NGC 147 is a dwarf spheroidal galaxy about
2.58 Mly away in the constellation Cassiopeia. NGC 147 is a
member of the Local group of galaxies and a satellite galaxy of
the Andromeda Galaxy (M31). It forms a physical pair with the
nearby galaxy NGC 185, another remote satellite of M31. It was
discovered by John Herschel in September 1829. Visually it is
both fainter and slightly larger than NGC 185 (and therefore has
a considerably lower surface brightness).