NJPL1D00PDS100000000 = SFDU_LABEL NOTE = "This structure describes the format of an orbit table entry in a Viking IRTM Cumulative Directory File. It differs from the structure of the corresponding entry in an IRTM Chunk File in that some items in the SEDR_HEADER_GROUP are defined in detail, since they have been converted to VAX floating point form. Note: An IRTM 'orbit' is denoted by the first revolution number of a set of sequences grouped together and represented by a single entry in the Orbit Table. It consists of data sequences from one or more (normally one, occasionally a few) actual Viking Orbiter revolutions, which were received in a single Experiment Data Record (EDR). For more information see the text file IRTMDATA.TXT." OBJECT = START_SEQUENCE_TABLE_ROW TYPE = VAX_INTEGER START_BYTE = 1 BYTES = 2 NOTE = "First row in SEQUENCE_TABLE with sequence data for current orbit" END_OBJECT = START_SEQUENCE_TABLE_ROW OBJECT = STOP_SEQUENCE_TABLE_ROW TYPE = VAX_INTEGER START_BYTE = 3 BYTES = 2 NOTE = "Last row in SEQUENCE_TABLE with sequence data for current orbit" END_OBJECT = STOP_SEQUENCE_TABLE_ROW OBJECT = SEQUENCES TYPE = VAX_INTEGER START_BYTE = 5 BYTES = 2 NOTE = "Number of sequences in orbit" END_OBJECT = SEQUENCES OBJECT = OBSERVATIONS TYPE = VAX_INTEGER START_BYTE = 7 BYTES = 2 NOTE = "Number of data observations in orbit" END_OBJECT = OBSERVATIONS OBJECT = ORBITER_NUMBER TYPE = VAX_INTEGER START_BYTE = 17 BYTES = 2 NOTE = "1 for Viking 1, 2 for Viking 2" END_OBJECT = ORBITER_NUMBER OBJECT = ORBIT_NUMBER TYPE = VAX_INTEGER START_BYTE = 19 BYTES = 2 NOTE = "Current orbit number" END_OBJECT = ORBIT_NUMBER OBJECT = START_YEAR TYPE = VAX_INTEGER START_BYTE = 21 BYTES = 2 NOTE = "Start year - 1900 of data in orbit" END_OBJECT = START_YEAR OBJECT = START_DAY TYPE = VAX_INTEGER START_BYTE = 23 BYTES = 2 NOTE = "Start day-of-year of data in orbit" END_OBJECT = START_DAY OBJECT = START_HOUR TYPE = VAX_INTEGER START_BYTE = 25 BYTES = 2 NOTE = "Start hour of data in orbit" END_OBJECT = START_HOUR OBJECT = START_MINUTE TYPE = VAX_INTEGER START_BYTE = 27 BYTES = 2 NOTE = "Start minute of data in orbit" END_OBJECT = START_MINUTE OBJECT = TEMPORARY_ORBIT_NUMBER TYPE = VAX_INTEGER START_BYTE = 35 BYTES = 2 NOTE = "Temporary VO-2 orbit number used for processing VO-1 Survey Mission Data (VO-1 orbit > 1000)" END_OBJECT = TEMPORARY_ORBIT_NUMBER OBJECT = IRTM_TAPE_FILE_ID TYPE = VAX_INTEGER START_BYTE = 37 BYTES = 2 NOTE = "ID of IRTM SEED file tape from which orbit data was selected for database" END_OBJECT = IRTM_TAPE_FILE_ID OBJECT = ELAPSED_PROCESSING_DAY TYPE = VAX_INTEGER START_BYTE = 39 BYTES = 2 NOTE = "Processing day of original orbit, in days since Jan 0, 1976" END_OBJECT = ELAPSED_PROCESSING_DAY OBJECT = SEDR_HEADER_GROUP START_BYTE = 41 BYTES = 200 NOTE = "Data from the Header of the IRTM Supplementary Experiment Data Record (SEDR) with Varian integer and floating point items converted to VAX format. Many of the items are NOT described below, either because they are constant, or occur elsewhere, or are not well understood." OBJECT = SEMI_MAJOR_AXIS TYPE = VAX_REAL START_BYTE = 87 BYTES = 4 UNIT = KILOMETER END_OBJECT = SEMI_MAJOR_AXIS OBJECT = ECCENTRICITY TYPE = VAX_REAL START_BYTE = 91 BYTES = 4 UNIT = DIMENSIONLESS END_OBJECT = ECCENTRICITY OBJECT = ASCENDING_NODE_LONGITUDE TYPE = VAX_REAL START_BYTE = 95 BYTES = 4 UNIT = DEGREE END_OBJECT = ASCENDING_NODE_LONGITUDE OBJECT = PERIAPSIS_ARGUMENT_ANGLE TYPE = VAX_REAL START_BYTE = 99 BYTES = 4 UNIT = DEGREE END_OBJECT = PERIAPSIS_ARGUMENT_ANGLE OBJECT = INCLINATION TYPE = VAX_REAL START_BYTE = 103 BYTES = 4 UNIT = DEGREE END_OBJECT = INCLINATION OBJECT = PERIOD TYPE = VAX_REAL START_BYTE = 107 BYTES = 4 UNIT = SECOND NOTE = "Period (anomalistic)" END_OBJECT = PERIOD OBJECT = SOLAR_DISTANCE TYPE = VAX_REAL START_BYTE = 111 BYTES = 4 UNIT = KILOMETER END_OBJECT = SOLAR_DISTANCE OBJECT = SUB_SOLAR_LONGITUDE TYPE = VAX_REAL START_BYTE = 115 BYTES = 4 UNIT = DEGREE END_OBJECT = SUB_SOLAR_LONGITUDE OBJECT = SUB_SOLAR_COLATITUDE TYPE = VAX_REAL START_BYTE = 119 BYTES = 4 UNIT = DEGREE END_OBJECT = SUB_SOLAR_COLATITUDE END_OBJECT = SEDR_HEADER_GROUP END