NGC 1023 is a

barred lenticular galaxy A lenticular galaxy (denoted S0) is a type of galaxy intermediate between an elliptical (denoted E) and a spiral galaxy in galaxy morphological classification schemes. It contains a large-scale disc but does not have large-scale spiral arms. L ...

, a member of the NGC 1023 group of galaxies in the

Local Supercluster The Virgo Supercluster (Virgo SC) or the Local Supercluster (LSC or LS) is a mass concentration of galaxies containing the Virgo Cluster and Local Group, which itself contains the Milky Way and Andromeda galaxies, as well as others. At least ...

. Distance measurements vary from 9.3 to 19.7 million

parsec The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to or (au), i.e. . The parsec unit is obtained by the use of parallax and trigonometry, and ...

s (30 to 64 million

light-year A light-year, alternatively spelled light year, is a large unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (), or 5.88 trillion miles ().One trillion here is taken to be 1012 ...

s). The

supermassive black hole A supermassive black hole (SMBH or sometimes SBH) is the largest type of black hole, with its mass being on the order of hundreds of thousands, or millions to billions of times the mass of the Sun (). Black holes are a class of astronomical obj ...

at the core has a mass of . The black hole was discovered by analyzing the dynamics of the galaxy. NGC 1023 is included in

Halton Arp Halton Christian "Chip" Arp (March 21, 1927 – December 28, 2013) was an American astronomer. He was known for his 1966 ''Atlas of Peculiar Galaxies'', which (it was later theorized) catalogues many examples of interacting and merging galaxie ...

Atlas of Peculiar Galaxies The ''Atlas of Peculiar Galaxies'' is a catalog of peculiar galaxies produced by Halton Arp in 1966. A total of 338 galaxies are presented in the atlas, which was originally published in 1966 by the California Institute of Technology. The p ...

, under the category "Galaxies with Nearby Fragments" under the number 135. NGC 1023 has been estimated to have about 490

globular cluster A globular cluster is a spheroidal conglomeration of stars. Globular clusters are bound together by gravity, with a higher concentration of stars towards their centers. They can contain anywhere from tens of thousands to many millions of membe ...

s, consistent with similar early-type galaxies. A number of small galaxies have been found around NGC 1023, the collection of which is labelled the "

NGC 1023 Group The NGC 1023 group is a group of galaxies about 20.6 million light-years away from Earth. It is a group in the Local Supercluster along with the Local Group. Members * Probable (dwarfs): DDO 024, DDO 025. * Possible members: NGC 672, IC 1 ...

." NGC 1023 has a satellite galaxy named NGC 1023A, which is a

Magellanic spiral Magellanic spiral galaxies are (usually) dwarf galaxies which are classified as the type Sm (and SAm, SBm, SABm). They are galaxies with one single spiral arm, and are named after their prototype, the Large Magellanic Cloud, an SBm galaxy. They ca ...

galaxy; its globular cluster system is much smaller, estimated to be around six individuals.

References

External links

* 1023 2154 10123

135 135 may refer to: * 135 (number) * AD 135 * 135 BC * 135 film, better known as 35 mm film, is a format of photographic film used for still photography *135 (New Jersey bus) 135 may refer to: * 135 (number) * AD 135 * 135 BC * 135 film, better know ...

NGC 1023 Group Perseus (constellation) Barred lenticular galaxies {{lenticular-galaxy-stub