Holmberg IX

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Holmberg IX
Holmberg IX GALEX WikiSky.jpg
Holmberg IX Dwarf Galaxy on GALEX, 9′ view
Observation data (2000 epoch)
Right ascension 09h 57m 32.1s[1]
Declination+69° 02′ 46″[1]
Distance12 Mly
(3.6 Mpc)[2]
Apparent magnitude (V)16.5 [1]
TypedI [1]
Apparent size (V)1.41 ± 0.07 [1]
Notable featuresSatellite galaxy of Messier 81
Other designations
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
See also: Galaxy, List of galaxies

Holmberg IX is a dwarf irregular galaxy and a satellite galaxy of M81. The galaxy is named after Erik Holmberg who first described it. Based on the observed age distribution of stars it contains it is thought to have formed within the last 200 Myr making it the youngest nearby galaxy.[3] It is also home to one of two newly discovered yellow supergiant eclipsing binary systems.[4][5]


  1. ^ a b c d e "UGC 5336". SIMBAD. Centre de données astronomiques de Strasbourg.
  2. ^ Prieto, J. L.; et al. (January 2008). "LBT Discovery of a Yellow Supergiant Eclipsing Binary in the Dwarf Galaxy Holmberg IX". The Astrophysical Journal. 673 (1): L59–L62. arXiv:0709.2376. Bibcode:2008ApJ...673L..59P. doi:10.1086/527415.
  3. ^ Sabbi, E.; Gallagher, J. S.; Smith, L. J.; de Mello, D. F.; Mountain, M. (March 2006). "Holmberg IX: The Nearest Young Galaxy". The Astrophysical Journal. 676 (2): L113–L117. arXiv:0802.4446. Bibcode:2008ApJ...676L.113S. doi:10.1086/587548.
  4. ^ "Two new Star Systems are the First of Their kind Ever Found". Archived from the original on 2008-04-02.
  5. ^ "Two Yellow Supergiant Eclipsing Binary Systems Discovered: First Of Their Kind Ever Found". Science Daily. 2008-04-01.

Further reading[edit]

External links[edit]

Coordinates: Sky map 09h 57m 32.1s, +69° 02′ 46″