PDS_VERSION_ID = PDS3 /* File Characteristics */ RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 98 FILE_RECORDS = 120 /* Data Object Pointers */ ^TABLE = "single.tab" /* Identification Keywords */ DATA_SET_ID = "IRAS-A-FPA-3-RDR-IMPS-V3.0" PRODUCT_NAME = "IMPS Singleton File" PRODUCT_ID = "IMPS-SINGLE-199703" INSTRUMENT_HOST_NAME = "INFRARED ASTRONOMICAL SATELLITE" INSTRUMENT_NAME = "FOCAL PLANE ARRAY" TARGET_NAME = ASTEROID START_TIME = 1983-01 STOP_TIME = 1983-11 PRODUCT_CREATION_TIME = 1997-03-24 /* Peer Review Date */ RECORD_FORMAT = "(a5,1x,a18,1x,a9,1x,f5.2,1x,f6.4,1x,f5.3, 1x,f5.2,1x,f3.1,1x,f4.2,14(1x,i1))" /* Data Object Descriptions */ OBJECT = TABLE ROWS = 120 ROW_BYTES = 98 INTERCHANGE_FORMAT = ASCII COLUMNS = 23 DESCRIPTION = "The SINGLE.TAB datafile consists of the IRAS Minor Planet Survey Final Product 103, the IMPS Singleton Catalog. There is an entry for each of 120 asteroids for which there is an accepted sighting, but in one band only. This file includes the absolute visual magnitude of the asteroid, the albedo and diameter derived from the measurement and their associated uncertainties, and the accepted status word. In the original release of the IMPS Singleton Catalog, several parameters were always equal to a single value and have been excluded here. These included: PLC - The probability that lightcurve affected the results was always given as zero. US - The number of sightings used in the calculation of the albedo and diameter in this file, which is always unity. UO - The number of observations used is always equal to one. In addition, a number of 'asteroid status word (ASTATW)' bits were always set to zero (flag not set) or one (flag set) and have been excluded here, these were: ASTATW 5 - WSDB MCON position match. All MCON (WSDB 'weeks' or months confirmed) asteroid sightings are rejected by IMPS. These sightings are likely to be confused with stationary background sources (e.g. molecular clouds, galaxies, knots of infrared cirrus). See ASTATW 9. No accepted detections had flag set. ASTATW 6 - Small scale Version 1 match. Set to indicate coincidence with resolved spatial structure. See HELOU&WALKER1986. No associations with singletons. ASTATW 8 - IMPS asteroid association. Set to unity for every accepted asteroid sighting, therefore the flag is always one in this file by definition. ASTATW 9 - Point Source Ver. 2 match. All asteroid sightings confused with sources in the IRAS Point Source Catalog are rejected by IMPS. This is a subset of ASTATW 5. ASTATW 10 - Detections only by small detectors on the outer edge of the focal plane array. No accepted detections had this flag set. ASTATW 11 - Predicted flux < 0.14 Jy. Set a priori for all candidate associations of an IMPS asteroid if no predicted flux density at 25 microns is greater than 0.14 Jansky. No detections were accepted when this flag was set. ASTATW 13 - Set to unity when 12 micron albedo used in the final average albedo. Since all singleton observations are at 25 microns, this value is always zero. ASTATW 14 - Set to unity when 25 micron albedo used in the final average albedo. Since all singleton observations are at 25 microns, this value is always unity. ASTATW 15 - Set to unity when 60 micron albedo used in the final average albedo. Since all singleton observations are at 25 microns, this value is always zero. ASTATW 16 - Set to unity when 100 micron albedo used in the final average albedo. Since all singleton observations are at 25 microns, this value is always zero. ASTATW 17 - Faint Source Version 2 match. All asteroid sightings confused with sources in the IRAS Faint Source Survey are rejected by IMPS (See MOSHIRETAL1992), therefore this flag is always zero in this data file. ASTATW 19 - Large albedo range. Set for all sightings of an accepted asteroid if the ratio {[max - min]/[min + max]/2} is greater than 0.75 among all derived albedos used in the final average for each asteroid. Albedos in this file are derived from a single observation, therefore this flag is always set to zero. ASTATW 20 - Serendipitous Version 1 match. All asteroid sightings confused with sources in the IRAS Serendipitous Survey Catalog are rejected by IMPS (See KLEINMANETAL1986), therefore this flag is always set to zero in this data file. ASTATW 23 - ADAS type 2 now type 1. Set if provisional asteroid elements updated and numbered since 1985. This value is always zero in the original singleton catalog and has therefore been excluded. ASTATW 29 - Not used. Always zero. ASTATW 30 - 2+ known asteroid match. Set if sighting is associated with more than one asteroid prediction. This value is always zero in the original singleton catalog and has therefore been excluded. ASTATW 31 - 2+ sightings match. Set if more than one source is associated with a single asteroid prediction and therefore rejected by IMPS. No detections were accepted in this file when this flag was set. ASTATW 32 - Not used. Always zero. For further information regarding these data see TEDESCOETAL1992." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "ASTEROID ID" DESCRIPTION = "The IAU asteroid number designation. For unnumbered asteroids, this field is blank." DATA_TYPE = CHARACTER START_BYTE = 1 BYTES = 5 FORMAT = A5 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "ASTEROID NAME" DESCRIPTION = "IAU asteroid name. For unnamed asteroids, this field is blank." DATA_TYPE = CHARACTER START_BYTE = 7 BYTES = 18 FORMAT = A18 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = "ASTEROID PROVISIONAL DESIGNATION" DESCRIPTION = "Asteroid principal provisional designation. For named asteroids, this field is blank." DATA_TYPE = CHARACTER START_BYTE = 26 BYTES = 9 FORMAT = A9 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = "ASSUMED ABSOLUTE MAGNITUDE" DESCRIPTION = "Value assumed for absolute visual magnitude H of the asteroid in the derivation of the albedo." UNIT = "MAGNITUDE" DATA_TYPE = ASCII_REAL START_BYTE = 36 BYTES = 5 FORMAT = "F5.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 NAME = "MEAN ALBEDO" DESCRIPTION = "The average of geometric albedos derived from assumed values of H and G and each IRAS observation (scaled to zero phase)." DATA_TYPE = ASCII_REAL START_BYTE = 42 BYTES = 6 FORMAT = "F6.4" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 6 NAME = "MEAN ALBEDO SIGMA" DESCRIPTION = "One sigma uncertainty in mean geometric albedo. In the case of the Singleton file this corresponds solely to the measured uncertainties in the IRAS photometry." DATA_TYPE = ASCII_REAL START_BYTE = 49 BYTES = 5 FORMAT = "F5.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 7 NAME = "EFFECTIVE DIAMETER" DESCRIPTION = "Radiometric diameter derived from the mean geometric albedo and the assumed value of H." UNIT = "KILOMETER" DATA_TYPE = ASCII_REAL START_BYTE = 55 BYTES = 5 FORMAT = "F5.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 8 NAME = "EFFECTIVE DIAMETER SIGMA" DESCRIPTION = "One sigma uncertainty in effective diameter, set so that its relative uncertainty is half that of the mean geometric albedo." UNIT = "KILOMETER" DATA_TYPE = ASCII_REAL START_BYTE = 61 BYTES = 3 FORMAT = "F3.1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 9 NAME = "FRACTION OBSERVED RATIO" DESCRIPTION = "The ratio of the number of times the asteroid was predicted to cross the IRAS focal plane to the number of crossings detected." DATA_TYPE = ASCII_REAL START_BYTE = 65 BYTES = 4 FORMAT = "F4.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 10 NAME = "ASTEROID STATUS WORD 01" DESCRIPTION = "Low position score. This flag is set to unity when the difference between the predicted and the observed positions for an asteroid's association is deemed significant (POSITION_SCORE<0.5) (TEDESCOETAL1992, p. 88)." DATA_TYPE = ASCII_INTEGER START_BYTE = 70 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 11 NAME = "ASTEROID STATUS WORD 02" DESCRIPTION = "ADAS type 1 accept. Set for all sightings of an asteroid with ASTEROID_ID value less than 3318 which was accepted in the Asteroid Data Analysis Subsystem (see MATSON1986)." DATA_TYPE = ASCII_INTEGER START_BYTE = 72 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 12 NAME = "ASTEROID STATUS WORD 03" DESCRIPTION = "ADAS type 1 reject. Set for all sightings of an asteroid with ASTEROID_ID value less than 3318 which was rejected in the Asteroid Data Analysis Subsystem (see MATSON1986)." DATA_TYPE = ASCII_INTEGER START_BYTE = 74 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 13 NAME = "ASTEROID STATUS WORD 04" DESCRIPTION = "WSDB HCON position match. Set for an hours confirmed asteroid sighting, which was not confirmed when the position was scanned weeks or months later (hence rejected from the IRAS Working Survey Data Base - see MATSON1986)." DATA_TYPE = ASCII_INTEGER START_BYTE = 76 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 14 NAME = "ASTEROID STATUS WORD 07" DESCRIPTION = "Relative flux out of bounds. Set if the ratio of observed to predicted flux density at 25 microns is either less than 0.3 or greater than 3.0." DATA_TYPE = ASCII_INTEGER START_BYTE = 78 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 15 NAME = "ASTEROID STATUS WORD 12" DESCRIPTION = "Low detection rate FOR. Set for all sightings of each asteroid if the rate of successful detections, i.e., the fraction observed ratio FOR [(number of sightings used)/(number used plus number missed)], is less than 0.3." DATA_TYPE = ASCII_INTEGER START_BYTE = 80 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 16 NAME = "ASTEROID STATUS WORD 18" DESCRIPTION = "Accepted observation having no 25 micron flux density greater than 1 Jansky." DATA_TYPE = ASCII_INTEGER START_BYTE = 82 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 17 NAME = "ASTEROID STATUS WORD 21" DESCRIPTION = "-10 degrees < GALACTIC_LATITUDE < 10 degrees. Set if sighting is within the galactic plane, i.e. not covered by the IRAS Faint Source Survey. See ASTEROID_STATUS_WORD_17." DATA_TYPE = ASCII_INTEGER START_BYTE = 84 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 18 NAME = "ASTEROID STATUS WORD 22" DESCRIPTION = "Galactic center match. Asteroid 25 micron only sightings are rejected by IMPS if near the galactic center: +/- 3 degrees latitude by +/- 10 degrees longitude. Subset of ASTEROID_STATUS_WORD_21." DATA_TYPE = ASCII_INTEGER START_BYTE = 86 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 19 NAME = "ASTEROID STATUS WORD 24" DESCRIPTION = "Flux correction used. Set if IMPS decreased (low) flux densities to compensate for IRAS bias near its SNR cutoff." DATA_TYPE = ASCII_INTEGER START_BYTE = 88 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 20 NAME = "ASTEROID STATUS WORD 25" DESCRIPTION = "12 micron high density. Set if sighting is within an IRAS 12 micron High Source Density Region near the galactic center. See ASTEROID_STATUS_WORD_26." DATA_TYPE = ASCII_INTEGER START_BYTE = 90 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 21 NAME = "ASTEROID STATUS WORD 26" DESCRIPTION = "25 micron high density. Set if sighting is within an IRAS 25 micron High Source Density Region near the galactic center. See ASTEROID_STATUS_WORD_25." DATA_TYPE = ASCII_INTEGER START_BYTE = 92 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 22 NAME = "ASTEROID STATUS WORD 27" DESCRIPTION = "60 micron high density. Set if sighting is within an IRAS 60 micron High Source Density Region of low galactic latitude near the center and anti-center." DATA_TYPE = ASCII_INTEGER START_BYTE = 94 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 23 NAME = "ASTEROID STATUS WORD 28" DESCRIPTION = "100 micron high density. Set if sighting is within an IRAS 100 micron High Source Density Region around the galactic center and anti-center." DATA_TYPE = ASCII_INTEGER START_BYTE = 96 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN END_OBJECT = TABLE END