Submillimeter observations of the asteroid 10 Hygiea

Astronomy and Astrophysics – Astronomy

Scientific paper

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Asteroids, Astronomical Models, Astronomical Spectroscopy, Infrared Astronomy, Submillimeter Waves, Thermal Emission, Near Infrared Radiation, Space Observations (From Earth), Thermal Radiation, Thermodynamic Properties, Asteroids, Hygiea, Observations, Earth-Based Observations, Wavelengths, Infrared, Thermal Properties, Regolith, Models, Optical Properties

Scientific paper

The first successful ground-based observations of any asteroid at submillimeter wavelengths are reported. Observations of the asteroid 10 Hygiea at 370 and 770 micrometers are combined with observations in the near and thermal infrared (2.2, 10.6, and 21 micrometers) to study the thermal properties of Hygiea's regolith. The 'standard' (nonrotating) thermal model is consistent with the entire data set, although a rotating thermophysical model with a 'lunarlike' thermal inertia cannot be ruled out.

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