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The INT Photometric H$\alpha$ Survey (IPHAS) has provided us with a number ofnew-emission line sources, among which planetary nebulae (PNe) constitute animportant fraction. Here we present a detailed analysis of the IPHAS nebulaSab\,19 (IPHASX\,J055242.8+262116) based on radio, infrared, and optical imagesand intermediate- and high-dispersion longslit spectra. Sab\,19 consists of aroundish 0.10 pc in radius double-shell nebula surrounded by a much larger 2.8pc in radius external shell with a prominent H-shaped filament. We confirm thenature of the main nebula as a PN whose sub-solar N/O ratio abundances, lowionized mass, peculiar radial velocity, and low-mass central star allow us tocatalog it as a type III PN. Apparently, the progenitor star of Sab\,19 becamea PN when crossing the Perseus Arm during a brief visit of a few Myr. Thehigher N/O ratio and velocity shift $\simeq$40 \kms\ of the external shell withrespect to the main nebula and its large ionized mass suggest that it is nottruly associated with Sab\,19, but it is rather dominated by a Str\"omgren zonein the interstellar medium ionized by the PN central star.

Detailed Studies of IPHAS sources. II. Sab 19, a true planetary nebula and its mimic crossing the Perseus Arm