{"id":20008,"date":"2022-02-22T16:41:41","date_gmt":"2022-02-22T16:41:41","guid":{"rendered":"https:\/\/www.africa-press.net\/tchad\/politique\/trois-lunes-autour-dun-asteroide-un-systeme-unique-decouvert-dans-notre-galaxie"},"modified":"2022-02-22T17:12:55","modified_gmt":"2022-02-22T17:12:55","slug":"trois-lunes-autour-dun-asteroide-un-systeme-unique-decouvert-dans-notre-galaxie","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/trois-lunes-autour-dun-asteroide-un-systeme-unique-decouvert-dans-notre-galaxie","title":{"rendered":"Trois lunes autour d\u2019un ast\u00e9ro\u00efde: un syst\u00e8me unique d\u00e9couvert dans notre galaxie"},"content":{"rendered":"

Africa-Press – Tchad. <\/strong><\/span>De nouveaux algorithmes ont men\u00e9 \u00e0 la d\u00e9couverte d\u2019un syst\u00e8me quadruple d\u2019ast\u00e9ro\u00efdes, objet jamais observ\u00e9 jusqu\u2019alors. Quelques semaines apr\u00e8s la d\u00e9couverte d\u2019un second ast\u00e9ro\u00efde troyen dans l\u2019orbite de la Terre, des scientifiques viennent d\u2019identifier un nouvel objet c\u00e9leste unique, rapporte un communiqu\u00e9 de l’Institut national de recherche astronomique de Tha\u00eflande (NARIT).<\/p>\n

Une troisi\u00e8me lune a en effet \u00e9t\u00e9 rep\u00e9r\u00e9e autour de (130) \u00c9lectre, un important ast\u00e9ro\u00efde situ\u00e9 dans notre Syst\u00e8me solaire. L\u2019ast\u00e9ro\u00efde principal, accompagn\u00e9 de ses trois satellites, constitue un syst\u00e8me quadruple, jamais observ\u00e9 jusqu\u2019ici, \u00e0 en croire une \u00e9tude publi\u00e9e dans la revue Astronomy & Astrophysics.<\/p>\n

C\u2019est le d\u00e9veloppement de deux algorithmes qui a rendu possible cette d\u00e9couverte. Les chercheurs ont notamment r\u00e9duit la lumi\u00e8re provenant du halo de (130) \u00c9lectre, qui obstruait l\u2019observation de potentiels satellites. Cela leur a permis d\u2019affiner les donn\u00e9es d\u2019abord recueillies par SPHERE (Spectro-Polarim\u00e8tre \u00e0 Haut contraste d\u00e9di\u00e9 \u00e0 la Recherche d’Exoplan\u00e8tes), un instrument plac\u00e9 sur le Tr\u00e8s Grand T\u00e9lescope, au Chili.<\/p>\n

Ces nouveaux algorithmes avaient au pr\u00e9alable \u00e9t\u00e9 test\u00e9s sur les lunes de Jupiter. Les scientifiques esp\u00e8rent qu\u2019ils pourront d\u00e9sormais \u00eatre utiles pour identifier d\u2019autres objets c\u00e9lestes, toujours \u00e0 partir des donn\u00e9es r\u00e9colt\u00e9es par SPEHRE.<\/p>\n

Deux autres lunes avaient d\u00e9j\u00e0 \u00e9t\u00e9 d\u00e9couvertes pr\u00e8s de (130) \u00c9lectre, en 2014. La troisi\u00e8me lune semble tourner autour de l\u2019ast\u00e9ro\u00efde en 16,3 heures, mais les scientifiques s\u2019interrogent encore sur sa v\u00e9ritable orbite.<\/p>\n

(130) \u00c9lectre elle-m\u00eame, qui fait partie de la ceinture principale de notre Syst\u00e8me solaire, avait \u00e9t\u00e9 d\u00e9couverte bien plus t\u00f4t. C\u2019est le c\u00e9l\u00e8bre chasseur d\u2019ast\u00e9ro\u00efdes Christian Peters qui l\u2019avait rep\u00e9r\u00e9e, en 1873.<\/p>\n

Ast\u00e9ro\u00efdes en tous genres<\/b><\/p>\n

Les d\u00e9couvertes scientifiques ayant trait aux ast\u00e9ro\u00efdes se sont succ\u00e9d\u00e9 ces derniers mois. D\u00e9but f\u00e9vrier, des chercheurs avaient r\u00e9v\u00e9l\u00e9 que la Terre poss\u00e9dait un second ast\u00e9ro\u00efde troyen, c\u2019est-\u00e0-dire un ast\u00e9ro\u00efde gravitant stablement dans son orbite, g\u00e9n\u00e9ralement sans risque de collision.<\/p>\n

En janvier 2021, des scientifiques avaient \u00e9galement mis \u00e0 mal le mythe d\u2019un autre ast\u00e9ro\u00efde c\u00e9l\u00e8bre: celui cens\u00e9 avoir caus\u00e9 la disparition des dinosaures et cr\u00e9\u00e9 le crat\u00e8re de Chicxulub, au Mexique. Une \u00e9tude avan\u00e7ait qu\u2019il ne s\u2019agissait en r\u00e9alit\u00e9 pas d\u2019un ast\u00e9ro\u00efde, mais sans doute d\u2019une com\u00e8te \u00e0 longue p\u00e9riode, ayant heurt\u00e9 la Terre il y a environ 66 millions d\u2019ann\u00e9es.<\/p>\n

Plus r\u00e9cemment, la NASA a entrepris des exp\u00e9riences en vue de prot\u00e9ger notre plan\u00e8te d\u2019\u00e9ventuelles collisions d\u2019ast\u00e9ro\u00efdes. L\u2019agence am\u00e9ricaine compte notamment faire s\u2019\u00e9craser un vaisseau sur l\u2019un d\u2019entre eux, situ\u00e9 \u00e0 quelque 11 millions de kilom\u00e8tres de la Terre. La Chine avait \u00e9galement r\u00e9v\u00e9l\u00e9 un projet similaire, en juillet dernier.<\/p>\n

Pour plus d’informations et d’analyses sur la Tchad<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Tchad. De nouveaux algorithmes ont men\u00e9 \u00e0 la d\u00e9couverte d\u2019un syst\u00e8me quadruple d\u2019ast\u00e9ro\u00efdes, objet jamais observ\u00e9 jusqu\u2019alors. Quelques semaines apr\u00e8s la d\u00e9couverte d\u2019un second ast\u00e9ro\u00efde troyen dans l\u2019orbite de la Terre, des scientifiques viennent d\u2019identifier un nouvel objet c\u00e9leste unique, rapporte un communiqu\u00e9 de l’Institut national de recherche astronomique de Tha\u00eflande (NARIT). Une […]<\/p>\n","protected":false},"author":82,"featured_media":20007,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,11,10],"tags":[37,292,29],"class_list":["post-20008","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-homepage-french","category-toutes-les-actualites","tag-africa-press","tag-africa-press-tchad","tag-tchad"],"yoast_head":"\nTrois lunes autour d\u2019un ast\u00e9ro\u00efde: un syst\u00e8me unique d\u00e9couvert dans notre galaxie - tchad<\/title>\n<meta name=\"description\" content=\"De nouveaux algorithmes ont men\u00e9 \u00e0 la d\u00e9couverte d\u2019un syst\u00e8me quadruple d\u2019ast\u00e9ro\u00efdes, objet jamais observ\u00e9 jusqu\u2019alors. ...\" \/>\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\/tchad\/toutes-les-actualites\/trois-lunes-autour-dun-asteroide-un-systeme-unique-decouvert-dans-notre-galaxie\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Trois lunes autour d\u2019un ast\u00e9ro\u00efde: un syst\u00e8me unique d\u00e9couvert dans notre galaxie\" \/>\n<meta property=\"og:description\" content=\"De nouveaux algorithmes ont men\u00e9 \u00e0 la d\u00e9couverte d\u2019un syst\u00e8me quadruple d\u2019ast\u00e9ro\u00efdes, objet jamais observ\u00e9 jusqu\u2019alors. ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/trois-lunes-autour-dun-asteroide-un-systeme-unique-decouvert-dans-notre-galaxie\" \/>\n<meta property=\"og:site_name\" content=\"tchad\" \/>\n<meta property=\"article:published_time\" content=\"2022-02-22T16:41:41+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-02-22T17:12:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2022\/02\/img-6215194de237f.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1920\" \/>\n\t<meta property=\"og:image:height\" content=\"1080\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/trois-lunes-autour-dun-asteroide-un-systeme-unique-decouvert-dans-notre-galaxie#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/trois-lunes-autour-dun-asteroide-un-systeme-unique-decouvert-dans-notre-galaxie\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Trois lunes autour d\u2019un ast\u00e9ro\u00efde: un syst\u00e8me unique d\u00e9couvert dans notre galaxie\",\"datePublished\":\"2022-02-22T16:41:41+00:00\",\"dateModified\":\"2022-02-22T17:12:55+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/trois-lunes-autour-dun-asteroide-un-systeme-unique-decouvert-dans-notre-galaxie\"},\"wordCount\":556,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/trois-lunes-autour-dun-asteroide-un-systeme-unique-decouvert-dans-notre-galaxie#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2022\/02\/img-6215194de237f.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Tchad\",\"Tchad\"],\"articleSection\":[\"Divers\",\"homepage-french\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/trois-lunes-autour-dun-asteroide-un-systeme-unique-decouvert-dans-notre-galaxie#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/trois-lunes-autour-dun-asteroide-un-systeme-unique-decouvert-dans-notre-galaxie\",\"url\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/trois-lunes-autour-dun-asteroide-un-systeme-unique-decouvert-dans-notre-galaxie\",\"name\":\"Trois lunes autour d\u2019un ast\u00e9ro\u00efde: un syst\u00e8me unique d\u00e9couvert dans notre galaxie - 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