PDS_VERSION_ID = PDS3 /* File Characteristics */ RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 80 FILE_RECORDS = 12487 /* Data Object Pointers */ ^TABLE = "family.tab" /* Identification Keywords */ DATA_SET_ID = "EAR-A-5-DDR-FAMILY-V2.0" PRODUCT_NAME = "Asteroid Dynamical Families" PRODUCT_ID = "FAMILY-FAMILY-199703" INSTRUMENT_HOST_NAME = "N/A" INSTRUMENT_NAME = "N/A" TARGET_NAME = ASTEROID START_TIME = "N/A" STOP_TIME = "N/A" PRODUCT_CREATION_TIME = 1997-03-24 /* Peer Review Date */ RECORD_FORMAT = "(i5,1x,a10,1x,f7.5,1x,f6.4,1x,f6.4,8x, a25,1x,a1,3x,i1)" /* Data Object Descriptions */ OBJECT = TABLE ROWS = 12487 ROW_BYTES = 80 INTERCHANGE_FORMAT = ASCII COLUMNS = 8 DESCRIPTION = "This data set includes the asteroid dynamical family classifications of [ZAPPALAETAL1995] for 12,487 numbered and unnumbered asteroids." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "ASTEROID CATALOG NUMBER" DESCRIPTION = "For unnumbered asteroids, this field is left 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 is left blank." DATA_TYPE = CHARACTER START_BYTE = 7 BYTES = 10 FORMAT = A10 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = "PROPER SEMIMAJOR AXIS" DESCRIPTION = "The proper elements recorded in this file are those actually used to derive the family memberships. They are those of version 6.8.5 of the fully analytical theory by Milani and Knezevic, reported in [MILANI&KNEZEVIC1994]). Asteroids having 2.065 < a' < 3.275 were included in this analysis." UNIT = "ASTRONOMICAL UNIT" DATA_TYPE = ASCII_REAL START_BYTE = 18 BYTES = 7 FORMAT = "F7.5" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = "PROPER ECCENTRICITY" DESCRIPTION = "The proper elements recorded in this file are those actually used to derive the family memberships. They are those of version 6.8.5 of the fully analytical theory by Milani and Knezevic, reported in [MILANI&KNEZEVIC1994]). Asteroids having e' > 0.3 were not included in this analysis." DATA_TYPE = ASCII_REAL START_BYTE = 26 BYTES = 6 FORMAT = "F6.4" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 NAME = "SINE PROPER INCLINATION" DESCRIPTION = "The proper elements recorded in this file are those actually used to derive the family memberships. They are those of version 6.8.5 of the fully analytical theory by Milani and Knezevic, reported in [MILANI&KNEZEVIC1994]). Asteroids having sin(i') > 0.3 were not included in this analysis." DATA_TYPE = ASCII_REAL START_BYTE = 33 BYTES = 6 FORMAT = "F6.4" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 6 NAME = "FAMILY NAME" DESCRIPTION = "The name of the family to which this asteroid belongs. Each family is named after the lowest-numbered member of the family at the nominal level of distance used for family identification. The nominal distance used for family identification is the QRL (quasi-random level) defined as the minimum distance threshold in m/s at which a chance grouping including some minimum number of objects survives. See [ZAPPALAETAL1994] for more details, if needed. If the asteroid is not a member of any family in this analysis, this field is left blank." DATA_TYPE = CHARACTER START_BYTE = 47 BYTES = 25 FORMAT = A25 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 7 NAME = "FAMILY CLUMP FLAG" DESCRIPTION = "This flag indicates whether the grouping is a nominal family (F) or a clump (C), based on the definitions of those categories given in [ZAPPALAETAL1995]." DATA_TYPE = CHARACTER START_BYTE = 73 BYTES = 1 FORMAT = A1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 8 NAME = "CONFIDENCE LEVEL" DESCRIPTION = "A confidence level is assigned to objects belonging to the nominal families (F) only. It is an integer ranging from 1 to 3 based on the following definitions, with 1 corresponding to the lowest level of confidence in the family membership and 3 corresponding to the highest level of confidence. This parameter is the same as the 'quality code' (QC) in [ZAPPALAETAL1994]. QC = 1 refers to objects not belonging to the family at the nominal QRL, but belonging to it at a level of distance equal to QRL+20m/s. QC = 2 refers to objects belonging to the family at the nominal QRL, but not meeting the criterion of QC = 3. QC = 3 refers to objects that belong to the family at the nominal QRL, and are still found to belong to a subgrouping of the family containing at least 2/5 of the total members (found at QRL) at a distance level equal to QRL-20m/s. QRL (quasi-random level) is the nominal level of distance used for family identification, defined as the minimum distance threshold in m/s at which a chance grouping including some minimum number of objects survives. See [ZAPPALAETAL1994] for more details, if needed." DATA_TYPE = ASCII_INTEGER START_BYTE = 77 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN END_OBJECT = TABLE END