Asteria — interactive night sky map
NGC 663 is a open cluster in the constellation Cassiopeia with an apparent magnitude of 7.1, spanning about 6 arcminutes. It is within reach of binoculars or a small telescope.
It is best placed in the evening sky around October. It is visible from the whole northern hemisphere and from southern latitudes down to about 29°S. It is circumpolar (never sets) north of latitude 29°N.