Holmberg IX
Dwarf irregular galaxy in the constellation of Ursa Major
title: "Holmberg IX" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["interacting-galaxies", "dwarf-irregular-galaxies", "ugc-objects", "principal-galaxies-catalogue-objects", "leda-objects", "ursa-major", "m81-group"] description: "Dwarf irregular galaxy in the constellation of Ursa Major" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/Holmberg_IX" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Dwarf irregular galaxy in the constellation of Ursa Major ::
::data[format=table title="Infobox Galaxy"]
| Field | Value |
|---|---|
| name | Holmberg IX |
| image | File:Hubble_dwarf_galaxy_Holmberg_IX.jpg |
| image_size | 250px |
| caption | Hubble Space Telescope image of the dwarf irregular galaxy Holmberg IX |
| epoch | J2000 |
| ra | |
| dec | |
| constellation name | Ursa Major |
| dist_ly | 12 Mly |
| (3.6 Mpc) | |
| type | dI |
| appmag_v | 16.5 |
| size_v | 1.41 ± 0.07 |
| notes | Satellite galaxy of Messier 81 |
| names | UGC 5336, [B93] 17, DDO 66, 2E 0953.7+6918, 2E 2199, 1ES 0953+69.3, HIJASS J0957+69A, Holmberg IX, [IW2001] H42, [IW2001] P63, K68 62, LEDA 28757, Mailyan 48, MCG+12-10-012, [MI94] Im 62, SPB 118, PGC 28757 |
| :: |
| name = Holmberg IX | image = File:Hubble_dwarf_galaxy_Holmberg_IX.jpg | image_size = 250px | caption = Hubble Space Telescope image of the dwarf irregular galaxy Holmberg IX | epoch = J2000 | ra = | dec = | constellation name = Ursa Major | z = | dist_ly = 12 Mly (3.6 Mpc) | type = dI | appmag_v = 16.5 | size_v = 1.41 ± 0.07 | notes = Satellite galaxy of Messier 81 | names = UGC 5336, [B93] 17, DDO 66, 2E 0953.7+6918, 2E 2199, 1ES 0953+69.3, HIJASS J0957+69A, Holmberg IX, [IW2001] H42, [IW2001] P63, K68 62, LEDA 28757, Mailyan 48, MCG+12-10-012, [MI94] Im 62, SPB 118, PGC 28757
Holmberg IX is a dwarf irregular galaxy and a satellite galaxy of M81, located in the constellation of Ursa Major. It is a Magellanic type galaxy, similar to the Small Magellanic Cloud, neighbour galaxy to the Milky Way Galaxy. The galaxy is named after Erik Holmberg who first described it, though it was originally discovered by Sidney van den Bergh in 1959. Based on the observed age distribution of stars it contains, 20% of its stellar mass formed within the last 200 Myr, making it the youngest nearby galaxy. It is also home to one of two yellow supergiant eclipsing binary systems designated Holmberg IX V1.
References
References
- "UGC 5336".
- Prieto, J. L.. (January 2008). "LBT Discovery of a Yellow Supergiant Eclipsing Binary in the Dwarf Galaxy Holmberg IX". [[The Astrophysical Journal]].
- (8 January 2008). "Holmberg IX news from Hubblesite".
- (1959). "A Catalogue of Dwarf Galaxies". Publications of the David Dunlap Observatory.
- (March 2006). "Holmberg IX: The Nearest Young Galaxy". [[The Astrophysical Journal]].
- "Two new Star Systems are the First of Their kind Ever Found".
- (2008-04-01). "Two Yellow Supergiant Eclipsing Binary Systems Discovered: First Of Their Kind Ever Found". [[Science Daily]].
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