Édouard Stephan discovered NGC 666 = St XIII-13 on 22 Nov 1883 with the 31" reflector at the Marseille Observatory. His position is accurate and his description "very small star in an extremely small and faint nebula" applies to the stellar nucleus and small halo.

400/500mm - 17.5" (11/27/92): fairly faint, very small, round, stellar nucleus. Almost collinear with a mag 12.5 star 2' NNE and a mag 13 star 3' NNE.

Notes by Steve Gottlieb