NGC 1023 explained

NGC 1023
Epoch:	J2000
Constellation Name:	Perseus
Z:	0.002125^[1]
Dist Ly:	~19 Mly (Light Travel-Time redshift-based) 30 to 64 Mly (measured)
Type:	SB0
Appmag V:	10.35
Absmag V:	-21.2^[2]
Size V:	8.7' x 3.0'
Names:	UGC 2154, PGC 10123, MCG+06-06-073, Arp 135

NGC 1023, also known as the Perseus Lenticular Galaxy,^[3] 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 . The black hole was discovered by analyzing the dynamics of the galaxy.^[4]

NGC 1023 is included in Halton Arp's Atlas of Peculiar Galaxies, under the category "Galaxies with Nearby Fragments" under the number 135.^[5]

NGC 1023 has been estimated to have about 490 globular clusters, consistent with similar early-type galaxies.^[2] A number of small galaxies have been found around NGC 1023, the collection of which is labelled the "NGC 1023 Group."^[6] NGC 1023 has a satellite galaxy named NGC 1023A, which is a Magellanic spiral galaxy; its globular cluster system is much smaller, estimated to be around six individuals.^[2]

Notes and References

1. Web site: NASA/IPAC Extragalactic Database . Results for NGC 1023 . 2012-10-17.
2. 2012AJ....144..103Y. Globular Cluster Systems of Spiral and S0 Galaxies: Results from WIYN Imaging of NGC 1023, NGC 1055, NGC 7332, and NGC 7339 . Young . Michael D. . Dowell . Jessica L. . Rhode . Katherine L. . The Astronomical Journal . 2012 . 144 . 4 . 103 . 10.1088/0004-6256/144/4/103 . 1210.4476 . 62792507 .
3. Book: Stoyan, Ronald. Schurig. Stephan. interstellarum Deep Sky Atlas. Cambridge University Press; Oculum-Verlag GmbH. Erlangen. 2014. 978-1-107-50338-0. 920437579.
4. 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. 10.1086/319730. astro-ph/0011204. 2001ApJ...550...75B. 118949563. 0004-637X.
5. Book: Arp, Halton. Atlas of Peculiar Galaxies. California Institute of Technology. Pasadena, California. 1966. 5 Jan 2010. (webpage includes PDF link)
6. Nearby groups of galaxies. I. The NGC 1023 group.. Tully, R. B.. 1980ApJ...237..390T. 1980. Astrophysical Journal. 237. 390–403. 10.1086/157881 .