Data Set Information
DATA_SET_TERSE_DESCRIPTION Taxonomic classifications of asteroids
Data Set Overview
  This dataset provides taxonomic classifications of asteroids in each of
  eight different systems: Tholen (1984, 1989) [THOLEN1984, THOLEN1989];
  Barucci, et al. (1987) [BARUCCIETAL1987]; Tedesco et al. (1989)
  [TEDESCOETAL1989]; Howell, et al. (1994) [HOWELLETAL1994], Xu et al. (1995)
  [XUETAL1995], Bus and Binzel (2002) [BUS&BINZEL2002B], S3OS2
  [LAZZAROETAL2004], and Bus-DeMeo [DEMEOETAL2009].
  The data set contains entries for 2615 objects.  Each of the eight
  taxonomies represented in this data set produced classifications for a
  subset of these objects:
    Tholen (1984, 1989)      978 objects
    Barucci et al. (1987)    438 objects
    Tedesco et al. (1989)    357 objects
    Howell et al. (1994)     112 objects
    Xu et al. (1995)         221 objects
    Bus and Binzel (2002)   1447 objects
    Lazzaro et al. (2004)    820 objects
    DeMeo et al. (2009)      371 objects
  Asteroid taxonomy is the grouping of asteroids into a small number of
  classes whose members have similar spectral reflectance properties.  The
  classification efforts prior to 1990 utilized only the reflectivities
  between 0.3 and 1.1 microns for this purpose (see Zellner et al. 1985 and
  Tedesco 1989); more recently, infrared data extending to 2.5 microns were
  used for a new classification scheme (Howell et al. 1994).
  There are many different ways to perform this type of cluster analysis, and
  the different classifications tabulated in this dataset represent different
  algorithms developed during the past twenty years (Tholen 1984, Barucci et
  al. 1987, Tedesco et al. 1989, Howell et al. 1994, Xu et al. 1995, and Bus
  and Binzel 2002), as well as an extension of one of these algorithms to
  additional objects (Tholen 1989, Mueller et al. 1992, Lazzaro et al. 2004).
  Detailed descriptions of each method can be found in the corresponding
  In this particular dataset, the parameter fields indicate which parameters
  were used to arrive at the classification for the corresponding asteroid in
  each of the taxonomies.  A number indicates the number of color indices
  utilized, the letter 'G' indicates that a groundbased radiometric albedo was
  also utilized, and the letter 'I' indicates that an IRAS radiometric albedo
  was utilized.  The letter 'A' indicates that an albedo of unspecified source
  was used to eliminate some other possible classes based on the spectrum
  alone.  The letter 'S' indicates that the classification is based on a
  medium resolution spectrum published by Chapman and Gaffey (1979), while the
  higher resolution spectra obtained by Xu et al. (1995) and Bus and Binzel
  (2002) are indicated by a lowercase 's'.  The Howell et al. (1994)
  classifications are all based on a combination of 8-color (Zellner et al.
  1985) and 52-color (Bell et al. 1988) data, resampled at 65 points to
  provide more uniform wavelength sampling.
  The S3OS2 (Lazzaro et al.) survey provides two classifications, one a
  'Tholen-like' classification but with the introduction of additional classes
  Caa and K, and one according to the method of Bus and Binzel (2002).  Albedo
  was not used in deriving the S3OS2 classifications.  The effective spectral
  range for the S3OS2 survey was 4900-9200 Angstroms.
  The Bus-DeMeo (DeMeo et al. 2009) classification is accompanied by a
  reference to the published observations that were used to classify each
  Five entries have a notation in the comment field regarding the
  identification of the object.  The details pertaining to each case are in
  the column description for the comment field in the data label.
  Barucci, M. A., M. T. Capria, A. Coradini, and M. Fulchignoni 1987.
  Classification of asteroids using G-mode analysis.  Icarus 72, 304-324.
  Bell, J. F., P. D. Owensby, B. R. Hawke, and M. J. Gaffey 1988.  The
  52-color asteroid survey: Final results and interpretation.  Lunar Planet.
  Sci. Conf. XIX, 57.
  Bowell, E., T. Gehrels, and B. Zellner 1979.  Magnitudes, colors, types, and
  adopted diameters of the asteroids.  In Asteroids (T. Gehrels, Ed.), pp.
  1108-1129.  Univ. of Arizona Press, Tucson.
  Bus, S.J. and R.P. Binzel 2002.  Phase II of the small main-belt asteroid
  spectroscopic survey:  A feature-based taxonomy.  Icarus 158, 146-177.
  Chapman, C. R., and M. J. Gaffey 1979.  Reflectance spectra for 277
  asteroids.  In Asteroids (T. Gehrels, Ed.), pp. 655-687.  Univ. of Arizona
  Press, Tucson.
  DeMeo, F., R.P. Binzel, S.M. Slivan, and S.J. Bus, An extension of the Bus
  asteroid taxonomy into the near-infrared, Icarus 202, 160-180, 2009.
  Howell, E. S., E. Merenyi, and L. A. Lebofsky 1994. Classification of
  asteroid spectra using a neural network.  J. Geophys. Res. 99, 10847-10865.
  Lazzaro, D., C.A. Angeli, J.M. Carvano, T. Mothe-Diniz, R. Duffard, and M.
  Florczak, S3OS2: The visible spectroscopic survey of 820 asteroids, Icarus
  172, 179-220, 2004.
  Mueller, B. E. A., D. J. Tholen, W. K. Hartmann, and D. P. Cruikshank 1992.
  Extraordinary colors of asteroidal object (5145) 1992 AD.  Icarus 97,
  Tedesco, E. F. 1989.  Asteroid magnitudes, UBV colors, and IRAS albedos and
  diameters.  In Asteroids II (R. P. Binzel, T. Gehrels, and M. S. Matthews,
  Eds.), pp. 1090-1138.  Univ. of Arizona Press, Tucson.
  Tedesco, E. F., J. G. Williams, D. L. Matson, G. J. Veeder, J. C. Gradie,
  and L. A. Lebofsky 1989.  A three-parameter asteroid taxonomy.  Astron. J.
  97, 580-606.
  Tholen, D. J. 1984.  Asteroid Taxonomy from Cluster Analysis of Photometry.
  Ph.D. dissertation, University of Arizona.
  Tholen, D. J. 1989.  Asteroid taxonomic classifcations.  In Asteroids II (R.
  P. Binzel, T. Gehrels, and M. S. Matthews, Eds.), pp. 1139-1150.  Univ. of
  Arizona Press, Tucson.
  Xu, S., R. P. Binzel, T. H. Burbine, S. J. Bus 1995.  Small main-belt
  asteroid spectroscopic survey: Initial Results.  Icarus 115, 1-35.
  Zellner, B., D. J. Tholen, and E. F. Tedesco 1985.  The eight-color asteroid
  survey: Results for 589 minor planets.  Icarus 61, 355-416.
  Modification History
  The asteroid taxonomy data set was first reviewed and ingested in 1993, and
  was updated in 1997 to include the neural net taxonomy of Howell et al.
  (1994) [HOWELLETAL1994].  It was updated in 1999 to include the taxonomic
  classifications of the SMASS survey, Xu et al. (1995) [XUETAL1995].  In 2002
  it was updated to include the classifications of the SMASSII survey, Bus and
  Binzel (2002) [BUS&BINZEL2002].  In 2005 it was updated to include the
  taxonomy of the S3OS2 survey [LAZZAROETAL2004].  In 2010 it was updated to
  include the Bus-DeMeo classifications.
  The data table includes taxonomic classifications and the parameters used to
  derived the classification in many of the classification systems.
DATA_SET_RELEASE_DATE 2010-06-07T00:00:00.000Z
START_TIME 1989-01-01T12:00:00.000Z
STOP_TIME 2008-05-10T12:00:00.000Z
MISSION_START_DATE 2004-03-22T12:00:00.000Z
MISSION_STOP_DATE 3000-01-01T12:00:00.000Z
NODE_NAME Small Bodies
Confidence Level Overview
    Five entries have a notation in the comment field regarding the
    identification of the object.  The notations are explained in the column
    description of the comment field in the data label.
CITATION_DESCRIPTION Neese, C., Ed., Asteroid Taxonomy V6.0. EAR-A-5-DDR-TAXONOMY-V6.0. NASA Planetary Data System, 2010.
ABSTRACT_TEXT This data set is a collection of asteroid taxonomic classifications from various classification methods, collected from the literature.