{"id":186,"date":"2021-12-02T12:48:59","date_gmt":"2021-12-02T11:48:59","guid":{"rendered":"https:\/\/kids.esa.int\/spot_the_asteroids3\/"},"modified":"2026-10-08T00:25:15","modified_gmt":"2026-10-07T22:25:15","slug":"spot_the_asteroids3","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/spot_the_asteroids3\/","title":{"rendered":"Trouve les ast\u00e9ro\u00efdes !"},"content":{"rendered":"<div class=\"lede\">\n<p>T'es-tu d\u00e9j\u00e0 demand\u00e9 comment c'est d'\u00eatre astronome professionnel et d'analyser des donn\u00e9es satellites \u00e0 la recherche de nouveaux mondes ? L'occasion t'es maintenant donn\u00e9e de rechercher des ast\u00e9ro\u00efdes \u00e0 l'instar des astronomes !<\/p>\n<\/div>\n<p>Ce court film a \u00e9t\u00e9 r\u00e9alis\u00e9 par l'observatoire spatial japonais AKARI. Il met en sc\u00e8ne l'ast\u00e9ro\u00efde g\u00e9ocroiseur Itokawa (la tache lumineuse proche du centre) film\u00e9 par la cam\u00e9ra \u00e0 infrarouge d'AKARI. La proximit\u00e9 relative de l'ast\u00e9ro\u00efde par rapport \u00e0 la Terre est trahie par son d\u00e9placement rapide sur une p\u00e9riode de 12 minutes. Sa luminosit\u00e9 est \u00e9galement li\u00e9e \u00e0 ses \u00e9missions infrarouges (thermiques). (Des donn\u00e9es de ce type sont utilis\u00e9es pour la d\u00e9termination de la taille des ast\u00e9ro\u00efdes susceptibles de se trouver t\u00f4t ou tard sur une trajectoire de collision avec la Terre.)<\/p>\n<p>Itokawa n'est pas le seul rocher spatial apparaissant dans ce film. On peut \u00e9galement y apercevoir deux ast\u00e9ro\u00efdes bien moins visibles se d\u00e9pla\u00e7ant lentement dans le ciel. L'orbite de l'un de ces ast\u00e9ro\u00efdes est similaire \u00e0 celle d'Itokawa. Es-tu capable de les trouver (et suffisamment patient pour ce faire) ? Note que les \u00e9toiles semblent scintiller dans la vid\u00e9o. Les images de ce film sont \"brutes\", comme celles utilis\u00e9es par les astronomes dans le cadre de leurs recherches. De nombreuses rayures et tra\u00een\u00e9es provoqu\u00e9es par les rayons cosmiques y sont clairement visibles, de m\u00eame que d'autres effets.<\/p>\n<p>Lorsque cette vid\u00e9o a \u00e9t\u00e9 tourn\u00e9e, le 26 juillet 2021, Itokawa se trouvait dans la constellation du Scorpion. L'ast\u00e9ro\u00efde et la Terre \u00e9taient alors \u00e0 leur point le plus proche l'un de l'autre, \u00e0 environ 42 millions de km de distance. (\u00c0 titre de comparaison, la Terre se trouve \u00e0 150 millions de km du Soleil.)<\/p>\n<p>V\u00e9rifie tes r\u00e9ponses<\/p>","protected":false},"excerpt":{"rendered":"<p>Have you ever wondered what it is like to be a professional astronomer, searching through spacecraft data in search of new worlds? Well, here\u2019s your chance to hunt for asteroids [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2007\/08\/motion_of_itokawa\/17872114-2-eng-GB\/Motion_of_Itokawa.png","esa_banner_description":"Motion of Itokawa","esa_banner_credit":"JAXA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2007\/08\/Motion_of_Itokawa","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[46,10,11],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-186","post","type-post","status-publish","format-standard","hentry","category-comets-and-meteors","category-learn","category-our-universe","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/186","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/comments?post=186"}],"version-history":[{"count":2,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/186\/revisions"}],"predecessor-version":[{"id":3942,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/186\/revisions\/3942"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=186"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=186"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=186"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=186"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=186"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=186"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=186"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=186"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=186"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=186"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}