PDS_VERSION_ID = PDS3 /* File Characteristics */ RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 66 FILE_RECORDS = 111 /* Data Object Pointers */ ^TABLE = "polar.tab" /* Identification Keywords */ DATA_SET_ID = "EAR-A-3-RDR-TRIAD-POLARIMETRY-V2.0" PRODUCT_NAME = "TRIAD Polarimetry Table" PRODUCT_ID = "POLAR-POLAR-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 = "(1x,i5,1x,f4.2,2x,i1,1x,2(a1,3x,f4.1, 2x,i1,2x,f5.3,2x,i1,1x),i5)" /* Data Object Descriptions */ OBJECT = TABLE ROWS = 111 ROW_BYTES = 66 INTERCHANGE_FORMAT = ASCII COLUMNS = 14 DESCRIPTION = "This data set contains the asteroid polarimetry data of the TRIAD database, originally reported in Asteroids (T. Gehrels, Ed., University of Arizona Press, Tucson, 1979). Only the reduced values of the polarization curve, namely minimum polarization, inversion angle, and polarimetric slope, are included in the TRIAD database. For polarization results for which the entire polarization curve is available, see the Asteroid Polarimetry Database, compiled by Dmitrij Lupishko of Kharkov University and included in PDS in the file 'apd.tab'. This data set was updated in 1997 to correct an error in the unit of one parameter. The parameter 'MINIMUM POLARIZATION' was previously listed as in degrees, and was corrected to percent." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "ASTEROID NUMBER" DESCRIPTION = "Asteroid catalog number." DATA_TYPE = ASCII_INTEGER START_BYTE = 2 BYTES = 5 FORMAT = I5 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "MINIMUM POLARIZATION" DESCRIPTION = "Minimum value of polarization curve in percent. This value was typically measured using the combined data from all filters used in the observing program." UNIT = PERCENT DATA_TYPE = ASCII_REAL START_BYTE = 8 BYTES = 4 FORMAT = "F4.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = "MINIMUM POLARIZATION QUALITY CODE" DESCRIPTION = "A single-digit indication of the quality of the data. The quality code was described in [MORRISON&ZELLNER1979] as follows: 'Quality code 1 means fragmentary data; e.g, a single observation or a result predating the high-quality surveys of recent years. Quality 2 applies to reliable, confirmed observations, and quality 3 is used for results that could hardly be improved." DATA_TYPE = ASCII_INTEGER START_BYTE = 14 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = "FILTER ONE" DESCRIPTION = "The filter through which the data given in fields 5-8 were taken. The filter codes with their approximate effective wavenumbers (in micron^-1) are given here: B = Blue, 2.30. G = Green, 1.93. V = Visual, 1.79. X indicates no filter was used." DATA_TYPE = CHARACTER START_BYTE = 16 BYTES = 1 FORMAT = A1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 NAME = "INVERSION ANGLE ONE" DESCRIPTION = "The angle at which the polarization changes sign, in degrees, for filter 1." UNIT = DEGREE DATA_TYPE = ASCII_REAL START_BYTE = 20 BYTES = 4 FORMAT = "F4.1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 6 NAME = "INVERSION ANGLE ONE QUALITY CODE" DESCRIPTION = "A single-digit quality code referring to the inversion angle as measured in filter 1. The quality code was described in [MORRISON&ZELLNER1979] as follows: 'Quality code 1 means fragmentary data; e.g., a single observation or a result predating the high-quality surveys of recent years. Quality code 2 applies to reliable, confirmed observations, and quality code 3 is used for results that could hardly be improved.'" DATA_TYPE = ASCII_INTEGER START_BYTE = 26 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 7 NAME = "POLARIMETRIC SLOPE ONE" DESCRIPTION = "The slope of the ascending branch of the polarimetry curve, measured at the inversion point, for filter 1. Units are percent per degree." UNIT = "PERCENT PER DEGREE" DATA_TYPE = ASCII_REAL START_BYTE = 29 BYTES = 5 FORMAT = "F5.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 8 NAME = "POLARIMETRIC SLOPE ONE CODE" DESCRIPTION = "Quality code for polarimetric slope for filter 1. The quality code is described in [MORRISON&ZELLNER1979] as follows: 'Quality code 1 means fragmentary data; e.g., a single observation or a result predating the high-quality surveys of recent years. Quality 2 applies to reliable, confirmed observations, and quality code 3 is used for results that could hardly be improved.'" DATA_TYPE = ASCII_INTEGER START_BYTE = 36 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 9 NAME = "FILTER TWO" DESCRIPTION = "The filter through which the data given in fields 10-13 were taken. The filter codes with their approximate effective wavenumbers (in micron^-1) are given here: B = Blue, 2.30. G = Green, 1.93. V = Visual, 1.79. X indicates no filter was used." DATA_TYPE = CHARACTER START_BYTE = 38 BYTES = 1 FORMAT = A1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 10 NAME = "INVERSION ANGLE TWO" DESCRIPTION = "The angle at which the polarization changes sign, in degrees, for filter 2." UNIT = DEGREE DATA_TYPE = ASCII_REAL START_BYTE = 42 BYTES = 4 FORMAT = "F4.1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 11 NAME = "INVERSION ANGLE TWO QUALITY CODE" DESCRIPTION = "A single-digit quality code referring to the inversion angle as measured in filter 2. The quality code was described in [MORRISON&ZELLNER1979] as follows: 'Quality code 1 means fragmentary data; e.g., a single observation or a result predating the high-quality surveys of recent years. Quality code 2 applies to reliable, confirmed observations, and quality code 3 is used for results that could hardly be improved.'" DATA_TYPE = ASCII_INTEGER START_BYTE = 48 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 12 NAME = "POLARIMETRIC SLOPE TWO" DESCRIPTION = "The slope of the ascending branch of the polarimetry curve, measured at the inversion point, for filter 2. Units are percent per degree." UNIT = "PERCENT PER DEGREE" DATA_TYPE = ASCII_REAL START_BYTE = 51 BYTES = 5 FORMAT = "F5.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 13 NAME = "POLARIMETRIC SLOPE TWO CODE" DESCRIPTION = "Quality code for polarimetric slope for filter 2. The quality code is described in [MORRISON&ZELLNER1979] as follows: 'Quality code 1 means fragmentary data; e.g., a single observation or a result predating the high-quality surveys of recent years. Quality 2 applies to reliable, confirmed observations, and quality code 3 is used for results that could hardly be improved.'" DATA_TYPE = ASCII_INTEGER START_BYTE = 58 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 14 NAME = "REFERENCE CODE" DESCRIPTION = "A code for the reference for the original source of the data. This code is the same used in the Cunningham Minor Planet Index to Scientific Papers, included in the PDS SBN data set REFS.TAB. For the polarimetry data, the references cited are as follows: 11870 - Zellner, B., and J. Gradie 1976. Minor planets and related objects. XX. Polarimetric indications of albedo and composition for 94 asteroids. Astron. J. 81, 262-280. 11871 - Zellner, B., and J. Gradie 1976. Polarization of the reflected light of asteroid 433 Eros. Icarus 28, 117-123. 11037 - Veverka, J. 1973. Observations of 9 Metis, 15 Eunomia, 89 Julia, and other asteroids. Icarus 19, 114-117. Data re-reduced by Zellner and presented in Morrison, D. and B. Zellner 1979. Polarimetry and radiometry of asteroids. In Asteroids (T. Gehrels, Ed.), pp. 1090-1097. University of Arizona Press, Tucson. 30000 - Unpublished, University of Arizona." DATA_TYPE = ASCII_INTEGER START_BYTE = 60 BYTES = 5 FORMAT = I5 END_OBJECT = COLUMN END_OBJECT = TABLE END