IOK-1

{{Short description|Galaxy in constellation Coma Berenices}} {{Infobox Galaxy | name = IOK-1 | image = File:IOK-1.jpg | caption = IOK-1 by the [[Subaru Telescope]] | epoch = [[J2000]] | type = LAE | ra = {{RA|13|23|59.8}}<ref name=SIMBAD>{{cite simbad|title=IOK 1|access-date=2023-07-31}}</ref> | dec = {{DEC|+27|24|56}}<ref name=SIMBAD/> | dist_ly = {{convert|12.88|e9ly|Gpc|lk=on}} | z = 6.964<ref name=SIMBAD/> | appmag_v = 24.4 | constellation name = [[Coma Berenices]] | notes = | names = JEM2013 62, OIK2017 NB973-SDF-85821, OMS2009 SDF-63544<ref name=SIMBAD/> | size = {{convert|4000|ly|pc|abbr=on|lk=on}} (diameter) <br /> {{convert|2000|ly|pc|abbr=on|lk=on}} <br />(radius) | size_v = 0.001 x 0.001 }}

'''IOK-1''' is a distant [[galaxy]] in the [[constellation]] [[Coma Berenices]]. When discovered in 2006, it was the oldest and most distant galaxy ever found, at [[redshift]] 6.96.<ref>{{Citation |last=Hogan |first=Jenny |year=2006 |title=Journey to the birth of the Universe |journal=[[Nature (journal)|Nature]] |volume=443 |issue=7108 |pages=128–129 |doi=10.1038/443128a |pmid=16971914 |bibcode = 2006Natur.443..128H |doi-access=free }}</ref>

It was discovered in April 2006 by [[Masanori Iye]] at [[National Astronomical Observatory of Japan]] using the [[Subaru Telescope]] in [[Hawaii]] and is seen as it was 12.88 [[1,000,000,000 (number)|billion]] years ago. Its emission of [[Lyman alpha radiation]] has a redshift of 6.96, corresponding to just 750 million years after the [[Big Bang]]. While some scientists have claimed other objects (such as [[Galaxy Abell 1835 IR1916|Abell 1835 IR1916]]) to be even older, the IOK-1's age and composition have been more reliably established.<ref>{{Citation |last1=Iye |first1=Masanori |last2=Ota |first2=Kazuaki |last3=Kashikawa |first3=Nobunari |last4=Furusawa |first4=Hisanori |last5=Hashimoto |first5=Tetsuya |last6=Hattori |first6=Takashi |last7=Matsuda |first7=Yuichi |last8=Morokuma |first8=Tomoki |last9=Ouchi |first9=Masami |year=2006 |title=A galaxy at a redshift z = 6.96 |journal=Nature |volume=443 |issue=7108 |pages=186–188 |doi=10.1038/nature05104 |pmid=16971942 |arxiv=astro-ph/0609393v1 |bibcode=2006Natur.443..186I|display-authors=9 |last10=Shimasaku |first10=Kazuhiro |s2cid=2876103 }}</ref><ref>{{Citation |publisher=National Astronomical Observatory of Japan |date=September 13, 2006 |title=Press release |url=http://www.subarutelescope.org/Pressrelease/2006/09/13/index.html }}</ref>

"IOK" stands for the observers' names Iye, Ota, and Kashikawa.

==See also== *[[Abell 2218]] *[[Abell 370]] *[[A1689-zD1]] *[[UDFy-38135539]] *[[List of the most distant astronomical objects]]

==References== {{Reflist}}

{{s-start}} {{s-bef|before=[[SDF J132522.3+273520]]}} {{s-ttl|title=[[List of the most distant astronomical objects|Most distant astronomical object]]|years=2006–2009}} {{s-aft|after=[[GRB 090423]]}} {{s-bef|before=[[SDF J132522.3+273520]]}} {{s-ttl|title=[[List of galaxies#Most distant galaxies|Most distant galaxy]]|years=2006–2011}} {{s-aft|after=[[BDF-3299]]}} {{s-end}}

{{DEFAULTSORT:IOK-1}} [[Category:Galaxies]] [[Category:Coma Berenices]] [[Category:Astronomical objects discovered in 2006]]