John Herschel discovered NGC 5121 = h3498 on 26 Jun 1834 and recorded "B; R: psvmbM; 30"; r; probably a dim seen globular cluster."
300/350mm - 13.1" (3/17/86): fairly faint, fairly small, slightly elongated ~E-W, brighter core. Located 21' N of mag 7.4 SAO 204431.
Notes by Steve Gottlieb