{"id":147,"date":"2013-11-15T09:56:23","date_gmt":"2013-11-15T09:56:23","guid":{"rendered":"http:\/\/www.123fakta.com\/da\/?p=147"},"modified":"2026-03-19T10:39:05","modified_gmt":"2026-03-19T10:39:05","slug":"faktoja-kaapioplaneetoista","status":"publish","type":"post","link":"https:\/\/www.123fakta.com\/fi\/facts-about-dwarf-planets","title":{"rendered":"Tietoa k\u00e4\u00e4pi\u00f6planeetoista"},"content":{"rendered":"<ol>\n<li><strong>Pluto:<\/strong>\u00a0Pluto on aurinkokuntamme suurin ja tunnetuin k\u00e4\u00e4pi\u00f6planeetta. Ensimm\u00e4iset viisi tunnustettua k\u00e4\u00e4pi\u00f6planeettaa ovat Ceres, Pluto, Eris, Makemake ja Haumea.<\/li>\n<li><strong>L\u00e4pimenoaika:<\/strong>\u00a0Muiden planeettojen tavoin k\u00e4\u00e4pi\u00f6planeettojen kiertoaika vaihtelee - sek\u00e4 itsens\u00e4 ett\u00e4 Auringon ymp\u00e4ri. T\u00e4m\u00e4 tarkoittaa, ett\u00e4 aikayksik\u00f6ill\u00e4, kuten p\u00e4ivill\u00e4 ja vuosilla, on eri arvot kuin maapallolla. Esimerkiksi yksi vuosi Plutolla on t\u00e4\u00e4ll\u00e4 Maassa noin 248 vuotta. 1 vuosi Cereksell\u00e4 on noin 4,6 vuotta t\u00e4\u00e4ll\u00e4 Maassa.<\/li>\n<li><strong>Kuiperin vy\u00f6:<\/strong>\u00a0L\u00e4hes kaikki aurinkokuntamme k\u00e4\u00e4pi\u00f6planeetat sijaitsevat Kuiperin vy\u00f6hykkeell\u00e4 (mukaan lukien Pluto). Ainoa Kuiperin vy\u00f6n ulkopuolinen k\u00e4\u00e4pi\u00f6planeetta on Ceres, joka sijaitsee Marsin ja Jupiterin v\u00e4lisell\u00e4 asteroidivy\u00f6hykkeell\u00e4.<\/li>\n<li><strong>Rakenne:<\/strong>\u00a0K\u00e4\u00e4pi\u00f6planeetat koostuvat p\u00e4\u00e4asiassa kivest\u00e4 ja\/tai j\u00e4\u00e4st\u00e4. Kiven ja j\u00e4\u00e4n suhde riippuu kunkin k\u00e4\u00e4pi\u00f6planeetan sijainnista aurinkokunnassa.<\/li>\n<li><strong>Liv:<\/strong>\u00a0Yksik\u00e4\u00e4n tunnetuista k\u00e4\u00e4pi\u00f6planeetoista ei voi yll\u00e4pit\u00e4\u00e4 el\u00e4m\u00e4\u00e4 (ainakaan sellaisia el\u00e4m\u00e4nmuotoja, joista tied\u00e4mme).<\/li>\n<li><strong>Tunnelma:<\/strong>\u00a0K\u00e4\u00e4pi\u00f6planeetoilla Plutolla ja Eriksell\u00e4 on ohut ilmakeh\u00e4, joka laajenee, kun ne l\u00e4hestyv\u00e4t aurinkoa, ja romahtaa (tai j\u00e4\u00e4tyy), kun ne et\u00e4\u00e4ntyv\u00e4t auringosta.<\/li>\n<li><strong>Sormukset:<\/strong>\u00a0Yhdell\u00e4k\u00e4\u00e4n tunnetuista k\u00e4\u00e4pi\u00f6planeetoista ei ole renkaita.<\/li>\n<li><strong>Kuut:<\/strong>\u00a0Monilla mutta ei kaikilla k\u00e4\u00e4pi\u00f6planeetoilla on kuita. Esimerkiksi Cereksell\u00e4 ei ole kuita, kun taas Plutolla on 5 kuuta.<\/li>\n<li><strong>Dawn:<\/strong>\u00a0Ensimm\u00e4inen k\u00e4\u00e4pi\u00f6planeetalle suuntautuva tutkimusmatka on Dawn-luotain, joka laukaistiin 27. syyskuuta 2007. Sen tavoitteena on kiert\u00e4\u00e4 Ceres helmikuussa 2015. Vuonna 2011 Dawn vieraili my\u00f6s protoplaneetta Vestalla ja kiersi sen kiertoradalla. Jos teht\u00e4v\u00e4 onnistuu, Dawn on ensimm\u00e4inen avaruusalus, joka kiert\u00e4\u00e4 2 avaruuskappaletta.<\/li>\n<li><strong>Uudet horisontit:<\/strong>\u00a0Ensimm\u00e4inen Kuiperin vy\u00f6hykkeelle - jossa Pluto ja useimmat muut k\u00e4\u00e4pi\u00f6planeetat sijaitsevat - suuntautuva avaruuslento New Horizons k\u00e4ynnistettiin vuonna 2006, ja sen on m\u00e4\u00e4r\u00e4 saapua sinne vuonna 2015.<\/li>\n<\/ol>\n<figure id=\"attachment_7920\" aria-describedby=\"caption-attachment-7920\" style=\"width: 790px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-7920\" src=\"https:\/\/www.123fakta.com\/wp-content\/uploads\/dvaergplanet-fakta-2.jpg\" alt=\"Fakta: Ceres on ainoa k\u00e4\u00e4pi\u00f6planeetta sis\u00e4isess\u00e4 aurinkokunnassa.\" width=\"800\" height=\"800\" srcset=\"https:\/\/www.123fakta.com\/wp-content\/uploads\/dvaergplanet-fakta-2.jpg 800w, https:\/\/www.123fakta.com\/wp-content\/uploads\/dvaergplanet-fakta-2-300x300.jpg 300w, https:\/\/www.123fakta.com\/wp-content\/uploads\/dvaergplanet-fakta-2-150x150.jpg 150w, https:\/\/www.123fakta.com\/wp-content\/uploads\/dvaergplanet-fakta-2-768x768.jpg 768w, https:\/\/www.123fakta.com\/wp-content\/uploads\/dvaergplanet-fakta-2-12x12.jpg 12w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-7920\" class=\"wp-caption-text\">Attribuutio: Wikipedia.org<\/figcaption><\/figure>\n<p style=\"text-align: center;\"><em><strong>Fakta: Ceres on aurinkokuntamme ainoa k\u00e4\u00e4pi\u00f6planeetta, joka on Kuiperin vy\u00f6n ulkopuolella - aurinkokunnan sis\u00e4osassa. Hubble-teleskoopin vuonna 2005 ottama kuva.<\/strong><\/em><\/p>\n<h2>K\u00e4\u00e4pi\u00f6planeetan m\u00e4\u00e4ritelm\u00e4<\/h2>\n<p>Ennen vuotta 2006 Plutoa pidettiin \"tavallisena\" planeettana aurinkokuntamme kahdeksan muun planeetan rinnalla. Kuiperin vy\u00f6hykkeelt\u00e4 l\u00f6ydetty Pluton kokoinen planeetta her\u00e4tti kuitenkin keskustelua planeetan ja k\u00e4\u00e4pi\u00f6planeetan todellisesta m\u00e4\u00e4ritelm\u00e4st\u00e4. Tuloksena syntyi uusi virallinen m\u00e4\u00e4ritelm\u00e4 k\u00e4\u00e4pi\u00f6planeetoille, joka on ollut voimassa 24. elokuuta 2006 l\u00e4htien.<\/p>\n<p>K\u00e4\u00e4pi\u00f6planeetat m\u00e4\u00e4ritell\u00e4\u00e4n taivaankappaleiksi, jotka:<\/p>\n<ul>\n<li>Auringon kiertoradalla<\/li>\n<li>Sen massa riitt\u00e4\u00e4 (l\u00e4hes) py\u00f6re\u00e4n muodon omaksumiseen.<\/li>\n<li>ei ole tyhjent\u00e4nyt kiertorataansa aineesta (toisin kuin \"oikea\" planeetta).<\/li>\n<li>Ei kuuta<\/li>\n<\/ul>\n<p>T\u00e4rkein asia, joka erottaa k\u00e4\u00e4pi\u00f6planeetat kasveista, on kuitenkin kohta 3: planeetat ovat tyhjent\u00e4neet Auringon kiertoratansa aineesta, kun taas k\u00e4\u00e4pi\u00f6planeetat kiert\u00e4v\u00e4t yleens\u00e4 alueilla, joilla samankaltaiset kohteet voivat ylitt\u00e4\u00e4 Auringon kiertoratansa (erityisesti Kuiperin vy\u00f6n kaltaiset asteroidivy\u00f6hykkeet). Toinen hyv\u00e4 nyrkkis\u00e4\u00e4nt\u00f6 on, ett\u00e4 k\u00e4\u00e4pi\u00f6planeetat ovat yleens\u00e4 pienempi\u00e4 kuin Merkurius.<\/p>\n<p>Viralliset m\u00e4\u00e4ritelm\u00e4t ja s\u00e4\u00e4nn\u00f6t planeettojen ja k\u00e4\u00e4pi\u00f6planeettojen erottamiseksi toisistaan on annettu\u00a0<a href=\"http:\/\/www.iau.org\/\" rel=\"noopener noreferrer\">Kansainv\u00e4linen t\u00e4htitieteellinen liitto<\/a>.<\/p>\n<h3>Plutoidit<\/h3>\n<p>Kun Pluto kuitenkin luokiteltiin vuonna 2006 planeetasta k\u00e4\u00e4pi\u00f6planeetaksi, Kansainv\u00e4linen t\u00e4htitieteellinen liitto tunnusti Pluton erityisaseman aurinkokunnassa ja otti k\u00e4ytt\u00f6\u00f6n yhteisnimityksen \"plutoidit\" kaikille k\u00e4\u00e4pi\u00f6planeetoille, jotka ovat Neptunusta kauempana auringosta.<\/p>","protected":false},"excerpt":{"rendered":"<p>Pluto: Pluto on aurinkokuntamme suurin ja tunnetuin k\u00e4\u00e4pi\u00f6planeetta. Ensimm\u00e4iset viisi tunnustettua k\u00e4\u00e4pi\u00f6planeettaa ovat Ceres, Pluto, Eris, Makemake ja Haumea: Muiden planeettojen tavoin k\u00e4\u00e4pi\u00f6planeettojen kiertoaika vaihtelee - sek\u00e4 itsens\u00e4 ett\u00e4 Auringon ymp\u00e4ri. T\u00e4m\u00e4 tarkoittaa, ett\u00e4 aikayksik\u00f6t, kuten p\u00e4iv\u00e4t ja vuodet ... <a title=\"Tietoa k\u00e4\u00e4pi\u00f6planeetoista\" class=\"read-more\" href=\"https:\/\/www.123fakta.com\/fi\/facts-about-dwarf-planets\" aria-label=\"Lue lis\u00e4\u00e4 aiheesta Faktoja k\u00e4\u00e4pi\u00f6planeetoista\">Lue lis\u00e4\u00e4<\/a><\/p>","protected":false},"author":1,"featured_media":7919,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"cybocfi_hide_featured_image":"","footnotes":""},"categories":[69],"tags":[120],"class_list":["post-147","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-the-universe","tag-adsense"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Dwarf planets - What is a dwarf planet?<\/title>\n<meta name=\"description\" content=\"Dwarf planets are generally smaller than Mercury and are primarily found in the Kuiper belt. 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