The companion, PGC 6014, appeared faint, very small, round, 12" diameter. It was easily seen close east of NGC 646 [0.9' separation between centers]. The pair is located 8' NE of mag 9.5 HD 10080.

John Herschel discovered NGC 646 = h2434 on 2 Nov 1834 and logged "vF, irregularly round, vglbM." His position matches this double system.

600/800mm - 25" (10/16/17 - OzSky): this interacting double system (NGC 646 + PGC 6014) was resolved at 244x, though more cleanly viewed at 397x. (NGC 646, the brighter and larger western galaxy, appeared fairly faint, fairly small, roundish, 24" diameter, weak concentration. I didn't notice the very low surface brightness arms that are tidally stretched (one extends to to PGC 6014).

Notes by Steve Gottlieb