308 Polyxo: ISO-SWS spectrum up to 26 micron

Elisabetta Dotto (1) , Maria Antonella Barucci (2, 3) , John R. Brucato (4) , Thomas G. Müller (5) , Jorge M. Carvano (2, 3, 6)

1 INAF-OAR - INAF-Osservatorio Astronomico di Roma
2 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
3 Pôle Planétologie du LESIA
4 INAF-OAC - INAF-Osservatorio Astronomico di Capodimonte
5 MPE - Max-Planck-Institut für Extraterrestriche Physik
6 Observatório Nacional/MCTI

Infrared spectroscopic observations of the asteroid 308 Polyxo have been carried out by the Infrared Space Observatory (ISO) with the Short Wavelength Spectrometer (SWS) in the spectral region between 7 and 26 mum. The Standard Thermal Model and the Thermophysical Model have been applied to the obtained data in order to model the thermal continuum. Sub-solar and black-body temperatures also have been derived. The obtained spectrum has been compared with laboratory spectra of minerals and meteorites available in the literature. Moreover, we performed new measurements to obtain infrared spectra of the Tagish Lake meteorite, recognized as the best analog of primitive D-type asteroids. A tentative spectral similarity with the Ornans meteorite is suggested, while we cannot confirm, in the considered wavelength range, the analogy with the Tagish Lake meteorite.

Domaines: Astrophysique [astro-ph]

Elisabetta Dotto, Maria Antonella Barucci, John R. Brucato, Thomas G. Müller, Jorge M. Carvano. 308 Polyxo: ISO-SWS spectrum up to 26 micron. Astronomy and Astrophysics - A&A, 2004, 427, pp.1081-1084. ⟨10.1051/0004-6361:20041638⟩. ⟨hal-03733405⟩