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Paper: The Thermal Infrared Spectra of Comets Hale-Bopp and 103P/Hartley 2 Observed with the Infrared Space Observatory
Volume: 196, Thermal Emission Spectroscopy and Analysis of Dust, Disks, and Regoliths
Page: 109
Authors: Crovisier, J.; Brooke, T. Y.; Leech, K.; Bockelée-Morvan, D.; Lellouch, E.; Hanner, M. S.; Altieri, B.; Keller, H. U.; Lim, T.; Encrenaz, Salama; Griffin, M.; de Graauw, T.; van Dishoeck, E.; Knacke, R. F.
Abstract: The Infrared Space Observatory (ISO) offered us the opportunity to observe celestial bodies from 2.4 to 196 μm, which is of particular interest for comets. We present here spectroscopic observations with ISO of comets C/1995 O1 (Hale-Bopp) and 103P/Hartley 2. The thermal infrared region of the spectra shows specifically the signatures of crystalline, Mg-rich olivine (forsterite), but also signs of the presence of crystalline pyroxenes and amorphous silicates, as well as continuum-like emission. A quantitative evaluation of the contributions of these various components is given for comet Hale-Bopp.
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