{"id":71153,"date":"2025-09-14T12:00:00","date_gmt":"2025-09-14T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/decouverte-dun-asteroide-cache-autour-de-la-terre"},"modified":"2025-09-14T23:24:13","modified_gmt":"2025-09-14T23:24:13","slug":"decouverte-dun-asteroide-cache-autour-de-la-terre","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dun-asteroide-cache-autour-de-la-terre","title":{"rendered":"D\u00e9couverte D\u2019Un Ast\u00e9ro\u00efde Cach\u00e9 Autour de la Terre"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span><b>Dans l\u2019ombre de notre Terre, les astronomes viennent de remarquer un objet qui a e\u0301veille\u0301 leur inte\u0301re\u0302t. Ni tout a\u0300 fait e\u0301tranger, ni tout a\u0300 fait lune. En tout cas, un objet qui se de\u0301marque des autres&#8230;<\/b><\/p>\n<p>Il y a quelques jours a\u0300 peine, notre Lune faisait la Une. Parce qu\u2019elle s\u2019e\u0301clipsait de notre ciel pour quelques instants magiques.<\/p>\n<p>Aujourd\u2019hui, c\u2019est un autre de nos compagnons de voyage qui fait parler de lui. Ou pluto\u0302t d\u2019elle, encore. Puisqu\u2019il s\u2019agit d\u2019une quasi-lune, comme les appellent les astronomes. Un objet qui semble orbiter autour de notre Terre. Mais les apparences sont parfois trompeuses. Et c\u2019est effectivement le cas pour 2025 PN7. Influence\u0301e par la gravite\u0301 de notre plane\u0300te, elle suit en re\u0301alite\u0301 une orbite similaire a\u0300 la no\u0302tre autour du Soleil.<\/p>\n<p><b>Presque une nouvelle Lune, mais pas tout a\u0300 fait<\/b><\/p>\n<p>Des astronomes de l\u2019observatoire Pan-STARRS a\u0300 Hawai\u0308 ont de\u0301couvert ce nouveau quasi-satellite au de\u0301but du mois d\u2019aou\u0302t dernier. Dans les Notes de recherche de l\u2019Union ame\u0301ricaine d\u2019astronomie, ils pre\u0301cisent que leur analyse de ses donne\u0301es orbitales montre que 2025 PN7 \u2013 un objet dont le diame\u0300tre est estime\u0301 a\u0300 moins de 20 me\u0300tres et la magnitude de l\u2019ordre de 26 \u2013 est de\u0301ja\u0300 sur une quasi-orbite depuis environ 60 ans. Et qu\u2019il le restera encore probablement autant. Cela reste assez peu. La quasi-lune Kamo\u2019oalewa a une orbite terrestre estime\u0301e a\u0300 environ 381 ans, par exemple.<\/p>\n<p>Les chercheurs classent la nouvelle de\u0301couverte dans la cate\u0301gorie des Arjunas, un petit groupe de petits aste\u0301roi\u0308des qui sont en re\u0301sonance avec l\u2019orbite de notre Terre sans e\u0302tre re\u0301ellement en orbite autour, me\u0302me si les plus proches d\u2019entre eux peuvent se trouver temporairement capture\u0301s par notre Plane\u0300te. Ils deviennent alors des mini-lunes. 2025 PN7, elle, se maintient a\u0300 une distance de notre Terre comprise entre 4,5 et 59 millions de kilome\u0300tres.<\/p>\n<p><b>Re\u0301ve\u0301ler les secrets de notre Syste\u0300me solaire<\/b><\/p>\n<p>Actuellement, six autres quasi-lunes sont connues des astronomes: 164 207 Cardea (2004 GU9), 469 219 Kamo\u2019oalewa (2016 HO3), 277 810 (2006 FV35), 2013 LX28, 2014 OL339 et 2023 FW13. Ils suivent avec attention ce type d\u2019objet ge\u0301ocroiseur, car ils pourraient se re\u0301ve\u0301ler importants pour la de\u0301fense plane\u0301taire et de futures missions spatiales. Une mission est me\u0302me de\u0301ja\u0300 pre\u0301vue en direction de Kamo\u2019oalewa, pour en rapporter des e\u0301chantillons d\u2019ici 2027 et peut-e\u0302tre en apprendre un peu plus sur l\u2019origine de notre Syste\u0300me solaire.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Senegal<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Senegal. Dans l\u2019ombre de notre Terre, les astronomes viennent de remarquer un objet qui a e\u0301veille\u0301 leur inte\u0301re\u0302t. Ni tout a\u0300 fait e\u0301tranger, ni tout a\u0300 fait lune. En tout cas, un objet qui se de\u0301marque des autres&#8230; Il y a quelques jours a\u0300 peine, notre Lune faisait la Une. Parce qu\u2019elle s\u2019e\u0301clipsait [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":71152,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-71153","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-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>D\u00e9couverte D\u2019Un Ast\u00e9ro\u00efde Cach\u00e9 Autour de la Terre - Senegal<\/title>\n<meta name=\"description\" content=\"Dans l\u2019ombre de notre Terre, les astronomes viennent de remarquer un objet qui a e\u0301veille\u0301 leur inte\u0301re\u0302t. 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