NGC 1128

NGC 1128 is a dumbbell galaxy in the Abell 400 galaxy cluster. At the center of the galaxy is 3C 75, a radio source, and contains two orbiting supermassive black holes that may be merging. Computer simulations indicate that these two black holes will gradually spiral in toward each other until they merge. Lewis Swift is credited with the discovery of NGC 1128 in 1886. ^[3]

SDSS image of NGC 1128

NGC 1128
Binary black hole system 3C 75 contained in the dumbbell shaped galaxy NGC 1128
Observation data (J2000 epoch)
Constellation	Cetus
Right ascension	02h 57m 41.6s[1]
Declination	+06° 01′ 29″[1]
Redshift	6940 ± 20 km/s[1]
Distance	300 Mly[2]
Apparent magnitude (V)	13.8[1]
Characteristics
Type	E0[1]
Apparent size (V)	0'.9 × 0'.4[1]
Notable features	Dumbbell-shaped galaxy
Other designations
PGC 11188, 11189[1]