Asteria — interactive night sky map
Pinwheel Galaxy (Messier 101) is a galaxy in the constellation Ursa Major with an apparent magnitude of 7.9, spanning about 24 arcminutes. It is within reach of binoculars or a small telescope.
It is best placed in the evening sky around April. It is visible from the whole northern hemisphere and from southern latitudes down to about 36°S. It is circumpolar (never sets) north of latitude 36°N.