Heinrich d'Arrest discovered NGC 4615 = Sf 12, along with NGC 4613 and NGC 4614, on 9 May 1864 with the 11-inch refractor at Copenhagen. His position (measured on two nights) matches UGC 7852. Truman Safford independently discovered NGC 4615, as well as NGC 4614, on 11 May 1866.

400/500mm - 17.5" (4/6/91): faint, fairly small, elongated 3:2 NW-SE, even surface brightness. Third and largest of three with NGC 4614 2.5' SW and NGC 4613 2' WNW.

600/800mm - 24" (6/1/13): largest in a small triplet with NGC 4613 2.1' NW and NGC 4614 2.2' SW. Fairly faint to moderately bright, very elongated 3:1 NW-SE, 1.5'x0.5', weak concentration. This is a nice little trio forming a small isosceles triangle with NGC 4615 at the eastern vertex. NGC 4615 is in Arp's category of "Integral Sign" galaxies.

Notes by Steve Gottlieb