Lp

Well Observed = Photometry From at least >5-20 fim, or 8-13 ¡im Using Spectroscopy

Large Particle Dominated = Silicate Emission/Continuum < 10% and/or T/T55 < 1.10

Small Particle Dominated = Silicate Emission/Continuum > 10% and/or T/T55 >1.10

SP = Short period comet; LP = Long period comet; H = Halley Family, New = Dynamically New Comet

P = Photometric Observation, S = Spectroscopic Observation, I = Imaging Observation, § = q > 5 AU

Dynamical type - From [18]

the same distinction in the emitted dust between the SP + New and the LP comets. The Halley family comets seem to be split in their behavior.

There is no obvious trend in i, P, or e in Table 2. The only obvious trend in q is that all comets with q > 5 AU have small particle dominated emission. Using estimated nuclear radii from the literature [20, 13], we see no obvious trend with RN. E.g., LP comet Hale-Bopp, SP comets Chiron and SW-1 are all thought to be large, with varying levels of activity, while LP comets Levy and Hyakutake were as small as the average SP comet like Encke or Tempel-Tuttle. Thus any variability of the emitted dust due to nuclear structure differences dependent on size - like degree of melting and internal differentiation, and degree of heterogeneity -appear to be small.

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