Holmberg 15A | |
---|---|
Observation data (J2000.0 epoch) | |
Constellation | Cetus |
Right ascension | 00h 41m 50.5s |
Declination | −09° 18′ 11″ |
Redshift | 0.055672 |
Heliocentric radial velocity | 16690 km/s |
Galactocentric velocity | 16747 km/s |
Distance | 704×10 6 ly (216 Mpc) h−1 0.678 |
Group or cluster | Abell 85 |
Apparent magnitude (V) | 14.7 |
Characteristics | |
Type | cD;BrClG |
Mass | 7×1013 M☉ |
Number of stars | 5×1012 |
Size | 270,000 ly (83 kpc) |
Apparent size (V) | 1.3 moa |
Other designations | |
Abell 85-BCG, PGC 2501 |
Holmberg 15A (abbreviated to Holm 15A) is a supergiant elliptical galaxy and the central dominant galaxy of the Abell 85 galaxy cluster in the constellation Cetus, about 700 million light-years from Earth.[1] It was discovered c. 1937 by Erik Holmberg.[2] It became well known when it was reported to have the largest core ever observed in a galaxy, spanning some 15,000 light years,[2] however this was subsequently refuted.[3][4]