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 = VEL_NORM COLUMN_NUMBER = 9 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 52 UNIT = "KM/S" DESCRIPTION = "Magnitude of the spacecraft velocity as expressed in the nadir-fixed coordinate system in units of km/second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = V_DOT_X COLUMN_NUMBER = 10 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 56 UNIT = "UNITLESS" DESCRIPTION = "Velocity normalized dot product of the vector velocity and the spacecraft x-axis unit vector expressed as a unitless number from -1 to 1." END_OBJECT = COLUMN OBJECT = COLUMN NAME = V_DOT_Y COLUMN_NUMBER = 11 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 60 UNIT = "UNITLESS" DESCRIPTION = "Velocity normalized dot product of the vector velocity and the spacecraft y-axis unit vector expressed as a unitless number from -1 to 1." END_OBJECT = COLUMN OBJECT = COLUMN NAME = V_DOT_Z COLUMN_NUMBER = 12 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 64 UNIT = "UNITLESS" DESCRIPTION = "Velocity normalized dot product of the vector velocity and the spacecraft z-axis unit vector expressed as a unitless number from -1 to 1." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NADIR_ANGLE COLUMN_NUMBER = 13 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 68 UNIT = "DEGREE" DESCRIPTION = "Spacecraft orientation angle of the spacecraft z-axis and the spacecraft-to-planet center vector in units of degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = XAXIS_ANGLE COLUMN_NUMBER = 14 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 72 UNIT = "DEGREE" DESCRIPTION = "Spacecraft orientation angle of the spacecraft x-axis and the spacecraft-to-planet center vector in units of degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = YAXIS_ANGLE COLUMN_NUMBER = 15 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 76 UNIT = "DEGREE" DESCRIPTION = "Spacecraft orientation angle of the spacecraft y-axis and the spacecraft-to-planet center vector in units of degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = THETA_ANGLE COLUMN_NUMBER = 16 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 80 UNIT = "DEGREE" DESCRIPTION = "Polar angle look direction (in a theta,phi spherical geometry) of the spacecraft in the spacecraft-fixed coordinate system. THETA_ANGLE = 0 degrees is when the spacecraft z-axis points in the same direction as the spacecraft-to-planet center vector (nadir pointing)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = PHI_ANGLE COLUMN_NUMBER = 17 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 84 UNIT = "DEGREE" DESCRIPTION = "Azimuthal angle look direction (in a theta,phi spherical geometry) of the spacecraft in the spacecraft-fixed coordinate system. PHI_ANGLE = 0 degrees is when the spacecraft x-axis points along the direction of travel." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BETA_ANGLE COLUMN_NUMBER = 18 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 88 UNIT = "DEGREE" DESCRIPTION = "Angle of the normal of the spacecraft orbital plane with respect to Mercury-to-Sun vector in degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SUN_DISTANCE COLUMN_NUMBER = 19 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 92 UNIT = "KM" DESCRIPTION = "Distance of the spacecraft to the Sun in units of km." END_OBJECT = COLUMN OBJECT = COLUMN NAME = VEL_VECTOR COLUMN_NUMBER = 20 BYTES = 12 DATA_TYPE = IEEE_REAL START_BYTE = 96 ITEMS = 3 ITEM_BYTES = 4 UNIT = "KM/S" DESCRIPTION = "Three element spacecraft velocity vector expressed in the nadir-fixed coordinate system with each component in units of km/second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SC_TO_NADIR_ROT COLUMN_NUMBER = 21 BYTES = 36 DATA_TYPE = IEEE_REAL START_BYTE = 108 ITEMS = 9 ITEM_BYTES = 4 UNIT = "UNITLESS" DESCRIPTION = "Nine element rotation matrix that converts the spacecraft attitude from instrument-fixed coordinates to nadir-fixed coordinates." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LG1_SPECTRA COLUMN_NUMBER = 22 BYTES = 256 DATA_TYPE = IEEE_REAL START_BYTE = 144 ITEMS = 64 ITEM_BYTES = 4 UNIT = "COUNTS/SECOND" DESCRIPTION = "LG1 singles spectra in counts per second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LG2_SPECTRA COLUMN_NUMBER = 23 BYTES = 256 DATA_TYPE = IEEE_REAL START_BYTE = 400 ITEMS = 64 ITEM_BYTES = 4 UNIT = "COUNTS/SECOND" DESCRIPTION = "LG2 singles spectra in counts per second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BP_SPECTRA COLUMN_NUMBER = 24 BYTES = 256 DATA_TYPE = IEEE_REAL START_BYTE = 656 ITEMS = 64 ITEM_BYTES = 4 UNIT = "COUNTS/SECOND" DESCRIPTION = "Borated plastic singles spectra in counts per second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = TC_EARLY_SPECTRA COLUMN_NUMBER = 25 BYTES = 1024 DATA_TYPE = IEEE_REAL START_BYTE = 912 ITEMS = 256 ITEM_BYTES = 4 UNIT = "COUNTS/SECOND" DESCRIPTION = "Borated plastic Time Correlated (TC) first interaction spectra from the early time window in counts per second." END_OBJECT = COLUMN OBJECT = COLUMN NAME = TC_LATE_SPECTRA COLUMN_NUMBER = 26 BYTES = 1024 DATA_TYPE = IEEE_REAL START_BYTE = 1936 ITEMS = 256 ITEM_BYTES = 4 UNIT = "COUNTS/SECOND" DESCRIPTION = "Borated plastic Time Correlated (TC) first interaction spectra from the late time window in counts per second." END_OBJECT = COLUMN