IOK-1

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.^[2]

IOK-1
IOK-1 by the Subaru Telescope
Observation data (J2000 epoch)
Constellation	Coma Berenices
Right ascension	13h 23m 59.8s[1]
Declination	+27° 24′ 56″[1]
Redshift	6.964[1]
Distance	12.88 billion light-years (3.95 Gpc)
Apparent magnitude (V)	24.4
Characteristics
Type	LAE
Size	4,000 ly (1,200 pc) (diameter) 2,000 ly (610 pc) (radius)
Apparent size (V)	0.001 x 0.001
Other designations
JEM2013 62, OIK2017 NB973-SDF-85821, OMS2009 SDF-63544[1]

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 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 Abell 1835 IR1916) to be even older, the IOK-1's age and composition have been more reliably established.^[3][4]

"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