{"id":85533,"date":"2024-04-27T15:03:17","date_gmt":"2024-04-27T15:03:17","guid":{"rendered":"https:\/\/www.africa-press.net\/burkina-faso\/politique\/des-astronomes-amateurs-decouvrent-1000-asteroides-en-epluchant-19-annees-de-cliches-dhubble"},"modified":"2024-04-27T15:42:13","modified_gmt":"2024-04-27T15:42:13","slug":"des-astronomes-amateurs-decouvrent-1000-asteroides-en-epluchant-19-annees-de-cliches-dhubble","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/des-astronomes-amateurs-decouvrent-1000-asteroides-en-epluchant-19-annees-de-cliches-dhubble","title":{"rendered":"Des astronomes amateurs d\u00e9couvrent 1000 ast\u00e9ro\u00efdes en \u00e9pluchant 19 ann\u00e9es de clich\u00e9s d&rsquo;Hubble"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Burkina Faso. <\/strong><\/span>La Ceinture principale d&rsquo;aste\u0301roi\u0308des est situe\u0301e entre Mars et Jupiter, a\u0300 environ 2,7 unite\u0301s astronomiques (UA) du Soleil. Elle abrite des millions d&rsquo;aste\u0301roi\u0308des de toute taille dont certains tre\u0300s gros, comme la plane\u0300te naine Ce\u0301re\u0300s, explore\u0301e en 2015 par la sonde Dawn. Au sein de cette ceinture, les collisions sont nombreuses et les chocs entre deux aste\u0301roi\u0308des donnent naissance a\u0300 de nouveaux astres plus petits. C&rsquo;est la cate\u0301gorie des moins de un kilome\u0300tre de diame\u0300tre que le te\u0301lescope Hubble a contribue\u0301 a\u0300 comple\u0301ter.<\/p>\n<p><b>19 anne\u0301es de cliche\u0301s passe\u0301es en revue<\/b><\/p>\n<p>Pour de\u0301couvrir ces petits aste\u0301roi\u0308des, les scientifiques n&rsquo;ont pas programme\u0301 de nouvelles observations: ils sont remonte\u0301s dans le temps et ont analyse\u0301 pre\u0300s de 37.000 cliche\u0301s, des prises de vue qui re\u0301capitulent les 19 dernie\u0300res anne\u0301es de fonctionnement du te\u0301lescope. Ces images ne sont pas non plus centre\u0301es sur la Ceinture principale mais sur de lointains objets comme des e\u0301toiles, des galaxies ou des ne\u0301buleuses.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"254\" class=\"alignnone wp-image-85530 size-full\" src=\"https:\/\/static.africa-press.net\/burkina\/sites\/42\/2024\/04\/sm_1714219737.43899.jpg\" srcset=\"https:\/\/static.africa-press.net\/burkina\/sites\/42\/2024\/04\/sm_1714219737.43899.jpg 453w, https:\/\/static.africa-press.net\/burkina\/sites\/42\/2024\/04\/sm_1714219737.43899-300x168.jpg 300w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><\/p>\n<p>En fait, ce sont leurs imperfections qui les renseignent. En effet, ces petits corps rocheux peuvent traverser le champ de vision du te\u0301lescope, ils apparaissent alors comme de petits traits blancs sur les images (et pas comme des points car Hubble se de\u0301place autour de la Terre). Les astronomes parlent de \u00ab\u00a0photobombes\u00a0\u00bb.<\/p>\n<p>Vu au de\u0301part comme des arte\u0301facts ge\u0302nants, ces traine\u0301es ont e\u0301te\u0301 utilise\u0301es pour caracte\u0301riser de nouveaux aste\u0301roi\u0308des dans le cadre du projet \u00ab\u00a0Hubble Asteroid Hunter\u00a0\u00bb. L&rsquo;initiative a e\u0301te\u0301 de\u0301veloppe\u0301e par des chercheurs et des inge\u0301nieurs du Centre europe\u0301en des sciences et technologies (ESTEC) et du Centre europe\u0301en d&rsquo;astronomie spatiale (ESDC), en collaboration avec la plateforme Zooniverse, un site qui collationne les projets participatifs scientifiques.<\/p>\n<p>Lance\u0301 en 2019, le projet a inte\u0301gre\u0301, en tout, 11.482 volontaires qui ont analyse\u0301 plus de deux millions d&rsquo;images et ont se\u0301lectionne\u0301 les plus prometteuses. Un algorithme a ensuite e\u0301te\u0301 entraine\u0301 pour utiliser pour proce\u0301der a\u0300 l&rsquo;identification des traine\u0301es d&rsquo;aste\u0301roi\u0308des.<\/p>\n<p><b>Une nouvelle population d&rsquo;aste\u0301roi\u0308des<\/b><\/p>\n<p>En connaissant la position de Hubble lors de l&rsquo;observation et en mesurant la courbure des stries, les scientifiques peuvent de\u0301terminer les distances de chaque aste\u0301roi\u0308de et estimer la forme de leurs orbites. La quasi-totalite\u0301 des nouveaux venus re\u0301side dans la Ceinture principale et en mesurant leur luminosite\u0301, il est possible d&rsquo;estimer leur taille.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"254\" class=\"alignnone wp-image-85531 size-full\" src=\"https:\/\/static.africa-press.net\/burkina\/sites\/42\/2024\/04\/sm_1714219754.929581.jpg\" srcset=\"https:\/\/static.africa-press.net\/burkina\/sites\/42\/2024\/04\/sm_1714219754.929581.jpg 453w, https:\/\/static.africa-press.net\/burkina\/sites\/42\/2024\/04\/sm_1714219754.929581-300x168.jpg 300w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><\/p>\n<p>En tout, le projet a permis de repe\u0301rer 1.701 traces d\u2019aste\u0301roi\u0308des, dont 1.031 non catalogue\u0301es. Environ 400 de ces aste\u0301roi\u0308des nouvellement de\u0301couverts mesurent moins d\u2019un kilome\u0300tre. Ils sont probablement issus de collisions avec des corps plus gros qui se sont entrechoque\u0301s depuis l&rsquo;e\u0301poque de leur formation, qui remonte au de\u0301but du syste\u0300me solaire, il y a 4,6 milliards d&rsquo;anne\u0301es. Les re\u0301sultats de ce travail sont publie\u0301s dans la revue Astronomy &amp; Astrophysics.<\/p>\n<p>Devant le succe\u0300s de cette me\u0301thode de recherche, les astronomes ont de\u0301cide\u0301 de continuer a\u0300 exploiter l&rsquo;immense ressource que forment les scientifiques amateurs pour mieux caracte\u0301riser les aste\u0301roi\u0308des de la Ceinture principale. Une nouvelle ite\u0301ration d&rsquo;Hubble Asteroid Hunter devrait donc e\u0302tre en ligne prochainement.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/burkina-faso\">Burkina Faso<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Burkina Faso. La Ceinture principale d&rsquo;aste\u0301roi\u0308des est situe\u0301e entre Mars et Jupiter, a\u0300 environ 2,7 unite\u0301s astronomiques (UA) du Soleil. Elle abrite des millions d&rsquo;aste\u0301roi\u0308des de toute taille dont certains tre\u0300s gros, comme la plane\u0300te naine Ce\u0301re\u0300s, explore\u0301e en 2015 par la sonde Dawn. Au sein de cette ceinture, les collisions sont nombreuses [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":85532,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[111,725,29],"class_list":["post-85533","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-burkina-faso","tag-burkina-faso"],"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>Des astronomes amateurs d\u00e9couvrent 1000 ast\u00e9ro\u00efdes en \u00e9pluchant 19 ann\u00e9es de clich\u00e9s d&#039;Hubble - Burkina Faso<\/title>\n<meta name=\"description\" content=\"La Ceinture principale d&#039;aste\u0301roi\u0308des est situe\u0301e entre Mars et Jupiter, a\u0300 environ 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