William Herschel discovered NGC 1750 = H VIII-43, along with NGC 1758, on 26 Dec 1785 (sweep 493) and described a "A cl of very coarsely scattered L *, joining to the following [VII 21 = NGC 1758] I believe." His position indicates NGC 1750 is the large, elongated group of stars centered at 05 03 55 +23 39.5, just southwest of NGC 1758. Although NGC 1750 is generally taken as a subgroup (on the SE side) of much larger NGC 1746, Corwin suggests that Heinrich d'Arrest's NGC 1746, which was found while searching for NGC 1750, is actually a duplicate of NGC 1750. Karl Reinmuth, in his 1926 survey based on Heidelberg plates, states that NGC 1750 is the central group in a very large cluster also containing NGC 1746 and NGC 1758.

300/350mm - 13" group of fainter stars, just SE of open cluster NGC 1746.

400/500mm - 17.5" (1/19/91): prominent subgroup of two dozen stars within NGC 1746 on the SW side. Fairly large, oval outline oriented NW-SE, void in the center. Includes a nice double star 9.1/9.1 at 20". NGC 1758 is close NE (though probably physically unrelated ). Modern catalogues apply NGC 1746 to the entire cluster (see description), although NGC 1750 (from William Herschel) and NGC 1746 (from d'Arrest) are either identical or just parts of the same cluster.

Notes by Steve Gottlieb