Absolute spectral modelling of asteroid (4) Vesta

被引：4
作者：
Martikainen, Julia [1 ]
Penttila, Antti [1 ]
Gritsevich, Maria [1 ,2 ]
Videen, Gorden [3 ]
Muinonen, Karri [1 ,4 ]
机构：
[1] Univ Helsinki, Dept Phys, POB 64, FI-00014 Helsinki, Finland
[2] Ural Fed Univ, Inst Phys & Technol, Mira Str 19, Ekaterinburg 620002, Russia
[3] Space Sci Inst, 4750 Walnut St,Suite 205, Boulder, CO 80301 USA
[4] Finnish Geospatial Res Inst FGI, POB 84, FI-00521 Helsinki, Finland
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2019年 / 483卷 / 02期
关键词：
scattering; methods: numerical; techniques: spectroscopic; minor planets; asteroids:; individual:; Vesta; DISCRETE RANDOM-MEDIA; MAIN-BELT; DAWN; SPECTROSCOPY; METEORITES; PHOTOMETRY; SCATTERING; DIVERSITY; REGOLITH;
D O I：
10.1093/mnras/sty3164
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 <25 mu m in size.
引用
收藏
页码：1952 / 1956
页数：5
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