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 primary goal of the catalog was to present photographs of examples of the different kinds of peculiar structures found among galaxies.
NGC 2207 and IC 2163 are a pair of colliding spiral galaxies about 80 million light-years away in the constellation Canis Major. Both galaxies were discovered by John Herschel in 1835.
NGC 5090 and NGC 5091 are a set of galaxies approximately 160 million light-years away in the constellation Centaurus. They are in the process of colliding and merging with some evidence of tidal disruption of NGC 5091.
NGC 277 is a lenticular galaxy located in the constellation Cetus. It was discovered on October 8, 1864, by the German astronomer Heinrich Louis d'Arrest. The galaxy is situated near the celestial equator, making it observable from both the Northern and Southern Hemispheres at various times of the year. With an apparent B magnitude of 13, NGC 277 requires a telescope with an aperture of at least 10 inches for proper observation.
NGC 298 is a spiral galaxy in the constellation Cetus. It was discovered on September 27, 1864, by Albert Marth. NGC 298 is situated close to the celestial equator and, as such, it is at least partly visible from both hemispheres in certain times of the year. Given its B magnitude of 14.7, NGC 298 is visible with the help of a telescope having an aperture of 20 inches or more.
NGC 435 is an intermediate spiral galaxy located around 478 million light-years away in the constellation Cetus. NGC 435 was discovered on October 23, 1864 by Albert Marth, and it does not have an active galactic nucleus or much star-formation.
NGC 4633 is a spiral galaxy located about 70 million light-years away in the constellation of Coma Berenices. It is interacting with the nearby galaxy NGC 4634. NGC 4633 was discovered by astronomer Edward D. Swift on April 27, 1887. It was rediscovered on November 23, 1900, by astronomer Arnold Schwassmann and was later listed as IC 3688. NGC 4633 is a member of the Virgo Cluster.
NGC 3312 is a large and highly inclined spiral galaxy located about 194 million light-years away in the constellation Hydra. The galaxy was discovered by astronomer John Herschel on March 26, 1835. It was later rediscovered by astronomer Guillaume Bigourdan on February 26, 1887. NGC 3312 was later listed and equated with IC 629 because the two objects share essentially the same celestial coordinates. NGC 3312 is the largest spiral galaxy in the Hydra Cluster and is also classified as a LINER galaxy.
NGC 1351 is a lenticular galaxy in the constellation Fornax. It has a redshift of z=0.00505, and its distance from Earth can be estimated as 21 million parsecs. It is elongated in shape, and was discovered by William Herschel on October 19, 1835.
NGC 4825 is a lenticular galaxy located around 230 million light-years away in the constellation Virgo. NGC 4825 was discovered on March 27th, 1786 by the astronomer William Herschel, and its diameter is 133,000 light-years across. NGC 4825 is not known to have much star-formation, and it does not have an active galactic nucleus.
NGC 3110, also known as NGC 3122 and NGC 3518, is an active spiral galaxy in the constellation Sextans. It contains extensive Hubble-type Sb star-forming regions, and is located south of the celestial equator. It is estimated to be 218 million light-years from the Milky Way and has a diameter of around 100,000 ly. Together with PGC 29184 it forms a gravitationally bound galaxy pair. Located in the same area of the sky is the galaxy IC 589.
NGC 561 is a barred spiral galaxy located in the constellation Andromeda. Its speed relative to the cosmic microwave background is 4,395 ± 20 km/s, which corresponds to a Hubble distance of 64.8 ± 4.6 Mpc. NGC 561 was discovered by Prussian astronomer Heinrich d'Arrest in 1862.
NGC 646 is a large barred spiral galaxy located in the constellation Hydrus. Its speed relative to the cosmic microwave background is 8,145 ± 19 km/s, which corresponds to a Hubble distance of 120.1 ± 8.4 Mpc. NGC 646 was discovered by British astronomer John Herschel in 1834. It forms an interacting galaxy pair.
NGC 716 is a large barred spiral galaxy located in the constellation Aries, about 200 million light-years away from the Milky Way. The luminosity class of NGC 716 is I and has a large HI line. It also contains regions of ionized hydrogen. Many non-redshift measurements provide a distance of 54,023±8,169 Mpc, which is within the distances calculated using the redshift value.
NGC 3647 is a small elliptical galaxy in the Leo constellation. The galaxy was first discovered on March 22, 1865 by Albert Marth who was a German astronomer. It is approximately 747 million light-years away. Due to its close proximity to five other elliptical galaxies, there was a bit of confusion for Marth to identify which object is NGC 3647.
NGC 3908 is one of the furthest NGC objects. It is an elliptical galaxy located 1.2 billion light-years away in the Leo constellation with an estimated 280,000 thousand light-years across in diameter. It was discovered on April 10, 1885, by Lewis Swift, who found the object too faint for the naked eye to see. The identification of the celestial object observed by Swift is uncertain. The coordinates place it approximately 7.5 arcminutes south-southwest of a galaxy previously listed, potentially identifying it as PGC 36967. However, astronomers Corwin and Gottlieb argue that the object is much fainter than Swift's descriptions suggest, indicating it may have been too faint for him to observe. Although the right ascension aligns with another of Swift's discoveries on the same night, the discrepancy in declination is notably larger. It remains unclear if PGC 36967 is NGC 3908, and it is equally probable that Swift's observed object is "lost," with any nearby galaxy merely coincidental to Swift's original position. Due to its relatively large size, NGC 3908 is considered a brightest cluster galaxy, a BCG.
NGC 626 is a very large barred spiral galaxy located in the constellation Sculptor. Its speed relative to the cosmic microwave background is 5,475 ± 16 km/s, which corresponds to a Hubble distance of 80.8 ± 5.7 Mpc. NGC 626 was discovered by British astronomer John Herschel in 1834.
NGC 5008 is a massive barred spiral galaxy located in the Boötes constellation.
NGC 6331 is a type E elliptical galaxy located in the Ursa Minor constellation. It is located 737 million light-years from the Solar System and was discovered by German-British astronomer William Herschel on December 20, 1797, utilizing an 18.7-inch f/13 spectrum telescope but also observed by Guillaume Bigourdan.
IC 1166 are a pair of galaxies in the Corona Borealis constellation comprising IC 1166 NED01 and IC 1166 NED02. They are located 977 million light-years from the Solar System and were discovered on July 28, 1892, by Stephane Javelle.
