Albert Marth discovered NGC 6658 = m 382, along with NGC 6661, on 6 Jun 1864 and noted "F, vS, lE."
400/500mm - 17.5" (7/1/89): faint, small, edge-on N-S, small very bright core with very faint extensions. A mag 13 star is just off the east side of the north edge 40" from center. Pair with NGC 6661 9.7' ENE.
Notes by Steve Gottlieb