Absolute spectral modelling of asteroid (4) Vesta

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http://hdl.handle.net/10138/300975

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Martikainen , J , Penttilä , A , Gritsevich , M , Videen , G & Muinonen , K O 2019 , ' Absolute spectral modelling of asteroid (4) Vesta ' , Monthly Notices of the Royal Astronomical Society , vol. 483 , no. 2 , pp. 1952–1956 . https://doi.org/10.1093/mnras/sty3164

Title: Absolute spectral modelling of asteroid (4) Vesta
Author: Martikainen, Julia; Penttilä, Antti; Gritsevich, M.; Videen, Gorden; Muinonen, Karri Olavi
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2019-02
Language: eng
Number of pages: 5
Belongs to series: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
URI: http://hdl.handle.net/10138/300975
Abstract: We present a new physics-based approach to model the absolute reflectance spectra of asteroid (4) Vesta. The spectral models are derived by utilizing a ray-optics code that simulates light scattering by particles large compared to the wavelength of the incident light. In the light of the spectral data obtained by the Dawn spacecraft, we use howardite powder to model Vesta's surface regolith and its particle size distribution for 10-200 mu m sized particles. Our results show that the modelled spectrum mimics well the observations. The best match was found using a power-law particle size distribution with an index 3.2. This suggests that Vesta's regolith is dominated by howardite particles
Subject: DAWN
DISCRETE RANDOM-MEDIA
DIVERSITY
MAIN-BELT
METEORITES
PHOTOMETRY
REGOLITH
SCATTERING
SPECTROSCOPY
methods: numerical
minor planets, asteroids: individual: Vesta
scattering
techniques: spectroscopic
115 Astronomy, Space science
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