Albert Marth discovered NGC 6203 = m 315, along with NGC 6201, on 6 Jun 1864 and noted "eF, vS." His position is fairly accurate. Bigourdan measured a very accurate micrometric position on 14 May 1887.

400/500mm - 17.5" very faint, very small, round. A mag 14.5 star is just 27" NNE of center. Forms a pair with NGC 6201 about 3' SW.

Notes by Steve Gottlieb