I performed follow-up measurements of this object, while it was still on the PCCP webpage. Stacking of 10 unfiltered exposures, 60 seconds each, obtained remotely on 2018, July 15.7 from Q62 (iTelescope network) through a 0.43-m f/6.8 astrograph + CCD, shows that this object is a comet with a diffuse coma about 15 arcsec in diameter.
M.P.E.C. 2018-O01 assigns the following preliminary parabolic orbital elements to comet C/2018 N2: T 2019 Oct. 4.09; e= 1.0; Peri. = 23.85; q = 3.00; Incl.= 78.31
This is the second comet discovered by ASASSN Survey (more info about their first comet are here).
by Ernesto Guido