NGC 23 is a

spiral galaxy Spiral galaxies form a galaxy morphological classification, class of galaxy originally described by Edwin Hubble in his 1936 work ''The Realm of the Nebulae''

constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The first constellati ...

Pegasus Pegasus (; ) is a winged horse in Greek mythology, usually depicted as a white stallion. He was sired by Poseidon, in his role as horse-god, and foaled by the Gorgon Medusa. Pegasus was the brother of Chrysaor, both born from Medusa's blood w ...

, around distant from the

Milky Way The Milky Way or Milky Way Galaxy is the galaxy that includes the Solar System, with the name describing the #Appearance, galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars in other arms of the galax ...

. It was discovered by

William Herschel Frederick William Herschel ( ; ; 15 November 1738 – 25 August 1822) was a German-British astronomer and composer. He frequently collaborated with his younger sister and fellow astronomer Caroline Herschel. Born in the Electorate of Hanover ...

on 10 September 1784. In the ''Webb Society Deep-Sky Observer's Handbook'', the visual appearance of NGC 23 is described as follows:

Bright, extended ellipse; a bright nuclear structure is noticeably elongated; two weak spiral enhancements emerge from opposite sides of the nucleus, one curving towards a bright star attached on the south end. The galaxy is likely interacting with
NGC 9 NGC 9 is a spiral galaxy about 140 million light-years away in the Pegasus constellation. It was discovered on 27 September 1865 by Otto Wilhelm von Struve. One supernova A supernova (: supernovae or supernovas) is a powerful and luminous ...
.

The shape of this galaxy is described by its morphological classification of SBb, which indicates it is a

barred spiral A barred spiral galaxy is a spiral galaxy with a central bar-shaped structure composed of stars. Bars are found in about two thirds of all spiral galaxies in the local universe, and generally affect both the motions of stars and interstellar gas ...

(SB) with spiral arms that are moderately tightly wound (b). It is a

luminous infrared galaxy Luminous infrared galaxies or LIRGs are galaxies with luminosities, the measurement of brightness, above . They are also referred to as submillimeter galaxies (SMGs) through their normal method of detection. LIRGs are more abundant than starburst ...

with star-forming clumps.

NGC 23 group

NGC 23 is part of the NGC 23

group A group is a number of persons or things that are located, gathered, or classed together. Groups of people * Cultural group, a group whose members share the same cultural identity * Ethnic group, a group whose members share the same ethnic iden ...

(also known as LGG 2) that includes at least 6 other galaxies:

NGC 1 NGC 1 is an intermediate spiral galaxy of the morphological type Sbc, located in the constellation of Pegasus. It was discovered on 30 September 1861 by Heinrich d'Arrest. Observation history Heinrich d'Arrest discovered NGC 1 on 30 Sep 186 ...

NGC 26 NGC 26 is a spiral galaxy in the Pegasus constellation. It was discovered on 14 September 1865 by Heinrich Louis d'Arrest. NGC 23 group NGC 26 is part of the NGC 23 group A group is a number of persons or things that are located, gathered, ...

, UGC 69, UGC 79, UGC 110, and UGC 127.

Supernova

One

supernova A supernova (: supernovae or supernovas) is a powerful and luminous explosion of a star. A supernova occurs during the last stellar evolution, evolutionary stages of a massive star, or when a white dwarf is triggered into runaway nuclear fusion ...

has been observed in NGC 23. SN 1955C (type unknown, mag. 16) was discovered by

Allan Sandage Allan Rex Sandage (June 18, 1926 – November 13, 2010) was an American astronomer. He was Staff Member Emeritus with the Carnegie Observatories in Pasadena, California. He determined the first reasonably accurate values for the Hubble const ...

in September 1958 using the

Hale Telescope The Hale Telescope is a , 3.3 reflecting telescope at the Palomar Observatory in San Diego County, California, US, named after astronomer George Ellery Hale. With funding from the Rockefeller Foundation in 1928, he orchestrated the planning, de ...

. On a photographic plate taken 23 October 1955 (three years prior), a bright star with a visual magnitude around 16 was located to the north and east of the galactic center. The star was not visible on a photograph taken 60 days prior.

References

External links

* * {{DEFAULTSORT:NGC 0023 Barred spiral galaxies Luminous infrared galaxies NGC 0023 0023 00089 Markarian galaxies 000698 Galaxies discovered in 1784 Discoveries by William Herschel

NGC 23 group

Supernova

See also

References

External links