/****************************************************************************/ /* MLARADR.FMT v6 March 8, 2016 */ /* edited for accuracy 9/14/12 k. jha */ /* 3 data columns added 10/03/12 k. jha */ /* updated 3/08/16 to planetocentric reference /gan/ */ /* add VGA column 3/12/16, 180 byte records /gan/ */ /****************************************************************************/ OBJECT = COLUMN NAME = LONGITUDE COLUMN_NUMBER = 1 BYTES = 10 DATA_TYPE = ASCII_REAL START_BYTE = 1 FORMAT = "F10.5" DESCRIPTION = "The planetocentric longitude of the laser spot producing dual triggers on channel 1." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LATITUDE COLUMN_NUMBER = 2 BYTES = 10 DATA_TYPE = ASCII_REAL START_BYTE = 11 FORMAT = "F10.5" DESCRIPTION = "The planetocentric latitude of the laser spot producing dual triggers on channel 1." END_OBJECT = COLUMN OBJECT = COLUMN NAME = REFLECTANCE COLUMN_NUMBER = 3 BYTES = 10 DATA_TYPE = ASCII_REAL START_BYTE = 21 FORMAT = "F10.4" DESCRIPTION = "The calibrated reflectance (geometric albedo) derived from channel 1 low/high threshold return pairs." END_OBJECT = COLUMN OBJECT = COLUMN NAME = PULSE_STD COLUMN_NUMBER = 4 BYTES = 10 DATA_TYPE = ASCII_REAL START_BYTE = 31 FORMAT = "F10.3" DESCRIPTION = "Pulse width standard deviation, nanoseconds." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ALTITUDE COLUMN_NUMBER = 5 BYTES = 10 DATA_TYPE = ASCII_REAL START_BYTE = 41 FORMAT = "F10.4" UNIT = "KM" DESCRIPTION = "The radius of the laser bounce point with respect to the center of mass of Mercury." END_OBJECT = COLUMN OBJECT = COLUMN NAME = PULSE_WIDTH_HI COLUMN_NUMBER = 6 BYTES = 10 DATA_TYPE = ASCII_REAL START_BYTE = 51 FORMAT = "F10.1" DESCRIPTION = "Received high threshold pulse width, nanoseconds." END_OBJECT = COLUMN OBJECT = COLUMN NAME = PULSE_WIDTH_LO COLUMN_NUMBER = 7 BYTES = 10 DATA_TYPE = ASCII_REAL START_BYTE = 61 FORMAT = "F10.1" DESCRIPTION = "Received low threshold pulse width, nanoseconds." END_OBJECT = COLUMN OBJECT = COLUMN NAME = THRESHOLD_HI COLUMN_NUMBER = 8 BYTES = 10 DATA_TYPE = ASCII_REAL START_BYTE = 71 UNIT = "VOLT" FORMAT = "F10.4" DESCRIPTION = "Discriminator high threshold on receiver channel 1." END_OBJECT = COLUMN OBJECT = COLUMN NAME = THRESHOLD_LO COLUMN_NUMBER = 9 BYTES = 10 DATA_TYPE = ASCII_REAL START_BYTE = 81 UNIT = "VOLT" FORMAT = "F10.4" DESCRIPTION = "Discriminator low threshold on receiver channel 1." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RANGE COLUMN_NUMBER = 10 BYTES = 10 DATA_TYPE = ASCII_REAL START_BYTE = 91 UNIT = "KM" FORMAT = "F10.3" DESCRIPTION = "Range from spacecraft center of mass to bounce point, km." END_OBJECT = COLUMN /* # the leading-edge time difference tle */ OBJECT = COLUMN NAME = LEADING_EDGE COLUMN_NUMBER = 11 BYTES = 8 DATA_TYPE = ASCII_REAL START_BYTE = 101 UNIT = "NANOSECONDS" FORMAT = "F8.1" DESCRIPTION = "The time from the low threshold discriminator trigger to the leading-edge high threshold trigger." END_OBJECT = COLUMN OBJECT = COLUMN NAME = TX_ENERGY COLUMN_NUMBER = 12 BYTES = 8 DATA_TYPE = ASCII_REAL START_BYTE = 109 UNIT = "MILLIJOULE" FORMAT = "F8.1" DESCRIPTION = "The measured transmitted pulse energy for the current SHOT_NUMBER." END_OBJECT = COLUMN OBJECT = COLUMN NAME = EMISSION_ANGLE COLUMN_NUMBER = 13 BYTES = 6 DATA_TYPE = ASCII_REAL START_BYTE = 117 FORMAT = "F6.2" DESCRIPTION = "Angle at a surface bounce point between a vector to MLA, and a radial vector from the center of mass." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ET_FIRE COLUMN_NUMBER = 14 BYTES = 14 DATA_TYPE = ASCII_REAL START_BYTE = 123 FORMAT = "F14.3" UNIT = "SECOND" DESCRIPTION = "The independent variable of the equations of motion in the Solar System Barycentric frame at the laser fire time, in seconds from the J2000 epoch, also known as Ephemeris Time or Coordinate Time. Its practical realization is the project-supplied clock kernel, applied to the Spacecraft Clock Mission Elapsed Time (MET_SECONDS) that is transmitted to MESSENGER subsystems by the Integrated Electronics Module at the time of the 1 PPS signal. The NAIF SPICE spacecraft clock (SCLK) kernel determines a corresponding Terrestrial Dynamic Time. These times are synchronous with respect to an observer at the Solar System barycenter. The SPICE library routine SCS2E performs the conversion to Ephemeris Time as used by the JPL Planetary Ephemeris." END_OBJECT = COLUMN OBJECT = COLUMN NAME = MET_SECONDS COLUMN_NUMBER = 15 BYTES = 10 DATA_TYPE = ASCII_REAL START_BYTE = 137 FORMAT = "I10" UNIT = "SECOND" DESCRIPTION = " Spacecraft Clock Mission Elapsed Time (MET_SECONDS), that is transmitted to MESSENGER subsystems by the Integrated Electronics Module at the time of the 1 PPS signal." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FRAME COLUMN_NUMBER = 16 BYTES = 2 DATA_TYPE = ASCII_REAL START_BYTE = 147 FORMAT = "I2" DESCRIPTION = " Minor frame (0-7) of the 8-Hz data. MET and FRAME together provide the epoch of packet formation, such that each packet has a unique identifier." END_OBJECT = COLUMN OBJECT = COLUMN NAME = UTC COLUMN_NUMBER = 17 BYTES = 24 DATA_TYPE = TIME START_BYTE = 149 DESCRIPTION = "Laser shot time origin T0, converted to Coordinated Universal Time (UTC). The project-supplied clock kernel and NAIF routines convert MET into Terrestrial Dynamical Time (TDT) seconds past the J2000 epoch, and by accounting for leap seconds and the 32.184 s offset between TDT and UTC, to a standard calendar representation of UTC. The laser fire occurs about 0.97 to 1 ms after T0." END_OBJECT = COLUMN OBJECT = COLUMN NAME = VGA_GAIN COLUMN_NUMBER = 18 BYTES = 6 DATA_TYPE = ASCII_REAL START_BYTE = 173 FORMAT = "F6.3" DESCRIPTION = "Variable gain amplifier gain factor." END_OBJECT = COLUMN