William Herschel discovered NGC 5154 = H III-405 = h1605, along with NGC 5149, on 1 May 1785 (sweep 405). JH made two observations and recorded (sweep 331) "eF; L; R; it is 45° nf III. 404 NGC 5149]."

400/500mm - 17.5" (5/15/99): faint, fairly small, round. Appears as a low surface brightness glow ~45" in diameter with very weak concentration. Forms a pair with NGC 5149 5' SW. A mag 11 star lies 3.7' ENE.

Notes by Steve Gottlieb