NGC 1128

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NGC 1128
Binary black hole system 3C 75 contained in the dumbbell shaped galaxy NGC 1128
Observation data (J2000 epoch)
Right ascension 2h 57m 41.6s[1]
Declination +6° 01′ 29″[1]
Redshift 6940 ± 20 km/s[1]
Distance 300 Mly[2]
Apparent magnitude (V) 13.8[1]
Type E0[1]
Apparent size (V) 0'.9 × 0'.4[1]
Notable features Dumbbell-shaped galaxy
Other designations
PGC 11188[1]
See also: Galaxy, List of galaxies

NGC 1128 is a "dumbbell galaxy" in the Abell 400 galaxy cluster. It is the center of the 3C75 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]


  1. ^ a b c d e f g "NASA/IPAC Extragalactic Database". Results for. Retrieved 2006-10-26.
  2. ^
  3. ^ Seligman, Courtney. "Celestial Atlas: NGC Objects: NGC 1100 - 1149". Archived from the original on 25 July 2015. Retrieved 25 July 2015.

External links[edit]

Coordinates: Sky map 02h 57m 41.6s, +06° 01′ 29″