DeLisle Stewart discovered IC 1660 = D.S. 148 on a photographic plate taken on 27 Nov 1900 at Harvard's station in Arequipa, Peru. He noted "eF, vS, R, * N inv in neb, or vF *." His position is accurate. For some reason, this object is included in Sky & Telescope's "Pocket Sky Atlas", although it is much fainter than other unplotted objects. It was described as "probably globular" in the 1935 Harvard Observatory Bulletin 899 based on Bruce plates at Arequipa.

600/800mm - 30" (11/6/10 - Coonabarabran, 264x): fairly faint, fairly small, round, 40" diameter. A single brighter star is resolved along with a couple of extremely faint stars. Several mag 12.5-13.5 stars are within 5', mostly on the south side. IC 1660 is located 8' SSW of mag 9.8 HD 7519, 17' SW of cluster NGC 458 and 22' due east of cluster NGC 411.

Notes by Steve Gottlieb