NOTE = "All 'PER SPECTRAL SCAN' geometry and time columns are defined at the midpoint (middle wavelength) of the observed spectral scan." OBJECT = COLUMN NAME = OBSERVATION_TYPE COLUMN_NUMBER = 1 BYTES = 30 DATA_TYPE = CHARACTER START_BYTE = 1 DESCRIPTION = "Name of the observation type. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = CDR_NAME COLUMN_NUMBER = 2 BYTES = 27 DATA_TYPE = CHARACTER START_BYTE = 31 DESCRIPTION = "Name of the CDR from which the data were extracted. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = OBS_SEQUENCE_INDEX COLUMN_NUMBER = 3 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER START_BYTE = 58 DESCRIPTION = "Counting index for a given observational sequence. Sequences are arranged consecutively in time, so this index allows the points within a given sequence to be identified. Resets to 1 with each new sequence. PER SPECTRAL SCAN." END_OBJECT = COLUMN /* SPICE DERIVED GEOMETRY VALUES */ OBJECT = COLUMN NAME = PLANET_SUN_VECTOR_TG COLUMN_NUMBER = 4 BYTES = 24 DATA_TYPE = IEEE_REAL START_BYTE = 60 ITEMS = 3 ITEM_BYTES = 8 MISSING_CONSTANT = -1.E32 DESCRIPTION = "Derived (x,y,z) vector giving center-to-center planet-sun position in target body-fixed coordinate system at midpoint of scan. Unit = kilometers. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = PLANET_SC_VECTOR_TG COLUMN_NUMBER = 5 BYTES = 24 DATA_TYPE = IEEE_REAL START_BYTE = 84 ITEMS = 3 ITEM_BYTES = 8 MISSING_CONSTANT = -1.E32 DESCRIPTION = "Derived (x,y,z) vector giving center-to-center planet-spacecraft position in target body-fixed coordinate system at midpoint of scan. Unit = kilometers. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BORESIGHT_UNIT_VECTOR_CENTER_TG COLUMN_NUMBER = 6 BYTES = 24 DATA_TYPE = IEEE_REAL START_BYTE = 108 ITEMS = 3 ITEM_BYTES = 8 MISSING_CONSTANT = -1.E32 DESCRIPTION = "Derived (x,y,z) vector giving look direction of MASCS UVVS center in target body-fixed coordinate system at midpoint of spectral scan. Unit = N/A. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = TARGET_LATITUDE COLUMN_NUMBER = 7 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 132 MISSING_CONSTANT = -1.E32 DESCRIPTION = "Latitude below the tangent point of the UVVS field-of-view center. Measured at midpoint of spectral scan. Unit = degrees. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = TARGET_LONGITUDE COLUMN_NUMBER = 8 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 140 MISSING_CONSTANT = -1.E32 DESCRIPTION = "Longitude below the tangent point of the UVVS field-of-view center. Measured at midpoint of spectral scan. Unit = degrees. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = TARGET_ALTITUDE COLUMN_NUMBER = 9 BYTES = 24 DATA_TYPE = IEEE_REAL START_BYTE = 148 ITEMS = 3 ITEM_BYTES = 8 MISSING_CONSTANT = -1.E32 DESCRIPTION = "Altitude (center, min, max) of the actual field-of- view slit projection. Measured at midpoint of spectral scan. Unit = kilometers. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = TARGET_LOCAL_TIME COLUMN_NUMBER = 10 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 172 DESCRIPTION = "Local time of the tangent point of the UVVS field-of-view center. Local time is defined as 0 at midnight, 6 at dawn, and 12 at noon. Measured at midpoint of spectral scan. Unit= hour plus fraction of hour. (e.g. 1.5 = 90 minutes). PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SUBSPACECRAFT_LATITUDE COLUMN_NUMBER = 11 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 176 MISSING_CONSTANT = -1.E32 DESCRIPTION = "Derived subspacecraft latitude on planet surface. Measured at the midpoint of spectral scan. Unit = degrees. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SUBSPACECRAFT_LONGITUDE COLUMN_NUMBER = 12 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 184 MISSING_CONSTANT = -1.E32 DESCRIPTION = "Derived subspacecraft longitude on planet surface. Measured at the midpoint of spectral scan. Unit = degrees. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPACECRAFT_ALTITUDE COLUMN_NUMBER = 13 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 192 MISSING_CONSTANT = -1.E32 DESCRIPTION = "Derived spacecraft altitude above nadir point. Unit = kilometers. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPACECRAFT_LOCAL_TIME COLUMN_NUMBER = 14 BYTES = 4 DATA_TYPE = IEEE_REAL START_BYTE = 200 DESCRIPTION = "Local time of the subspacecraft point. Local time is defined as 0 at midnight, 6 at dawn, and 12 at noon. Measured at midpoint of spectral scan. Unit= hour plus fraction of hour. (e.g. 1.5 = 90 minutes). PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SUBSOLAR_LATITUDE COLUMN_NUMBER = 15 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 204 MISSING_CONSTANT = -1.E32 DESCRIPTION = "Derived subsolar latitude on planet surface. Measured at midpoint of spectral scan. Unit = degrees. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SUBSOLAR_LONGITUDE COLUMN_NUMBER = 16 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 212 MISSING_CONSTANT = -1.E32 DESCRIPTION = "Derived subsolar longitude on planet surface. Measured at midpoint of spectral scan. Unit = degrees. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = PLANET_TRUE_ANOMALY COLUMN_NUMBER = 17 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 220 MISSING_CONSTANT = -1.E32 DESCRIPTION = "Derived true anomaly of planet. Measured at midpoint of spectral scan. Unit = degrees. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ORBIT_NUMBER COLUMN_NUMBER = 18 BYTES = 4 DATA_TYPE = MSB_UNSIGNED_INTEGER START_BYTE = 228 DESCRIPTION = "Mercury orbit number. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = MET_PARTITION COLUMN_NUMBER = 19 BYTES = 4 DATA_TYPE = MSB_UNSIGNED_INTEGER START_BYTE = 232 DESCRIPTION = "Spacecraft clock partition number used in conjunction with MET value to perform time conversion using SPICE kernels. Introduced due to the MET rollover on 2013-01-08 which reset the MET value to 1000." END_OBJECT = COLUMN /* CALIBRATED ITEMS AND ADDITIONAL METADATA */ OBJECT = COLUMN NAME = MID_SPECTRUM_TIME COLUMN_NUMBER = 20 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 236 DESCRIPTION = "A calculated value indicating the mission elapsed time since launch at the middle of an individual UVVS spectral scan. Unit = seconds. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = UTC_TIME COLUMN_NUMBER = 21 BYTES = 17 DATA_TYPE = CHARACTER START_BYTE = 244 DESCRIPTION = "UTC time in YYDOYTHH:MM:SS.00 format derived from the MID_SPECTRUM_TIME using SPICE kernels. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = WAVELENGTH COLUMN_NUMBER = 22 BYTES = 200 DATA_TYPE = IEEE_REAL START_BYTE = 261 ITEMS = 25 ITEM_BYTES = 8 DESCRIPTION = "Wavelength vector of the spectral scan, which can be up to 25 elements. Shorter scans are padded with zeros. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RADIANCE_KR COLUMN_NUMBER = 23 BYTES = 200 DATA_TYPE = IEEE_REAL START_BYTE = 461 ITEMS = 25 ITEM_BYTES = 8 DESCRIPTION = "Vector of calibrated radiances matched with scan WAVELENGTH; up to 25 elements. Shorter scans are padded with zeros. Unit = kiloRayleighs/nanometer. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RADIANCE_SNR COLUMN_NUMBER = 24 BYTES = 200 DATA_TYPE = IEEE_REAL START_BYTE = 661 ITEMS = 25 ITEM_BYTES = 8 DESCRIPTION = "Vector of calibrated radiance SNR matched with scan WAVELENGTH; up to 25 elements. Shorter scans are padded with zeros. Derived signal-to-noise in fully calibrated radiance, propagated from fully corrected count rate uncertainty and sensitivity uncertainty. Unitless fraction, applied to radiance. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = TOTAL_RADIANCE_KR COLUMN_NUMBER = 25 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 861 DESCRIPTION = "Total radiance integrated over the specified emission line(s) in the given calibrated spectrum. Unit = kiloRayleighs. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = TOTAL_RADIANCE_SNR COLUMN_NUMBER = 26 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 869 DESCRIPTION = "Derived SNR in the total radiance, propagated from radiance SNR. Unitless fraction, applied to total radiance. PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SLIT_POS COLUMN_NUMBER = 27 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER START_BYTE = 877 DESCRIPTION = "Indicates whether slit mask is in atmospheric or surface position. Atmospheric slit results in a 1 deg. by 0.04 deg. instantaneous field of view (iFOV). Surface slit results in a 0.05 deg. by 0.04 deg. iFOV. Surface=0, Atmosphere=1. Unitless, PER SPECTRAL SCAN." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE_1 COLUMN_NUMBER = 28 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 879 DESCRIPTION = "SPARE column." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE_2 COLUMN_NUMBER = 29 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 887 DESCRIPTION = "SPARE column." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE_3 COLUMN_NUMBER = 30 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 895 DESCRIPTION = "SPARE column." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE_4 COLUMN_NUMBER = 31 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 903 DESCRIPTION = "SPARE column." END_OBJECT = COLUMN