{"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\/fi\/rosetta_zooms_past_a_rare_asteroid\/","title":{"rendered":"Rosetta ohittaa harvinaisen asteroidin suurella nopeudella"},"content":{"rendered":"<div class=\"lede\">\n<p>ESAn Rosetta-avaruusluotain on matkalla kohti kohtaamista komeetan kanssa vuonna 2014. Kymmenvuotisen matkansa aikana avaruuden syvyyksiss\u00e4 Rosetta vierailee kahdesti Marsin ja Jupiterin v\u00e4liss\u00e4 sijaitsevalla p\u00e4\u00e4asteroidivy\u00f6hykkeell\u00e4. Sen ensimm\u00e4inen historiallinen kohtaaminen asteroidin kanssa tapahtuu 5. syyskuuta klo 20.58 CEST (Keski-Euroopan kes\u00e4aika).<\/p>\n<\/div>\n<p>Maaliskuussa 2004 tapahtuneen laukaisunsa j\u00e4lkeen Rosetta on kulkenut noin 3 700 miljoonaa kilometri\u00e4. Se on t\u00e4ll\u00e4 hetkell\u00e4 yli kaksi kertaa niin kaukana Auringosta kuin Maa. Avaruusluotain on jo ohittanut Maan (kahdesti) ja Marsin, mutta sen ohilento pienen, kivisen Steins-nimisen asteroidin ohi tarjoaa ensimm\u00e4isen todellisen tilaisuuden k\u00e4ytt\u00e4\u00e4 sen tieteellisi\u00e4 mittalaitteita.<\/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>Taiteilijan n\u00e4kemys asteroidista (2867) Steins<\/figcaption><\/figure>\n<p>Rosetta ohittaa Steinsin noin 31 000 km:n tuntinopeudella. Elokuun alusta l\u00e4htien sen kameroiden ottamia kuvia on k\u00e4ytetty Steinsin seurantaan ja sen sijainnin m\u00e4\u00e4ritt\u00e4miseen. T\u00e4m\u00e4n ansiosta avaruusalus ohittaa kohteensa vain 800 km:n et\u00e4isyydelt\u00e4. Valitettavasti ESA:n Euroopan avaruusoperaatiokeskuksen lennonjohtajat Darmstadtissa, Saksassa, joutuvat odottamaan kello 22.23 CEST:t\u00e4, ennen kuin he saavat ensimm\u00e4isen yhteyden Rosettaan ja vahvistuksen ohilennon onnistumisesta.<\/p>\n<p>Steins l\u00f6ydettiin vuonna 1969, ja sen halkaisija on vain muutama kilometri. Sen kirkkauden s\u00e4\u00e4nn\u00f6lliset vaihtelut osoittavat, ett\u00e4 se py\u00f6rii noin kerran 6 tunnissa. Tutkijat ovat innokkaita oppimaan lis\u00e4\u00e4 t\u00e4st\u00e4 pienest\u00e4 maailmasta, koska se edustaa suhteellisen harvinaista asteroidityyppi\u00e4. Steinsin kaltaiset kohteet ovat j\u00e4\u00e4nteit\u00e4 planeettojen syntyajalta, 4,5 miljardia vuotta sitten. Tutkimalla niit\u00e4 voimme oppia lis\u00e4\u00e4 Maan ja muiden aurinkokunnan planeettojen muodostumisesta.<\/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\/fi\/wp-json\/wp\/v2\/posts\/981","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=981"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/981\/revisions"}],"predecessor-version":[{"id":4773,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/981\/revisions\/4773"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=981"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=981"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=981"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=981"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=981"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=981"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=981"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=981"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=981"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=981"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}