Lewis Swift discovered NGC 5105 = Sw. III-70, along with NGC 5099, on 3 Jun 1886 and recorded "eF; pS; lE; double star [ADS 12506] in field." His position is just 1' south of PGC 46664.

400/500mm - 17.5" (4/21/01): very faint, moderately large, round, 1.5' diameter, very low surface brightness, weak concentration. In a group with NGC 5099 12' NW and NGC 5111 22' NE.

Notes by Steve Gottlieb