urn:nasa:pds:mess_mla_calibrated:data_rdr_radr:mlaradr1206242308 1.0 1.10.1.0 Product_Observational 2018-06-08 1.0 PDS4 migrated product. 2012-06-24T23:09:43Z 2012-06-24T23:33:45Z MESSENGER Mission urn:nasa:pds:context:investigation:mission.messenger data_to_investigation MESSENGER Spacecraft urn:nasa:pds:context:instrument_host:spacecraft.mess is_instrument_host Mercury Laser Altimeter Instrument urn:nasa:pds:context:instrument:mla.mess is_instrument Mercury Planet urn:nasa:pds:context:target:planet.mercury data_to_target Mercury Orbit Year 2 1006 1/249066848 1/249068290 mla_data cdr2scipair 2.6 MESS-E/V/H-MLA-3/4-CDR/RDR-DATA-V1.0:MLASCICDR1206242308_TAB data_to_calibrated_source_product PDS Geosciences Node mlaradr1206242308.tab 2016-03-12T21:36:00Z 0 5592 This product contains time-ordered, calibrated, geolocated active radiometric data of the Mercury Laser Altimeter (MLA). Carriage-Return Line-Feed 18 0 180 longitude 1 1 ASCII_Real 10 The planetocentric longitude of the laser spot producing dual triggers on channel 1. Longitudes increase to the East. latitude 2 11 ASCII_Real 10 The planetocentric latitude of the laser spot producing dual triggers on channel 1. reflectance 3 21 ASCII_Real 10 The calibrated reflectance (geometric albedo) derived from channel 1 low/high threshold return pairs. pulse_std 4 31 ASCII_Real 10 Pulse width standard deviation, nanoseconds. altitude 5 41 ASCII_Real 10 km The radius of the laser bounce point with respect to the center of mass of Mercury. pulse_width_hi 6 51 ASCII_Real 10 Received high threshold pulse width, nanoseconds. pulse_width_lo 7 61 ASCII_Real 10 Received low threshold pulse width, nanoseconds. threshold_hi 8 71 ASCII_Real 10 volt Discriminator high threshold on receiver channel 1. threshold_lo 9 81 ASCII_Real 10 volt Discriminator low threshold on receiver channel 1. range 10 91 ASCII_Real 10 km Range from spacecraft center of mass to bounce point, km. leading_edge 11 101 ASCII_Real 10 nanosecond The time from the low threshold discriminator trigger to the leading-edge high threshold trigger. tx_energy 12 109 ASCII_Real 8 millijoule The measured transmitted pulse energy for the current SHOT_NUMBER. emission_angle 13 117 ASCII_Real 6 Angle at a surface bounce point between a vector to MLA, and a radial vector from the center of mass. et_fire 14 123 ASCII_Real 14 second 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. met_seconds 15 137 ASCII_Real 10 second 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. frame 16 147 ASCII_Real 2 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. utc 17 149 ASCII_Date_Time_YMD 24 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. vga_gain 18 173 ASCII_Real 6 Variable gain amplifier gain factor. mlaradr1206242308.lbl 0 PDS3 Original PDS3 label Carriage-Return Line-Feed