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We provide mid- and far-infrared photometry of 857 Galactic planetary nebulae(PNe) using data derived from the AKARI All-Sky Survey. These include fluxes at9 and 18 {\mu}m obtained with the Infrared Camera (IRC), and at 65, 90, 140 and160 {\mu}m using the far-Infrared Surveyor (FIS). It is noted that the IRluminosities of the youngest PNe are comparable to the total luminosities ofthe central stars, and subsequently decline to ~ 5102 L where D > 0.08 pc. Thisis consistent with an evolution of PNe dust opacities, and appreciableabsorption in young and proto-PNe. We also note that whilst there is littleevidence for the evolution in IR/radio flux ratios suggested by previousauthors. The fall-off in dust temperatures is similar to that determined inprevious studies, whilst levels of Ly heating are < 0.5 of the total energybudget of the grains. There appears to be an evolution in the infrared excess(IRE) as nebulae expand, with the largest values occurring in the most compactPNe.

Mid and Far Infrared Photometry of Galactic Planetary Nebulae with the AKARI All Sky Survey