Galaxy NGC 1023

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 October 18, 1786 by Wilhelm 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]

«Catalogue of Principal Galaxies (PGC)», Paturel et al. 1989 [144]
NameRA [hms]Dec [dms]mTypeDim [']Btot [mag]HRV [km/s]PA [°]
NGC 102302 40 24.1+39 03 46LB8.1 x 3.410.563287
NGC 1023A02 40 37.7+39 03 29IB M1.3 x .713.874350

Finder Chart

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

Perseus: NGC 1023
Chart NGC 1023
Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]


144Catalogue of Principal Galaxies (PGC); Paturel G., Fouque P., Bottinelli L., Gouguenheim L.; Astron. Astrophys. Suppl. Ser. 80, 299 (1989); (2021-02-18)
149SkySafari 6 Pro, Simulation Curriculum;
160The STScI Digitized Sky Survey;
199Atlas Of Peculiar Galaxies, Halton Arp; (2020-12-28)
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