Bus-DeMeo Taxonomy: Extending Asteroid Taxonomy Into The Near-infrared

Details Bus-DeMeo Taxonomy: Extending Asteroid Taxonomy Into The Near-infrared Bus-DeMeo Taxonomy: Extending Asteroid Taxonomy Into The Near-infrared

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.2822b&link_type=abstract

American Astronomical Society, DPS meeting #40, #28.22; Bulletin of the American Astronomical Society, Vol. 40, p.440

Astronomy and Astrophysics

Astronomy

Scientific paper

Tholen (1984; U. Arizona, Ph.D. thesis) and Bus (1999; MIT, Ph.D. thesis) classify asteroids based on their spectral properties over visible wavelengths. With the advent of near-infrared instrumentation (such as SpeX on the NASA IRTF; Rayner 2003; PASP 115, 362), an increasing number of asteroids have spectra covering the range 0.45- to 2.45-microns. We extend asteroid taxonomy to take advantage of near-infrared spectral information, where these reported results are from DeMeo (2007; MIT master's thesis). Using 0.45- to 2.45-micron measurements of 365 asteroids, sampling all 26 classes of Bus (1999), classes are quantified by spectral slope and five dimensions of Principal Component Analysis, accounting for 99.9% of the variance. Principal component space dramatically separates objects having (or lacking) 1- and 2-micron absorption features. We find 24 Bus classes remain robust when extended to 2.45-microns; eliminated are Ld, Sl, and Sk. We clarify, and in some cases redefine the Bus S complex classes (Sa, Sl, Sk, Sq, Sr). A new intermediate class, Sv, bridges the S- and V-classes. We introduce a "w" ("weathered") notation to denote objects that differ only in slope from their spectral neighbors. (NOTE: "w" is a notation only. For example, S- and Sw-type objects are the same class.) High-sloped S, Sa, Sq, Sr, Sv, V and Q objects are given a "w" notation. Here we present the principal component space, eigenvectors, definitions and examples for each class. We announce the availability of a web tool allowing all researchers to determine asteroid classifications for objects having 0.45- to 2.45-micron measurements. Classification for "SpeX only data” containing 0.85- to 2.45 micron measurements is also being implemented. See: http://smass.mit.edu/cgi-bin/demeoclass-cgi/

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