{"id":9868,"date":"2015-12-10T12:00:39","date_gmt":"2015-12-10T11:00:39","guid":{"rendered":"http:\/\/www.laterredufutur.com\/accueil\/?p=9868"},"modified":"2015-12-10T16:49:15","modified_gmt":"2015-12-10T15:49:15","slug":"la-sonde-dawn-detecte-la-presence-dammoniac-sur-ceres","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/la-sonde-dawn-detecte-la-presence-dammoniac-sur-ceres\/","title":{"rendered":"La sonde DAWN d\u00e9tecte la pr\u00e9sence d&rsquo;ammoniac sur C\u00e9r\u00e8s"},"content":{"rendered":"<div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"1\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p style=\"text-align: justify;\">Des traces d&rsquo;argile contenant de l&rsquo;ammoniac ! Ces donn\u00e9es ont \u00e9t\u00e9\u00a0enregistr\u00e9es par l&rsquo;instrument de la sonde spatiale Aube VIR de\u00a0la surface de la plan\u00e8te naine C\u00e9r\u00e8s. Les r\u00e9sultats, obtenus gr\u00e2ce au\u00a0VIR du spectrom\u00e8tre d&rsquo;imagerie, faite par Selex Galileo avec la coordination et le financement de l&rsquo;ASI et l&rsquo;orientation scientifique IAPS-INAF, sugg\u00e8re que C\u00e9r\u00e8s peut s&rsquo;\u00eatre form\u00e9e dans une zone ext\u00e9rieure du syst\u00e8me solaire par rapport \u00e0 sa position actuelle.<\/p>\n<p style=\"text-align: justify;\">\u00ab\u00a0La d\u00e9couverte d&rsquo;ammoniac\u00a0sur C\u00e9r\u00e8s indique que ce corps a pu \u00eatre au moins partiellement constitu\u00e9 de mat\u00e9riaux d&rsquo;accr\u00e9tion \u00e0 des temp\u00e9ratures tr\u00e8s basses, typiques des zones ext\u00e9rieures du syst\u00e8me solaire. L&rsquo;ammoniac a \u00e9t\u00e9 d\u00e9tect\u00e9, par exemple, sur certains objets transneptuniens et sur \u200b\u200ble syst\u00e8me de Pluton. Cette d\u00e9couverte pourrait confirmer certaines th\u00e9ories sur la migration des plan\u00e8tes dans les stades primordiaux du syst\u00e8me solaire \u00ab\u00a0, a d\u00e9clar\u00e9 Maria Cristina De Sanctis, l&rsquo;INAF &#8211; IAPS, directeur scientifique et l&rsquo;auteur principal, qui sera publi\u00e9 le 10 D\u00e9cembre 2015 dans la revue Nature.<\/p>\n<p style=\"text-align: justify;\">La pr\u00e9sence d&rsquo;ammoniac est une question d&rsquo;une importance fondamentale pour l&rsquo;\u00e9tude de l&rsquo;histoire \u00e9volutive de C\u00e9r\u00e8s. Aujourd&rsquo;hui, avec les conditions actuelles de temp\u00e9rature et de pression, la glace d&rsquo;ammoniac ne pourrait pas survivre \u00e0 la surface. Ni dans le pass\u00e9, de l&rsquo;avis des scientifiques, l&rsquo;ammoniac pourrait s&rsquo;\u00eatre form\u00e9 dans des quantit\u00e9s coh\u00e9rentes avec les observations actuelles du VIR, compte tenu de la position actuelle de C\u00e9r\u00e8s. Cette contradiction sugg\u00e8re la possibilit\u00e9 que C\u00e9r\u00e8s ne s&rsquo;est pas form\u00e9e o\u00f9 elle\u00a0r\u00e9side actuellement\u00a0dans la ceinture d&rsquo;ast\u00e9ro\u00efdes entre Mars et Jupiter.<\/p><div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"2\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n\n<p style=\"text-align: justify;\">\u00ab\u00a0DAWN nous aide \u00e0 comprendre la formation et l&rsquo;\u00e9volution du syst\u00e8me solaire &#8211; a comment\u00e9 Raffaele Mugnuolo ASI responsable de la mission &#8211; dans les premiers milliards d&rsquo;ann\u00e9es, les plan\u00e8tes bougeaient encore avant d&rsquo;atteindre l&rsquo;\u00e9quilibre orbital actuel et il semble que C\u00e9r\u00e8s ait \u00e9galement pris le m\u00eame chemin \u00ab\u00a0.<\/p>\n<p style=\"text-align: justify;\">Les derni\u00e8res donn\u00e9es recueillies par la sonde mettent encore les diff\u00e9rences entre les deux corps c\u00e9lestes observ\u00e9s par DAWN: Vesta est s\u00e8che et a une surface pleine de crat\u00e8res qui t\u00e9moignent de son s\u00e9jour dans la ceinture d&rsquo;ast\u00e9ro\u00efdes. C\u00e9r\u00e8s est diff\u00e9rente, c&rsquo;est\u00a0un petit monde sombre avec des caract\u00e9ristiques morphologiques dont la nature reste encore \u00e0 d\u00e9couvrir.<\/p>\n<p style=\"text-align: justify;\">Vous avez juste \u00e0 attendre\u00a0la prochaine phase de la mission pr\u00e9vue pour la mi-D\u00e9cembre 2015 : DAWN observera C\u00e9r\u00e8s \u00ab\u00a0seulement\u00a0\u00bb \u00e0 une distance de 380 kilom\u00e8tres: ce qui lui permettra d&rsquo;obtenir des images \u00e0 haute r\u00e9solution de la plus haute importance sur\u00a0la\u00a0recherche des plan\u00e9to\u00efdes.<\/p>\n<p>Traduction et adaptation de <a href=\"http:\/\/www.laterredufutur.com\/accueil\/\">la Terre du Futur<\/a><\/p>\n<p>source :\u00a0<a href=\"http:\/\/www.meteoweb.eu\/\" target=\"_blank\">http:\/\/www.meteoweb.eu\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"9868\">(332)<\/p>\n<!--CusAds0-->\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Des traces d&rsquo;argile contenant de l&rsquo;ammoniac ! Ces donn\u00e9es ont \u00e9t\u00e9\u00a0enregistr\u00e9es par l&rsquo;instrument de la sonde spatiale Aube VIR de\u00a0la&#8230;<\/p>\n","protected":false},"author":1,"featured_media":9869,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"La sonde DAWN d\u00e9tecte la pr\u00e9sence d'ammoniac sur #C\u00e9r\u00e8s @laterredufutur","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[22],"tags":[5230,4285,4287,538,117,121,702,363,5231],"class_list":["post-9868","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-espace","tag-ammoniac","tag-ceres","tag-dawn","tag-decouverte","tag-espace","tag-planete","tag-sonde","tag-systeme-solaire","tag-vir","wpcat-22-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/12\/ceres.png?fit=644%2C362&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-2za","jetpack-related-posts":[{"id":7514,"url":"https:\/\/www.laterredufutur.com\/accueil\/ceres-apres-les-points-lumineux-une-mysterieuse-pyramide\/","url_meta":{"origin":9868,"position":0},"title":"C\u00e9r\u00e8s: apr\u00e8s les points lumineux, une myst\u00e9rieuse pyramide","author":"Admin","date":"30 juin 2015","format":false,"excerpt":"Une montagne en forme de pyramide haute comme le Mont Blanc, plant\u00e9e au milieu d'une plaine sur une \"plan\u00e8te naine\". C'est le dernier myst\u00e8re d\u00e9couvert sur C\u00e9r\u00e8s par la sonde Dawn. D\u00e9cid\u00e9ment, C\u00e9r\u00e8s entretient le myst\u00e8re. La plan\u00e8te naine, scrut\u00e9e par la sonde am\u00e9ricaine Dawn en orbite autour d'elle depuis\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/06\/ceres-pyramide.jpg?fit=800%2C450&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/06\/ceres-pyramide.jpg?fit=800%2C450&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/06\/ceres-pyramide.jpg?fit=800%2C450&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/06\/ceres-pyramide.jpg?fit=800%2C450&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":8147,"url":"https:\/\/www.laterredufutur.com\/accueil\/nouvelle-photo-de-ceres-qui-apporte-plus-de-precision-visuelle\/","url_meta":{"origin":9868,"position":1},"title":"Nouvelle photo de C\u00e9r\u00e8s qui apporte plus de pr\u00e9cisions visuelles","author":"Admin","date":"9 septembre 2015","format":false,"excerpt":"Depuis son orbite actuelle autour de la plan\u00e8te naine C\u00e9r\u00e8s, la sonde Dawn revisite les curiosit\u00e9s qu'elle a d\u00e9couvertes au cours des derniers mois. Parmi elles, il y a ces myst\u00e9rieuses taches blanches, en apparence \u00e9clatantes au beau milieu d'un crat\u00e8re d'impact, qui a re\u00e7u depuis le nom d'Occator. Sur\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/09\/Ceres.jpg?fit=960%2C960&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/09\/Ceres.jpg?fit=960%2C960&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/09\/Ceres.jpg?fit=960%2C960&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/09\/Ceres.jpg?fit=960%2C960&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":6537,"url":"https:\/\/www.laterredufutur.com\/accueil\/nouvelles-images-exceptionnelles-de-ceres\/","url_meta":{"origin":9868,"position":2},"title":"Nouvelles images exceptionnelles de C\u00e9r\u00e8s","author":"Admin","date":"11 mai 2015","format":false,"excerpt":"Il y a quelques semaines, C\u00e9r\u00e8s avait fait la une, un point\u00a0lumineux avait \u00e9t\u00e9 observ\u00e9 et restait tout \u00e0 fait myst\u00e9rieux. Voici\u00a0une nouvelle s\u00e9quence d'images o\u00f9 la\u00a0r\u00e9solution est nettement sup\u00e9rieure et elles ont \u00e9t\u00e9 prises par la sonde Dawn de la NASA du 3 et 4 mai 2015. Les myst\u00e9rieux\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/05\/ceres.jpg?fit=800%2C600&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/05\/ceres.jpg?fit=800%2C600&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/05\/ceres.jpg?fit=800%2C600&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/05\/ceres.jpg?fit=800%2C600&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":15292,"url":"https:\/\/www.laterredufutur.com\/accueil\/21-may-2017-1050\/","url_meta":{"origin":9868,"position":3},"title":"Ceres \u00e0 l&rsquo;opposition du soleil par la sonde DAWN","author":"Admin","date":"21 mai 2017","format":"chat","excerpt":"Le vaisseau spatial Dawn de la NASA a observ\u00e9 avec succ\u00e8s Ceres \u00e0 l'opposition le 29 avril, prenant des images d'une position exacte entre le soleil et la surface de Ceres. Les sp\u00e9cialistes de la mission ont soigneusement man\u0153uvr\u00e9 Dawn dans une orbite sp\u00e9ciale pour que l'engin spatial puisse voir\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/05\/pia19547-1041b.gif?fit=1041%2C894&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/05\/pia19547-1041b.gif?fit=1041%2C894&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/05\/pia19547-1041b.gif?fit=1041%2C894&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/05\/pia19547-1041b.gif?fit=1041%2C894&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":11566,"url":"https:\/\/www.laterredufutur.com\/accueil\/ceres-devoilee-dans-ses-moindres-details\/","url_meta":{"origin":9868,"position":4},"title":"C\u00e9r\u00e8s d\u00e9voil\u00e9e dans ses moindres d\u00e9tails","author":"Admin","date":"24 mars 2016","format":false,"excerpt":"Notre vaisseau spatial Dawn\u00a0a r\u00e9v\u00e9l\u00e9 des images merveilleuses de l'orbite la plus basse de\u00a0la\u00a0plan\u00e8te naine Ceres, r\u00e9v\u00e9lant les points lumineux et les diff\u00e9rences de couleur sur la surface. Jetez un coup d' oeil... Ces images sont in\u00e9dites : https:\/\/youtu.be\/nJiw2NxqoBU?list=PLTiv_XWHnOZpbLZz4C2iQW2bgfdzKMbhS C\u00e9r\u00e8s d\u00e9voil\u00e9e dans ses moindres d\u00e9tails \u00a0 \u00a0","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/03\/taches-ceres.jpg?fit=975%2C548&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/03\/taches-ceres.jpg?fit=975%2C548&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/03\/taches-ceres.jpg?fit=975%2C548&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/03\/taches-ceres.jpg?fit=975%2C548&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":10928,"url":"https:\/\/www.laterredufutur.com\/accueil\/ceres-comme-si-vous-y-etiez\/","url_meta":{"origin":9868,"position":5},"title":"C\u00e9r\u00e8s, comme si vous y \u00e9tiez","author":"Admin","date":"6 f\u00e9vrier 2016","format":false,"excerpt":"Ce qui suit est une video fabuleuse de C\u00e9r\u00e8s dans toute sa splendeur. C\u00e9r\u00e8s intrigue en effet les chercheurs depuis longtemps: d\u00e9couverte en 1801, elle a \u00e9t\u00e9 d'abord consid\u00e9r\u00e9e comme une plan\u00e8te, puis comme un ast\u00e9ro\u00efde, et finalement comme une \"plan\u00e8te-naine\" depuis 2006. Tous s'interrogent sur la pr\u00e9sence de plus\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/12\/ceres.png?fit=644%2C362&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/12\/ceres.png?fit=644%2C362&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/12\/ceres.png?fit=644%2C362&ssl=1&resize=525%2C300 1.5x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/9868","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/comments?post=9868"}],"version-history":[{"count":3,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/9868\/revisions"}],"predecessor-version":[{"id":9875,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/9868\/revisions\/9875"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/9869"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=9868"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=9868"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=9868"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}