Albert Marth discovered NGC 6308 = m 332, along with NGC 6314 and 6315, on 6 Jun 1863 and noted "vF, S, R, sbM." These were the first three galaxies he discovered with William Lassell's 48-inch on Malta.

400/500mm - 17.5" fairly faint, fairly small, slightly elongated ~N-S, diffuse. A mag 15 star is at the north edge 0.7' from center. First and largest of three with NGC 6314 11.2' SE.

Notes by Steve Gottlieb