{"id":1526,"date":"2016-01-21T10:38:14","date_gmt":"2016-01-21T08:38:14","guid":{"rendered":"http:\/\/www.astrobobo.net\/?p=1526"},"modified":"2023-07-12T08:48:17","modified_gmt":"2023-07-12T06:48:17","slug":"je-li-zaista-otkriven-deveti-planet","status":"publish","type":"post","link":"http:\/\/www.astrobobo.net\/?p=1526","title":{"rendered":"Je li zaista otkriven deveti planet?"},"content":{"rendered":"<p>Ukratko &#8211; nije. Za sad je to hipoteza koju treba potvrditi, iako su ra\u010dunalne simulacije prili\u010dno uvjerljive. No krenimo redom.<\/p>\n<p>Za po\u010detak pogledajte kratak video koji su napravili u \u010dasopisu Science, a gdje se lijepo vidi koliko je zapravo udaljen potencijalni planet od ostalih planeta Sun\u010devog sustava:<\/p>\n<p><iframe title=\"A new 9th planet for the solar system?\" width=\"1240\" height=\"698\" src=\"https:\/\/www.youtube.com\/embed\/42GeoCVaZQg?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Hipoteza o nepoznatom planetu nije novost. Jo\u0161 od otkri\u0107a <a href=\"https:\/\/en.wikipedia.org\/wiki\/90377_Sedna\" target=\"_blank\" rel=\"noopener\">patuljastog planeta Sedne<\/a> vidjelo se da Sedna ima vrlo neobi\u010dnu orbitu. Tako veliki objekt (1000 km promjera) je mogao nastati samo u kru\u017enoj orbiti iz koje ju je izbacilo neko drugo tijelo &#8211; mo\u017eda bliski susret sa nekom zvijezdom ili jo\u0161 neotkriveni planetarni objekt u vanjskom dijelu Sun\u010devog sustava.<\/p>\n<p>No, nakon Sedne otkriveno je jo\u0161 nekoliko objekata (u znanstvenom radu ih se spominje jo\u0161 5) koji imaju vrlo sli\u010dnu putanju &#8211; elipti\u010dnu i nagnutu u odnosu na ekliptiku. <a href=\"http:\/\/iopscience.iop.org\/article\/10.3847\/0004-6256\/151\/2\/22\" target=\"_blank\" rel=\"noopener\">Astronomi Batigyn i Brown<\/a> (Brown je jedan od otkriva\u010da Sedne) krenuli su analizirati te putanje i na osnovi mnogih dugotrajnih ra\u010dunalnih simulacija zaklju\u010dili da je tih \u0161est objekata moglo do\u0107i na sada\u0161nje putanje samo ako ih je tamo &#8220;pogurao&#8221; do sada nepoznat planetarni objekt.<\/p>\n<p>Dvojica astronoma sami obja\u0161njavaju kako su do\u0161li do tog zaklju\u010dka u ovom vrlo zanimljivom videu u kojem jo\u0161 bolje mo\u017eete vidjeti putanje Sedne i ekipe te hipotetskog planeta:<\/p>\n<p><iframe title=\"Evidence of a Ninth Planet\" width=\"1240\" height=\"698\" src=\"https:\/\/www.youtube.com\/embed\/6poHQ2h00ZA?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Prora\u010duni, iako drugotrajni i komplicirani, dali su tek grube okvire putanje i dimenzije tog planeta. Taj objekt bi trebao imati masu 1-10x ve\u0107u od Zemlje sa vrlo elipti\u010dnom orbitom kojoj je perihel na cca 200-300 AJ, a afel 600 &#8211; 1200 AJ. Jednu orbitu bi hipotetski planet napravio za 10 &#8211; 20 <i>tisu\u0107a<\/i> godina. Za usporedbu, <a href=\"https:\/\/en.wikipedia.org\/wiki\/Neptune\" target=\"_blank\" rel=\"noopener\">Neptun<\/a> se kre\u0107e oko Sunca na udaljenosti od 30 AJ. <a href=\"https:\/\/en.wikipedia.org\/wiki\/90377_Sedna\" target=\"_blank\" rel=\"noopener\">Sedna<\/a> ima perihel na 76 AJ, afel na 936 AJ i orbitalni period od 11 400 godina.<\/p>\n<p>To je daleko od <a href=\"https:\/\/en.wikipedia.org\/wiki\/Discovery_of_Neptune\" target=\"_blank\" rel=\"noopener\">preciznosti na\u010dina na koji je otkriven Neptun<\/a>. Nakon \u0161to su precizna mjerenja Urana pokazala da na njegovu putanju utje\u010de tada nepoznato nebesko tijelo velike mase, Le Verrier je prora\u010dunao gdje bi se to tijelo moglo nalaziti. I zaista, unutar samo 1\u00b0 od izra\u010dunatih koordinata (2x prividne veli\u010dine Mjeseca na na\u0161em nebu) otkriven je novi planet &#8211; Neptun.<\/p>\n<figure id=\"attachment_1531\" aria-describedby=\"caption-attachment-1531\" style=\"width: 720px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2016\/01\/Planet-Nine-orbital-plot.jpg\" rel=\"attachment wp-att-1531\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-1531 size-full\" src=\"http:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2016\/01\/Planet-Nine-orbital-plot.jpg\" alt=\"Planet-Nine-orbital-plot\" width=\"720\" height=\"411\" srcset=\"http:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2016\/01\/Planet-Nine-orbital-plot.jpg 720w, http:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2016\/01\/Planet-Nine-orbital-plot-300x171.jpg 300w, http:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2016\/01\/Planet-Nine-orbital-plot-526x300.jpg 526w, http:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2016\/01\/Planet-Nine-orbital-plot-500x285.jpg 500w\" sizes=\"(max-width: 720px) 100vw, 720px\" \/><\/a><figcaption id=\"caption-attachment-1531\" class=\"wp-caption-text\">Orbita hipotetskog devetog planeta sa Sednom i jo\u0161 5 manjih objekata. Sun\u010dev sustav zajedno sa orbitom Neptuna prikazani su u sredini unutar \u017eutog kruga.<\/figcaption><\/figure>\n<p>I sami autori u svom radu navode da je planet jo\u0161 uvijek hipoteza dok se ne otkrije pomo\u0107u teleskopa. Njegova velika udaljenost zna\u010di da je <em>vrlo slabog sjaja<\/em> te \u0107e biti potrebno koristiti najve\u0107e teleskope na svijetu za njegovo otkrivanje. Tako\u0111er je odzvoljena mogu\u0107nost postojanja drugih objekata sa neobi\u010dnim putanjama, ali koje se razlikuju od Sedne i ekipe. Otkri\u0107e jednog od njih dodatno bi u\u010dvrstilo hipotezu o postojanju planeta.<\/p>\n<p>Tako\u0111er da upozorim katastrofi\u010dare &#8211; ovaj planet se <i>nije pojavio odjednom!<\/i> Da bi se uspostavile ovakve orbite potrebni su milijuni godina i sada su te orbite stabilne. U <a href=\"http:\/\/www.caltech.edu\/news\/caltech-researchers-find-evidence-real-ninth-planet-49523\" target=\"_blank\" rel=\"noopener\">ovome \u010dlanku Brown ka\u017ee<\/a> da je taj planet (ako postoji!) najvjerojatnije izba\u010den u udaljenu orbitu tijekom formiranja Sun\u010devog sustava zbog susreta sa drugim plinovitim divovima (Jupiter, Saturn). Dakle, situacija je rije\u0161ena i stabilna vi\u0161e stotina milijuna godina. Osim toga, u <a href=\"http:\/\/iopscience.iop.org\/article\/10.3847\/0004-6256\/151\/2\/22#aj522495s5\">tekstu njihovog znansvtenog rada<\/a> mo\u017eete pro\u010ditati da su kompjuterske simulacije ra\u0111ene za <em>razdoblja od 4 milijarde godina <\/em>(4 Gyr).<\/p>\n<p>Dok se ne napravi stvarno otkri\u0107e pomo\u0107u teleskopa, planet je za sada jo\u0161 uvijek samo hipoteza. Za njegovo otkri\u0107e trebati \u0107e upregnuti velike teleskope, \u0161to zna\u010di da \u0107emo \u010dekati barem 5 &#8211; 10 godina za nekakve rezultate.<\/p>\n<p>Detaljnije o potencijalnom devetom planetu pro\u010ditajte na respektabilnim astronomskim i znanstvenim web portalima. Nastojte ignorirati doma\u0107e senzacionalisti\u010dke \u010dlanke koje ne daju potpune informacije!<\/p>\n<ul>\n<li><a href=\"http:\/\/www.sciencemag.org\/news\/2016\/01\/feature-astronomers-say-neptune-sized-planet-lurks-unseen-solar-system?utm_source=newsfromscience&amp;utm_medium=facebook-text&amp;utm_campaign=planetx-1988\" target=\"_blank\" rel=\"noopener\">Science Magazine<\/a><\/li>\n<li><a href=\"http:\/\/www.skyandtelescope.com\/astronomy-news\/making-the-case-for-planet-nine-012020167\/\" target=\"_blank\" rel=\"noopener\">Sky and Telescope<\/a><\/li>\n<li><a href=\"http:\/\/www.caltech.edu\/news\/caltech-researchers-find-evidence-real-ninth-planet-49523\" target=\"_blank\" rel=\"noopener\">Caltech<\/a><\/li>\n<li><a href=\"http:\/\/phys.org\/news\/2016-01-evidence-real-ninth-planet.html\" target=\"_blank\" rel=\"noopener\">Phys.org<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Ukratko &#8211; nije. Za sad je to hipoteza koju treba potvrditi, iako su ra\u010dunalne simulacije prili\u010dno uvjerljive. No krenimo redom. Za po\u010detak pogledajte kratak video koji su napravili u \u010dasopisu Science, a gdje se lijepo vidi koliko je zapravo udaljen potencijalni planet od ostalih planeta Sun\u010devog sustava: Hipoteza o nepoznatom planetu nije novost. Jo\u0161 od [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1531,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"gallery","meta":{"_acf_changed":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[121],"tags":[71,102,103],"class_list":["post-1526","post","type-post","status-publish","format-gallery","has-post-thumbnail","hentry","category-svemirske-zanimljivosti","tag-astronomija","tag-deveti-planet","tag-otkrice","post_format-post-format-gallery"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Ukratko - nije. Za sad je to hipoteza koju treba potvrditi, iako su ra\u010dunalne simulacije prili\u010dno uvjerljive. 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