urn:nasa:pds:mess_grs_derived:data_cdr:grs_csh2007159zzz_dat 1.0 1.10.1.0 Product_Observational 2018-07-02 1.0 PDS4 migrated product. 2007-06-08T00:01:18.777Z 2007-06-08T22:56:18.776Z 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 Gamma Ray Spectrometer Instrument urn:nasa:pds:context:instrument:grs.mess is_instrument Venus Planet urn:nasa:pds:context:target:planet.venus data_to_target Venus 2 Flyby 1/089748206 1/089830706 grs_cdr_gen 1.0 shield grs_csh2007159zzz.dat 2015-09-21T14:07:04Z 0 276 This table contains one set of Shield (SHI) spectra collected from the high purity Germanium (HPGe) detector plus spatial and temporal information and relevant engineering and counter and pulser data from the time the spectra was taken. A set is defined as all data with time stamps corresponding to a given day of year. 34 1 4301 met 1 1 UnsignedMSB4 4 Mission elapsed time, in seconds, corresponding to the start of the accumulation period for the spectra. accum_time 2 5 UnsignedMSB4 4 Accumulation time, in seconds, of the Shield detector. midpoint_met 3 9 UnsignedMSB4 4 The mission elapsed time at the midpoint of the shield Raw observation. Defined as: MET at the start of the observation + (ACCUM_TIME / 2). orbit_number 4 13 UnsignedMSB2 2 Orbit number is a unique identifier for a given orbit of the MESSENGER spacecraft around Mercury. Orbit number is defined as starting at apoherm and is calculated using the MET value and the appropriate SPICE kernels. Orbit numbering does not start until MESSENGER performs the Mercury orbit insertion. Until that time the value for orbit Number is 0. start_bin 5 15 UnsignedMSB2 2 Start Bin of the Shield detector. number_of_bins 6 17 UnsignedMSB2 2 Number of bins in the raw spectra. grs_priority_level 7 19 UnsignedMSB2 2 Indicates the type of priority assigned to the science packet. The priority level is tied to the ApID of the packet. Priority level varies from 0-3, 0 being highest and 3 being lowest priority. bad_data_flag 8 21 UnsignedMSB2 2 Intended for use as a bit-string bad data flag to indicate specific problems associated with the data. Values are expected to be assigned to specific bits as problems are identified during the course of the mission. Bit 1 - The high voltage is not on, is being ramped or has not been stable long enough. Bit 2 - Indicates a change in the analog pulse processing system gain setting. Bit 3 - Indicates a spectrum where the temperatures used for correction have fluctuated by greater than 5 percent from previous readings. Bit 4 - Indicates gamma spectra collected during a solar particle event. These spectra should not be combined with spectra collected under normal solar conditions. Bit 5 - Pulser data is not combined with the spectrum. Bit 6 - Indicates gamma spectra collected during a solar flare event. These spectra should not be combined with spectra collected under normal solar conditions. Bit 7 - Indicates gamma spectra collected during periods of decreased GS detector spectral resolution. These spectra should not be combined with spectra collected under 'normal' detector conditions. Bit 8 - Not all data channels were received on the ground. Bit 9 - Indicates a unique problem with single spectrum. Bit 10 - The high voltage has not been stable long enough. Bit 11 - This data was taken during a time when the spectra were particularly noisy. Many channels have far too many counts, especially the lower channels. 1 1024 1 0 23 4096 cal_sh 1 1 IEEE754MSBSingle 4 Spectra of light pulses produced from interaction of a gamma ray with the plastic scintillator shield. Contains the corrected counts in each of the 1024 bins after 1 accumulation period. utc_midpoint_met 9 4119 ASCII_String 23 midpoint_met converted to UTC, stored as yyyy-mm-ddThh:mm:ss.sss. mercury_centric_latitude 10 4142 IEEE754MSBDouble 8 Sub spacecraft latitude in Mercury fixed coordinates at the middle of the collection interval. mercury_centric_longitude 11 4150 IEEE754MSBDouble 8 Sub spacecraft longitude in Mercury fixed coordinates at the middle of the collection interval. Longitude increases towards the East. instr_boresight_mercury_x 12 4158 IEEE754MSBDouble 8 Sub instrument boresight (x component) in Mercury fixed coordinates at the middle of the collection interval. instr_boresight_mercury_y 13 4166 IEEE754MSBDouble 8 Sub instrument boresight (y component) in Mercury fixed coordinates at the middle of the collection interval. instr_boresight_mercury_z 14 4174 IEEE754MSBDouble 8 Sub instrument boresight (z component) in Mercury fixed coordinates at the middle of the collection interval. scalt 15 4182 IEEE754MSBDouble 8 Mercury centric altitude of the sub-spacecraft point in Mercury-fixed rotating frame at the middle of the collection interval. delta_angle 16 4190 IEEE754MSBDouble 8 Difference between instrument +y direction and true north at the middle of the collection interval. mercury_sol 17 4198 IEEE754MSBDouble 8 Longitude of the Sun at 0 hours UT on the date of the record. Taken from the Association of Lunar and Planetary Observers 'Ephemeris for Physical Observation of Mercury'. local_hour 18 4206 UnsignedByte 1 Local Sun hour at the sub-spacecraft point. local_minute 19 4207 UnsignedByte 1 Local Sun minute at the sub-spacecraft point. pointing 20 4208 UnsignedByte 1 True if pointing data was available. intersecting 21 4209 UnsignedByte 1 True if the pointing vector intersects Mercury. nadir_angle 22 4210 IEEE754MSBDouble 8 Spacecraft attitude during orbits and flybys is defined by two additional coordinate systems, the GRS LVLH (Local Vertical Local Horizontal) frame and the spacecraft fixed frame, and by the rotation of the spacecraft frame with respect to the GRS LVLH frame. In the GRS LVLH frame, the Z axis is aligned with the vector from the spacecraft to the planet center (the nadir direction), the Y axis is the negative of the cross product of the position and velocity vectors, and the X axis points in the instantaneous direction of motion, completing a right-handed coordinate system. The Z axis is along the viewing direction of the instrument deck inside the adapter ring and of the GRS just outside the adapter ring, the Y axis is directed from the spacecraft along the magnetometer boom, and the X-axis is parallel to the solar panel booms, forming a right-handed coordinate system. The spacecraft attitude is specified by the rotation of the spacecraft fixed frame Z axis in the GRS LVLH frame and a twist angle about the Z axis. The Z axis rotation is given by a nadir angle and an azimuth angle, where the nadir angle is 0 degrees when the spacecraft Z axis points along the + Z LVLH axis and 180 degrees when it points along -Z in the LVLH frame, and the LVLH azimuth angle is measured counterclockwise about the Z LVLH axis from the X LVLH axis. The twist angle is measured positive about the +Z spacecraft axis. See section 5.4.2 in the GRS_CDR_SIS for further details. azimuth 23 4218 IEEE754MSBDouble 8 Spacecraft attitude during orbits and flybys is defined by two additional coordinate systems, the GRS LVLH (Local Vertical Local Horizontal) frame and the spacecraft fixed frame, and by the rotation of the spacecraft frame with respect to the GRS LVLH frame. In the GRS LVLH frame, the Z axis is aligned with the vector from the spacecraft to the planet center (the nadir direction), the Y axis is the negative of the cross product of the position and velocity vectors, and the X axis points in the instantaneous direction of motion, completing a right-handed coordinate system. The Z axis is along the viewing direction of the instrument deck inside the adapter ring and of the GRS just outside the adapter ring, the Y axis is directed from the spacecraft along the magnetometer boom, and the X-axis is parallel to the solar panel booms, forming a right-handed coordinate system. The spacecraft attitude is specified by the rotation of the spacecraft fixed frame Z axis in the GRS LVLH frame and a twist angle about the Z axis. The Z axis rotation is given by a nadir angle and an azimuth angle, where the nadir angle is 0 degrees when the spacecraft Z axis points along the + Z LVLH axis and 180 degrees when it points along -Z in the LVLH frame, and the LVLH azimuth angle is measured counterclockwise about the Z LVLH axis from the X LVLH axis. The twist angle is measured positive about the +Z spacecraft axis. See section 5.4.2 in the GRS_CDR_SIS for further details. twist_angle 24 4226 IEEE754MSBDouble 8 Spacecraft attitude during orbits and flybys is defined by two additional coordinate systems, the GRS LVLH (Local Vertical Local Horizontal) frame and the spacecraft fixed frame, and by the rotation of the spacecraft frame with respect to the GRS LVLH frame. In the GRS LVLH frame, the Z axis is aligned with the vector from the spacecraft to the planet center (the nadir direction), the Y axis is the negative of the cross product of the position and velocity vectors, and the X axis points in the instantaneous direction of motion, completing a right-handed coordinate system. The Z axis is along the viewing direction of the instrument deck inside the adapter ring and of the GRS just outside the adapter ring, the Y axis is directed from the spacecraft along the magnetometer boom, and the X-axis is parallel to the solar panel booms, forming a right-handed coordinate system. The spacecraft attitude is specified by the rotation of the spacecraft fixed frame Z axis in the GRS LVLH frame and a twist angle about the Z axis. The Z axis rotation is given by a nadir angle and an azimuth angle, where the nadir angle is 0 degrees when the spacecraft Z axis points along the + Z LVLH axis and 180 degrees when it points along -Z in the LVLH frame, and the LVLH azimuth angle is measured counterclockwise about the Z LVLH axis from the X LVLH axis. The twist angle is measured positive about the +Z spacecraft axis. See section 5.4.2 in the GRS_CDR_SIS for further details. ad_temp 25 4234 IEEE754MSBDouble 8 Channel 06, AD Temperature, smoothed and interpolated to the center of the collection interval. hvps_temp 26 4242 IEEE754MSBDouble 8 HVPS Temperature, smoothed and interpolated to the center of the collection interval. hvps_volt 27 4250 IEEE754MSBDouble 8 HVPS Voltage, smoothed and interpolated to the center of the collection interval. hvps_ref_volt 28 4258 IEEE754MSBDouble 8 HVPS Reference Voltage, smoothed and interpolated to the center of the collection interval. preamp_temp 29 4266 IEEE754MSBDouble 8 Channel 04, Pre Amp Temperature, smoothed and interpolated to the center of the collection interval. shaper_temp 30 4274 IEEE754MSBDouble 8 Channel 05, Shaper Temperature, smoothed and interpolated to the center of the collection interval. hv_monitor 31 4282 IEEE754MSBDouble 8 Channel 07, HV Monitor, smoothed and interpolated to the center of the collection interval. hpge_raw_events 32 4290 UnsignedMSB4 4 Counter of HPGe Raw events. shield_raw_events 33 4294 UnsignedMSB4 4 Counter for SHIELD raw events. accumulated_dead_time 34 4298 UnsignedMSB4 4 Counter for accumulated dead time. grs_csh2007159zzz.lbl 0 PDS3 Original PDS3 label Carriage-Return Line-Feed