NGC 1023

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 (4.4±0.5)×10⁷ M_☉.^[4] The black hole was discovered by analyzing the dynamics of the galaxy.^[5]

NGC 1023
Hubble Space Telescope image of NGC 1023
Observation data (J2000 epoch)
Constellation	Perseus
Right ascension	02h 40m 24.0s[1]
Declination	+39° 03′ 48″[1]
Redshift	0.002125[1]
Heliocentric radial velocity	637 ± 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]
Absolute magnitude (V)	−21.2[2]
Characteristics
Type	SB0[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.^[6]

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."^[7] 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]