This galactic nebula was misclassified as a galaxy in the UGC, and a possible planetary in the ESO-Strausberg Catalogue of Galactic Planetary Nebula, although it is situated just 1.5 degrees from the galactic plane!

Identified as a HII or reflection nebula by Weinberger, et al in 1995A&AS, 110, 269. Still, in 2019 UGC 3490 is classified as a PN in HyperLEDA and a galaxy in SIMBAD!

400/500mm - 17.5" (2/2/02): at 280x, a faint, very small glow was visible, ~15-20" diameter with a very faint, stellar or quasi-stellar core at moments. Forms the SE vertex of a small isosceles triangle with two mag 12.5 stars 2.5' NNW and a similar distance WNW.

Notes by Steve Gottlieb