Spectral characterization of V-type asteroids – II. A statistical analysis

In recent years, several small basaltic V-type asteroids have been identified all around the main belt. Most of them are members of the Vesta dynamical family, but an increasingly large number appear to have no link with it. The question that arises is whether all these basaltic objects do indeed co...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2016-01, Vol.455 (3), p.2871-2871
Main Authors: Ieva, S, Dotto, E, Lazzaro, D, Perna, D, Fulvio, D, Fulchignoni, M
Format: Article
Language:English
Subjects:
Asteroids
Astrophysics
Belts
Mineralogy
Origins
Physics
Samples
Spacecraft
Spectra
Spectrum analysis
Statistical analysis
Statistical methods
Vesta asteroid
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Summary:In recent years, several small basaltic V-type asteroids have been identified all around the main belt. Most of them are members of the Vesta dynamical family, but an increasingly large number appear to have no link with it. The question that arises is whether all these basaltic objects do indeed come from Vesta. To find the answer to the above questioning, we decided to perform a statistical analysis of the spectroscopic and mineralogical properties of a large sample of V-types, with the objective to highlight similarities and differences among them, and shed light on their unique, or not, origin. The analysis was performed using 190 visible and near-infrared spectra from the literature for 117 V-type asteroids. The asteroids were grouped according to their dynamical properties and their computed spectral parameters compared. Comparison was also performed with spectral parameters of a sample of HED meteorites and data of the surface of Vesta taken by the VIR instrument on board of the Dawn spacecraft. Our analysis shows that although most of the V-type asteroids in the inner main belt do have a surface composition compatible with an origin from Vesta, this seem not to be the case for V-types in the middle and outer main belt.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stv2510