OBJECT = COLUMN NAME = MISSION_ELAPSED_TIME COLUMN_NUMBER = 1 BYTES = 4 DATA_TYPE = MSB_UNSIGNED_INTEGER START_BYTE = 1 UNIT = SECOND DESCRIPTION = "Time tag in seconds of the start of the associated reporting/accumulation period." END_OBJECT = COLUMN OBJECT = COLUMN NAME = UTC_TIME COLUMN_NUMBER = 2 BYTES = 19 DATA_TYPE = CHARACTER START_BYTE = 5 DESCRIPTION = "UTC time at start of data collection. Format: YYYY-MM-DDTHH:MM:SS." END_OBJECT = COLUMN OBJECT = COLUMN NAME = UTC_TIME_JULDAY COLUMN_NUMBER = 3 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 24 DESCRIPTION = "UTC time at start of data collection given in Julian day." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ORBIT_NUMBER COLUMN_NUMBER = 4 BYTES = 4 DATA_TYPE = MSB_UNSIGNED_INTEGER START_BYTE = 32 DESCRIPTION = "Unique identifier for a given orbit of MESSENGER around Mercury. Orbit number is defined as starting at apoherm and is calculated using the MET value and the appropriate SPICE kernels (see GEOMETRY/geominfo.txt). Orbit numbering does not start until MESSENGER performs the Mercury orbit insertion. Until that time the value for orbit number is 0." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ACTUAL_ACCUM COLUMN_NUMBER = 5 BYTES = 4 DATA_TYPE = MSB_UNSIGNED_INTEGER START_BYTE = 36 UNIT = SECOND DESCRIPTION = "Actual accumulation period in seconds for software counters and energy histograms." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SC_ALTITUDE COLUMN_NUMBER = 6 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 40 UNIT = KM DESCRIPTION = "Spacecraft altitude above the subsatellite point on the target in units of km." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SC_LATITUDE COLUMN_NUMBER = 7 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 44 UNIT = DEGREE DESCRIPTION = "Target-centric latitude of the spacecraft subsatellite point in degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SC_LONGITUDE COLUMN_NUMBER = 8 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 48 UNIT = DEGREE DESCRIPTION = "Target-centric longitude of the spacecraft subsatellite point in degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LG1_RAW_EVENTS COLUMN_NUMBER = 9 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 52 UNIT = "COUNTS/SECOND" DESCRIPTION = "LG1 raw events in counts per second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LG2_RAW_EVENTS COLUMN_NUMBER = 10 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 56 UNIT = "COUNTS/SECOND" DESCRIPTION = "LG2 raw events in counts per second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BP_RAW_EVENTS COLUMN_NUMBER = 11 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 60 UNIT = "COUNTS/SECOND" DESCRIPTION = "BP raw events in counts per second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SW_TOTAL_EVENTS COLUMN_NUMBER = 12 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 64 UNIT = "COUNTS/SECOND" DESCRIPTION = "Total software counts in counts per second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = DEAD_TIME COLUMN_NUMBER = 13 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 68 UNIT = COUNTS DESCRIPTION = "Dead time counter in units of counts." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LG1_RESET COLUMN_NUMBER = 14 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 72 UNIT = "COUNTS/SECOND" DESCRIPTION = "LG1 resets in counts per second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LG2_RESET COLUMN_NUMBER = 15 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 76 UNIT = "COUNTS/SECOND" DESCRIPTION = "LG2 resets in counts per second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BP_RESET COLUMN_NUMBER = 16 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 80 UNIT = "COUNTS/SECOND" DESCRIPTION = "BP resets in counts per second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BPP_LGXS COLUMN_NUMBER = 17 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 84 UNIT = "COUNTS/SECOND" DESCRIPTION = "Fast neutrons moderated in the borated plastic but captured in the lithium glass. LG1 and LG2 are combined, thus the LGX designation." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LG1_OVER_RANGE COLUMN_NUMBER = 18 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 88 UNIT = "COUNTS/SECOND" DESCRIPTION = "LG1 over range counts per second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LG2_OVER_RANGE COLUMN_NUMBER = 19 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 92 UNIT = "COUNTS/SECOND" DESCRIPTION = "LG2 over range counts per second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BP_OVER_RANGE COLUMN_NUMBER = 20 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 96 UNIT = "COUNTS/SECOND" DESCRIPTION = "BP over range counts per second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LG1_BPP_COIN COLUMN_NUMBER = 21 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 100 UNIT = "COUNTS/SECOND" DESCRIPTION = "Number of LG1-prompt BP coincidence counts per second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LG2_BPP_COIN COLUMN_NUMBER = 22 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 104 UNIT = "COUNTS/SECOND" DESCRIPTION = "Number of LG2-prompt BP coincidence counts per second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LG1_BPP_LG2_COIN COLUMN_NUMBER = 23 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 108 UNIT = "COUNTS/SECOND" DESCRIPTION = "Number of LG1-LG2-prompt BP triple coincidence counts per second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = TC_EARLY COLUMN_NUMBER = 24 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 112 UNIT = "COUNTS/SECOND" DESCRIPTION = "Number of time correlated early counts per second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = TC_LATE COLUMN_NUMBER = 25 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 116 UNIT = "COUNTS/SECOND" DESCRIPTION = "Number of time correlated late counts per second." END_OBJECT = COLUMN