J/A+A/617/A12 Taxonomic classification of asteroids (Popescu+, 2018)
Taxonomic classification of asteroids based on MOVIS near-infrared colors.
Popescu M., Licandro J., Carvano J. M., Stoicescu R., de Leon J.,
Morate D., Boaca I.L., Cristescu C. P.
<Astron. Astrophys. 617, A12 (2018)>
=2018A&A...617A..12P 2018A&A...617A..12P (SIMBAD/NED BibCode)
ADC_Keywords: Solar system ; Minor planets ; Photometry, infrared ;
Photometry, classification
Keywords: minor planets - techniques: photometric - techniques: spectroscopic -
methods: observations - methods: statistical
Abstract:
We tabulate the taxonomic classification of 18265 asteroids
catalogued by MOVIS. A probabilistic method and the k-nearest
neighbors (KNN k=3) algorithm are used to assign a taxonomic type for
each object.
Description:
The classification is based on (Y-J), (J-Ks), and (H-Ks) colours. The
observations are part of the VISTA - VHS survey and were retrieved
using MOVIS pipeline (Popescu et al., 2016, Cat. J/A+A/591/A115). The
VHSv20161007 intermediate data release was used. Because our taxonomy
is based only on NIR colors, several classes from Bus-DeMeo
classification system 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 miss-identifications with other types).
The two algorithms used in this study suggest 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,
e_(Y-J)<0.118 and e_(J-Ks)err<0.136. This set includes 144 bodies
classified as Bk, 613 as C, 197 as Cgx, 91 as Xt, 440 as Ds,
665 as Kl, 233 as Ad, 3315 as S, and 798 as V.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
movistax.dat 372 18265 MOVIS taxonomic classification catalog
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See also:
J/A+A/591/A115 : VISTA-VHS (MOVIS) minor planets NIR photometry (Popescu+ 2016)
Byte-by-byte Description of file: movistax.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Number Main designation of each object: the number or
the provisional designation if the objects is
unnumbered (MainDesig)
12-165 A154 --- Names All designations of each object (1)
167-178 A12 --- Class Object orbital class, obtained from SkyBoT
(EquivDesig) (2)
180-198 E19.15 mag Y-J (Y-J) color magnitude (YmJ)
200-216 F17.15 mag e_Y-J (Y-J) color magnitude error (YmJerr)
218-234 F17.13 min DtY-J Time interval between the observation in
Y band and the observation in J band,
used to compute Y-J (YmJt_min)
236-253 F18.15 mag J-Ks (J-Ks) color magnitude (JmK)
255-271 F17.15 mag e_J-Ks (J-Ks) color magnitude error (JmKerr)
273-290 F18.14 min DtJ-Ks Time interval between the observation in
J band and the observation in Ks band,
used to compute J-K (JmKt_min)
292-311 E20.15 mag H-Ks ? (H-Ks) color magnitude (YmK) (3)
313-329 F17.15 mag e_H-Ks ? (H-Ks) color magnitude error (YmKerr) (3)
331-346 F16.13 min DtH-Ks ? Time interval between the observation in
Y band and the observation in Ks band,
used to compute Y-Ks (YmKt_min) (3)
348-350 A3 --- ClassKNN The taxonomic type assigned by K-nearest
neighbours algorithm (k=3) (TaxClassKNN)
352-359 F8.6 --- KNNProb The classification probability for the
KNN algorithm. It was derived based on
Monte-Carlo simulation (KNNMCProb)
361-363 A3 --- ClassProb The taxonomic type assigned based on
probabilistic approach (TaxClassProb)
365-368 F4.2 --- ProbProb The classification probability
corresponding to probabilistic approach
(ProbProb)
370-372 A3 --- ClassFin The final taxonomic classification assigned
(TaxClassFin) (4)
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Note (1): All designations of each object, example:
163|A892 RA|1957 OT|1892 RA|Erigone
Note (2): For asteroids, this classification is according to the
characteristics of their orbits.
Note (3): "?" stands for null values (i.e. color not available/observed).
Note (4): Final taxonomic classification assigned when
TaxClassKNN ≡ TaxClassProb and the color errors e_(Y-J)≤0.118 and
e_(J-Ks)≤0.136. Otherwise, the U letter marks the asteroids for which
we did not assigned a final class.
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Acknowledgements:
Marcel Popescu, popescu.marcel1983(at)gmail.com
(End) Marcel Popescu [IMCCE], Patricia Vannier [CDS] 19-Jun-2018