PDS_VERSION_ID = PDS3 /* File Characteristics */ RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 80 FILE_RECORDS = 184 /* Data Object Pointers */ ^TABLE = "trom23er.tab" /* Identification Keywords */ DATA_SET_ID = "EAR-A-5-DDR-PROPER-ELEMENTS-V1.0" PRODUCT_NAME = "Proper Element Instabilities - Trojans" PRODUCT_ID = "PROPEL-TROM23ER-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 = "(i8,2x,a13,1x,i4,1x,i4,1x,i5,1x,i5,1x,i4,1x, i5,1x,i6,1x,i5,1x,f5.2,1x,i2)" /* Data Object Descriptions */ OBJECT = TABLE ROWS = 184 ROW_BYTES = 80 INTERCHANGE_FORMAT = ASCII COLUMNS = 12 DESCRIPTION = "The file (trom23pr.tab) contains the proper elements for 184 Trojan asteroids computed by Milani, version 2.3. The file trom23er.tab contains the instabilities of the same elements, as computed by the running box test. This consists of a running box of length 500,000 years, moved by steps of 50,000 years over the full span of integration, resulting in 11 separate computations for the proper elements. For the 5 My integrations, the box was 2.5 My long and the shifts were 250,000 years. The value tabulated as an indicator of stability is the difference between the maximum and minimum of the 11 values thus obtained. That value generally corresponds to about 2 x SQRT(2) times the rms mean value of the changes with respect to the mean value. See Milani (1993), Celestial Mechanics 57, 59-94, and Milani (1994), 'Asteroids comets Meteors 1993' (Milani, Di Martino and Cellino, Eds., Kluwer) 159-174 for a detailed description of the analysis." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "ASTEROID NUMBER" DESCRIPTION = "For numbered asteroids, this number is the asteroid catalog number. For unnumbered asteroids, a code number is used of the following format. For survey asteroids, nnnn00ss where nnnn is the survey catalog number and ss is the code for the survey (1=PLS, 2=T1, 3=T2, and 4=T3). For non-survey asteroids, aabbccdd where 19aa is the discovery year, bb and cc encode the two letters of the designation (A=1, B=2, etc.) and dd is the further numeric code. E.g. 1992 CD4 is coded by 92030404." DATA_TYPE = ASCII_INTEGER START_BYTE = 1 BYTES = 8 FORMAT = I8 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "ASTEROID ALTERNATE DESIGNATION" DESCRIPTION = "This field contains one or more alternate designations of the asteroid." DATA_TYPE = CHARACTER START_BYTE = 11 BYTES = 13 FORMAT = A13 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = "TEMPORARY ID NUMBER" DESCRIPTION = "Asteroid temporary ID number." DATA_TYPE = ASCII_INTEGER START_BYTE = 25 BYTES = 4 FORMAT = I4 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = "SEMIMAJOR AXIS AMPLITUDE EXCURSION" DESCRIPTION = "Excursion of the proper amplitude of oscillation in semi-major axis, da, resulting from the running box test. Values given in 1E-5 AU." UNIT = "1E-5 ASTRONOMICAL UNIT" DATA_TYPE = ASCII_INTEGER START_BYTE = 30 BYTES = 4 FORMAT = I4 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 NAME = "MEAN LONGITUDE AMPLITUDE EXCURSION" DESCRIPTION = "Excursion of the proper amplitude of oscillation in mean longitude, D, resulting from the running box test. Values given in 1E-3 degrees." UNIT = "1E-3 DEGREE" DATA_TYPE = ASCII_INTEGER START_BYTE = 35 BYTES = 5 FORMAT = I5 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 6 NAME = "LIBRATION PHASE RATE EXCURSION" DESCRIPTION = "Excursion of the proper rate of libration phase, f, resulting from the running box test. Values given in 1E-4 degrees per year." UNIT = "1E-4 DEGREE PER YEAR" DATA_TYPE = ASCII_INTEGER START_BYTE = 41 BYTES = 5 FORMAT = I5 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 7 NAME = "PROPER ECCENTRICITY EXCURSION" DESCRIPTION = "Excursion of the proper eccentricity, e', resulting from the running box test. Values given in 1E-5." DATA_TYPE = ASCII_INTEGER START_BYTE = 47 BYTES = 4 FORMAT = I4 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 8 NAME = "PERIHELION RATE EXCURSION" DESCRIPTION = "Excursion of the proper rate of perihelion, g, resulting from the running box test. Values given in 1E-3 arcseconds per year." UNIT = "1E-3 ARCSECOND PER YEAR" DATA_TYPE = ASCII_INTEGER START_BYTE = 52 BYTES = 5 FORMAT = I5 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 9 NAME = "PROPER INCLINATION SINE EXCURSION" DESCRIPTION = "Excursion of the sine of proper inclination, sin(I'), resulting from the running box test. Values given in 1E-5." DATA_TYPE = ASCII_INTEGER START_BYTE = 58 BYTES = 6 FORMAT = I6 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 10 NAME = "NODE RATE EXCURSION" DESCRIPTION = "Excursion of the proper rate of node, s, resulting from the running box test. Values are given in 1E-3 arcseconds per year." UNIT = "1E-3 ARCSECOND PER YEAR" DATA_TYPE = ASCII_INTEGER START_BYTE = 65 BYTES = 5 FORMAT = I5 END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 11 NAME = "LYAPOUNOV CHARACTERISTIC EXPONENT" DESCRIPTION = "Lyapounov characteristic exponent in 1/(1E5 year)." DATA_TYPE = ASCII_REAL START_BYTE = 71 BYTES = 5 FORMAT = "F5.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 12 NAME = "INTEGRATION TIME SPAN" DESCRIPTION = "Time span of the numerical integration, in millions of years." UNIT = "MY" DATA_TYPE = ASCII_INTEGER START_BYTE = 77 BYTES = 2 FORMAT = I2 END_OBJECT = COLUMN END_OBJECT = TABLE END