Description of the EIGHT COLOR ASTEROID SURVEY bundle V1.0
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Bundle Generation Date: 2020-06-12
Peer Review: 2008 Asteroid Review, 2008-06-12                                 
Discipline node: Small Bodies Node


Content description based on the data set catalog file description for the PDS3 version, EAR-A-2CP-3-RDR-ECAS-V4.0
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Note: for PDS3 data sets migrated to PDS4, the following text is taken
verbatim from the data set description and confidence level note of the
PDS3 data set catalog file. In these cases, some details may not be correct
as a description of the PDS4 bundle.
                                                           
    The eight color asteroid survey (ECAS) provides reflectance spectra for   
    minor planets using eight filter passbands.  This dataset includes the    
    primary data obtained for 589 minor planets, the mean values for each     
    minor planet included in the survey, the principal component scores       
    derived from the primary data, the response curves, effective wavelengths,
    and bandpasses for the filters, and the coordinates and values determined 
    for standard stars defining the system. With version 3.0, five additional 
    files were added to provide, overall class color indices and albedos,     
    eigenvalues, the color index correlation matrix and the component loading 
    matrix.                                                                   
                                                                              
     Data                                                                     
      ====                                                                    
      The compiled data are provided in ten ASCII data tables:                
                                                                              
        ecas.tab     - Primary data                                           
        ecasmean.tab - Mean values derived from primary data                  
        ecaspc.tab   - Principal component scores for each asteroid,          
                       derived from the primary data                          
        ecasev.tab   - Eigenvectors used in computing the principal           
                       component scores (version 3.0 and later)               
        ecascm.tab   - The color index correlation matrix (version            
                       3.0 and later)                                         
        ecasclm.tab  - The component loadings matrix (version 3.0 and         
                       later)                                                 
        colorind.tab - Average and extreme color indices for each             
                       asteroid class (version 3.0 and later)                 
        classalb.tab - Average and extreme albedo values for each             
                       asteroid class (version 3.0 and later)                 
        ecasstds.tab - Standard stars defining the ECAS photometric           
                       system                                                 
        ecasband.tab - Effective wavelengths and bandpasses of the            
                       filters                                                
        ecasfltr.tab - Transmission curves for the eight filters              
                       used, and transmission and reflectance curves          
                       of the dichroic beam-splitter                          
        albedos.tab -  The albedos used in the ECAS taxonomic                 
                       classifications                                        
        albedonotes.tab - Notes to the albedos file                           
                                                                              
                                                                              
      Modification History                                                    
      ====================                                                    
      Five new data files were added for version 3.0:                         
                                                                              
         1. classalb.tab                                                      
         2. colorind.tab                                                      
         3. ecasclm.tab                                                       
         4. ecascm.tab                                                        
         5. ecasev.tab                                                        
                                                                              
      Two new data files were added for version 4.0:                          
                                                                              
         1. albedos.tab                                                       
         2. albedonotes.tab                                                   
                                                                              
      References                                                              
      ==========                                                              
                                                                              
    Tedesco, E.F., D.J. Tholen, and B. Zellner, The eight-color asteroid      
    survey: Standard stars, The astronomical Journal, 87, 11:1585-1592, 1982. 
    [TEDESCOETAL1982]                                                         
                                                                              
    Tholen, D.J., and M.A. Barucci, Asteroid Taxonomy,  In Asteroids II (R.P. 
    Binzel, T. Gehrels, and M.S. Matthews, Eds.) pp. 298-315, University of   
    Arizona Press, Tucson, 1984.  [THOLEN89]                                  
                                                                              
    Tholen, D.J., Asteroid Taxonomy from Cluster Analysis of Photometry, Ph.D.
    dissertation, University of Arizona, 1984.  [THOLEN1984]                  
                                                                              
    Zellner, B., D.J. Tholen, and E.F. Tedesco, The Eight-Color Asteroid      
    Survey: Results for 589 Minor Planets, Icarus 61, 355-416, 1985.          
    [ZELLNERETAL1985]


Known issues or problems with the data
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    The RMS errors of the individual observations are included in the dataset.
    The reliability of the data may be estimated by comparing multiple        
    observations of each object.

PDS3 Source
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Version 1.0 of this bundle was migrated from version 4.0 of the PDS3 data set EAR-A-2CP-3-RDR-ECAS-V4.0.