Lewis Swift discovered NGC 5099 = Sw. III-69 on 3 Jun 1886 and logged "eF; eS; R." His position is 2.7' south of PGC 46627, a very similar error as NGC 5097 = Sw. III-68, observed the same night.

400/500mm - 17.5" (4/21/01): extremely faint, small, round, 20" diameter. Located 12' NW of NGC 5105 and symmetrically placed on opposite side of a 1' pair of mag 13 stars.

Notes by Steve Gottlieb