PDS_VERSION_ID = PDS3 /* File Characteristics */ RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 84 FILE_RECORDS = 3418 /* Data Object Pointers */ ^TABLE = "MISSED.TAB" /* Identification Keywords */ DATA_SET_ID = "IRAS-A-FPA-3-RDR-IMPS-V4.0" PRODUCT_NAME = "IMPS Missed Predictions File" PRODUCT_ID = "IMPS-MISSED-199803" 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 = 1998-03-23 /* Peer Review Date */ RECORD_FORMAT = "(i4,1x,a15,1x,a13,1x,i2,1x,f5.2,1x,f4.2,1x, f5.3,1x,f7.2,1x,f6.4,1x,f7.2,10(1x,i1))" /* Data Object Descriptions */ OBJECT = TABLE ROWS = 3418 ROW_BYTES = 84 INTERCHANGE_FORMAT = ASCII COLUMNS = 18 DESCRIPTION = "The MISSED.TAB datafile consists of the IRAS Minor Planet Survey Final Product 106, the IMPS Missed-Predictions Data Base. There is an entry for each of 3418 asteroids which were predicted to have crossed the IRAS focal plane array but which were never detected. This file includes the number of times predicted to be scanned but missed, absolute magnitude and slope parameter, estimated visual albedo and diameter, the greatest lower bound on the albedo, the least upper bound on the diameter, and an OR'd prediction status word. There are two versions of the IMPS Missed-Predictions Data Base, an electronic version which includes a 32-bit missed prediction status word (MPStatW), and a hardcopy version reproduced in TEDESCOETAL1992 whose MPStatW is only 16 bits in length. The 16-bit MPStatW is not consistent with its associated documentation, so the 32-bit MPStatW is utilized here. In the original release of the IMPS Missed-Predictions Data Base, a number of 'missed prediction status word (MPStatW)' bits were always set to zero (flag not set) or one (flag set) and have been excluded. For further information regarding these data see TEDESCOETAL1992." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "ASTEROID ID" DESCRIPTION = "IAU asteroid number designation. Complete through number 5838 (MPC 22982, January 27, 1994). For those asteroids unnumbered at that time, this field is blank." DATA_TYPE = ASCII_INTEGER START_BYTE = 1 BYTES = 4 FORMAT = I4 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "ASTEROID NAME" DESCRIPTION = "IAU asteroid name, complete through MPC 22982, January 27, 1994. For asteroids unnamed at that time, this field is blank." DATA_TYPE = CHARACTER START_BYTE = 6 BYTES = 15 FORMAT = A15 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = "ASTEROID PROVISIONAL DESIGNATION" DESCRIPTION = "Asteroid principal provisional designation. For numbered asteroids, this field may be blank." DATA_TYPE = CHARACTER START_BYTE = 22 BYTES = 13 FORMAT = A13 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = "NUMBER MISSED PREDICTIONS" DESCRIPTION = "The number of times an asteroid was predicted to have crossed the IRAS focal plane array, but which failed to be detected." DATA_TYPE = ASCII_INTEGER START_BYTE = 36 BYTES = 2 FORMAT = I2 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 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 = 39 BYTES = 5 FORMAT = "F5.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 6 NAME = "ASSUMED SLOPE PARAMETER" DESCRIPTION = "Value assumed for the slope parameter G of the asteroid in the derivation of the albedo." UNIT = "MAGNITUDE" DATA_TYPE = ASCII_REAL START_BYTE = 45 BYTES = 4 FORMAT = "F4.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 7 NAME = "GREATEST LOWER ALBEDO LIMIT" DESCRIPTION = "For each predicted observation, a lower albedo limit was calculated using the ASSUMED ABSOLUTE MAGNITUDE and ASSUMED SLOPE PARAMETER using a standard 5-sigma noise flux of 0.7 Jy (3.6e-14 W/m^2) in the 25 micron channel. Of these, the predicted observation yielding the greatest albedo (and lowest diameter) was chosen." UNIT = "KILOMETER" DATA_TYPE = ASCII_REAL START_BYTE = 50 BYTES = 6 FORMAT = "F6.4" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 8 NAME = "LEAST UPPER DIAMETER LIMIT" DESCRIPTION = "For each predicted observation, an upper diameter limit was calculated using the ASSUMED ABSOLUTE MAGNITUDE and ASSUMED SLOPE PARAMETER using a standard 5-sigma noise flux of 0.7 Jy (3.6e-14 W/m^2) in the 25 micron channel. Of these, the predicted observation yielding the lowest diameter (and greatest albedo) was chosen." UNIT = "KILOMETER" DATA_TYPE = ASCII_REAL START_BYTE = 57 BYTES = 7 FORMAT = "F7.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 9 NAME = "MISSED PREDICTION STATUS WORD 03" DESCRIPTION = "Set when the galactic latitude within 10 degrees of the galactic plane." DATA_TYPE = ASCII_INTEGER START_BYTE = 65 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 10 NAME = "MISSED PREDICTION STATUS WORD 04" DESCRIPTION = "Galactic center match. Asteroid 25 micron only sightings were rejected by IMPS if they were near the galactic center: set when galactic latitude within 3 degrees of galactic plane and galactic longitude is +/- 10 degrees. This is a subset of MISSED PREDICTION STATUS WORD 3." DATA_TYPE = ASCII_INTEGER START_BYTE = 67 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 11 NAME = "MISSED PREDICTION STATUS WORD 09" DESCRIPTION = "Dead 25 micron detector. Set when predicted position scanned by a dead 25 micron detector." DATA_TYPE = ASCII_INTEGER START_BYTE = 69 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 12 NAME = "MISSED PREDICTION STATUS WORD 10" DESCRIPTION = "Noisy 25 micron detector. Set when predicted position scanned by a noisy 25 micron detector." DATA_TYPE = ASCII_INTEGER START_BYTE = 71 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 13 NAME = "MISSED PREDICTION STATUS WORD 11" DESCRIPTION = "Zodiacal albedo not converged. Set if the albedo iteration did not converge for this particular missed prediction." DATA_TYPE = ASCII_INTEGER START_BYTE = 73 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 14 NAME = "MISSED PREDICTION STATUS WORD 15" DESCRIPTION = "SOP 599 or 600. Through an oversight, asteroid processing was off for the last two SATELLITE OPERATION PLAN cycles (SOP 599 and 600). Set if a predicted scan fell within this time period." DATA_TYPE = ASCII_INTEGER START_BYTE = 75 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 15 NAME = "MISSED PREDICTION STATUS WORD 16" DESCRIPTION = "Predicted sighting conflict. Set if more than one source is associated with a single asteroid prediction and therefore is rejected." DATA_TYPE = ASCII_INTEGER START_BYTE = 77 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 16 NAME = "MISSED PREDICTION STATUS WORD 17" DESCRIPTION = "Set when ALL predicted sightings of an asteroid were in the last two SOPs (see MISSED PREDICTION STATUS WORD 15)." DATA_TYPE = ASCII_INTEGER START_BYTE = 79 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 17 NAME = "MISSED PREDICTION STATUS WORD 19" DESCRIPTION = "Disconnected association. Set when a prediction was matched with a detection, but later disconnected." DATA_TYPE = ASCII_INTEGER START_BYTE = 81 BYTES = 1 FORMAT = I1 END_OBJECT = COLUMN END_OBJECT = TABLE END