PDS_VERSION_ID = PDS3 /* File Characteristics */ RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 54 FILE_RECORDS = 58092 /* Data Object Pointers */ ^TABLE = "ASTERMAG.TAB" /* Identification Keywords */ DATA_SET_ID = "EAR-A-5-DDR-ASTERMAG-V7.0" PRODUCT_NAME = "Asteroid Magnitudes and Slopes V7.0" PRODUCT_ID = "ASTERMAG-ASTERMAG-200305" INSTRUMENT_HOST_NAME = "PUBLISHED LITERATURE" INSTRUMENT_NAME = "LITERATURE COMPILATION" TARGET_NAME = ASTEROID PRODUCT_CREATION_TIME = 2003-05-29 /* Peer Review Date */ START_TIME = 1990-12-02 STOP_TIME = 2003-03-18 /* Data Object Descriptions */ OBJECT = TABLE ROWS = 58092 ROW_BYTES = 54 INTERCHANGE_FORMAT = ASCII COLUMNS = 6 DESCRIPTION = " IAU-adopted magnitude parameters (absolute V magnitude and slope parameter) for all numbered asteroids. This version of the dataset contains magnitude parameters for all asteroids numbered as of the 2003 March 18 batch of Minor Planet Circulars and includes 58092 entries. The absolute magnitude database underwent a major revision recently, with updated values being published on Minor Planet Circulars 28104 through 28116. Known errors were corrected at that time, and magnitude parameters that had been taken from the literature for previous versions of the PDS database became formally adopted. Although the updated list as published in the Minor Planet Circulars includes values for all asteroids numbered as of that time, many were not changed from the previously published list. For purposes of this database, unchanged magnitude parameters retain their original reference, which should make it easier for the user to determine which have been updated. " OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "ASTEROID ID" DATA_TYPE = ASCII_INTEGER START_BYTE = 1 BYTES = 6 FORMAT = I6 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "ASTEROID NAME" DATA_TYPE = CHARACTER START_BYTE = 8 BYTES = 17 FORMAT = A17 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = "ABSOLUTE V MAGNITUDE" UNIT = "MAGNITUDE" DESCRIPTION = " The absolute magnitude is variously given to 0.01, 0.1, or 1.0 mag precision, depending on the accuracy and consistency of the data used to arrive at the value. " DATA_TYPE = ASCII_REAL START_BYTE = 26 BYTES = 5 FORMAT = "F5.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = "SLOPE PARAMETER" DESCRIPTION = " Those slope parameters that were determined by fitting the IAU-adopted phase function to data are given an origin code letter of 'f' (for 'fitted'); all others are given a code letter of 'a' (for 'assumed'). The default value is 0.15 in all cases. Note that because most absolute magnitudes are based on apparent magnitudes measured at non-zero phase angles, the value of the absolute magnitude does depend on the assumed value for the slope parameter. A change in the assumed value of the slope parameter (based on a taxonomic classification, for example) should not be made independently of the absolute magnitude. " DATA_TYPE = ASCII_REAL START_BYTE = 32 BYTES = 5 FORMAT = "F5.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 NAME = "SLOPE PARAMETER ORIGIN FLAG" DESCRIPTION = " Those slope parameters that were determined by fitting the IAU-adopted phase function to data are given an origin code letter of 'f' (for 'fitted'); all others are given a code letter of 'a' (for 'assumed'). " DATA_TYPE = CHARACTER START_BYTE = 38 BYTES = 1 FORMAT = A1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 6 NAME = "REFERENCE" DESCRIPTION = " 'MPC' in the reference field stands for 'Minor Planet Circular', published on behalf of Commission 20 of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138. " DATA_TYPE = CHARACTER START_BYTE = 40 BYTES = 13 FORMAT = A13 END_OBJECT = COLUMN END_OBJECT = TABLE END