{"id":97628,"date":"2025-04-15T16:46:16","date_gmt":"2025-04-15T16:46:16","guid":{"rendered":"https:\/\/www.africa-press.net\/cotedivoire\/politique\/les-aurores-duranus-revelent-sa-vitesse-de-rotation"},"modified":"2025-04-15T16:46:16","modified_gmt":"2025-04-15T16:46:16","slug":"les-aurores-duranus-revelent-sa-vitesse-de-rotation","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/les-aurores-duranus-revelent-sa-vitesse-de-rotation","title":{"rendered":"Les aurores d\u2019Uranus r\u00e9v\u00e8lent sa vitesse de rotation"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. <\/strong><\/span>Uranus, septie\u0300me plane\u0300te du syste\u0300me solaire, est une ge\u0301ante glace\u0301e entoure\u0301e d&rsquo;anneaux et environ quatre fois plus grosse que la Terre. C&rsquo;est un astre largement inconnu qu&rsquo;aucune mission spatiale n&rsquo;a encore visite\u0301, a\u0300 l&rsquo;exception de la sonde Voyager 2 qui l&rsquo;a survole\u0301 en 1986 et qui a depuis quitte\u0301 le syste\u0300me solaire. Elle a contribue\u0301 a\u0300 re\u0301ve\u0301ler quelques secrets comme l&rsquo;existence de deux anneaux supple\u0301mentaires (on en connaissait 9 avant son passage et aujourd&rsquo;hui on en de\u0301nombre 13), de 11 nouvelles lunes ; la sonde a e\u0301galement permis de mesurer la vitesse de rotation de la plane\u0300te.<\/p>\n<p><b>Une mesure plus durable<\/b><\/p>\n<p>La mesure faite par Voyager est a\u0300 la base du syste\u0300me de longitude d&rsquo;Uranus, toujours utilise\u0301 actuellement. Il est pourtant bien impre\u0301cis car la sonde n&rsquo;a eu le temps que d&rsquo;un bref passage pour re\u0301colter des donne\u0301es. Cette fois, afin d&rsquo;obtenir une mesure plus durable, une e\u0301quipe dirige\u0301e par Laurent Lamy (LIRA, Observatoire de Paris-PSL et LAM, Universite\u0301 d&rsquo;Aix-Marseille, France) a de\u0301veloppe\u0301 une me\u0301thode innovante pour suivre le mouvement de rotation des aurores d&rsquo;Uranus. Elle fait l&rsquo;objet d&rsquo;une publication dans la revue Nature astronomy.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"147\" class=\"alignnone wp-image-97626 size-full\" src=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/04\/sm_1744723311.720824.jpg\" srcset=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/04\/sm_1744723311.720824.jpg 453w, https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/04\/sm_1744723311.720824-300x97.jpg 300w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><\/p>\n<p><b>Les observations d&rsquo;Hubble<\/b><\/p>\n<p>Conse\u0301quence de ce de\u0301calage, les aurores de\u0301crivent de curieuses trajectoires au fil du temps. C\u2019est pre\u0301cise\u0301ment en suivant ces de\u0301placements au travers de 17 ans d\u2019archives d\u2019observations du te\u0301lescope Hubble que les chercheurs ont pu en de\u0301duire la vitesse de rotation de la plane\u0300te, avec un niveau de pre\u0301cision 1000 fois supe\u0301rieur aux estimations pre\u0301ce\u0301dentes.<\/p>\n<p>Cette rotation interne, de\u0301sormais mesure\u0301e a\u0300 17 heures, 14 minutes et 52 secondes, soit 28 secondes de plus que l&rsquo;estimation obtenue par Voyager 2, sert de nouvelle re\u0301fe\u0301rence pour les mode\u0300les atmosphe\u0301riques d\u2019Uranus, souvent incohe\u0301rents a\u0300 cause d\u2019une mauvaise prise en compte de ce parame\u0300tre fondamental. Selon les chercheurs, cette approche pourrait de\u0301sormais s\u2019e\u0301tendre aux autres plane\u0300tes ge\u0301antes.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">C\u00f4te d&rsquo;Ivoire<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<span style=\"color: #ff6600\"><\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. Uranus, septie\u0300me plane\u0300te du syste\u0300me solaire, est une ge\u0301ante glace\u0301e entoure\u0301e d&rsquo;anneaux et environ quatre fois plus grosse que la Terre. C&rsquo;est un astre largement inconnu qu&rsquo;aucune mission spatiale n&rsquo;a encore visite\u0301, a\u0300 l&rsquo;exception de la sonde Voyager 2 qui l&rsquo;a survole\u0301 en 1986 et qui a depuis quitte\u0301 le syste\u0300me [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":97627,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[37],"class_list":["post-97628","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-cote-divoire-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Les aurores d\u2019Uranus r\u00e9v\u00e8lent sa vitesse de rotation - C\u00f4te d&#039;Ivoire<\/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:\/\/www.africa-press.net\/cotedivoire\/politique\/les-aurores-duranus-revelent-sa-vitesse-de-rotation\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les aurores d\u2019Uranus r\u00e9v\u00e8lent sa vitesse de rotation\" \/>\n<meta property=\"og:description\" content=\"Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. 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