IOK-1
Galaxy in constellation Coma Berenices
title: "IOK-1" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["galaxies", "coma-berenices"] description: "Galaxy in constellation Coma Berenices" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/IOK-1" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Galaxy in constellation Coma Berenices ::
::data[format=table title="Infobox Galaxy"]
| Field | Value |
|---|---|
| name | IOK-1 |
| image | File:IOK-1.jpg |
| caption | IOK-1 by the Subaru Telescope |
| epoch | J2000 |
| type | LAE |
| ra | |
| dec | |
| dist_ly | 12.88 e9ly |
| z | 6.964 |
| appmag_v | 24.4 |
| constellation name | Coma Berenices |
| names | JEM2013 62, OIK2017 NB973-SDF-85821, OMS2009 SDF-63544 |
| size | 4000 ly (diameter) |
| 2000 ly | |
| (radius) | |
| size_v | 0.001 x 0.001 |
| :: |
| name = IOK-1 | image = File:IOK-1.jpg | caption = IOK-1 by the Subaru Telescope | epoch = J2000 | type = LAE | ra = | dec = | dist_ly = 12.88 e9ly | z = 6.964 | appmag_v = 24.4 | constellation name = Coma Berenices | notes = | names = JEM2013 62, OIK2017 NB973-SDF-85821, OMS2009 SDF-63544 | size = 4000 ly (diameter) 2000 ly (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.
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.
"IOK" stands for the observers' names Iye, Ota, and Kashikawa.
References
References
- "IOK 1".
- Hogan, Jenny. (2006). "Journey to the birth of the Universe". [[Nature (journal).
- (2006). "A galaxy at a redshift z = 6.96". Nature.
- (September 13, 2006). "Press release". National Astronomical Observatory of Japan.
::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::