William Herschel discovered NGC 3458 = H I-268 on 8 Apr 1793 (sweep 1038) and recorded a "vB, vS, R, stellar nebula." In his 1811 PT paper, he noted "this may be a former planetary in a higher state of condensation.

400/500mm - 17.5" (3/12/88): fairly bright, very small, round, very bright stellar nucleus, very faint small halo. Forms a wide galaxy pair with NGC 3445 13.9' SW in the field.

Notes by Steve Gottlieb