William Herschel discovered NGC 4339 = H II-143 = h1222, along with NGC 4326 and 4333, on 13 Apr 1784 (sweep 191). JH logged (sweep 254) "B; R; pL; psbM; 30"; the third in a triangle."

400/500mm - 17.5" (3/28/87): fairly bright, fairly small, round, small very bright core. Forms a trio with NGC 4333 4' SW and NGC 4326 6' WSW.

Notes by Steve Gottlieb