Holmberg IX

Short description: Dwarf irregular galaxy in the constellation of Ursa Major

Holmberg IX

Hubble Space Telescope Image of the dwarf irregular galaxy Holmberg IX

Observation data (J2000 epoch)
Constellation| Ursa Major
Right ascension|  09h 57m 32.1s[1]
Declination| +69° 02′ 46″[1]
Distance| 12 Mly
(3.6 Mpc)[2]
Apparent magnitude (V)| 16.5[1]
Characteristics
Type| dI[1]
Apparent size (V)| 1.41 ± 0.07[1]
Notable features| Satellite 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

Holmberg IX is a dwarf irregular galaxy and a satellite galaxy of M81, located in the constellation of Ursa Major. The galaxy is named after Erik Holmberg who first described it. Based on the observed age distribution of stars it contains, a whole 20% of its stellar mass formed within the last 200 Myr, making it the youngest nearby galaxy.[3] It is also home to one of two yellow supergiant eclipsing binary systems.[4][5]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 "UGC 5336". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=UGC+5336.
2. ↑ Prieto, J. L. (January 2008). "LBT Discovery of a Yellow Supergiant Eclipsing Binary in the Dwarf Galaxy Holmberg IX". The Astrophysical Journal 673 (1): L59–L62. doi:10.1086/527415. Bibcode: 2008ApJ...673L..59P.
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. doi:10.1086/587548. Bibcode: 2008ApJ...676L.113S.
4. ↑ "Two new Star Systems are the First of Their kind Ever Found". Archived from the original on 2008-04-02. https://web.archive.org/web/20080402133205/http://researchnews.osu.edu/archive/superyellow.htm.
5. ↑ "Two Yellow Supergiant Eclipsing Binary Systems Discovered: First Of Their Kind Ever Found". Science Daily. 2008-04-01. https://www.sciencedaily.com/releases/2008/03/080331135542.htm.

## Further reading

* Winter, Lisa M.; Mushotzky, Richard F.; Reynolds, Christopher S. (2007). "Elemental Abundances of Nearby Galaxies through High Signal-to-Noise Ratio XMM-Newton Observations of Ultraluminous X-Ray Sources". The Astrophysical Journal 655 (1): 163–178. doi:10.1086/510200. Bibcode: 2007ApJ...655..163W.
* Fabien, Grisé; Pakull, Manfred W.; Motch, Christian (2006-05-12). "The Ultraluminous X-ray Source in Holmberg IX and its Environment". Proceedings of the International Astronomical Union 1 (S230): 302–303. doi:10.1017/S1743921306008519. Bibcode: 2006IAUS..230..302G.
* Makarova, L.; Grebel, E. K.; Karachentsev, I. D.; Dolphin, A. E.; Karachentseva, V. E.; Sharina, M. E.; Geisler, D.; Guhathakurta, P. et al. (2002). "Tidal dwarfs in the M81 group: the second generation?". Astronomy and Astrophysics 396 (2): 473–487. doi:10.1051/0004-6361:20021426. Bibcode: 2002A&A...396..473M.
* Schulte-Ladbeck, R. E.; Hopp, U. (1987). "The Dwarf Irregular Galaxy Holmberg IX". Mitteilungen der Astronomischen Gesellschaft 70: 427. Bibcode: 1987MitAG..70..427S.
* Bertola, F.; Maffei, P. (1974). "Two Faint Companions to M81". Astronomy and Astrophysics 32: 117. Bibcode: 1974A&A....32..117B.
* Holmberg, E. (1969). "A study of physical groups of galaxies". Arkiv för Astronomi 5: 305–343. Bibcode: 1969ArA.....5..305H.
* van den Bergh, Sidney (1959). "A catalogue of dwarf galaxies". Publications of the David Dunlap Observatory (University of Toronto) 2 (5): 147. Bibcode: 1959PDDO....2..147V.

## External links

* M81's satellite galaxy Holmberg IX
* Holmberg IX: XMM1
* GALEX Completes Four Star-Studded Years in Space
* Dwarf Galaxy Holmberg IX
*   * Holmberg IX on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

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

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