FROM INTERSTELLAR DUST TO COMETS - INFRARED-EMISSION FROM COMET HALE-BOPP (C 1995 O1)/

The 3-20 mu m IR thermal emission spectrum of comet Hale-Bopp (C/1995 01) at a heliocentric distance of r(h) = 1.15 AU has been calculated u sing huffy aggregates of silicate core-organic refractory mantle inter stellar dust as the comet dust model. The principal dust properties, s imilar to those obtained for other comets, provide good fits to the ob servation. Our results are significantly different from the general op inion that Hale-Bopp is rich in submicron grains. The mean grain masse s derived here are 2-3 orders of magnitude higher than those estimated from the empirical superheat method or from the IR emission modeling, both of which use compact silicate/carbon particles. It has been show n that the IR emission alone cannot give a reliable dust production ra te. We have also modeled the crystalline silicate emission spectrum.