{"id":981,"date":"2008-09-04T07:56:00","date_gmt":"2008-09-04T05:56:00","guid":{"rendered":"https:\/\/kids.esa.int\/rosetta_zooms_past_a_rare_asteroid\/"},"modified":"2026-10-08T00:34:29","modified_gmt":"2026-10-07T22:34:29","slug":"rosetta_zooms_past_a_rare_asteroid","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/rosetta_zooms_past_a_rare_asteroid\/","title":{"rendered":"Un ast\u00e9ro\u00efde rare sous l\u2019objectif de Rosetta"},"content":{"rendered":"<div class=\"lede\">\n<p>La sonde Rosetta de l\u2019ESA poursuit son p\u00e9riple en direction de la com\u00e8te avec laquelle elle a rendez-vous en 2014. Au cours de ce trekking spatial de dix ans, Rosetta effectuera deux incursions dans la ceinture d\u2019ast\u00e9ro\u00efdes situ\u00e9e entre Mars et Jupiter. Appel\u00e9e \u00e0 passer dans l\u2019histoire, sa premi\u00e8re rencontre avec un ast\u00e9ro\u00efde aura lieu le 5 septembre \u00e0 20h58 CEST (heure d\u2019\u00e9t\u00e9 d\u2019Europe centrale).<\/p>\n<\/div>\n<p>Depuis son lancement en mars 2004, Rosetta a d\u00e9j\u00e0 parcouru quelques 3 700 millions de km, soit plus de deux fois la distance qui s\u00e9pare la Terre du Soleil. Si la sonde europ\u00e9enne a d\u00e9j\u00e0 survol\u00e9 la Terre (\u00e0 deux reprises) et Mars, son prochain passage \u00e0 proximit\u00e9 du petit ast\u00e9ro\u00efde rocheux nomm\u00e9 Steins va lui permettre d\u2019utiliser pour la premi\u00e8re fois ses instruments scientifiques.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"1323\" data-credit=\"ESA, image by C.Carreau\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2008\/09\/Artist_s_impression_of_asteroid_2867_Steins2\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2008\/09\/artist_s_impression_of_asteroid_2867_steins2\/17884620-2-eng-GB\/Artist_s_impression_of_asteroid_2867_Steins.jpg\" alt=\"Artist\u2019s impression of asteroid (2867) Steins\"><figcaption>Repr\u00e9sentation artistique de l'ast\u00e9ro\u00efde (2867) Steins<\/figcaption><\/figure>\n<p>Rosetta va fr\u00f4ler Steins \u00e0 une vitesse de pr\u00e8s de 31 000 km\/heure. Depuis d\u00e9but ao\u00fbt, les clich\u00e9s pris par les appareils-photos de la sonde ont permis de suivre Steins et d\u2019en d\u00e9terminer la trajectoire. Gr\u00e2ce \u00e0 ces donn\u00e9es, Rosetta ne devrait passer qu\u2019\u00e0 800 km de sa cible. Les contr\u00f4leurs du Centre europ\u00e9en d\u2019op\u00e9rations spatiales (ESOC) de l\u2019ESA situ\u00e9 \u00e0 Darmstadt (Allemagne) devront quant \u00e0 eux patienter jusqu\u2019\u00e0 22h23 CEST pour \u00e9tablir un premier contact avec Rosetta et confirmer la r\u00e9ussite du survol.<\/p>\n<p>Steins, qui a \u00e9t\u00e9 d\u00e9couvert en 1969, ne mesure que quelques kilom\u00e8tres de diam\u00e8tre. Ses changements de luminosit\u00e9 r\u00e9guliers montrent que l\u2019ast\u00e9ro\u00efde tourne sur lui-m\u00eame en \u00e0 peu pr\u00e8s 6 heures. Les chercheurs souhaitent vivement en apprendre davantage sur ce monde miniature car il s\u2019agit d\u2019un type d\u2019ast\u00e9ro\u00efde relativement rare. Les objets tels que Steins sont, en effet, des r\u00e9sidus issus de la formation des plan\u00e8tes il y a 4,5 milliards d\u2019ann\u00e9es. Les \u00e9tudier nous permet d\u2019en savoir plus sur la naissance de la Terre et des autres plan\u00e8tes de notre syst\u00e8me solaire.<\/p>","protected":false},"excerpt":{"rendered":"<p>ESA\u2019s Rosetta spacecraft is on its way to a rendezvous with a comet in 2014. During its 10-year trek through deep space, Rosetta will make two visits to the main [&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\/2008\/09\/artist_s_impression_of_rosetta_as_it_flies_by_asteroid_steins4\/17900421-2-eng-GB\/Artist_s_impression_of_Rosetta_as_it_flies_by_asteroid_Steins.jpg","esa_banner_description":"Artist\u2019s impression of Rosetta as it flies by asteroid Steins","esa_banner_credit":"ESA, image by C.Carreau","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2008\/09\/Artist_s_impression_of_Rosetta_as_it_flies_by_asteroid_Steins4","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":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-981","post","type-post","status-publish","format-standard","hentry","category-comets-and-meteors","category-learn","category-our-universe"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/981","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=981"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/981\/revisions"}],"predecessor-version":[{"id":4773,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/981\/revisions\/4773"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=981"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=981"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=981"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=981"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=981"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=981"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=981"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=981"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=981"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=981"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}