CCSD3ZF0000100000001NJPL3IF0PDS200000001 = SFDU_LABEL RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 31 FILE_RECORDS = 2818 DATA_SET_ID = "EAR-A-5-DDR-FAMILY-V1.0" ^TABLE = "FAMILY.TAB" RECORD_FORMAT = "(A5,1X,4(A4,1X),A3)" OBJECT = TABLE ROWS = 2818 ROW_BYTES = 31 INTERCHANGE_FORMAT = ASCII COLUMNS = 6 DESCRIPTION = " Contents: Family identifications for numbered asteroids. The Zappala et al. family identifications are taken from Zappala et al. (1994) rather than from Zappala et al. (1990). In the more recent publication, the families are identified by the catalog number of the lowest numbered member of the family, which represents a change from the earlier paper. At the time of their analysis, the numbered asteroid population totaled 4722 objects. The extension to unnumbered asteroids, which had been assigned unofficial numbers in the range 7000 and above, yielded 718 more family identifications. At the time this file was created, the numbered asteroid population totaled 5856 objects, 235 of which are among those 718 additional objects identified as family members. This file has been updated to reflect the newly assigned catalog numbers. No attempt has been made to indicate the significance level of each object's family identification (partly because this information was not available in machine-readable form). Instead, the user is directed to the reference. In particular, only those asteroids shown below the double horizontal line (neither above nor to the right) in their 'stalactite' diagrams have been tabulated as family members. The Williams family identifications are taken from the Williams (1989) listing, which differs slightly from the Williams (1979) listing. Improved orbits for asteroids 561, 637, 864, 1037, 1265, 1381, and 1686 have to changes in family identifications. More details about the family identification procedure can be found in Williams (1992). The Kozai (1979) families are identified by the two-digit number given in the reference. Both the Carusi and Massaro (1978) families and the Hirayama (1918) families are identified by the first three letters of the lowest numbered member's name. Some of the Carusi and Massaro family identifications include suffixes to indicate members of subfamilies. 'The+' indicates the Erato subfamily of the Themis family, 'Eos+' indicates the Dorothea subfamily of the Eos family, 'Kor+' indicates the Dresda subfamily of the Koronis family, and 'Flo=' and 'Flo/' indicate the Berolina and Iduberga subfamilies of the Flora family, respectively. Family identifications are treated as character data, even when a number is used to identify the family, and are therefore always left- justified in the field. Blank entries indicate either that the object was not considered a family member in the corresponding analysis, or, especially in the case of the higher numbered objects, the object was unknown at the time of the analysis. The file is not intended to represent an exhaustive listing of all family identifications ever performed. In particular, the older analyses of Brouwer (1951), Arnold (1969), van Houten et al. (1970), and Lindblad and Southworth (1971) are not included. They can be added if sufficient interest is demonstrated. The original Hirayama families are provided mainly for historical value. This file was prepared with the assistance of Y. Nozaki and L. N. Phan. References: Arnold, J. R. 1969. Asteroid families and 'jet streams'. Astron. J. 74, 1235-1242. Brouwer, D. 1951. Secular variations of the orbital elements of minor planets. Astron. J. 56, 9-32. Carusi, A., and E. Massaro 1978. Statistics and mapping of asteroid concentrations in the proper elements' space. Astron. Astrophys. Suppl. 34, 81-90. Hirayama, K. 1918. Groups of asteroids probably of common origin. Astron. J. 31, 185-188. Kozai, Y. 1979. The dynamical evolution of the Hirayama family. In Asteroids (T. Gehrels, Ed.), pp. 334-358. Univ. of Arizona Press, Tucson. Lindblad, B. A., and R. B. Southworth 1971. A study of asteroid families and streams by computer techniques. In Physical Studies of Minor Planets (T. Gehrels, Ed.), pp. 337-352. NASA SP-267, U.S. Govt. Printing Office, Washington, D.C. Williams, J. G. 1979. Proper elements and family memberships of the asteroids. In Asteroids (T. Gehrels, Ed.), pp. 1040-1063. Univ. of Arizona Press, Tucson. Williams, J. G. 1989. Asteroid family identifications and proper elements. In Asteroids II (R. P. Binzel, T. Gehrels, and M. S. Matthews, Eds.), pp. 1034-1072. Univ. of Arizona Press, Tucson. Williams, J. G. 1992. Asteroid families--An initial search. Icarus 96, 251-280. van Houten, C. J., I. van Houten-Groeneveld, P. Herget, and T. Gehrels 1970. The Palomar-Leiden survey of faint minor planets. Astron. Astrophys. Suppl. 2, 339-448. Zappala, V., A. Cellino, P. Farinella, and Z. Knezevic 1990. Asteroid families. I. Identification by hierarchical clustering and reliability assessment. Astron. J. 100, 2030-2046. Zappala, V., A. Cellino, P. Farinella, and A. Milani 1994. Asteroid families. II. Extension to unnumbered multiopposition asteroids. Astron. J. 107, 772-801. David J. Tholen 1994 March 16 " OBJECT = COLUMN NAME = "ASTEROID_ID" DESCRIPTION = "Asteroid catalog number." DATA_TYPE = ASCII_INTEGER START_BYTE = 1 BYTES = 5 FORMAT = I5 END_OBJECT = COLUMN OBJECT = COLUMN NAME = "ZAPPALA_FAMILY" DESCRIPTION = "Family identification acording to the Zappala et al. analysis." DATA_TYPE = CHARACTER START_BYTE = 7 BYTES = 4 FORMAT = A4 END_OBJECT = COLUMN OBJECT = COLUMN NAME = "WILLIAMS_FAMILY" DESCRIPTION = "Family identification according to the Williams analysis." DATA_TYPE = CHARACTER START_BYTE = 12 BYTES = 4 FORMAT = A4 END_OBJECT = COLUMN OBJECT = COLUMN NAME = "KOZAI_FAMILY" DESCRIPTION = "Family identification according to the Kozai analysis." DATA_TYPE = CHARACTER START_BYTE = 17 BYTES = 4 FORMAT = A4 END_OBJECT = COLUMN OBJECT = COLUMN NAME = "CARUSI_AND_MASSARO_FAMILY" DESCRIPTION = "Family identification according to the Carusi and Massaro analysis." DATA_TYPE = CHARACTER START_BYTE = 22 BYTES = 4 FORMAT = A4 END_OBJECT = COLUMN OBJECT = COLUMN NAME = "HIRAYAMA_FAMILY" DESCRIPTION = "Family identification according to the Hirayama analysis." DATA_TYPE = CHARACTER START_BYTE = 27 BYTES = 3 FORMAT = A3 END_OBJECT = COLUMN END_OBJECT = TABLE END