NGC 4015 is a

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 ...

in the

Coma Berenices Coma Berenices is an ancient asterism in the northern sky, which has been defined as one of the 88 modern constellations. It is in the direction of the fourth galactic quadrant, between Leo and Boötes, and it is visible in both hemisphere ...

. It is located between 215 and 220 million light years away. Its visual magnitude is 13.15. It was first discovered by Danish astronomer

John Dreyer John Dreyer may refer to: *John Louis Emil Dreyer, Danish-Irish astronomer *John Dreyer (footballer) John Brian Dreyer (born 11 June 1963) is an English former professional footballer and manager who played in defence and midfield. He is curren ...

on 26 April 1878, and he described it as a "faint object, very small and with a much brighter middle." He also described it in his notes on the accompanying galaxy, PGC 37703, which he described as "a tail north of the nucleus". Together, NGC 4015 and PGC 37703 comprise Arp 138 in the

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 ...

Sources

{{Galaxy-stub Lenticular galaxies 4015 Coma Berenices