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We report H$\alpha$ filter photometry for 197 northern hemisphere planetarynebulae (PNe) obtained using imaging data from the IPHAS survey. H$\alpha$+[NII] fluxes were measured for 46 confirmed or possible PNe discovered by theIPHAS survey and for 151 previously catalogued PNe that fell within the area ofthe northern Galactic Plane surveyed by IPHAS. After correcting for [N II]emission admitted by the IPHAS H$\alpha$ filter, the resulting H$\alpha$ fluxeswere combined with published radio free-free fluxes and H$\beta$ fluxes, inorder to estimate mean optical extinctions to 143 PNe using ratios involvingtheir integrated Balmer line fluxes and their extinction-free radio fluxes.Distances to the PNe were then estimated using three different 3D interstellardust extinction mapping methods, including the IPHAS-based H-MEAD algorithm ofSale (2014). These methods were used to plot dust extinction versus distancerelationships for the lines of sight to the PNe; the intercepts with thederived dust optical extinctions allowed distances to the PNe to be inferred.For 17 of the PNe in our sample reliable Gaia DR2 distances were available andthese have been compared with the distances derived using three differentextinction mapping algorithms as well as with distances from the nebular radiusvs. H$\alpha$ surface brightness relation of Frew et al. (2016). That relationand the H-MEAD extinction mapping algorithm yielded the closest agreement withthe Gaia DR2 distances.

H$\alpha$ fluxes and extinction distances for planetary nebulae in the IPHAS survey of the Northern Galactic Plane