CCSD3ZF0000100000001NJPL3IF0PDS200000001 = SFDU_LABEL /* File Format and Length */ RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 60 FILE_RECORDS = 405 DATA_SET_ID = "EAR-A-2CP-5-DDR-ECAS-PRINCIPAL-COMP-V1.0" /* Record Pointer to Major Object */ ^TABLE = "ECASPC.TAB" /* Description of Object in File */ RECORD_FORMAT = "(I5,3X,7(F6.3,1X),A1)" OBJECT = TABLE ROWS = 405 ROW_BYTES = 60 INTERCHANGE_FORMAT = ASCII COLUMNS = 9 DESCRIPTION = " This file contains principal component scores for a subset of the asteroids observed during the Eight-Color Asteroid Survey (Zellner et al. 1985) that had 'high quality' color indices. For purposes of selecting this subset, a 'high quality' set of color indices referred to those for which all seven error bars (one standard deviation) were less than 0.43 times the standard deviation of the color indices in each color for the entire set of asteroids. The value of 0.43 was chosen somewhat arbitrarily to maximize the number of objects included in the sample while minimizing the noise in the data that the sample represented. The principal component scores have been used primarily to illustrate the clustering of asteroids in two-dimensional space. See Figs. 2-4 of Tholen and Barucci (1989) for some examples. References: Tholen, D. J. 1984. Asteroid Taxonomy from Cluster Analysis of Photometry. Ph.D. dissertation, University of Arizona. Tholen, D. J., and M. A. Barucci 1989. Asteroid taxonomy. In Asteroids II (R. P. Binzel, T. Gehrels, and M. S. Matthews, Eds.), pp. 298-315. Univ. of Arizona Press, Tucson. Zellner, B., D. J. Tholen, and E. F. Tedesco 1985. The eight-color asteroid survey: Results for 589 minor planets. Icarus 61, 355-416. David J. Tholen 1994 January 28 " OBJECT = COLUMN NAME = "ASTEROID_ID" DATA_TYPE = ASCII_INTEGER START_BYTE = 1 BYTES = 5 FORMAT = I5 END_OBJECT OBJECT = COLUMN NAME = "FIRST_PRINCIPAL_COMPONENT" DATA_TYPE = ASCII_REAL START_BYTE = 9 BYTES = 6 FORMAT = "F6.3" END_OBJECT OBJECT = COLUMN NAME = "SECOND_PRINCIPAL_COMPONENT" DATA_TYPE = ASCII_REAL START_BYTE = 16 BYTES = 6 FORMAT = "F6.3" END_OBJECT OBJECT = COLUMN NAME = "THIRD_PRINCIPAL_COMPONENT" DATA_TYPE = ASCII_REAL START_BYTE = 23 BYTES = 6 FORMAT = "F6.3" END_OBJECT OBJECT = COLUMN NAME = "FOURTH_PRINCIPAL_COMPONENT" DATA_TYPE = ASCII_REAL START_BYTE = 30 BYTES = 6 FORMAT = "F6.3" END_OBJECT OBJECT = COLUMN NAME = "FIFTH_PRINCIPAL_COMPONENT" DATA_TYPE = ASCII_REAL START_BYTE = 37 BYTES = 6 FORMAT = "F6.3" END_OBJECT OBJECT = COLUMN NAME = "SIXTH_PRINCIPAL_COMPONENT" DATA_TYPE = ASCII_REAL START_BYTE = 44 BYTES = 6 FORMAT = "F6.3" END_OBJECT OBJECT = COLUMN NAME = "SEVENTH_PRINCIPAL_COMPONENT" DATA_TYPE = ASCII_REAL START_BYTE = 51 BYTES = 6 FORMAT = "F6.3" END_OBJECT OBJECT = COLUMN NAME = "NOTE" DESCRIPTION = " Notes: Comments on individual entries in the ECASPC.DAT file: 1 - The principal component scores for (152) Atala given in the reference have been blanked in this file because the object was apparently misidentified during the course of the Eight-Color Asteroid Survey, a conclusion based on the inconsistency of these data with those obtained by other observers. 2 - The principal component scores for (3288) Seleucus were published in the reference under the provisional designation 1982 DV. " DATA_TYPE = ASCII_INTEGER START_BYTE = 58 BYTES = 1 FORMAT = A1 END_OBJECT END_OBJECT = TABLE OBJECT = DSREFINFO REFERENCE_KEY_ID = "THOLEN1984" OBJECT = REFERENCE DOCUMENT_TOPIC_TYPE = "ASTEROID_TAXONOMY" JOURNAL_NAME = "N/A" PUBLICATION_DATE = 1984 REFERENCE_DESC = "D. J. Tholen 1984. Asteroid Taxonomy from Principal Components Analysis of Photometry. Ph.D. dissertation, University of Arizona." OBJECT = REFERENCE_AUTHORS AUTHOR_FULL_NAME = "DAVID J. THOLEN" END_OBJECT = REFERENCE_AUTHORS END_OBJECT = REFERENCE END_OBJECT = DSREFINFO OBJECT = DSREFINFO REFERENCE_KEY_ID = "THOLENETAL1989" OBJECT = REFERENCE DOCUMENT_TOPIC_TYPE = "ASTEROID_TAXONOMY" JOURNAL_NAME = "N/A" PUBLICATION_DATE = 1989 REFERENCE_DESC = "Tholen, D. J., and M. A. Barucci 1984. Asteroid Taxonomy. In Asteroids II (R. P. Binzel, T. Gehrels, and M. S. Matthews, Eds.) pp. 298-315. University of Arizona Press, Tucson.." OBJECT = REFERENCE_AUTHORS AUTHOR_FULL_NAME = "DAVID J. THOLEN" END_OBJECT = REFERENCE_AUTHORS OBJECT = REFERENCE_AUTHORS AUTHOR_FULL_NAME = "M. ANTONIETTA BARUCCI" END_OBJECT = REFERENCE_AUTHORS END_OBJECT = REFERENCE END_OBJECT = DSREFINFO END