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We estimate distances to the spherical planetary nebula Abell 39 and thebipolar planetary nebula NGC 7027 by interpolating from a wide grid ofphotoionization models using the 3-D code, MOCASSIN. We find preliminarydistances of 1.5 kpc and 0.9 kpc respectively, with uncertainties of about 30%.

Photoionization modeling of the Galactic planetary nebulae Abell 39 and NGC 7027