Seyfert's Sextet is a group of galaxies about 190 million light-years away in the constellation Serpens. The group appears to contain six members, but one of the galaxies, NGC 6027d, is a background object and another "galaxy," NGC 6027e, is actually a part of the tail from galaxy NGC 6027. The gravitational interaction among these galaxies should continue for hundreds of millions of years. Ultimately, the galaxies will merge to form a single giant elliptical galaxy.
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 5112 is a barred spiral galaxy in the constellation Canes Venatici. It was discovered on 17 March 1787 by German-British astronomer William Herschel. This galaxy is in close physical proximity to the edge-on dwarf spiral NGC 5107.
NGC 5334 is a face-on barred spiral galaxy in the constellation Virgo. Its velocity with respect to the cosmic microwave background is 1668 ± 20 km/s, which corresponds to a Hubble distance of 80.2 ± 5.7 Mly (24.60 ± 1.75 Mpc). However, five non-redshift measurements give a distance of 108.68 ± 7.45 Mly (33.320 ± 2.283 Mpc). It was discovered by German-British astronomer William Herschel on 15 April 1787. It was also observed by American astronomer Lewis Swift on 20 April 1897 and listed in the Index Catalogue as IC 4338.
NGC 145, also known as Arp 19, is a barred spiral galaxy in Cetus, notable for its three spiral arms.
NGC 14 is an irregular galaxy in the Pegasus constellation. It was included in Halton Arp's Atlas of Peculiar Galaxies, under the section "Galaxies with the appearance of fission," since the irregular appearance of this galaxy causes it to look like it is coming apart. It was discovered on September 18, 1786, by William Herschel.
NGC 21 is a spiral galaxy in the Andromeda constellation. It was discovered by German-British astronomer William Herschel on 26 November 1790. Lewis Swift observed it again in 1885, leading to its double listing in the New General Catalogue.
NGC 5792 is a barred spiral galaxy about 70 million light-years away in the constellation Libra. There is a magnitude 9.6 star on the northwestern edge of the galaxy. It was discovered on April 11, 1787, by the astronomer William Herschel. It is a member of the Virgo III Groups, a series of galaxies and galaxy clusters strung out to the east of the Virgo Supercluster of galaxies.
NGC 36 is a barred spiral galaxy in the constellation Pisces. It is located about 221 million light-years away. It was discovered in October 25, 1785, by the astronomer William Herschel.
NGC 5177 is a lenticular galaxy. Based on a redshift of 6467 km/s the galaxy is crudely estimated to be about 300 million light-years away.
NGC 7332 is an edge-on peculiar lenticular galaxy located about 67 million light-years away in the constellation Pegasus. It possesses a -shaped bulge, associated with stellar bar. It was discovered on September 19, 1784 by the astronomer William Herschel.
NGC 463 is a lenticular galaxy located about 264 million light-years away from Earth in the constellation Pisces. It was discovered by French astronomer Édouard Stephan on December 16, 1871.
NGC 7056 is a barred spiral galaxy located about 225 million light-years away in the constellation of Pegasus. NGC 7056 was discovered by astronomer Albert Marth on September 17, 1863. It was then rediscovered by astronomer Truman Henry Safford on September 29, 1866.
NGC 4440 is a barred spiral galaxy located about 55 million light-years away in the constellation of Virgo. NGC 4440 was discovered by astronomer William Herschel on April 17, 1784. It is a member of the Virgo Cluster.
NGC 2090 is a spiral galaxy located in the constellation Columba. Its velocity with respect to the cosmic microwave background is 994 ± 5 km/s, which corresponds to a Hubble distance of 47.8 ± 3.4 Mly (14.65 ± 1.03 Mpc). However, 51 non-redshift measurements give a distance of 42.46 ± 0.64 Mly (13.018 ± 0.197 Mpc). It was discovered on 29 October 1826 by Scottish astronomer James Dunlop. NGC 2090 was studied to refine the Hubble constant to an accuracy within ±10%.
NGC 6039 is a massive lenticular galaxy located about 460 million light-years away in the constellation Hercules. NGC 6039 was discovered by astronomer Édouard Stephan on June 27, 1870 and later rediscovered by astronomer Lewis Swift on June 27, 1886. NGC 6039 is member of the Hercules Cluster, which is part of the CfA2 Great Wall.
NGC 6041 is a giant elliptical galaxy located about 470 million light-years away in the constellation Hercules. NGC 6041 has an extended envelope that is distorted towards the galaxy pair Arp 122. NGC 6041 is the brightest galaxy (BCG) in the Hercules Cluster. The galaxy was discovered by astronomer Édouard Stephan on June 27, 1870.
NGC 3307 is a lenticular galaxy located about 185 million light-years away in the constellation Hydra. The galaxy was discovered by astronomer John Herschel on March 22, 1836 and is a member of the Hydra Cluster.
NGC 2300 is a lenticular galaxy in the constellation Cepheus. Its velocity with respect to the cosmic microwave background is 1876 ± 7 km/s, which corresponds to a Hubble distance of 90.2 ± 6.3 Mly (27.67 ± 1.94 Mpc). However, 11 non redshift measurements give a distance of 131.98 ± 21.75 Mly (40.464 ± 6.668 Mpc). The galaxy was discovered in 1871 by French astronomer Alphonse Borrelly using an 18 cm telescope.
NGC 802 is a lenticular galaxy in the constellation Hydrus. It is about 68 million light-years from the Milky Way and has a diameter of about 20,000 light years. NGC 802 was discovered on November 2, 1834 by the British astronomer John Herschel.
