NGC 5508

NGC 5508 is a very large and distant spiral galaxy located in the constellation Boötes. Its velocity relative to the cosmic microwave background is 11,615 ± 15 km/s, which corresponds to a Hubble's law of 171 ± 12 Mpc. It was discovered by French astronomer Édouard Stephan in 1882.
This galaxy is classified by all sources consulted, except Professor Seligman, as a lenticular galaxy. However, the image obtained from the SDSS survey clearly shows that it is a spiral galaxy.
According to the Simbad database, NGC 5508 is a LINER galaxy, i.e. a galaxy whose nucleus exhibits an emission spectrum characterized by broad lines of weakly ionized atoms.
The Hubble distance of neighboring galaxy PGC 50725 is 237.51 ± 16.63 Mpc, well beyond NGC 5508. Although they appear as neighbors on the celestial sphere, they do not form a physical galaxy pair.