Lewis Swift discovered IC 313 = Sw. VIII-33, along with IC 316, on 14 Sep 1888 and recorded "eeF; vS; R; e close D * v near south."

400/500mm - 17.5" (1/7/89): very faint, very small, almost round. A mag 14 star (close double) is off the southeast edge 30" from center. Forms a pair with IC 316 4.5' NE within AGC 426.

600/800mm - 24" (2/7/16): fairly faint, small, round, 24" diameter, slightly brighter nucleus. A double star 14.5/14.5 (separation ~6") is 30" SE, just off the southeast edge. A superimposed star barely south of the nucleus was not noticed. IC 316 lies 4.6' NE and a mag 10.5 star is 2.5' N.

Notes by Steve Gottlieb