Seyfert's sextet

Seyfert's Sextet, a group of galaxies, is also named after him.

Seyfert's Sextet is a group of galaxies about 190 million light-years away in the constellation Serpens Caput.

NGC 6027 is a Lenticular galaxy that is the brightest member of Seyfert's Sextet, a compact group of galaxies.

ASAHI Net Free Address Service: Seyfert's Sextet (Galaxy Group in Serpens)

Seyfert's Sextet is a group of six galaxies, four of which are interacting gravitationally and two of which simply appear to be a part of the group despite their greater distance.

The gravitationally bound cluster lies at a distance of 190 million light-years from Earth (redshift 0.0145) and is approximately 100,000 light-years across, making Seyfert's Sextet one of the densest galaxy clusters known.