Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.435...31m&link_type=abstract
WORKSHOP ON ISO POLARISATION OBSERVATIONS. Eds. R.J. Laureijs & R. Siebenmorgen. ESA-SP 435, p. 31
Astronomy and Astrophysics
Astronomy
1
Iso, Infrared Astronomy, Asteroids, Polarimetry, Regoliths, Asteroid Surfaces
Scientific paper
The asteroids (6) Hebe and (9) Metis were observed at λ=25 μm with ISOPHOT onboard the Infrared Space Observatory (ISO). The on- and off-source measurements have been analysed with a special data reduction method to achieve reliable photometric and polarimetric results. In parallel a previously established thermophysical model has been extended to cover also polarimetric aspects. The model absolute fluxes are in good agreement with the photometric results. Although no linear polarization was detected, the upper limits together with the extended model enable us to put useful constraints on the regolith properties of the target asteroids. The derived detection limits are compared to model polarization, by spanning a range in surface roughness, refractive index, and thermal inertia parameter space. The Metis observations favor a low refractive index and high surface roughness, but the Hebe observations are inconclusive since they coincided with a minimum in the polarization curve.
Klaas Ulrich
Lagerros Johan S. V.
Müller Thomas G.
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