Bibcode
Medeiros, H.; de León, J.; Lazzaro, D.; Popescu, M.; Lorenzi, V.; Pinilla-Alonso, N.; Landsman, Z.; Rizos, J. L.; Morate, D.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 488, Issue 3, p.3866-3875
Fecha de publicación:
9
2019
Número de citas
9
Número de citas referidas
9
Descripción
The main objective of this work is to compositionally analyse the
visible to near-infrared spectra of a total of six V-type candidates
identified using the MOVIS (Y-J) versus (J-Ks) colour-colour plot and
located outside the Vesta collisional family. We obtained visible and
near-infrared spectra of these asteroids using the 2.54m Isaac Newton
Telescope, the 2.5m Nordic Optical Telescope, and the 3.58m Telescopio
Nazionale Galileo, all located at the El Roque de Los Muchachos
Observatory (La Palma, Spain), as well as the 3.0m NASA Infrared
Telescope Facility, located at the Mauna Kea Observatory in Hawaii. We
computed several diagnostic spectral parameters (slopes, band centres,
band depths, band area ratio, or BAR) and compared them to the ones
known for HED meteorites and (4) Vesta. The taxonomic classification
confirmed five out of the six candidates as V-types, leading to an
identification success rate about 83 per cent. In general, the spectral
parameters obtained for the five V-types are in good agreement with
those of HED meteorites and (4) Vesta. The exception is asteroid (2452)
Lyot, a V-type in the outer belt, located very close to (1459) Magnya,
but showing distinct [Wo] and [Fs] molar contents both from Magnya and
Vesta, pointing toward a diogenitic compostion. We also studied the
dependency of the BAR parameter on the way it is computed (removing or
not the continuum), the spectral slope, and the last point used to
delimit the right wing of the absorption band at 2 μm.
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