{"id":95859,"date":"2025-03-02T17:45:21","date_gmt":"2025-03-02T17:45:21","guid":{"rendered":"https:\/\/www.africa-press.net\/cotedivoire\/politique\/la-sonde-lucy-sapproche-de-sa-deuxieme-cible"},"modified":"2025-03-02T17:45:21","modified_gmt":"2025-03-02T17:45:21","slug":"la-sonde-lucy-sapproche-de-sa-deuxieme-cible","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/la-sonde-lucy-sapproche-de-sa-deuxieme-cible","title":{"rendered":"La sonde Lucy s’approche de sa deuxi\u00e8me cible"},"content":{"rendered":"

Africa-Press – C\u00f4te d’Ivoire. <\/strong><\/span>Lance\u0301e en octobre 2021, la sonde Lucy doit explorer les aste\u0301roi\u0308des troyens de Jupiter, des corps qui partagent la me\u0302me orbite qu\u2019une plane\u0300te mais se situent juste devant ou juste derrie\u0300re elle. Sur sa route tortueuse, avec une trajectoire en forme de \u00ab\u00a0bretzel\u00a0\u00bb , la sonde devait croiser deux aste\u0301roi\u0308des de la ceinture principale d’aste\u0301roi\u0308des, situe\u0301e entre Mars et Jupiter.<\/p>\n

Deuxie\u0300me e\u0301tape le 20 avril<\/b><\/p>\n

Le premier aste\u0301roi\u0308de, (152830) Dinkinesh, a e\u0301te\u0301 survole\u0301 le 1er novembre 2023. Les images de la sonde ont permis de constater qu’il se composait d’un gros corps de 790 me\u0300tres de large et de deux petites lunes qui ont presque fusionne\u0301es et faisant chacune la me\u0302me taille, respectivement 210 et 230 me\u0300tres de diame\u0300tre. Elles orbitent a\u0300 3,1 kilome\u0300tres et font le tour du gros corps en 52,7 heures.<\/p>\n

Le 20 avril 2025, ce sera au tour de l’aste\u0301roi\u0308de (52246) Donaldjohanson d’e\u0302tre survole\u0301 par la sonde Lucy. L’astre porte le nom de Donald Johanson, l’un des trois de\u0301couvreurs du fossile de l’australopithe\u0300que Lucy, extrait du sol e\u0301thiopien en 1974, avec Yves Coppens et Maurice Taieb.<\/p>\n

L’astre a e\u0301te\u0301 de\u0301couvert en 1981 a\u0300 l’observatoire de Siding Spring, en Australie. Il mesure environ 3,8 km de diame\u0300tre et pour le moment, il n’y en a aucune image distincte. Un proble\u0300me qui sera re\u0301solu dans quelques semaines.<\/p>\n

En route vers Jupiter<\/b><\/p>\n

La sonde Lucy a e\u0301te\u0301 construite pour aller explorer les aste\u0301roi\u0308des troyens de Jupiter. Les troyens repre\u0301sentent une classe d’aste\u0301roi\u0308des qui partagent la me\u0302me orbite qu\u2019une plane\u0300te, se plac\u0327ant juste devant ou juste derrie\u0300re. Ils ne risquent cependant pas d\u2019entrer en collision avec l’astre qu\u2019ils pre\u0301ce\u0300dent ou poursuivent car leurs orbites sont stables. Plusieurs plane\u0300tes du syste\u0300me solaire comme Neptune, Mars et Jupiter posse\u0300dent de tels compagnons et la Terre est accompagne\u0301e par au moins deux de ces petits corps, re\u0301cemment de\u0301couverts.<\/p>\n

Les troyens, qui sont des cailloux tre\u0300s sombres mais pouvant arborer diverses teintes, sont vieux de plusieurs milliards d’anne\u0301es. Ils ont la me\u0302me composition que les briques qui ont forme\u0301 les plane\u0300tes rocheuses du syste\u0300me solaire et leur e\u0301tude permettra donc de mieux comprendre comment celui-ci s’est organise\u0301.<\/p>\n

Pour plus d’informations et d’analyses sur la C\u00f4te d’Ivoire<\/span>, suivez Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – C\u00f4te d’Ivoire. Lance\u0301e en octobre 2021, la sonde Lucy doit explorer les aste\u0301roi\u0308des troyens de Jupiter, des corps qui partagent la me\u0302me orbite qu\u2019une plane\u0300te mais se situent juste devant ou juste derrie\u0300re elle. Sur sa route tortueuse, avec une trajectoire en forme de \u00ab\u00a0bretzel\u00a0\u00bb , la sonde devait croiser deux aste\u0301roi\u0308des de […]<\/p>\n","protected":false},"author":82,"featured_media":95858,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[37],"class_list":["post-95859","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-cote-divoire-2"],"yoast_head":"\nLa sonde Lucy s'approche de sa deuxi\u00e8me cible - C\u00f4te d'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\/la-sonde-lucy-sapproche-de-sa-deuxieme-cible\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La sonde Lucy s'approche de sa deuxi\u00e8me cible\" \/>\n<meta property=\"og:description\" content=\"Africa-Press – C\u00f4te d’Ivoire. Lance\u0301e en octobre 2021, la sonde Lucy doit explorer les aste\u0301roi\u0308des troyens de Jupiter, des corps qui partagent la me\u0302me orbite qu\u2019une plane\u0300te mais se situent juste devant ou juste derrie\u0300re elle. 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