Comparison of asteroid and meteorite spectra - Classification by principal component analysis

Abstract The relationships between asteroid and meteorite spectral types are a subject of much discussion and debate. To provide an overview of spectral similarities between and among asteroids and meteorites, the spectra of 103 meteorites and 411 asteroids were statistically compared using principal component analysis. This analysis produced a “map” of statistically defined spectral similarities in which distance is a measure of relative similarity. There appears to be considerably more spectral variance in the meteorite collection than is seen in the asteroids. Also, many planet-crossing asteroids are spectrally much more similar to the meteorites than most main belt asteroids. The principal components of meteorite spectra are, in general, offset from those of the bulk of the asteroid population. The offset of the carbonaceous chondrite and iron meteorites from their most frequently suggested asteroidal analogues is particularly notable. Finally, the analysis shows no direct meteorite analogues from the outerbelt B-, D-, F-, P-, and T-type asteroids, confirming that meteorites sample only a relatively limited portion of the inner asteroid belt.

[1]  M. Gaffey.  Rotational spectral variations of asteroid (8) Flora: Implications for the nature of the S-type asteroids and for the parent bodies of the ordinary chondrites , 1984 .

[2]  R. Greenberg,et al.  Asteroidal regoliths: what we do not know , 1989 .

[3]  C. Chapman,et al.  Spectroscopic evidence for undifferentiated S-type asteroids , 1982 .

[4]  M. Gaffey,et al.  Asteroid surface materials: Mineralogical characterizations from reflectance spectra , 1977 .

[5]  T. Bertre,et al.  Surface texture of Vesta from optical polarimetry , 1980 .

[6]  Jack Wisdom,et al.  Urey Prize Lecture - Chaotic dynamics in the solar system , 1987 .

[7]  A. Dollfus,et al.  Photopolarimetry of asteroids , 1989 .

[8]  D. Tholen,et al.  Asteroid Taxonomy from Cluster Analysis of Photometry. , 1984 .

[9]  M. Gaffey,et al.  Mineralogical-petrological characterization of near-Earth asteroids , 1984 .

[10]  Steven J. Ostro.  Radar observations of asteroids , 1989 .

[11]  Dale P. Cruikshank,et al.  Reflectance spectroscopy and asteroid surface mineralogy , 1989 .

[12]  John B. Adams,et al.  Spectral reflectance 0.4 to 2.0 microns of silicate rock powders. , 1967 .

[13]  Michael J. Gaffey,et al.  Spectral reflectance characteristics of the meteorite classes , 1976 .

[14]  R. Reyment,et al.  Statistics and Data Analysis in Geology. , 1988 .

[15]  P. Pellas.  Ordinary-chondrite-type asteroids in the main belt: Can we believe the zero abundance found by spectral studies from earth based telescopes? , 1988 .

[16]  D. J. Tholen,et al.  Physical properties of Aten, Apollo and Amor asteroids. , 1989 .

[17]  R. Hutchison,et al.  Catalogue of Meteorites , 1985 .

[18]  G. Consolmagno,et al.  The nature of Low-Albedo asteroids from 3-μm multi-color photometry , 1989 .

[19]  Dale P. Cruikshank,et al.  Three basaltic earth-approaching asteroids and the source of the basaltic meteorites , 1991 .

[20]  M. Gaffey,et al.  Spectrophotometry (0.33 to 1.07 μm) of 433 Eros and compositional implications , 1976 .

[21]  E. Anders,et al.  Meteorites and the Early Solar System , 1971 .

[22]  G. Wetherill.  ASTEROIDAL SOURCE OF ORDINARY CHONDRITES , 1985 .

[23]  W. Hartmann,et al.  The Meteorite-Asteroid Connection: Two Olivine-Rich Asteroids , 1984, Science.

[24]  E. Tedesco,et al.  Compositional Structure of the Asteroid Belt , 1982, Science.

[25]  B. Hapke.  Bidirectional reflectance spectroscopy , 1984 .

[26]  Spectral alteration effects in chondritic gas-rich breccias - Implications for S-Class and Q-Class asteroids , 1988 .

[27]  M. Nolan,et al.  Delivery of asteroids and meteorites to the inner solar system , 1989 .

[28]  B. Hapke.  Bidirectional reflectance spectroscopy: 1. Theory , 1981 .

[29]  Angioletta Coradini,et al.  Classification of asteroids using G-mode analysis , 1987 .

[30]  T V Johnson,et al.  Asteroid Vesta: Spectral Reflectivity and Compositional Implications , 1970, Science.

[31]  J. Williams,et al.  A Three-Parameter Asteroid Taxonomy , 1989 .

[32]  David Morrison,et al.  Surface properties of asteroids - A synthesis of polarimetry, radiometry, and spectrophotometry , 1975 .

[33]  Torrence V. Johnson,et al.  Optical properties of carbonaceous chondrites and their relationship to asteroids , 1973 .

[34]  D. J. Tholen,et al.  The Eight-Color Asteroid Survey: Results for 589 Minor Planets , 1985 .

[35]  R. T. Dodd.  Meteorites. A petrologic-chemical synthesis. , 1981 .

[36]  W. Hartmann,et al.  Asteroids - The big picture , 1989 .

[37]  I. Shapiro,et al.  Mainbelt Asteroids: Dual-Polarization Radar Observations , 1985, Science.

[38]  M. Gaffey,et al.  Asteroids: Surface Composition from Reflection Spectroscopy , 1974, Science.

[39]  M. Gaffey.  The spectral and physical properties of metal in meteorite assemblages: Implications for asteroid surface materials , 1986 .

[40]  C. Chapman.  Asteroids as meteorite parent-bodies: the astronomical perspective , 1976 .

[41]  L. McFadden.  Spectral Reflectance of Near-Earth Asteroids: Implications for Composition, Origin and Evolution , 1983 .