compose la surface de la com\u00e8te, couche qui subit le bombardement incessant des particules \u00e9nerg\u00e9tiques transport\u00e9es par le vent solaire<\/li>\n<li>le traitement num\u00e9rique destin\u00e9 \u00e0 accentuer les contrastes des images prises par la cam\u00e9ra Osiris<\/li>\n<\/ul>\n<p>Il est fort probable qu&#8217;un hypoth\u00e9tique observateur plac\u00e9 \u00e0 bord de la sonde Rosetta verrait\u00a0la com\u00e8te 67P\/Churyumov-Gerasimenko aussi noire qu&#8217;un morceau de charbon !<\/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>L&#8217;American Geophysical Union vient de publier la premi\u00e8re image en couleurs de la com\u00e8te 67P\/Churyumov-Gerasimenko. Il s&#8217;agit d&#8217;un compositage de 3 clich\u00e9s noir et blanc pris \u00e0 l&#8217;aide de diff\u00e9rents filtres par la cam\u00e9ra Osiris qui se trouve \u00e0 bord de l&#8217;orbiteur Rosetta. Ce dernier poursuit en effet sa mission autour de la com\u00e8te, sur &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/04\/comete-67p-est-elle-vraiment-rouge\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La com\u00e8te 67P est-elle vraiment rouge ?<\/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":1319,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[617,513,517,441,93,467,620,542,534,619,510,515,521,618],"class_list":["post-1316","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-american-geophysical-union","tag-atterrisseur","tag-camera","tag-charbon","tag-comete","tag-comete-churyumov-gerasimenko","tag-decalage-spectral","tag-glace","tag-orbiteur","tag-particule","tag-philae","tag-poussiere","tag-rosetta","tag-vent-solaire"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>La com\u00e8te 67P est-elle vraiment rouge ?<\/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\/2014\/12\/04\/comete-67p-est-elle-vraiment-rouge\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La com\u00e8te 67P est-elle vraiment rouge ?\" \/>\n<meta property=\"og:description\" content=\"L&#8217;American Geophysical Union vient de publier la premi\u00e8re image en couleurs de la com\u00e8te 67P\/Churyumov-Gerasimenko. 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