| Holmberg II | |
|---|---|
 | |
| Observation data (J2000epoch) | |
| Constellation | Ursa Major |
| Right ascension | 08h 19m 04.98s[1] |
| Declination | +70° 43′ 12.1″[1] |
| Redshift | 0.000474 ± 0.000003[1] |
| Heliocentric radial velocity | 142±1[1] |
| Distance | 11.06Mly |
| Apparent magnitude (V) | 11.10[1] |
| Characteristics | |
| Type | Im[1] |
| Apparent size (V) | 7′.9 × 6′.3[1] |
| Other designations | |
| UGC 4305,PGC 23324,MCG +12-8-33,IRAS 08140+7052,Arp 268, DDO 50, Holmberg II, KUG 0814+708[1] | |
Holmberg II is anirregulardwarf galaxy in the constellationUrsa Major. Itsapparent magnitude is 11,1m and it is 11 millionlight years away from Earth. The galaxy is dominated by huge glowing gas bubbles, which are regions ofstar formation.[2][3]
Holmberg II also hosts an ultraluminousX-ray source. One hypothesis suggests that is caused by an intermediate massblack hole that is pulling surrounding material.[2] Holmberg II was discovered byErik Bertil Holmberg.
Media related toHolmberg II at Wikimedia Commons