{"id":15356,"date":"2021-12-07T18:37:47","date_gmt":"2021-12-07T18:37:47","guid":{"rendered":"https:\/\/www.africa-press.net\/tchad\/politique\/la-nasa-renforce-sa-prise-sur-les-asteroides-geocroiseurs"},"modified":"2021-12-08T01:37:49","modified_gmt":"2021-12-08T01:37:49","slug":"la-nasa-renforce-sa-prise-sur-les-asteroides-geocroiseurs","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/la-nasa-renforce-sa-prise-sur-les-asteroides-geocroiseurs","title":{"rendered":"La NASA renforce sa prise sur les ast\u00e9ro\u00efdes g\u00e9ocroiseurs"},"content":{"rendered":"

Africa-Press – Tchad. <\/strong><\/span> Les scientifiques de l\u2019agence spatiale am\u00e9ricaine ont mis au point le programme Sentry II capable de calculer rapidement les probabilit\u00e9s d’impact pour tous les ast\u00e9ro\u00efdes g\u00e9ocroiseurs connus \u00e0 la fois.<\/p>\n

Cherchant \u00e0 s\u00e9curiser davantage la Terre contre les ast\u00e9ro\u00efdes g\u00e9ocroiseurs (NEA), dont le nombre est aujourd\u2019hui \u00e9valu\u00e9 \u00e0 pr\u00e8s de 28.000, les sp\u00e9cialistes de la NASA ont perfectionn\u00e9 l\u2019outil Sentry (Sentinel) qui permet d\u00e9sormais de pister tous les NEA en m\u00eame temps.<\/p>\n

D\u2019apr\u00e8s une \u00e9tude publi\u00e9e dans The Astronomical Journal, le programme, baptis\u00e9 Sentry II, est capable de calculer rapidement les probabilit\u00e9s d’impact pour tous les ast\u00e9ro\u00efdes g\u00e9ocroiseurs connus et d\u2019indiquer les objets les plus dangereux pour notre plan\u00e8te.<\/p>\n

Le programme analyse minutieusement tous les impacts potentiels, dont ceux qui n\u2019ont que quelques chances sur dix millions de se produire. \u00c0 la diff\u00e9rence de la version initiale, Sentry II prend en compte, pour calculer les trajectoires des objets suivis, des facteurs pr\u00e9c\u00e9demment ignor\u00e9s, notamment les forces non gravitationnelles, telles que les influences thermiques li\u00e9es \u00e0 la chaleur du Soleil.<\/p>\n

Chaque ann\u00e9e, 3.000 nouveaux ast\u00e9ro\u00efdes g\u00e9ocroiseurs sont d\u00e9tect\u00e9s. Pr\u00e9c\u00e9demment, la NASA avait annonc\u00e9 que l\u2019ast\u00e9ro\u00efde 4660 Nereus, class\u00e9 comme potentiellement dangereux, entrerait le 11 d\u00e9cembre dans l\u2019orbite terrestre, son point le plus proche de la plan\u00e8te bleue sur une p\u00e9riode de 20 ans.<\/p>\n

Fin novembre, l\u2019agence spatiale am\u00e9ricaine a envoy\u00e9 la sonde DART percuter un ast\u00e9ro\u00efde \u00e0 lavitesse de 24.000 km\/heure pour tenter de le d\u00e9vier de sa trajectoire dans le cadre d\u2019une mission in\u00e9dite destin\u00e9e \u00e0 tester un syst\u00e8me de d\u00e9fense plan\u00e9taire.<\/p>\n

L’ast\u00e9ro\u00efde vis\u00e9 par la mission, Dimorphos, ne repr\u00e9sente pourtant aucune menace pour la plan\u00e8te. Il sera percut\u00e9 \u00e0 une distance de 11 millions de kilom\u00e8tres de la Terre entre le 26 septembre et le 1er octobre 2022.<\/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. Les scientifiques de l\u2019agence spatiale am\u00e9ricaine ont mis au point le programme Sentry II capable de calculer rapidement les probabilit\u00e9s d’impact pour tous les ast\u00e9ro\u00efdes g\u00e9ocroiseurs connus \u00e0 la fois. Cherchant \u00e0 s\u00e9curiser davantage la Terre contre les ast\u00e9ro\u00efdes g\u00e9ocroiseurs (NEA), dont le nombre est aujourd\u2019hui \u00e9valu\u00e9 \u00e0 pr\u00e8s de 28.000, les […]<\/p>\n","protected":false},"author":82,"featured_media":15355,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,11,10],"tags":[37,292,2898,29],"class_list":["post-15356","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-geocroiseurs","tag-tchad"],"yoast_head":"\nLa NASA renforce sa prise sur les ast\u00e9ro\u00efdes g\u00e9ocroiseurs - tchad<\/title>\n<meta name=\"description\" content=\"Les scientifiques de l\u2019agence spatiale am\u00e9ricaine ont mis au point le programme Sentry II capable de calculer rapidemen ...\" \/>\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\/la-nasa-renforce-sa-prise-sur-les-asteroides-geocroiseurs\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La NASA renforce sa prise sur les ast\u00e9ro\u00efdes g\u00e9ocroiseurs\" \/>\n<meta property=\"og:description\" content=\"Les scientifiques de l\u2019agence spatiale am\u00e9ricaine ont mis au point le programme Sentry II capable de calculer rapidemen ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/la-nasa-renforce-sa-prise-sur-les-asteroides-geocroiseurs\" \/>\n<meta property=\"og:site_name\" content=\"tchad\" \/>\n<meta property=\"article:published_time\" content=\"2021-12-07T18:37:47+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-12-08T01:37:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2021\/12\/img-61afb5ec00a85.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\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=\"2 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\/la-nasa-renforce-sa-prise-sur-les-asteroides-geocroiseurs#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/la-nasa-renforce-sa-prise-sur-les-asteroides-geocroiseurs\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"La NASA renforce sa prise sur les ast\u00e9ro\u00efdes g\u00e9ocroiseurs\",\"datePublished\":\"2021-12-07T18:37:47+00:00\",\"dateModified\":\"2021-12-08T01:37:49+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/la-nasa-renforce-sa-prise-sur-les-asteroides-geocroiseurs\"},\"wordCount\":365,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/la-nasa-renforce-sa-prise-sur-les-asteroides-geocroiseurs#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2021\/12\/img-61afb5ec00a85.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Tchad\",\"g\u00e9ocroiseurs\",\"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\/la-nasa-renforce-sa-prise-sur-les-asteroides-geocroiseurs#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/la-nasa-renforce-sa-prise-sur-les-asteroides-geocroiseurs\",\"url\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/la-nasa-renforce-sa-prise-sur-les-asteroides-geocroiseurs\",\"name\":\"La NASA renforce sa prise sur les ast\u00e9ro\u00efdes g\u00e9ocroiseurs - 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