John Herschel discovered NGC 1591 = h2644 on 6 Nov 1834 and recorded "pF; S; R; glbM; 15" dia." His position matches ESO 484-025 = PGC 15276. His RA in sweep 643 is 10 sec too small, though he noted the "time of transit somewhat confusedly stated in MS, which renders a mistake of 10s not improbable." It's a bit surprising he missed ESO 484-26 and ESO 484-28 on all three sweeps.

400/500mm - 17.5" (11/10/96): fairly faint, fairly small, elongated 3:2 SSW-NNE, very weak concentration. A mag 13 star lies 1.2' due west. Brightest and largest of three with ESO 484-G26 4.4' SE and ESO 484-28 10' SE.

Notes by Steve Gottlieb