CCSD3ZF0000100000001NJPL3IF0PDSX00000001 = SFDU PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 94 FILE_RECORDS = 47 ^TABLE = "IRPHOT1A.TAB" DATA_SET_ID = "EAR-C-IRPHOT-2-RDR-HALLEY-ADDENDA-V1.0" TARGET_NAME = "HALLEY" PRODUCT_ID = "IRPHOT1A.TAB" PRODUCT_NAME = "0.7- to 23-MICROMETER PHOTOMETRIC Observation Parameters" PRODUCT_CREATION_TIME = 1997-02-21 START_TIME = 1985-12-12 STOP_TIME = 1986-05-06 INSTRUMENT_NAME = "N/A" OBJECT = TABLE INTERCHANGE_FORMAT = ASCII ROWS = 47 COLUMNS = 18 ROW_BYTES = 94 DESCRIPTION = "This file lists the observation parameters for each of the data files referenced." NOTE = "A blank field indicates the associated data were not available." OBJECT = COLUMN NAME = "OBS NUMBER" COLUMN_NUMBER = 1 DATA_TYPE = ASCII_INTEGER START_BYTE = 1 BYTES = 2 FORMAT = "I2" DESCRIPTION = " OBS NUMBER = Chronological observation number" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "UT DAY" COLUMN_NUMBER = 2 DATA_TYPE = ASCII_REAL START_BYTE = 4 BYTES = 5 FORMAT = "F5.2" DESCRIPTION = " UT DAY = UT observation day" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "UT MONTH" COLUMN_NUMBER = 3 DATA_TYPE = ASCII_INTEGER START_BYTE = 10 BYTES = 2 FORMAT = "I2" DESCRIPTION = " UT MONTH = UT observation month" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "UT YEAR" COLUMN_NUMBER = 4 DATA_TYPE = ASCII_INTEGER START_BYTE = 13 BYTES = 2 FORMAT = "I2" DESCRIPTION = " UT YEAR = Last 2 digits of the UT observation year" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "JD" COLUMN_NUMBER = 5 UNIT = "JULIAN DAYS" DATA_TYPE = ASCII_REAL START_BYTE = 16 BYTES = 7 FORMAT = "F7.2" DESCRIPTION = " JD = Julian date of the observation: 2,440,000+" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "DAYS FROM PERIHELION" COLUMN_NUMBER = 6 UNIT = "DAYS" DATA_TYPE = ASCII_REAL START_BYTE = 24 BYTES = 6 FORMAT = "F6.2" DESCRIPTION = " DAYS FROM PERIHELION = UT time of each observation in decimal days with respect to perihelion passage (t=0): negative values = pre-perihelion positive values = post-perihelion" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "OBS SYSTEM" COLUMN_NUMBER = 7 DATA_TYPE = CHARACTER START_BYTE = 31 BYTES = 4 FORMAT = "A4" DESCRIPTION = " OBS SYSTEM = Photometric system used for the observation: MLOF = UM Mount Lemmon Observing Facility 1.52-m telescope UM2 = UM O'Brien 0.76-m telescope WIRO = Wyoming Infrared Observatory" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "R" COLUMN_NUMBER = 8 UNIT = "AU" DATA_TYPE = ASCII_REAL START_BYTE = 36 BYTES = 4 FORMAT = "F4.2" DESCRIPTION = " R = Heliocentric distance in AU" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "DELTA R" COLUMN_NUMBER = 9 UNIT = "AU" DATA_TYPE = ASCII_REAL START_BYTE = 41 BYTES = 4 FORMAT = "F4.2" DESCRIPTION = " DELTA R = Geoocentric distance change in AU" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SCALE FACTOR" COLUMN_NUMBER = 10 DATA_TYPE = ASCII_REAL START_BYTE = 46 BYTES = 4 FORMAT = "F4.2" DESCRIPTION = " SCALE FACTOR = Multiplier to correct observed coma emission to R = 1 and DELTA R = 1: R^-4 * DELTA R^-1" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "ELONGATION ANGLE" COLUMN_NUMBER = 11 UNIT = "DEGREES" DATA_TYPE = ASCII_REAL START_BYTE = 51 BYTES = 5 FORMAT = "F5.1" DESCRIPTION = " ELONGATION ANGLE = Sun-Earth-Comet elongation angle" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SCATTERING ANGLE" COLUMN_NUMBER = 12 UNIT = "DEGREES" DATA_TYPE = ASCII_REAL START_BYTE = 57 BYTES = 5 FORMAT = "F5.1" DESCRIPTION = " SCATTERING ANGLE = Sun-Comet-Earth scattering angle" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "PHASE ANGLE" COLUMN_NUMBER = 13 UNIT = "DEGREES" DATA_TYPE = ASCII_REAL START_BYTE = 63 BYTES = 4 FORMAT = "F4.1" DESCRIPTION = " PHASE ANGLE = 180 degrees - SCATTERING ANGLE" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "BEAM DIAMETER" COLUMN_NUMBER = 14 UNIT = "ARCSEC" DATA_TYPE = ASCII_REAL START_BYTE = 68 BYTES = 4 FORMAT = "F4.1" DESCRIPTION = " BEAM DIAMETER = Equivalent circular diameter for phototmeters with square beams" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "CHOPPER THROW" COLUMN_NUMBER = 15 UNIT = "ARCSEC" DATA_TYPE = ASCII_REAL START_BYTE = 73 BYTES = 4 FORMAT = "F4.1" DESCRIPTION = " CHOPPER THROW = Chopper throw between the source and reference beams" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "REFERENCE BEAM MULTIPLIER" COLUMN_NUMBER = 16 DATA_TYPE = ASCII_REAL START_BYTE = 78 BYTES = 4 FORMAT = "F4.2" DESCRIPTION = " REFERENCE BEAM MULTIPLIER = Corrects for coma emission in reference beam: 4*CHOPPER THROW/(4*CHOPPER THROW - BEAM DIAMETER" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "BEAM DIAMETER MULTPLIER" COLUMN_NUMBER = 17 DATA_TYPE = ASCII_REAL START_BYTE = 83 BYTES = 4 FORMAT = "F4.2" DESCRIPTION = " BEAM DIAMETER MULTIPLIER = Normalizes coma emission to circular diaphragm of 20-arcsec diameter: 20/BEAM DIAMETER" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "STANDARD BEAM MULTIPLIER" COLUMN_NUMBER = 18 DATA_TYPE = ASCII_REAL START_BYTE = 88 BYTES = 4 FORMAT = "F4.2" DESCRIPTION = " STANDARD BEAM MULTIPLIER = Multiplier giving the coma emission in a standard beam of 20-arcsec diameter corrected for emission into the reference beam: BEAM DIAMETER MULTIPLIER * STANDARD BEAM MULTIPLIER" END_OBJECT = COLUMN END_OBJECT = TABLE END