ISON (C\/2012 S1) kuyrukluy\u0131ld\u0131z\u0131n\u0131 21 Eyl\u00fcl 2012 tarihinde ke\u015ffettik. Ke\u015ffetti\u011fimizde bizden 940 milyon kilometre uzakl\u0131ktayd\u0131. Bahsi ge\u00e7en bu kuyrukluy\u0131ld\u0131z \u00e7ok ilgin\u00e7 bir g\u00f6kcismi \u00e7\u00fcnk\u00fc g\u00fcne\u015f sisteminin olu\u015fumundan bu yana bozulmadan kalabilen tek kuyruklu y\u0131ld\u0131z ve olu\u015ftu\u011fu ilk g\u00fcnden bu yana sistemin \u00fcst k\u0131s\u0131mlar\u0131nda dolan\u0131rken ilk defa sistemin i\u00e7 k\u0131s\u0131mlar\u0131na do\u011fru harekete ge\u00e7ti. \u015eu anda ise Oort bulutundan G\u00fcne\u015f\u2019e do\u011fru yolculu\u011fu s\u00fcr\u00fcyor.<\/p>\n
ISON, Rusya Kislovodsk\u2019deki Uluslararas\u0131 Bilimsel Optik A\u011f Merkezi\u2019ndeki g\u00f6kbilimciler Vitali Nevski ve Artyom Novichonok taraf\u0131ndan ke\u015ffedildi. Kuyrukluy\u0131ld\u0131z\u0131n 2013 yaz\u0131n\u0131n sonuna do\u011fru G\u00fcne\u015f\u2019e 1,2 milyon kilometre yakla\u015farak Ven\u00fcs\u2019\u00fcn parlakl\u0131\u011f\u0131n\u0131n alt\u0131 kat\u0131na eri\u015fece\u011fi tahmin ediliyordu. Kas\u0131m ay\u0131nda G\u00fcne\u015f\u2019ten gelen \u00e7ekim g\u00fcc\u00fcne dayanabilir ve hayatta kalabilir ise Aral\u0131k ay\u0131nda kuzey yar\u0131m k\u00fcrede devasa bir parlakl\u0131\u011fa eri\u015fecek ve hatta \u00e7\u0131plak g\u00f6z ile g\u00f6zlemlenebilecekti. Ancak ters giden bir \u015feyler var.<\/p>\n
NASA\u2019n\u0131n Spitzer Uzay Teleskopu kuyrukluy\u0131ld\u0131z \u00fczerinde g\u00fc\u00e7l\u00fc karbondioksit \u00e7\u0131k\u0131\u015flar\u0131 g\u00f6zlemledi. Spitzer\u2019in K\u0131z\u0131l\u00f6tesi Kamera Dizisi ile al\u0131nan g\u00f6r\u00fcnt\u00fclerde ortalama 300.000 kilometre uzunlu\u011fa sahip kuyruktaki tozun karbondioksit kar\u0131\u015f\u0131m\u0131 oldu\u011fu ve resmen k\u00f6p\u00fcrd\u00fc\u011f\u00fc g\u00f6zlemlendi.<\/p>\n
Kuyrukluy\u0131ld\u0131zlar donmu\u015f su, gaz ve kozmik toz kar\u0131\u015f\u0131m\u0131ndan meydana gelmi\u015f cisimlerdir. Sand\u0131\u011f\u0131m\u0131z gibi birer y\u0131ld\u0131z de\u011fillerdir; \u0131\u015f\u0131k \u00fcretemez, \u00fczerine d\u00fc\u015fen \u0131\u015f\u0131\u011f\u0131 yans\u0131t\u0131rlar. G\u00fcne\u015f sisteminin d\u0131\u015f\u0131nda hiperbolik bir y\u00f6r\u00fcnge izleyen kuyruklu y\u0131ld\u0131zlar\u0131 sadece G\u00fcne\u015f\u2019e yakla\u015ft\u0131klar\u0131 s\u0131rada g\u00f6zlemleyebiliriz.<\/p>\n
ISON \u00fczerinde yap\u0131lan son \u00f6l\u00e7\u00fcmlerde kuyrukluy\u0131ld\u0131z\u0131n parlakl\u0131\u011f\u0131 Ocak ay\u0131ndan itibaren yava\u015fl\u0131yor. Ve \u015fu anda 18,9 kadir sabit parlakl\u0131\u011f\u0131 ile yolculu\u011funa devam eden ISON g\u00f6kbilimcileri \u015fa\u015f\u0131rtm\u0131\u015f durumda, \u00e7\u00fcnk\u00fc kuyrukluy\u0131ld\u0131z\u0131n giderek parlakl\u0131\u011f\u0131n\u0131n artmas\u0131 gerekirken sergiledi\u011fi bu tav\u0131r olduk\u00e7a anormal bir durum.<\/p>\n
Kolombiya Amerikan \u00dcniversitesi\u2019nde g\u00f6rev yapan Astronomi ve Uzay Bilimleri uzman\u0131 \u0130gnoco Ferrin yapt\u0131\u011f\u0131 bas\u0131n a\u00e7\u0131klamas\u0131nda uzun s\u00fcredir g\u00f6kbilimciler taraf\u0131ndan beklenen kuyrukluy\u0131ld\u0131z\u0131n d\u00fc\u015f\u00fcn\u00fclen parlakl\u0131\u011fa ula\u015fmayaca\u011f\u0131n\u0131 a\u00e7\u0131klad\u0131. Kuyrukluy\u0131ld\u0131z\u0131n \u00e7ap\u0131 4,8 kilometre, a\u011f\u0131rl\u0131\u011f\u0131n\u0131n ise 3,2 milyon ya da trilyon oldu\u011fu d\u00fc\u015f\u00fcn\u00fcl\u00fcyor. G\u00f6kbilimcilere g\u00f6re ISON G\u00fcne\u015f sisteminin ilk temel yap\u0131ta\u015flar\u0131n\u0131 bar\u0131nd\u0131r\u0131yor. Ancak kuyrukluy\u0131ld\u0131za ne oldu\u011fu h\u00e2l\u00e2 bir merak konusu\u2026<\/p>\n
Dr. Ferrin, \u201cISON kuyrukluy\u0131ld\u0131z\u0131 tuhaf bir davran\u0131\u015f ger\u00e7ekle\u015ftirdi.\u201d diyor ve ekliyor: \u201cISON kuyrukluy\u0131ld\u0131z\u0131n\u0131n gelece\u011fi parlak g\u00f6r\u00fcnm\u00fcyor.\u201d<\/p>\n
Kuyrukluy\u0131ld\u0131zlar G\u00fcne\u015f \u00e7evresinden bir\u00e7ok kez ge\u00e7tikten sonra gaz ve buz k\u00fctlelerini tamamen kaybederek bir ta\u015f par\u00e7as\u0131na d\u00f6n\u00fc\u015f\u00fcrler. Astronomlar kuyruklu y\u0131ld\u0131z\u0131n buz katmanlar\u0131n\u0131n erimi\u015f olabilece\u011fini ya da parlamas\u0131n\u0131 sa\u011flayan gaz katmanlar\u0131n\u0131n yok olabilece\u011fini d\u00fc\u015f\u00fcn\u00fcyor. Ayn\u0131 zamanda uzun bir periyoda sahip kuyrukluy\u0131ld\u0131z\u0131n daha \u00f6nce de G\u00fcne\u015f \u00e7evresinden ge\u00e7mi\u015f olma ihtimali g\u00f6z \u00f6n\u00fcnde tutuluyor. Ancak yap\u0131lan g\u00f6zlemlerde ISON\u2019un G\u00fcne\u015f sisteminin i\u00e7 kesimlerini ilk ziyareti oldu\u011funu biliyoruz. E\u011fer ki kuyruklu y\u0131ld\u0131z bu \u015fekilde yolculu\u011funa devam ederse G\u00fcne\u015f taraf\u0131ndan yutulabilir ya da y\u00fcksek \u00e7ekim g\u00fcc\u00fcnden \u00e7ekirde\u011fi par\u00e7alanabilir. Neler olaca\u011f\u0131n\u0131 hen\u00fcz bilmiyoruz. Ancak ISON bize yeni bir oyun oynayabilir. 2007 y\u0131l\u0131nda Holmes kuyrukluy\u0131ld\u0131z\u0131 beklenenden 6-7 kat daha fazla parlakl\u0131\u011fa ula\u015fm\u0131\u015f ve \u00e7\u0131plak g\u00f6z ile g\u00f6zlemlenebilmi\u015fti. ISON\u2019da yeniden beklenen parlakl\u0131\u011fa ula\u015fabilir. Bunu anlayabilmemiz i\u00e7in kuyrukluy\u0131ld\u0131z\u0131n bize biraz daha yakla\u015fmas\u0131n\u0131 beklemek zorunday\u0131z.<\/p>\n
<\/p>\n
Kaynak: \u00a0<\/strong>NASA ve Spitzer ISON (C\/2012 S1) kuyrukluy\u0131ld\u0131z\u0131n\u0131 21 Eyl\u00fcl 2012 tarihinde ke\u015ffettik. Ke\u015ffetti\u011fimizde bizden 940 milyon kilometre uzakl\u0131ktayd\u0131. Bahsi ge\u00e7en bu kuyrukluy\u0131ld\u0131z \u00e7ok ilgin\u00e7 bir g\u00f6kcismi \u00e7\u00fcnk\u00fc g\u00fcne\u015f sisteminin olu\u015fumundan bu yana bozulmadan kalabilen tek kuyruklu y\u0131ld\u0131z ve olu\u015ftu\u011fu ilk g\u00fcnden bu yana sistemin \u00fcst k\u0131s\u0131mlar\u0131nda dolan\u0131rken ilk defa sistemin i\u00e7 k\u0131s\u0131mlar\u0131na do\u011fru harekete ge\u00e7ti. \u015eu anda ise […]<\/p>\n","protected":false},"author":754,"featured_media":11315,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[153,30,19,38],"tags":[791,792],"class_list":["post-11304","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-116-sayi","category-astronomi","category-bilim-gundemi","category-dergi-sayilari","tag-ison","tag-kuyrukluyildiz"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t
\n<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"