Albert Marth discovered NGC 4791 = m 243 on 25 Mar 1865 and noted "eF, vS, lE, vlbM." His position is accurate.
400/500mm - 17.5" (4/4/92): very faint, very small, round, broad concentration. A wide double star is 2' SE (mag 11/12.5 at 39" separation N-S). The double system NGC 4795/NGC 4796 is just 5' E.
Notes by Steve Gottlieb