TNOs' Taxonomy Confirmed

Details TNOs' Taxonomy Confirmed TNOs' Taxonomy Confirmed

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.4005f&link_type=abstract

American Astronomical Society, DPS meeting #38, #40.05; Bulletin of the American Astronomical Society, Vol. 38, p.556

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Scientific paper

To expand the TNOs’ taxonomy previously proposed (Barucci et al., A&A,371, 1150-1154, 2001; Fulchignoni et al., Earth, Moon and Planets 92, 243-250, 2003; Barucci et al., A.J., 130, 1291-1298, 2005) we analysed the TNO colour data for two groups of objects: the first contains 67 object described by four colours (B-V,V-R,V-I,V-J) and the second contains the only 53 objects for which H and K photometry has been obtained in addition to the others colors, providing a six colors characterization of the sample.
As in the previous works, we analysed the TNOs samples using both the Principal Component Analysis (PCA) (Reyment & Joreskog, 1993) and the G-mode analysis (Coradini et al., The Moon 16,175-190, 1976; Barucci et al., Icarus 78, 311-322, 1987; Fulchignoni et al., Icarus 246, 204-212, 2000).
The same four homogeneous groups of objects found by Barucci et al. (2005) have been recognized in the present analysis, whatever four or six colors are used as variables, that provides a strong indication of the robustness of the obtained classification.
The two-letter designation of the found groups, introduced to distinguish TNO taxonomy from the asteroid taxonomy, has been clearly confirmed: objects having a neutral color with respect to the Sun are classified as BB ("blue") group, those having a very high red color are classified as RR ("red"). The BR group consists of objects with an intermediate blue-red color while IR group includes moderately red objects.

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