Bibcode
Popescu, M.; Licandro, J.; Carvano, J. M.; Stoicescu, R.; de León, J.; Morate, D.; Boacă, I. L.; Cristescu, C. P.
Bibliographical reference
Astronomy and Astrophysics, Volume 617, id.A12, 16 pp.
Advertised on:
9
2018
Journal
Citations
47
Refereed citations
44
Description
Context. The MOVIS catalog contains the largest set of near-infrared
(NIR) colors for solar system objects. These data were obtained from the
observations performed by VISTA-VHS survey using the Y, J, H, and Ks
filters. The taxonomic classification of objects in this catalog allows
us to obtain large-scale distributions for the asteroidal population, to
study faint objects, and to select targets for detailed spectral
investigations. Aims: We aim to provide a taxonomic
classification for asteroids observed by VISTA-VHS survey. We derive a
method for assigning a compositional type to an object based on its (Y -
J), (J - Ks), and (H - Ks) colors. Methods: We present a
taxonomic classification for 18 265 asteroids from the MOVIS catalog,
using a probabilistic method and the k-nearest neighbors algorithm.
Because our taxonomy is based only on NIR colors, several classes from
Bus-DeMeo were clustered into groups and a slightly different notation
was used: i.e., the superscript indicates that the classification was
obtained based on the NIR colors and the subscript indicates possible
misidentifications with other types. Our results are compared with the
information provided by the Sloan Digital Sky Survey (SDSS) and
Wide-field Infrared Survey Explorer (WISE). Results: The two
algorithms used in this study give a taxonomic type for all objects
having at least (Y - J) and (J - Ks) observed colors. A final
classification is reported for a set of 6496 asteroids based on the
criteria that kNN and probabilistic algorithms gave the same result, and
the color errors are within the limits (Y - J)err ≤ 0.118
and (J - Ks)err ≤ 0.136. This set includes 144 bodies
classified as Bkni, 613 as Cni, 197 as
Cgxni, 91 as Xtni, 440 as
Dsni, 665 as Klni, 233 as
Adni, 3315 as Sni, and 798 as
Vni. We report the albedo distribution for each taxonomic
group and we compute new median values for the main types. We found that
V-type and A-type candidates have identical size frequency
distributions, but V types are five times more common than A types.
Several particular cases, such as the A-type asteroid (11616) 1996 BQ2
and the S-type (3675) Kematsch, both in the Cybele population, are
discussed.
Classification table for 18 265 asteroids is only available at the CDS
via anonymous ftp to http://cdsarc.u-strasbg.fr (http://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/617/A12
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