Stephane Javelle discovered IC 4239 = J. 3-1246 on 30 Jun 1896 with the 30-inch refractor at the Nice Observatory. UGC has a typo and labels IC 4220 as IC 4239.

400/500mm - 18" (6/21/03): extremely faint, very small, 0.4'x0.3'. Low, even surface brightness, requires averted vision. Located 6.3' ESE of NGC 5131. IC 4240, just 1.2' NNE, was not noticed.

Notes by Steve Gottlieb