{"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\/fi\/spot_the_asteroids3\/","title":{"rendered":"Etsi asteroidit!"},"content":{"rendered":"
\n

Oletko koskaan miettinyt, millaista on olla ammattitason t\u00e4htitieteilij\u00e4, joka tutkii avaruusluotainten tietoja etsiess\u00e4\u00e4n uusia maailmoja? No, t\u00e4ss\u00e4 on tilaisuutesi etsi\u00e4 asteroideja aivan kuten t\u00e4htitieteilij\u00e4t tekev\u00e4t!<\/p>\n<\/div>\n

T\u00e4m\u00e4n lyhyen videon on kuvannut japanilainen AKARI-avaruusobservatorio. Siin\u00e4 n\u00e4kyy Maan l\u00e4hell\u00e4 kiert\u00e4v\u00e4 asteroidi Itokawa \u2013 kirkas t\u00e4pl\u00e4 l\u00e4hell\u00e4 keskustaa \u2013 AKARIn infrapunakameran kuvaamana. Asteroidin suhteellisen l\u00e4heinen sijainti Maahan n\u00e4hden paljastuu sen nopeasta liikkeest\u00e4 12 minuutin aikana. Sen kirkkaus liittyy my\u00f6s sen infrapuna- (l\u00e4mp\u00f6-) s\u00e4teilyyn. (T\u00e4llaisia tietoja k\u00e4ytet\u00e4\u00e4n saadakseen paremman k\u00e4sityksen niiden asteroidien koosta, jotka saattaisivat jonain p\u00e4iv\u00e4n\u00e4 olla t\u00f6rm\u00e4yskurssilla Maahan.)<\/p>\n

Itokawa ei ole ainoa avaruuskivi t\u00e4ss\u00e4 elokuvassa. Mukana on my\u00f6s kaksi paljon himme\u00e4mp\u00e4\u00e4 asteroidia, jotka liikkuvat hitaasti taivaalla. Toinen niist\u00e4 kiert\u00e4\u00e4 samansuuntaisesti kuin Itokawa. Onko sinulla k\u00e4rsiv\u00e4llisyytt\u00e4 ja kyky\u00e4 l\u00f6yt\u00e4\u00e4 ne? Huomaa, ett\u00e4 t\u00e4hdet n\u00e4ytt\u00e4v\u00e4t v\u00e4lkkyv\u00e4n videossa. T\u00e4m\u00e4n videon kuvat ovat k\u00e4sittelem\u00e4tt\u00f6mi\u00e4, sellaisia, joita t\u00e4htitieteilij\u00e4t itse k\u00e4ytt\u00e4v\u00e4t tutkimuksessaan. Niiss\u00e4 n\u00e4kyy selv\u00e4sti monia kosmisten s\u00e4teiden ja muiden ilmi\u00f6iden aiheuttamia naarmuja ja raitoja.<\/p>\n

Kun video kuvattiin 26. hein\u00e4kuuta 2021, Itokawa sijaitsi Skorpionin t\u00e4hdist\u00f6ss\u00e4. Asteroidi ja Maa olivat tuolloin l\u00e4himmill\u00e4\u00e4n toisistaan, noin 42 miljoonan kilometrin p\u00e4\u00e4ss\u00e4 toisistaan. (Vertailun vuoksi: Maa on 150 miljoonan kilometrin p\u00e4\u00e4ss\u00e4 Auringosta.)<\/p>\n

Tarkista vastauksesi<\/p>","protected":false},"excerpt":{"rendered":"

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 […]<\/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\/fi\/wp-json\/wp\/v2\/posts\/186","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=186"}],"version-history":[{"count":2,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/186\/revisions"}],"predecessor-version":[{"id":3942,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/186\/revisions\/3942"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=186"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=186"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=186"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=186"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=186"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=186"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=186"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=186"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=186"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=186"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}