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E. Dotto, M.A. Barucci (DESPA - Observatoire de Paris, France), J. Crovisier (ARPEGES - Observatoire de Paris, France), A. Doressoundiram (Osservatorio Astronomico di Torino, Italy), Th. Encrenaz (DESPA - Observatoire de Paris, France), M. Fulchignoni (Universite ``Denis Diderot'' - Paris VII, France), R.F. Knacke (Penn. State University, Erie, Penn., USA), E. Lellouch (DESPA - Observatoire de Paris, France), P. Morris (ISO Science Operations Center, ESA, Vilspa, Spain), T.G. Mueller (MPIA, Heidelberg, Germany / ISO SOC, Astrophysics Division of ESA, Villafranca, Spain), T. Owen (Institute for Astronomy, Univ. of Hawaii, Honolulu, USA)
Observations of asteroids have been performed by ISO satellite with several instruments (PHT-P, PHT-S and SWS). The aim of these observations was to investigate the asteroid physical and compositional properties. Sixteen asteroids have been observed by PHT-P and PHT-S: with PHT-P we obtained the observations at filters 3.6, 10, 11.5, 25, and 60 micron, while with PHT-S we obtained simultaneously the 2.5-5 and 6-12 micron spectral ranges with resolution of 85 and 95, respectively. The 6-12 micron part of the spectrum has been fitted with a black-body curve and the temperature has been computed for all the observed asteroids. A thermal model has been applied to these infrared observations to determine the diameter and the albedo.
Four asteroids (10 Hygiea, 114 Kassandra, 308 Polyxo and 624 Hektor) have been also observed with SWS, and high resolution spectra have been obtained between 5.3 and 45 micron.
The obtained results and spectral analysis will be presented and discussed.