John Herschel discovered NGC 5153 = h3509 on 5 May 1834 and recorded "pF; S; the following of two equal neb [with NGC 5152]."
300/350mm - 13.1" (5/26/84): very faint, small, round. Forms very close pair with NGC 5152 0.9' W and NGC 5150 is 5.2' NW.
Notes by Steve Gottlieb