Galaxy NGC 1023

NGC 1023: Galaxy in Perseus; 500 mm Cassegrain 5800mm f11.4; SBIG STL11K; 90-15-15-15 min LRGB; Bernese Highlands; © 2005 Radek Chromik


The galaxy NGC 1023 was discovered on 18th October 1786 by William Herschel with his 18.7 inch reflecting telescope. [277] Halton Arp listed NGC 1023 and the companion galaxy NGC 1023A in his 1966 «Atlas of Peculiar Galaxies» under the name Arp 135 as one Galaxy with nearby fragments. [199]

Physical Properties

In the center of this galaxy of morphological type SB(rs)0- is a supermassive black hole with about 40 to 60 million solar masses. The distance from NGC 1023 is approximately 11 Mpc. [428] The galaxy is the brightest member of the LGG 70 galaxy group. The closest companion is the magellanic, irregular dwarf galaxy NGC 1023A about 2.7 arc minutes east of the center of NGC 1023, which corresponds to a projected distance of about 8 kpc. The two galaxies are connected by a bridge of neutral hydrogen, suggesting an ongoing interaction that began about two billion years ago. [429]

Revised+Historic NGC/IC, Version 22/9, © Dr. Wolfgang Steinicke [277]
NameRADecTypebMagvMagB-VSBDimPAzD(z)MDDreyer DescriptionIdentification, Remarks
NGC 102302 40 24.1+39 03 48Gx (E/SB0) × 2.5870.0021258.9811.620vB, vL, vmE, vvmbMUGC 2154, MCG 6-6-73, CGCG 523-83, Arp 135
NGC 1023 A02 40 36.9+39 03 37Gx (IBm)14.313.60.713.81.3 × 0.7140.00247810.47vB, vL, vmE, vvmbMArp 135

Finder Chart

The galaxy NGC 1023 is located in the constellation Perseus. The best observation time is September to February.

Finder Chart Galaxy NGC 1023
Galaxy NGC 1023 in constellation Perseus. Charts created using SkySafari 6 Pro and STScI Digitized Sky Survey. Limiting magnitudes: Constellation chart ~6.5 mag, DSS2 close-ups ~20 mag. [149, 160]

Visual Observation

Description pending ...

More Objects Nearby (±15°)


  • [149] SkySafari 6 Pro, Simulation Curriculum;
  • [160] The STScI Digitized Sky Survey;
  • [199] «Atlas Of Peculiar Galaxies», Halton Arp, 1966; Astrophysical Journal Supplement, vol. 14, p.1 (1966); DOI:10.1086/190147; Bibcode:1966ApJS...14....1A;
  • [277] «Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; (2021-02-17)
  • [428] «Evidence of a Supermassive Black Hole in the Galaxy NGC 1023 from the Nuclear Stellar Dynamics» G. A. Bower, R. F. Green, R. Bender, K. Gebhardt, T. R. Lauer, J. Magorrian, D. O. Richstone, A. Danks, T. Gull, J. Hutchings, C. Joseph, M. E. Kaiser, D. Weistrop, B. Woodgate, C. Nelson, and E. M. Malumuth; The Astrophysical Journal, Volume 550, Number 1; DOI:10.1086/319730
  • [429] «The young nuclear stellar disc in the SB0 galaxy NGC 1023» E. M. Corsini, L. Morelli, N. Pastorello, E. Dalla Bontà, A. Pizzella, E. Portaluri; Monthly Notices of the Royal Astronomical Society, Volume 457, Issue 2, 01 April 2016, Pages 1198–1207; DOI:10.1093/mnras/stv2864