NGC 1023
Galaxy in the constellation Perseus
From Wikipedia, the free encyclopedia
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]
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