{"id":1013,"date":"2010-06-17T09:31:00","date_gmt":"2010-06-17T07:31:00","guid":{"rendered":"https:\/\/kids.esa.int\/rosetta_s_blind_date_with_asteroid_lutetia\/"},"modified":"2026-10-08T00:34:52","modified_gmt":"2026-10-07T22:34:52","slug":"rosetta_s_blind_date_with_asteroid_lutetia","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/rosetta_s_blind_date_with_asteroid_lutetia\/","title":{"rendered":"Premier rendez-vous de Rosetta avec l\u2019ast\u00e9ro\u00efde Lutetia"},"content":{"rendered":"<div class=\"lede\">\n<p>Le chasseur de com\u00e8tes de l\u2019ESA, la sonde Rosetta, est en route pour son premier rendez-vous surprise avec l\u2019ast\u00e9ro\u00efde Lutetia. Comme de nombreux premiers rendez-vous, Rosetta rencontrera Lutetia un samedi soir. Cependant, personne ne sait \u00e0 quoi ressemble Lutetia de pr\u00e8s. Il est possible que sa face soit tr\u00e8s ancienne et creus\u00e9e de crat\u00e8res car les ast\u00e9ro\u00efdes sont des corps rocheux issus de la formation des plan\u00e8tes.<\/p>\n<\/div>\n<p>Nous en savons peu sur ce myst\u00e9rieux composant de la principale ceinture d\u2019ast\u00e9ro\u00efdes, qui orbite autour du Soleil entre Mars et Jupiter. Une chose est s\u00fbre, Lutetia est sans aucun doute le plus gros ast\u00e9ro\u00efde \u00e0 recevoir la visite d\u2019une sonde spatiale. L\u2019on pensait \u00e0 l\u2019origine qu\u2019il ne mesurait que 95 km de large et n\u2019\u00e9tait que l\u00e9g\u00e8rement elliptique (en forme d\u2019\u0153uf). Une \u00e9valuation plus r\u00e9cente a cependant sugg\u00e9r\u00e9 que Lutetia \u00e9tait bien plus allong\u00e9 et mesurait jusqu\u2019\u00e0 134 km de large. Ses changements de luminosit\u00e9 constants indiquent, par ailleurs, clairement que l\u2019ast\u00e9ro\u00efde est en rotation et a une surface irr\u00e9guli\u00e8re.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"2589\" data-credit=\"ESA, image by AOES Medialab\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2002\/11\/Deep-space_hibernation_before_comet_rendezvous2\" 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\/2002\/11\/deep-space_hibernation_before_comet_rendezvous2\/17864862-3-eng-GB\/Deep-space_hibernation_before_comet_rendezvous.jpg\" alt=\"Deep-space hibernation before comet rendezvous\"><figcaption>Hibernation dans l'espace lointain avant la rencontre avec la com\u00e8te<\/figcaption><\/figure>\n<p>Un autre myst\u00e8re de Lutetia est sa constitution. La plupart des mesures indiquent qu\u2019il s\u2019agit d\u2019un ast\u00e9ro\u00efde de \u00ab type C \u00bb qui contiendrait des compos\u00e9s carbon\u00e9s. Cependant d\u2019autres \u00e9tudes penchent pour le \u00ab type M \u00bb, riche en m\u00e9taux.<\/p>\n<p>Les r\u00e9ponses \u00e0 toutes ces questions seront connues lorsque Rosetta s\u2019approchera \u00e0 moins de 3 200 km de l\u2019ast\u00e9ro\u00efde, le 10 juillet. Les contr\u00f4leurs au sol ajustent minutieusement la trajectoire de la sonde afin qu\u2019elle puisse transmettre environ deux heures d\u2019images d\u00e9taill\u00e9es. La sonde commencera imm\u00e9diatement \u00e0 transmettre les donn\u00e9es vers la Terre et les premi\u00e8res images seront diffus\u00e9es plus tard dans la soir\u00e9e. Rosetta se dirigera ensuite vers un autre premier rendez-vous \u2013 cette fois avec la com\u00e8te Churyumov-Gerasimenko \u2013 dont la rencontre passionnante est pr\u00e9vue en 2014.<\/p>","protected":false},"excerpt":{"rendered":"<p>ESA\u2019s Rosetta comet-chaser is heading for a blind date with asteroid Lutetia. Like many first dates, Rosetta will meet Lutetia on a Saturday night. However, no one yet knows what [&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_steins3\/17896349-2-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_Steins3","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":[26],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-1013","post","type-post","status-publish","format-standard","hentry","category-news"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1013","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=1013"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1013\/revisions"}],"predecessor-version":[{"id":4796,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1013\/revisions\/4796"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=1013"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=1013"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=1013"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=1013"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=1013"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=1013"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=1013"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=1013"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=1013"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=1013"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}