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Y.R. Fernandez (U.Md.), C.M. Lisse (STScI), M.F. A'Hearn (U.Md.), W.F. Hoffmann (Steward Obs./U.Az.), A. Dayal (IPAC/Caltech), L.K. Deutsch (Boston U.), G.G. Fazio, J.L. Hora (SAO)
We will report on our study of the Jupiter-family comet 21P/Giacobini-Zinner and the old (in the Oort sense) long-period comet LINEAR C/1998 U5 performed during a multi-wavelength observing campaign at KPNO and NASA/IRTF in November 1998. By combining the information from the scattered optical continuum with that from the thermal mid-infrared continuum for each comet, and by performing image processing techniques to account for the comatic flux contribution, we can determine some of the thermophysical properties of these comets' nuclei. Comet LINEAR is one of the few long-period comets whose nucleus has been thus characterized.