Otto Struve found NGC 3910 on 3 Mar 1869 with the 15-inch refractor at Pulkovo Observatory in St. Petersburg and recorded "a round nebula, 20" diameter, strong concentratin to center. A star 10-11 is 48" north." He found this object (along with 7 others) while searching for Comet Winnecke (7P/Pons-Winnecke) in Mar-Apr 1869.

Although Struve is credited with the discovery in the GC Supplement and the NGC, WH made the original discovery on 27 Dec 1786 (sweep 671) though was not convinced it was a nebula. He recorded "eF, eS. Suspected, but may be a deception." His position (CH's reduction) is less than 3' southwest of NGC 3910. He never went back in a later sweep to confirm this object and the discovery was not published in his catalogues or assigned an internal discovery number.

400/500mm - 17.5" (4/7/89): fairly faint, small, oval ~NW-SE, small bright core, stellar nucleus. A mag 12.5 star is 30" off the NW edge and 1.0' NNW of center.

Notes by Steve Gottlieb