October / November (Usually visible from northern latitudes)
Notes
This open cluster has two stars shining more brightly than the rest, giving the impression of a pair of 'eyes' that leads to the common name of the 'Owl Cluster'. These two stars are Phi Cassiopeiae and HD 7209, though there is still some question as to whether Phi Cassiopeiae actually belongs to the cluster, or simply falls in its foreground as seen from Earth.