John Herschel discovered NGC 2133 = h2989 (along with NGC 2134 = h2991) on 24 Nov 1834 and recorded "pB; pL; R; gbM; 60"." His position is accurate.

600/800mm - 25" (10/10/15 - OzSky): moderately bright and large, round, 45" diameter, relatively large brighter core, unresolved. This cluster is a smaller and paler version of NGC 2134, which lies 5.2' NNE. S-L 747 is 6.5' WNW.

Notes by Steve Gottlieb