Determination of Planetary Nebulae angular diameters from radio
  continuum Spectral Energy Distribution modeling
  Powerful new, high resolution, high sensitivity, multi-frequency, wide-field
radio surveys such as the Australian Square Kilometre Array Pathfinder (ASKAP)
Evolutionary Map of the Universe (EMU) are emerging. They will offer fresh
opportunities to undertake new determinations of useful parameters for various
kinds of extended astrophysical phenomena. Here, we consider specific
application to angular size determinations of Planetary Nebulae (PNe) via a new
radio continuum Spectral Energy Distribution (SED) fitting technique. We show
that robust determinations of angular size can be obtained, comparable to the
best optical and radio observations but with the potential for consistent
application across the population. This includes unresolved and/or heavily
obscured PNe that are extremely faint or even non-detectable in the optical.
