{"id":1076,"date":"2009-12-21T13:17:00","date_gmt":"2009-12-21T12:17:00","guid":{"rendered":"https:\/\/kids.esa.int\/rosetta_comes_home_for_final_earth_flyby\/"},"modified":"2026-10-08T00:35:41","modified_gmt":"2026-10-07T22:35:41","slug":"rosetta_comes_home_for_final_earth_flyby","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/rosetta_comes_home_for_final_earth_flyby\/","title":{"rendered":"Rosetta palaa kotiin viimeist\u00e4 Maan ohilentoa varten"},"content":{"rendered":"<div class=\"lede\">\n<p>5\u00bd vuotta Ranskan Guayanasta tapahtuneen laukaisun j\u00e4lkeen ESA:n Rosetta-komeettatutkimusluotain on palannut kotiin lyhyelle vierailulle. 13. marraskuuta aamulla Darmstadtissa, Saksassa sijaitsevan avaruusoperaatiokeskuksen lennonjohtajat vahvistivat, ett\u00e4 Rosetta oli suorittanut onnistuneesti viimeisen ohilentonsa Maan ohi.<\/p>\n<\/div>\n<p>Avaruusluotain liikkui 13,34 km\/s:n nopeudella ja ohitti planeetan 2 481 km:n korkeudella. L\u00e4hin kohtaaminen tapahtui klo 08:45:40 CET, aivan Indonesian Jaavan saaren etel\u00e4puolella. T\u00e4m\u00e4 nelj\u00e4s kohtaaminen planeetan kanssa antoi 3 tonnin painoiselle luotaimelle riitt\u00e4v\u00e4sti energiaa ylitt\u00e4\u00e4 asteroidivy\u00f6hykkeen ja saavuttaa komeetta Churyumov-Gerasimenko.<\/p>\n<figure class=\"wp-block-image size-natural\" data-width=\"400\" data-credit=\"ESA (Animation by M. Graf)\" data-detail-url=\"https:\/\/www.esa.int\/Media\/Animations\/Rosetta_v31_Embrgo_untill_13Nov2009\" 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\/media\/animations\/rosetta_v31_embrgo_untill_13nov2009\/6692-5-eng-GB\/Rosetta_v31_Embrgo_untill_13Nov2009.jpg\" alt=\"\"><\/figure>\n<p>Rosetta saattaa my\u00f6s auttaa ratkaisemaan pitk\u00e4\u00e4n ratkaisematta olleen mysteerin. Vuosien varrella joissakin avaruusaluksissa (mukaan lukien Rosetta) on havaittu pieni \u2013 mutta odottamaton \u2013 nopeuden muutos niiden ohittaessa Maan. Toistaiseksi kukaan ei ole keksinyt t\u00e4h\u00e4n hyv\u00e4\u00e4 selityst\u00e4.<\/p>\n<p>Tutkijat hy\u00f6dynsiv\u00e4t ohilentoa k\u00e4ynnist\u00e4\u00e4kseen joitakin Rosettan mittalaitteita. Ensimm\u00e4isiss\u00e4 kuvissa n\u00e4kyi kapea puolikuu, jonka koko kasvoi v\u00e4hitellen, kun avaruusluotain kiihdytti kohti Maata. My\u00f6hemmiss\u00e4 kuvissa n\u00e4kyi y\u00f6ll\u00e4 loistavat kaupunkivalot sek\u00e4 py\u00f6rteiset pilvet Pohjois-Amerikan ja Tyynenmeren yll\u00e4. Muilla laitteilla tutkittiin planeetan ilmakeh\u00e4\u00e4 ja magneettikentt\u00e4\u00e4 sek\u00e4 etsittiin vett\u00e4 Kuusta.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"1355\" data-credit=\"ESA \u00a92009 MPS for OSIRIS Team MPS\/UPD\/LAM\/IAA\/RSSD\/INTA\/UPM\/DASP\/IDA\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2009\/11\/First_view_as_Rosetta_approaches_home2\" 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\/2009\/11\/first_view_as_rosetta_approaches_home2\/17902197-2-eng-GB\/First_view_as_Rosetta_approaches_home.png\" alt=\"First view as Rosetta approaches home\"><figcaption>Ensimm\u00e4inen n\u00e4kym\u00e4 Rosettan l\u00e4hestyess\u00e4 kotia<\/figcaption><\/figure>\n<p>Rosetta on nyt kulkenut noin 4 500 miljoonaa kilometri\u00e4 7 100 miljoonan kilometrin matkastaan kohti komeettaa. Viimeinen ohilento Maan ohi lis\u00e4si Rosettan nopeutta 3,6 km\/s ja ohjasi avaruusaluksen kohti aurinkokunnan ulko-osia. Seuraava kohde sen 10-vuotisella matkalla on ohilento suuren Lutetia-nimisen asteroidin ohi hein\u00e4kuussa 2010. Sen j\u00e4lkeen Rosetta siirtyy lepotilaan, kunnes se her\u00e4tet\u00e4\u00e4n kev\u00e4\u00e4ll\u00e4 2014.<\/p>","protected":false},"excerpt":{"rendered":"<p>5\u00bd years after lift off from French Guiana, ESA\u2019s Rosetta comet chaser has returned home for a brief, flying visit. On the morning of 13 November, controllers at the Space [&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\/08\/rosetta_spacecraft5\/17879662-2-eng-GB\/Rosetta_spacecraft.jpg","esa_banner_description":"Rosetta spacecraft","esa_banner_credit":"ESA - J. Huart","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2008\/08\/Rosetta_spacecraft5","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-1076","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\/1076","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=1076"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1076\/revisions"}],"predecessor-version":[{"id":4835,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1076\/revisions\/4835"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=1076"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=1076"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=1076"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=1076"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=1076"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=1076"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=1076"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=1076"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=1076"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=1076"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}