NGC 1023

NGC 1023 is a barred lenticular galaxy, a member of the NGC 1023 group of galaxies in the Local Supercluster. Distance measurements vary from 9.3 to 19.7 million parsecs (30 to 64 million light-years).[1] The supermassive black hole at the core has a mass of (4.4±0.5)×107 M.[2] The black hole was discovered by analyzing the dynamics of the galaxy.[3]

NGC 1023
NGC1023 JeffJohnson.jpg
Barred lenticular galaxy NGC 1023
Observation data (J2000 epoch)
Right ascension 02h 40m 24.0s[1]
Declination+39° 03′ 48″[1]
Helio radial velocity637 ± 4 km/s[1]
Distance~19 Mly (Light Travel-Time redshift-based)[1]
30 to 64 Mly (measured)[1]
Apparent magnitude (V)10.35[1]
Apparent size (V)8.7' x 3.0'[1]
Other designations
UGC 2154, PGC 10123, MCG+06-06-073, Arp 135

NGC 1023 is included in Halton Arp's Atlas of Peculiar Galaxies, under the category "Galaxies with Nearby Fragments" under the number 135.[4]

A number of small galaxies have been found around NGC 1023, the collection of which is labelled the "NGC 1023 group."[5]


  1. ^ a b c d e f g h i j "NASA/IPAC Extragalactic Database". Results for NGC 1023. Retrieved 2012-10-17.
  2. ^ Graham, Alister W. (November 2008), "Populating the Galaxy Velocity Dispersion - Supermassive Black Hole Mass Diagram: A Catalogue of (Mbh, σ) Values", Publications of the Astronomical Society of Australia, 25 (4): 167–175, arXiv:0807.2549, Bibcode:2008PASA...25..167G, doi:10.1071/AS08013.
  3. ^ Bower, G. A.; Green, R. F.; Bender, R.; Gebhardt, K.; Lauer, T. R.; Magorrian, J.; Richstone, D. O.; Danks, A.; Gull, T.; Hutchings, J.; Joseph, C. (2001-03-20). "Evidence of a Supermassive Black Hole in the Galaxy NGC 1023 from the Nuclear Stellar Dynamics". The Astrophysical Journal. 550 (1): 75–86. doi:10.1086/319730. ISSN 0004-637X.
  4. ^ Arp, Halton (1966). Atlas of Peculiar Galaxies. Pasadena, California: California Institute of Technology. Retrieved 5 Jan 2010. (webpage includes PDF link)
  5. ^ "1980ApJ...237..390T Page 390". Retrieved 2020-06-17.

External linksEdit