urn:nasa:pds:mess_ns_derived:data_ddr:ns_ddr_ncr2014199zzz_tab 1.0 1.10.1.0 Product_Observational 2018-10-17 1.0 PDS4 migrated product. 2014-07-18T00:02:44Z 2014-07-18T23:59:13Z 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 Neutron Spectrometer Instrument urn:nasa:pds:context:instrument:ns.mess is_instrument Mercury Planet urn:nasa:pds:context:target:planet.mercury data_to_target Mercury Orbit Year 4 1/047965613 1/048051802 ns_ddr_ncr ns_ddr_gen 1.0 ns_ddr_ncr2014199zzz.tab 2016-01-25T18:00:32Z

0 364 7-Bit ASCII Text Column headings

364 2757 This table contains one set of calibrated spectra collected from the MESSENGER Neutron Spectrometer (NS) plus timing, spatial, and engineering information taken during the spectral collection period. A set is defined as all data with timestamps corresponding to a given day of year. Carriage-Return Line-Feed 27 2 364 julian_day 1 1 ASCII_Real 13 UTC time at *midpoint* of data collection given in Julian day. utc_time 2 15 ASCII_String 19 UTC time at *midpoint* of data collection. Format: YYYY-MM-DDTHH:MM:SS met 3 35 ASCII_Integer 12 second Time tag in seconds at the start of the associated reporting/accumulation period. orbit_number 4 48 ASCII_Integer 4 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. actual_accum 5 53 ASCII_Integer 4 second Actual accumulation period in seconds for software counters and energy histograms. sensor_temp 6 58 ASCII_Real 7 degC NS sensor temperature in units of degree C. altitude 7 66 ASCII_Real 10 km Spacecraft altitude above the subsatellite point on the target in units of km. latitude 8 77 ASCII_Real 7 degree Target-centric latitude of the spacecraft subsatellite point in degrees. longitude 9 85 ASCII_Real 8 degree Target-centric longitude of the spacecraft subsatellite point in degrees. local_time 10 94 ASCII_Real 10 Local time of the spacecraft subsatellite point in hours from 0 to 24. 1 3 2 0 105 27 velocity_vector 1 1 ASCII_Real 8 km/s Three element spacecraft velocity vector expressed in the nadir-fixed coordinate system with each component in units of km/second. null 2 9 ASCII_String 1 Whitespace skip byte. vel_norm 11 132 ASCII_Real 8 km/s Magnitude of the spacecraft velocity as expressed in the nadir-fixed coordinate system in units of km/second. 2 9 2 0 141 81 sc_to_nadir_rot 1 1 ASCII_Real 8 Nine element rotation matrix that converts the spacecraft attitude from instrument-fixed coordinates to nadir-fixed coordinates. null 2 9 ASCII_String 1 Whitespace skip byte. vdot_x 12 222 ASCII_Real 8 Velocity normalized dot product of the vector velocity and the spacecraft x-axis unit vector expressed as a unitless number from -1 to 1. vdot_y 13 231 ASCII_Real 8 Velocity normalized dot product of the vector velocity and the spacecraft y-axis unit vector expressed as a unitless number from -1 to 1. vdot_z 14 240 ASCII_Real 8 Velocity normalized dot product of the vector velocity and the spacecraft z-axis unit vector expressed as a unitless number from -1 to 1. nadir_angle 15 249 ASCII_Real 8 degree Spacecraft orientation angle of the spacecraft z-axis and the spacecraft-to-planet center vector in units of degrees. yaxis_angle 16 258 ASCII_Real 8 degree Spacecraft orientation angle of the spacecraft y-axis and the spacecraft-to-planet center vector in units of degrees. xaxis_angle 17 267 ASCII_Real 8 degree Spacecraft orientation angle of the spacecraft x-axis and the spacecraft-to-planet center vector in units of degrees. theta_angle 18 276 ASCII_Real 8 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). phi_angle 19 285 ASCII_Real 8 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. beta_angle 20 294 ASCII_Real 8 degree Angle of the normal of the spacecraft orbital plane with respect to Mercury-to-Sun vector in degrees. sun_distance 21 303 ASCII_Real 12 km Distance of the spacecraft to the Sun in units of km. lg1_cps 22 316 ASCII_Real 7 counts/second Net neutron count rate from the LG1 sensor in units of counts per second. lg1_err_cps 23 324 ASCII_Real 7 counts/second Net uncertainty (error) in the the LG1 count rate in units of counts per second. lg2_cps 24 332 ASCII_Real 7 counts/second Net neutron count rate from the LG2 sensor in units of counts per second. lg2_err_cps 25 340 ASCII_Real 7 counts/second Net uncertainty (error) in the the LG2 count rate in units of counts per second. bp_cps 26 348 ASCII_Real 7 counts/second Net neutron count rate from the BP sensor in units of counts per second. bp_err_cps 27 356 ASCII_Real 7 counts/second Net uncertainty (error) in the the BP count rate in units of counts per second. ns_ddr_ncr2014199zzz.lbl 0 PDS3 Original PDS3 label Carriage-Return Line-Feed