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D.J. Osip (MIT), R.G. Walker, D. Lien (Vanguard Research Inc.), S.M. Lederer (University of Florida), E. Gruen, S.B. Peschke (MPIK)
We report on simultaneous multi-wavelength observations of Comet Hale-Bopp obtained from ground based telescopes and from two spacecraft, the Infrared Space Observatory (ISO) and the Midcourse Space Experiment (MSX). On October 6-10 UT, 1996, we obtained 1-20 micron imaging and spectrophotometry using the BOLO and NSFCAM instruments at the NASA 3.0 meter Infrared Telescope Facility in Hawaii. On October 8-11 UT, 1996, we obtained visible continuum imaging at the Lowell Observatory 1.1 meter Hall telescope, using a TI 800x800 CCD camera and narrowband filters at 4845 and 6840 angstroms. Spectrophotometry spanning 3-160 microns was obtained with the ISOPHOT instrument on October 7 UT, 1996. Finally, thermal images were obtained in 4 wavebands from 6-25 microns using the SPIRIT III telescope aboard MSX also on October 7 UT, 1996. Here, we present a combined analysis of the ground based, ISO, and MSX data and begin to constrain models of the composition and abundance of the coma dust particles.