{"id":77293,"date":"2026-03-20T00:12:02","date_gmt":"2026-03-20T00:12:02","guid":{"rendered":"https:\/\/www.africa-press.net\/gabon\/politique\/asteroide-devie-par-la-nasa-change-dorbite-solaire"},"modified":"2026-04-18T03:18:08","modified_gmt":"2026-04-18T03:18:08","slug":"asteroide-devie-par-la-nasa-change-dorbite-solaire","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/gabon\/toutes-les-actualites\/asteroide-devie-par-la-nasa-change-dorbite-solaire","title":{"rendered":"Ast\u00e9ro\u00efde D\u00e9vi\u00e9 Par La Nasa Change D’Orbite Solaire"},"content":{"rendered":"

Africa-Press – Gabon. <\/strong> <\/span>Il y a quatre ans, la Nasa faisait s’e\u0301craser un vaisseau sur un petit aste\u0301roi\u0308de pour tenter de de\u0301vier sa trajectoire, une manoeuvre digne d’un roman de science-fiction qui visait a\u0300 apprendre comment prote\u0301ger l’humanite\u0301 d’une e\u0301ventuelle menace future. Nomme\u0301e Dart, cette mission test ine\u0301dite visait un petit aste\u0301roi\u0308de sans danger nomme\u0301 Dimorphos, satellite d’un aste\u0301roi\u0308de plus grand, Didymos.<\/p>\n

Une question de \u00ab\u00a0de\u0301fense plane\u0301taire\u00a0\u00bb <\/b><\/p>\n

L’impact du vaisseau a conduit Dimorphos a\u0300 adopter une trajectoire plus courte et plus rapide autour de Didymos, autour duquel il orbite. Mais il a aussi propulse\u0301 ce duo sur une orbite le\u0301ge\u0300rement diffe\u0301rente autour du Soleil, selon une e\u0301tude publie\u0301e cette semaine dans la revue Science Advances.<\/p>\n

Ces analyses comple\u0301mentaires offrent ainsi des donne\u0301es solides pour e\u0301tablir un plan de \u00ab\u00a0de\u0301fense plane\u0301taire\u00a0\u00bb si un aste\u0301roi\u0308de menace a\u0300 l’avenir de frapper la Terre, pointent les chercheurs internationaux a\u0300 l’origine de cette e\u0301tude. \u00ab\u00a0Cette e\u0301tude marque un progre\u0300s notable dans notre capacite\u0301 a\u0300 pre\u0301venir de futurs impacts d’aste\u0301roi\u0308des sur la Terre\u00a0\u00bb, y e\u0301crivent-ils.<\/p>\n

Leurs observations de\u0301taille\u0301es documentent les effets de la mission Dart de 2022 et montrent que pour \u00ab\u00a0la premie\u0300re fois\u00a0\u00bb un \u00ab\u00a0objet fabrique\u0301 par l’e\u0302tre humain a modifie\u0301 de manie\u0300re mesurable la trajectoire d’un corps ce\u0301leste autour du Soleil\u00a0\u00bb, a releve\u0301 la Nasa dans un communique\u0301.<\/p>\n

Une \u00ab\u00a0de\u0301viation significative\u00a0\u00bb<\/b><\/p>\n

Pour ce faire, les chercheurs ont e\u0301tudie\u0301 des occultations stellaires, c’est-a\u0300-dire les moments ou\u0300 un aste\u0301roi\u0308de passe devant une e\u0301toile et provoque par la\u0300 un bref affaiblissement de sa luminosite\u0301, explique l’auteur principal de l’e\u0301tude, Rahil Makadia, a\u0300 l’AFP. Ces occultations leur ont permis d’obtenir des mesures ultra-pre\u0301cises sur la position, la vitesse et de la forme de l’aste\u0301roi\u0308de.<\/p>\n

Toutefois, elles sont difficiles a\u0300 suivre. L’e\u0301quipe s’est donc appuye\u0301e sur des astronomes amateurs du monde entier, qui ont enregistre\u0301 22 de ces occultations stellaires. En utilisant ces donne\u0301es ainsi que des anne\u0301es d’observations supple\u0301mentaires, ils ont pu mesurer l’orbite de Didymos autour du Soleil avec une grande pre\u0301cision, explique M. Makadia. \u00ab\u00a0Nous avons pu mesurer exactement l’ordre de ce changement\u00a0\u00bb et effectuer des calculs qui pourraient aider de futurs \u00ab\u00a0efforts de de\u0301fense plane\u0301taire\u00a0\u00bb, poursuit-il.<\/p>\n

La modification de l’orbite ainsi calcule\u0301e e\u0301tait minuscule, la pe\u0301riode de re\u0301volution n’ayant change\u0301 que de seulement 0,15 seconde. Bien que minime, ce changement suffit pour faire la diffe\u0301rence, assurent les scientifiques.<\/p>\n

\u00ab\u00a0Avec suffisamment de temps, me\u0302me un changement minime peut se traduire par une de\u0301viation significative\u00a0\u00bb, rele\u0300ve ainsi Thomas Statler, un responsable scientifique de la Nasa dans un communique\u0301. \u00ab\u00a0Les mesures incroyablement pre\u0301cises re\u0301alise\u0301es par l’e\u0301quipe confirment une nouvelle fois l’efficacite\u0301\u00a0\u00bb de cette technique de de\u0301fense plane\u0301taire, et montrent comment un aste\u0301roi\u0308de binaire, c’est a\u0300 dire un syste\u0300me compose\u0301 de deux aste\u0301roi\u0308des comme dans le Dimorphos et Didymos \u00ab\u00a0pourrait e\u0302tre de\u0301vie\u0301 en ne frappant qu’un seul des deux aste\u0301roi\u0308des qui le composent\u00a0\u00bb.<\/p>\n

Retrouvez plus d\u2019actualit\u00e9s et d\u2019analyses sur Gabon<\/span> sur le site Africa Press<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Gabon. Il y a quatre ans, la Nasa faisait s’e\u0301craser un vaisseau sur un petit aste\u0301roi\u0308de pour tenter de de\u0301vier sa trajectoire, une manoeuvre digne d’un roman de science-fiction qui visait a\u0300 apprendre comment prote\u0301ger l’humanite\u0301 d’une e\u0301ventuelle menace future. Nomme\u0301e Dart, cette mission test ine\u0301dite visait un petit aste\u0301roi\u0308de sans danger nomme\u0301 […]<\/p>\n","protected":false},"author":82,"featured_media":77292,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[49],"class_list":["post-77293","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-gabon"],"yoast_head":"\nAst\u00e9ro\u00efde D\u00e9vi\u00e9 Par La Nasa Change D'Orbite Solaire - Gabon<\/title>\n<meta name=\"description\" content=\"-article-header-tag"> Africa-Press - Gabon. 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