PDS_VERSION_ID = PDS3 /* File Characteristics */ RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 64 FILE_RECORDS = 1199 /* Data Object Pointers */ ^TABLE = "taxonomy.tab" /* Identification Keywords */ DATA_SET_ID = "EAR-A-5-DDR-TAXONOMY-V3.0" PRODUCT_NAME = "Asteroid Taxonomy" PRODUCT_ID = "TAXONOMY-TAXONOMY-199904" INSTRUMENT_HOST_NAME = "N/A" INSTRUMENT_NAME = "N/A" TARGET_NAME = ASTEROID START_TIME = "N/A" STOP_TIME = "N/A" PRODUCT_CREATION_TIME = 1999-04-09 /* Peer Review Date */ /* Data Object Descriptions */ OBJECT = TABLE ROWS = 1199 ROW_BYTES = 64 INTERCHANGE_FORMAT = ASCII COLUMNS = 12 DESCRIPTION = " The data set contains entries for 1199 objects. Each of the five 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 In this particular data set, the four parameter fields indicate which parameters were used to arrive at the classification for the corresponding asteroid in each of the first four taxonomies. " OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "ASTEROID NUMBER" DESCRIPTION = "For unnumbered asteroids, this field is blank." DATA_TYPE = ASCII_INTEGER START_BYTE = 1 BYTES = 5 FORMAT = I5 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "ASTEROID PROVISIONAL DESIGNATION" DESCRIPTION = "For numbered asteroids, this field may be blank." DATA_TYPE = CHARACTER START_BYTE = 7 BYTES = 10 FORMAT = A10 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = "THOLEN CLASSIFICATION" DESCRIPTION = "Taxonomic classification according to the method of Tholen (1984, 1989)." DATA_TYPE = CHARACTER START_BYTE = 17 BYTES = 6 FORMAT = A6 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = "THOLEN PARAMETERS" DESCRIPTION = "Parameters used for the Tholen (1984, 1989) classification. The four parameter fields indicate which parameters were used to arrive at the classification for the corresponding asteroid: number the number of color indices used G groundbased radiometric albedo I IRAS radiometric albedo A An albedo of unspecified source was used to eliminate some other possible classes based on the spectrum alone. S The classification is based on a medium resolution spectrum published by Chapman and Gaffey (1979)." DATA_TYPE = CHARACTER START_BYTE = 24 BYTES = 3 FORMAT = A3 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 NAME = "BARUCCI CLASSIFICATION" DESCRIPTION = "Taxonomic classification according to the method of Barucci et al. (1987)." DATA_TYPE = CHARACTER START_BYTE = 29 BYTES = 2 FORMAT = A2 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 6 NAME = "BARUCCI PARAMETERS" DESCRIPTION = "Parameters used for the Barucci et al. (1987) classification. The four parameter fields indicate which parameters were used to arrive at the classification for the corresponding asteroid: number the number of color indices used G groundbased radiometric albedo I IRAS radiometric albedo A An albedo of unspecified source was used to eliminate some other possible classes based on the spectrum alone. S The classification is based on a medium resolution spectrum published by Chapman and Gaffey (1979)." DATA_TYPE = CHARACTER START_BYTE = 32 BYTES = 2 FORMAT = A2 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 7 NAME = "TEDESCO CLASSIFICATION" DESCRIPTION = "Taxonomic classification according to the method of Tedesco et al. (1989)." DATA_TYPE = CHARACTER START_BYTE = 37 BYTES = 3 FORMAT = A3 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 8 NAME = "TEDESCO PARAMETERS" DESCRIPTION = "Parameters used for the Tedesco et al. (1989) classification. The four parameter fields indicate which parameters were used to arrive at the classification for the corresponding asteroid: number the number of color indices used G groundbased radiometric albedo I IRAS radiometric albedo A An albedo of unspecified source was used to eliminate some other possible classes based on the spectrum alone. S The classification is based on a medium resolution spectrum published by Chapman and Gaffey (1979)." DATA_TYPE = CHARACTER START_BYTE = 41 BYTES = 2 FORMAT = A2 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 9 NAME = "HOWELL CLASSIFICATION" DESCRIPTION = "Taxonomic classification according to the Howell (1994) method." DATA_TYPE = CHARACTER START_BYTE = 46 BYTES = 6 FORMAT = A6 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 10 NAME = "HOWELL PARAMETERS" DESCRIPTION = "Parameters used for the Howell classification. 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." DATA_TYPE = CHARACTER START_BYTE = 53 BYTES = 3 FORMAT = A3 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 11 NAME = "SMASS CLASSIFICATION" DESCRIPTION = "Taxonomic classification based on the spectra of the SMASS survey (Xu et al. 1995)." DATA_TYPE = CHARACTER START_BYTE = 57 BYTES = 3 FORMAT = A3 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 12 NAME = "COMMENT" DESCRIPTION = " Four entries have a notation of 'C' in the comment field, indicating a comment about the identification of the object. The comments are given here: The classification for (152) Atala in the original reference is based on data that have been found to be inconsistent with other observations. The current belief is that this object may have been misidentified during the course of the Eight-Color Asteroid Survey, therefore the classification has been changed to 'I' to reflect inconsistent data. The classifications for (2151) Hadwiger and (2422) Perovskaya are based on UBV colors published by Bowell et al. (1979), where they are identified as 1975 EA and 1975 GB, respectively. These designations are not the principal provisional designations, therefore the proper identity of these objects will not be obvious unless a listing of asteroid identifications is consulted. The classification for 1975 RC is also based on UBV colors published by Bowell et al. (1979), where it is identified as 1975 U2, which is not a proper provisional designation. Efforts to determine the correct identity of this object revealed that 1975 U2 appears to be a designation assigned by C.-I. Lagerkvist for his own personal use (prior to his learning of the formal provisional designation), but it was apparently also communicated to E. F. Tedesco, the observer of the colors. There was sufficient confusion generated by the investigation, however, that potential users of this classification should be warned that the identification of 1975 U2 as 1975 RC may be incorrect. The classification for (5145) Pholus listed in the Tholen classification column was taken from Mueller et al. (1992). " DATA_TYPE = CHARACTER START_BYTE = 61 BYTES = 1 FORMAT = A1 END_OBJECT = COLUMN END_OBJECT = TABLE END