Data Set Information
DATA_SET_NAME EIGHT COLOR ASTEROID SURVEY
DATA_SET_ID EAR-A-2CP-3-RDR-ECAS-V3.1
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
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
DATA_SET_RELEASE_DATE 2002-05-10T00:00:00.000Z
START_TIME 1979-05-31T12:00:00.000Z
STOP_TIME 1983-05-10T12:00:00.000Z
MISSION_NAME SUPPORT ARCHIVES
MISSION_START_DATE 2004-03-22T12:00:00.000Z
MISSION_STOP_DATE N/A (ongoing)
TARGET_NAME ASTEROID
TARGET_TYPE ASTEROID
INSTRUMENT_HOST_ID VARGBTEL
INSTRUMENT_NAME 2 CHANNEL PHOTOMETER
INSTRUMENT_ID 2CP
INSTRUMENT_TYPE PHOTOMETER
NODE_NAME Small Bodies
ARCHIVE_STATUS SUPERSEDED
CONFIDENCE_LEVEL_NOTE Confidence Level Overview : 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. Review : This dataset underwent a formal external review on May 10, 2002.
CITATION_DESCRIPTION Zellner, B., Tholen, D.J., and Tedesco, E.F., Eight Color Asteroid Survey. EAR-A-2CP-3-RDR-ECAS-V3.1. NASA Planetary Data System, 2002.
ABSTRACT_TEXT This data set contains the reflectance spectra and associated data of the Eight Color Asteroid Survey (ECAS), including results for 589 asteroids.
PRODUCER_FULL_NAME CAROL NEESE
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