UGC 5139
Constellation | Big Bear |
Position ( equinox : J2000.0 ) | |
Right ascension | 9h 40m 32.3s |
declination | + 71 ° 10 '56 " |
Appearance | |
Hubble type | IAB (s) m |
Apparent brightness (visual) | +13 m |
Apparent brightness (B-band) | |
Apparent diameter | 3.6 '× 3' |
Surface brightness | mag / arcmin 2 |
Physical data | |
Affiliation | M81 group |
distance | 12.52 million light years |
Redshift | +0.000465 ± 0.000000 |
Heliocentric radial relative speed | 139 ± 0 km / s |
Absolute brightness | |
Absolute diameter | 15,000 light years |
Dimensions | 5.5 × 10 8 solar masses |
Catalog names | |
UGC 5139, PGC 27605, MCG + 12-09-059, DDO 63, Holmberg I, Mailyan 44 |
UGC 5139 , also named Holmberg I after its discoverer , is a dwarf galaxy in the constellation Great Bear , about 12.5 million light years away from Earth .
discovery
The galaxy UGC 5139 was discovered by the Swedish astronomer Erik Bertil Holmberg in the 1950s .