Ground-based observations of inner main belt V-type asteroids, in support to the DAWN mission

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Scientific paper

New near-infrared reflectance spectra of 18 V-type candidate asteroids have been obtained at the 3.6 m Telescopio Nazionale Galileo covering the spectral range 0.7 to 2.5 μm. The observed objects were selected from diverse datasets of putative V-type asteroids in order to characterize them, and hence better understand their relationship with (4) Vesta. Most of the selected asteroids do not belong to the Vesta classical family, according to dynamical considerations. Spectral parameters from NIR spectra have been derived to infer mineralogical information of the observed asteroids. All the spectra of the asteroids here analyzed show two prominent absorption features at 1 and 2 μm that are typical of V-class objects, confirming their first classification as V-types, and indicating that the methods based on photometric surveys to infer the basaltic asteroids distribution seem to be quite robust. The V-type asteroids here examined show a larger variability of band parameters with respect to HEDs values, as for (4) Vesta.

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