{"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\/fi\/rosetta_s_blind_date_with_asteroid_lutetia\/","title":{"rendered":"Rosettan sokkotreffit Lutetia-asteroidin kanssa"},"content":{"rendered":"<div class=\"lede\">\n<p>ESAn Rosetta-komeettaluotain on matkalla \u201dsokkotreffeille\u201d asteroidi Lutetian kanssa. Kuten monet ensitreffit, my\u00f6s Rosettan ja Lutetian kohtaaminen tapahtuu lauantai-iltana. Kukaan ei kuitenkaan viel\u00e4 tied\u00e4, milt\u00e4 Lutetia n\u00e4ytt\u00e4\u00e4 l\u00e4hiet\u00e4isyydelt\u00e4. On todenn\u00e4k\u00f6ist\u00e4, ett\u00e4 Lutetian pinta on hyvin ikivanha ja kraatterien peitt\u00e4m\u00e4, sill\u00e4 asteroidit ovat planeettojen muodostumisen j\u00e4ljilt\u00e4 j\u00e4\u00e4neit\u00e4 kivenpalasia.<\/p>\n<\/div>\n<p>T\u00e4st\u00e4 salaper\u00e4isest\u00e4 p\u00e4\u00e4asteroidivy\u00f6hykkeen j\u00e4senest\u00e4, joka kiert\u00e4\u00e4 Aurinkoa Marsin ja Jupiterin v\u00e4liss\u00e4, tiedet\u00e4\u00e4n vain v\u00e4h\u00e4n. Lutetia on kuitenkin ehdottomasti suurin asteroidi, jolla avaruusalus on t\u00e4h\u00e4n menness\u00e4 vieraillut. Alun perin sen halkaisijan arvioitiin olevan noin 95 km, mutta sen muodon katsottiin olevan vain hieman elliptinen (munanmuotoinen). Tuoreemman arvion mukaan se saattaa olla huomattavasti pitk\u00e4nomaisempi ja jopa 134 km leve\u00e4. Sen kirkkauden jatkuvat muutokset osoittavat selv\u00e4sti, ett\u00e4 Lutetia py\u00f6rii ja ett\u00e4 sen pinta on karhea.<\/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>Syv\u00e4n avaruuden horros ennen kohtaamista komeetan kanssa<\/figcaption><\/figure>\n<p>Toinen mysteeri liittyy siihen, mist\u00e4 asteroidi koostuu. Useimmat mittaukset viittaavat siihen, ett\u00e4 kyseess\u00e4 on \u2018C-tyyppinen\u2019 asteroidi, joka sis\u00e4lt\u00e4\u00e4 hiiliyhdisteit\u00e4. Joidenkin tutkimusten mukaan se saattaisi kuitenkin olla \u2018M-tyyppinen\u2019, eli metallipitoinen asteroidi.<\/p>\n<p>Vastaukset kaikkiin n\u00e4ihin kysymyksiin saadaan, kun Rosetta ohittaa avaruuskiven 3 200 kilometrin et\u00e4isyydelt\u00e4 10. hein\u00e4kuuta. Maahallintakeskus hienos\u00e4\u00e4t\u00e4\u00e4 huolellisesti avaruusaluksen lentorataa, jotta se pystyy l\u00e4hett\u00e4m\u00e4\u00e4n takaisin noin kahden tunnin verran yksityiskohtaisia kuvia. Avaruusluotain alkaa v\u00e4litt\u00f6m\u00e4sti l\u00e4hett\u00e4\u00e4 dataa takaisin Maahan, ja ensimm\u00e4iset kuvat julkaistaan my\u00f6hemmin samana iltana. Sen j\u00e4lkeen Rosetta suuntaa kohti toista ensitapaamistaan \u2013 t\u00e4ll\u00e4 kertaa Churyumov-Gerasimenko-komeetan kanssa \u2013 ja niiden j\u00e4nnitt\u00e4v\u00e4 kohtaaminen on odotettavissa vuonna 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\/fi\/wp-json\/wp\/v2\/posts\/1013","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/comments?post=1013"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1013\/revisions"}],"predecessor-version":[{"id":4796,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1013\/revisions\/4796"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=1013"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=1013"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=1013"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=1013"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=1013"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=1013"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=1013"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=1013"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=1013"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=1013"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}