Asteria — interactive night sky map
Messier 103 is a open cluster in the constellation Cassiopeia with an apparent magnitude of 7.4, spanning about 5 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.