| DATA_SET_DESCRIPTION |
Data Set Overview : The eight color asteroid survey 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 In addition, the mean spectra of the 'ecasmean.tab' file are also provided as individual spectrum files, one for each object. 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 In addition, each existing data file and label was examined for compliance with current PDS standards and SBN practices. The following changes were made to existing data files: o In the ecas.tab, ecasmean.tab and ecaspc.tab files, names were added for those asteroids having official names. o In the ecas.tab file, the time of observation field has been reformatted from a 'YYMMDD.ddd' format to the standard 'yyyy-mm-ddThh:mm' format. o In PDS labels, the non-standard unit 'MILLIMAGNITUDE' was replaced by 'MAGNITUDE' with a SCALING_FACTOR value of '1.E-03'. In addition, the mean spectra in the ecasmean.tab file were split into separate files to facilitate plotting. The spectrum for 152 Atala is omitted from this collection because of the notation in the main data file casting doubt on the quality of the data. Media/Format : This dataset is released in the form of ASCII files which may be stored on disk or other magnetic medium and which may be distributed by ftp, email, real-time access by remote login, or by whatever means is most convenient.
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