Lewis Swift discovered IC 1045 = Sw. VIII-82 on 1 Sep 1888 and reported "eeeF; pS; R; nearly bet. 2 st.; forms triangle with 2 st; eee diff." There is nothing at his position, but 7' WNW is NGC 5731 and Harold Corwin originally considered this galaxy as a candidate for IC 1045. This identification implies Swift didn't notice NGC 5730, which is in the same field and equally as bright.

But in August 2017, Harold Corwin followed up on my suggestion that Swift made a 10 minute error in RA in the position of IC 895 and found that the same 10 minute correction applied to IC 1045 as well as IC 1028 (both discovered on the same night), resulted in IC 1045 = UGC 9559. No modern catalogues (yet) make this identification. Courtney Seligman additionally found that IC 511, the 4th object discovered that night by Swift, shares the same 10 minute error!

400/500mm - 17.5" (6/27/98): faint, moderately large, very elongated NW-SE, 1.0'x0.25', weakly concentrated. A mag 13 star lies 1.5' NW of center. Forms a close pair of edge-ons with NGC 5730 3' SW.

600/800mm - 24" (7/1/19): at 375x; fairly faint, moderately large, elongated 5:2 NW-SE, ~1.0'x0.4', bright elongated core. CGCG 220-059, just 1.8' NNE, appeared faint, small, round, 15" diameter. Both galaxies are within the outline of a triangle of mag 10/11/12 stars.

UGC 9542, located 25' SW, appeared fairly faint, moderately large, very thin edge-on, 1.0'x0.25', fairly low nearly even surface brightness.

24" (6/3/19): at 322x; UGC 9559 (recently identified as IC 1045) appeared fairly faint, fairly small, elongated 2:1 or 5:2 NW-SE, ~40"x16", brighter core. At the center of a triangle with a mag 9.7 star 5.9' WSW, a mag 11 star 4' SE and a mag 12 star 3.6' NNE.

Forms a physical pair of Markarian galaxies with CGCG 220-059 1.8' NNE. The companion was very faint and small, round, 12"-15" diameter.

NED equates IC 1045 with NGC 5731, described below.

Notes by Steve Gottlieb