{"id":915,"date":"2008-07-11T09:58:00","date_gmt":"2008-07-11T07:58:00","guid":{"rendered":"https:\/\/kids.esa.int\/soho_discovers_thousands_of_comets\/"},"modified":"2026-10-08T00:33:43","modified_gmt":"2026-10-07T22:33:43","slug":"soho_discovers_thousands_of_comets","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/soho_discovers_thousands_of_comets\/","title":{"rendered":"SOHO l\u00f6yt\u00e4\u00e4 tuhansia komeettoja"},"content":{"rendered":"<div class=\"lede\">\n<p>Toimintansa aloittamisesta vuonna 1996 l\u00e4htien ESA:n ja NASA:n SOHO-avaruusluotain on tarkkaillut taukoamatta valtavaa, kuumaa Aurinkoa. Yht\u00e4 sen mittalaitteista, LASCOa, k\u00e4ytet\u00e4\u00e4n Auringon ulkoisen ilmakeh\u00e4n (koronan) havainnointiin. Tarkkasilm\u00e4inen LASCO-kamera on kuitenkin osoittanut my\u00f6s upean kyvyn l\u00f6yt\u00e4\u00e4 pieni\u00e4 likaisia j\u00e4\u00e4palasia, joita kutsumme komeetoiksi. Syyskuuhun 2010 menness\u00e4 SOHO oli l\u00f6yt\u00e4nyt yli 1 900 komeettaa, mik\u00e4 on enemm\u00e4n kuin kaikki muut komeettojen l\u00f6yt\u00e4j\u00e4t yhteens\u00e4. Ei lainkaan huono saavutus avaruusalukselta, joka suunniteltiin tutkimaan l\u00e4hint\u00e4 t\u00e4htemme.<\/p>\n<\/div>\n<p>Komeetat ovat j\u00e4\u00e4- ja p\u00f6lypalasia \u2013 \u2018j\u00e4\u00e4mi\u00e4\u2019 planeettojen muodostumisesta 4,5 miljardia vuotta sitten. Kaikki komeetat kiert\u00e4v\u00e4t Aurinkoa, ja monet niist\u00e4 ovat aurinkoa hipovia komeettoja, jotka kulkevat hyvin l\u00e4hell\u00e4 sen polttavaa pintaa. Jotkut Aurinkoa kiert\u00e4vist\u00e4 komeetoista n\u00e4kyv\u00e4t SOHO:n kuvissa pienin\u00e4 pistein\u00e4 tai viivoina \u2013 vaikka kaikki eiv\u00e4t selvi\u00e4k\u00e4\u00e4n tulikuumasta ohituksesta. Monet niist\u00e4 h\u00f6yrystyv\u00e4t tai sy\u00f6ksyv\u00e4t t\u00e4hteen.<\/p>\n<p>Noin 85% SOHO:n l\u00f6yt\u00e4mist\u00e4 kappaleista on j\u00e4\u00e4nteit\u00e4 aikoinaan mahtavasta komeetasta, joka hajosi sy\u00f6ksyess\u00e4\u00e4n kohti Aurinkoa, luultavasti monta vuosisataa sitten.<\/p>\n<figure class=\"wp-block-image size-natural\" data-width=\"400\" data-credit=\"ESA\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/11\/Artist_s_impression_of_SOHO_spacecraft2\" 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\/2003\/11\/artist_s_impression_of_soho_spacecraft2\/17874814-2-eng-GB\/Artist_s_impression_of_SOHO_spacecraft.jpg\" alt=\"Artist&#x27;s impression of SOHO spacecraft\"><figcaption>Taiteilijan n\u00e4kemys SOHO-avaruusaluksesta<\/figcaption><\/figure>\n<p>Komeettojen havainnoinnissa SOHO:lla on yksi suuri etu muihin verrattuna: sen sijainti Auringon ja Maan v\u00e4liss\u00e4. Peitt\u00e4m\u00e4ll\u00e4 Auringon h\u00e4ik\u00e4isyn LASCO pystyy havaitsemaan alueita, jotka muuten olisivat n\u00e4kyviss\u00e4 vain t\u00e4ydellisen auringonpimennyksen aikana.<\/p>\n<p>Tietenk\u00e4\u00e4n LASCO ei itse tee havaintoja. Teht\u00e4v\u00e4 kuuluu ryhm\u00e4lle eritt\u00e4in osaavia vapaaehtoisia, jotka tarkastelevat kuvia heti niiden lataamisen j\u00e4lkeen. Kun SOHO on l\u00e4hett\u00e4nyt kuvat Maahan, ne voivat olla Internetiss\u00e4 ja valmiina analysoitaviksi jo 15 minuuttia ottamisen j\u00e4lkeen.<\/p>","protected":false},"excerpt":{"rendered":"<p>Since beginning operations in 1996, the ESA\/NASA SOHO spacecraft has spent its time staring non-stop at the enormous, sizzling Sun. One of its instruments, called LASCO, is used to observe [&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\/06\/soho_s_record-breaking_discovery2\/17871744-2-eng-GB\/SOHO_s_record-breaking_discovery.jpg","esa_banner_description":"SOHO's record-breaking discovery","esa_banner_credit":"ESA\/ NASA\/ SOHO","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2008\/06\/SOHO_s_record-breaking_discovery2","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-915","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\/915","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=915"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/915\/revisions"}],"predecessor-version":[{"id":4737,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/915\/revisions\/4737"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=915"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=915"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=915"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=915"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=915"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=915"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=915"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=915"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=915"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=915"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}