Holmberg IX
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. It is also home to one of two yellow supergiant eclipsing binary systems.
| 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 |
| Declination | +69° 02′ 46″ |
| Distance | 12 Mly (3.6 Mpc) |
| Apparent magnitude (V) | 16.5 |
| Characteristics | |
| Type | dI |
| Apparent size (V) | 1.41 ± 0.07 |
| 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 | |
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