NGC 3540 NGC 3205
Uma
☀13.3mag
Ø 78'' / 48''

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William Herschel discovered NGC 3207 = H II-722 = h700 on 3 Feb 1788 (sweep 804) and logged "F, vS, stellar." On 12 Apr 1830 (sweep 248) John Herschel recorded, "vF; R; vgbM; 30"; the last of 3 in a triangle [with NGC 3202 and 3205]."

400/500mm - 17.5" (4/9/94): fairly faint, small, almost round, even concentration down to very small core. A mag 13.5 star is 2.0' S. Third of three in a close trio with NGC 3205 2.1' WSW and NGC 3202 5.7' WNW.

Notes by Steve Gottlieb