Physics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000esasp.456...33m&link_type=abstract
ISO beyond the peaks: The 2nd ISO workshop on analytical spectroscopy. Eds. A. Salama, M.F.Kessler, K. Leech & B. Schulz. ESA-SP
Physics
2
Asteroids: General, Asteroid: Individual: 1 Ceres, 2 Pallas, 3 Juno, 4 Vesta, 52 Europa, Iso, Infrared: Solar System, Spectroscopy
Scientific paper
We present PHT-S observations of 5 bright main-belt asteroids. Detailed data analysis and careful modeling of the thermal emission allowed us for the first time to study the physical and compositional properties for 1 Ceres, 2 Pallas, 3 Juno, 4 Vesta, and 52 Europa. In order to arrive at reliable spectroscopic results we had to perform a dynamic calibration method to the PHT-S data. Each detector pixel has been calibrated individually by two calibrators, which have been carefully selected to exclude low level features produced by the fundamental SiO absorption in late type standard stars. All resulting asteroid spectra show a strong emission band centered at about 10 μ m, suggesting the presence of silicates on the surface of these objects. The modeling of the shape of the thermal emission between 6 and 12 μ m with a thermophysical model revealed a variety of different regolith structures described by beaming parameters ρ and f. We discuss the influence of these parameters under the constrains of the limited PHT-S wavelength range. We also present a comparison of PHT-S data with observations taken by the Kuiper Airborne Observatory and ISOSWS. In the appendix we demonstrate the influence of late-type stars in the PHT-S calibration.
Barucci Andrea
Dotto Elisabetta
Müller Thomas G.
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