urn:nasa:pds:mess_mascs:data_cdr:virsnc_ob3_13304_012908 1.0 1.11.0.0 Product_Observational 2019-10-07 1.0 This label was modified to convert to PDS4. 2013-10-31T01:29:09Z 2013-10-31T01:35:10Z Science Calibrated Near Infrared Atmosphere Atmospheres Structure MESSENGER Mission urn:nasa:pds:context:investigation:mission.messenger data_to_investigation MESS MASCS Instrument urn:nasa:pds:context:instrument:instrument.mascs__mess is_instrument MESSENGER Spacecraft urn:nasa:pds:context:instrument_host:spacecraft.mess is_instrument_host MERCURY Planet urn:nasa:pds:context:target:planet.mercury data_to_target Mercury Orbit Year 3 2/025506948.745 2/025507310.004 VIRSCNIR PIPE-MASCS2CDR 3.0 CK msgr20131030.bc CK msgr20131031.bc CK msgr20131101.bc FK msgr_dyn_v600.tf FK msgr_v231.tf IK msgr_mascs_v100.ti LSK naif0011.tls PCK pck00010_MSGR_v21.tpc SCLK messenger_2548.tsc SPK msgr_20040803_20150430_od431sc_2.bsp All MESSENGER geometry data are contained in a separate data set. This data set was cumulatively delivered in conjunction with each archive delivery as described in the MESSENGER Data Management and Archiving Plan (DMAP). This data set contains geometry data in the form of SPICE kernels. The data set is archived by the PDS NAIF Node in the MESSSP_1000 volume, PDS data set ID MESS-E/V/H/SPICE-6-V1.0. It is available from the NAIF online archives at http://naif.jpl.nasa.gov. urn:nasa:pds:mess_mascs:document:virs_cdr_ds.cat data_to_document data set catalog file urn:nasa:pds:mess_mascs:document:virsnc.fmt data_to_document format file containing column information virsnc_ob3_13304_012908.dat virsnc_ob3_13304_012908_file 1436660 290 virsnc_ob3_13304_012908_table_binary 0 290 This table contains MESSENGER VIRS spectra collected in the near infrared wavelength as well as instrument engineering data. Detailed descriptions for the parameters defined below are contained in the CDR SIS document. The complete column definitions are contained in an external file found in the LABEL directory of the archive volume. 51 7 4954 SEQ_COUNTER 1 1 UnsignedMSB2 2 CCSDS packet sequence counter. PACKET column. SC_TIME 2 3 UnsignedMSB4 4 Spacecraft time in integer seconds that is transmitted to MESSENGER subsystems by the Integrated Electronics Module. This is assigned to the first spectral observation contained in a science packet. All spectra contained in the science packet will be associated with this start time. Unit is in Mission Elapsed Time which is the number of seconds since launch. PACKET column. PACKET_SUBSECONDS 3 7 UnsignedMSB2 2 Subsecond time in milliseconds that the telemetry packet was initiated. All spectra contained in the science packet will be associated with this subsecond start time. Unit is 5 milliseconds (i.e. all values will be to the nearest 5 milliseconds). PACKET column. INT_TIME 4 9 UnsignedMSB2 2 Amount of time the array detectors will integrate photon counts. Unit is 0.05 second. OBSERVATION column. INT_COUNT 5 11 UnsignedMSB2 2 Total amount of integrations that will be taken. OBSERVATION column. PERIOD 6 13 UnsignedMSB2 2 Interval time after which another integration will be started. Integrations are started at the top of every period. Unit is 0.05 second. There is a 5-unit overhead between consecutive integrations, so PERIOD (in units) = INT_TIME (in units) + 5. OBSERVATION column. DARK_FREQ 7 15 UnsignedMSB2 2 Dark counts will be collected every X integrations during a VIRS observation. OBSERVATION column. TEMP_1 8 17 IEEE754MSBSingle 4 One of a redundant pair of array temperature sensors. A more complete description of this field can be found in the MASCS User\\s Guide (Applicable Document 6 in VIRS_CDR_DDR_DAP_SIS.PDF). Conversion from raw counts (DN) to degrees Celsius is: TEMP_1 = -3.34338E-18 * DN^5 + 8.979E-15 * DN^4 + 3.8131E-11 * DN^3 - 2.703E-8 * DN^2 - 0.0061 * DN - 1.67826 PER SPECTRUM column. TEMP_2 9 21 IEEE754MSBSingle 4 One of a redundant pair of array temperature sensors. A more complete description of this field can be found in the MASCS User\\s Guide (Applicable Document 6 in VIRS_CDR_DDR_DAP_SIS.PDF). Conversion from raw counts (DN) to degrees Celsius is: For the VIS detector it is the same as for TEMP_1 For the NIR detector it is: TEMP_2 = -8.89100589E-18 * DN^5 - 9.72043502E-15 * DN^4 + 1.73862825E-10 * DN^3 + 3.39958815E-7 * DN^2 - 0.00702301101 * DN - 22.2879012 PER SPECTRUM column. NIR_GAIN 10 25 UnsignedMSB2 2 Gain of NIR array detector. A more complete description of this field can be found in the MASCS User\\s Guide (Applicable Document 6 in VIRS_CDR_DDR_DAP_SIS.PDF). 0 is Low, 1 is High, 999 is N/A value when VIS detector is enabled. OBSERVATION column. OTHER_CHANNEL_ON 11 27 UnsignedMSB2 2 The other array is powered on or off (VIS in a NIR packet, NIR in a VIS packet. A value of 0 is off, a value of 1 is on. OBSERVATION column. NIR_LAMP_ON 12 29 UnsignedMSB2 2 NIR flat field lamp is powered on or off. A value of 0 is off, a value of 1 is on. OBSERVATION column. VIS_LAMP_ON 13 31 UnsignedMSB2 2 VIS flat field lamp is powered on or off. A value of 0 is off, a value of 1 is on. OBSERVATION column. BINNING 14 33 UnsignedMSB2 2 Number of pixels that were binned together in the data. A flight-software update during the mission changed how the pixels are were binned. For data with SPECTRUM_UTC_TIME prior to March 16, 2009, the pixels were co-added. For data with SPECTRUM_UTC_TIME on or after March 16, 2009, the multiple pixels were averaged. OBSERVATION column. START_PIXEL 15 35 UnsignedMSB2 2 Start pixel of data captured by the detector array. For VIS the value can be from 0-511. For NIR the value can be from 0-255. OBSERVATION column. END_PIXEL 16 37 UnsignedMSB2 2 End pixel of data captured by the detector array. For VIS the value can be from 0-511. For NIR the value can be from 0-255. The END_PIXEL must be greater than START_PIXEL. OBSERVATION column. SPECTRUM_NUMBER 17 39 UnsignedMSB2 2 Ordered number sequence for spectra in a given observation. First spectrum is 0, second is 1, third is 2, and so on. Note that for observations which span multiple science packets, the numbering sequence is continuous. PER SPECTRUM column. SPECTRUM_MET 18 41 UnsignedMSB4 4 A calculated value intended to reflect mission elapsed time (in seconds) since launch (for partition 1) or since reset (for partition 2) at the start of an individual VIRS spectrum. This is derived using the following formula: SPECTRUM_MET = SC_TIME + floor(SPECTRUM_NUMBER*PERIOD*0.050) PER SPECTRUM column. SPECTRUM_SUBSECONDS 19 45 UnsignedMSB2 2 The calculated subsecond time in milliseconds that a VIRS integration was started. For each VIRS integration, SPECTRUM_MET plus SPECTRUM_SUBSECONDS gives the spacecraft time of the start of that integration. This is derived using the following formula: SPECTRUM_SUBSECONDS = (PACKET_SUBSECONDS + SPECTRUM_NUMBER * PERIOD * 50) mod 1000 PER SPECTRUM column. 256 1 0 47 512 RAW_SPECTRUM_DATA 1 47 UnsignedMSB2 2 Column of uncompressed raw data at full 16-bit resolution. One row per spectrum, NIR spectrum has up to 256 values (depending on binning and windowing), VIS has up to 512. Unit = counts. PER SPECTRUM column. SPECTRUM_UTC_TIME 20 559 ASCII_String 17 UTC time in YYDOYTHH:MM:SS.00 format translated from spacecraft time and packet subseconds (in integer seconds) that is transmitted to MESSENGER subsystems by the Integrated Electronics Module. PER SPECTRUM column. 256 1 0 576 1024 CORRECTED_COUNTS_SPECTRUM_DATA 1 576 IEEE754MSBSingle 4 Derived column of corrected counts spectra. Counts corrected for darks, and other instrument level corrections (e.g. temperature, scattered light, etc. as determined by most current calibration.) One row per spectrum. NIR spectrum has up to 256 values (depending on binning and windowing), VIS has up to 512. Unit = corrected counts/second. PER SPECTRUM column. 256 1 0 1600 1024 CALIBRATED_RADIANCE_SPECTRUM_DATA 1 1600 IEEE754MSBSingle 4 Derived column of radiance-at-sensor spectra. One row per spectrum. NIR spectrum has up to 256 values (depending on binning and windowing), VIS has up to 512. Unit = W/(m^2 steradian micron). Radiance from saturated pixels, or binned pixels with one saturated element, are set to 1e32. PER SPECTRUM column. 256 1 0 2624 1024 NOISE_SPECTRUM_DATA 1 2624 IEEE754MSBSingle 4 Derived column of noise/error propagated through calibration procedure. One row per spectrum. NIR spectrum has up to 256 values (depending on binning and windowing), VIS has up to 512. Unit = W/(m^2 steradian micron). Noise from saturated pixels, or binned pixels with one saturated element, are set to 1e32. PER SPECTRUM column. CALIBRATION_SOFTWARE_VERSION 21 3648 IEEE754MSBSingle 4 Indicates version of calibration software used. Increments with reprocessing of CDRs. OBSERVATION column. 256 1 0 3652 1024 CHANNEL_WAVELENGTHS 1 3652 IEEE754MSBSingle 4 Column of wavelengths paired to spectrum data channels. Unit = nanometers. OBSERVATION column. HK_DATA_FLAG 22 4676 SignedMSB4 4 Null, or indicates HK data rate in inverse seconds. OBSERVATION column. DATA_QUALITY_INDEX 23 4680 ASCII_String 19 19 character index of data quality. Each digit signifies quality factor of measurements. PER SPECTRUM column. Format: ABCD-EFGH-IJKL-MNOP A: Dark Scan Flag, denotes shutter commanded closed for dark observation. 0 = shutter not engaged 1 = shutter engaged B: Temperature 1 Flag 0 = Temperature does not exceed 15 deg C threshold. 1 = Temperature exceeds 15 deg C threshold but less than 25 deg C threshold. 2 = Temperature exceeds 25 deg C threshold but less than 40 deg C threshold. 3 = Temperature exceeds 40 deg C threshold. C: Temperature 2 Flag 0 = Temperature does not exceed 15 deg C threshold. 1 = Temperature exceeds 15 deg C threshold but less than 25 deg C threshold. 2 = Temperature exceeds 25 deg C threshold but less than 40 deg C threshold. 3 = Temperature exceeds 40 deg C threshold. D: Grating Temperature Flag 0 = Temperature does not exceed 15 deg C threshold. 1 = Temperature exceeds 15 deg C threshold but less than 25 deg C threshold. 2 = Temperature exceeds 25 deg C threshold but less than 40 deg C threshold. 3 = Temperature exceeds 40 deg C threshold. E: Anomalous Pixels Integer 0-9 = Indicates number of hot pixels found. Working Definition: The number of pixels with a noise spike (defined in DQI L, below). Procedure: The number of noise spike channels for spectra i. Repeat for all N spectra. F: Partial Data Flag 0 = No partial data. 1 = Partial data exists. Working Definition: If any spectrum has nulls in the beginning or end, signifying data drop outs. Procedure: Given spectra i, evaluate first 10 channels and last 10 channels. If any channel has 0 value, set Partial Data Flag = 1. G: Saturation Flag 0 = No pixels saturated. 1 = Saturated pixels exist. H: Low Signal Level Flag 0 = Signal level not below -32768 threshold. 1 = Signal level below -32768 threshold. I: Low VIS Wavelength Uncertainty Flag (not yet implemented, set to 0) 0 = Uncertainty not above TBD threshold at low wavelengths. 1 = Uncertainty above TBD threshold at low wavelengths. J: High VIS Wavelength Uncertainty Flag (not yet implemented, set to 0) 0 = Uncertainty not above TBD threshold at high wavelengths. 1 = Uncertainty above TBD threshold at high wavelengths. K: UVVS Operating Flag 0 = UVVS is not scanning during readout. 1 = UVVS is scanning during readout. L: UVVS Noise Spike Flag 0 = No noise spike detected. 1 = Noise spike detected. Using VIRS VIS (512 channel spectrum, N spectra per CDR) as an example, Working Definition: A noise spike is a data value in 1 or 2 channels that exceeds 3 standard deviations of the average for a given channel in a given observation. Procedure: Calculate the standard deviation for channel 1 through all 1-N spectra. If spectra i has stdev >=3, then spectra i has a noise spike. Repeat calculation for channels 2-512. Keep track of the number of oise spike channels\\ per spectra. M: SPICE Version Epoch. Indicates what SPICE is used to determine pointing fields in CDR. \\Predict\\ SPICE may change one or more times before settling on \\Final\\ pointing solutions about 2 weeks from data acquisition. 0 = No SPICE 1 = Predict 2 = Actual N: Dark Saturation Flag Denotes that there are minimal unsaturated dark frames available for the polynomial fit of one or more pixels. 0 = All pixels in data record contain at least four unsaturated dark frames. 1 = One or more pixels in data record contain three or fewer unsaturated dark frames. O-P: Spares VIRS_GRATING_TEMP 24 4699 IEEE754MSBSingle 4 Derived VIRS grating temperature from HK data in degrees Celsius. PER SPECTRUM column. 5 1 0 4703 40 TARGET_LATITUDE_SET 1 4703 IEEE754MSBDouble 8 Derived latitude of footprint center, uprange edge (c1), downrange edge (c2), port, (c3) and starboard (c4) edges (5 total values, coordinates as in Figure 4 of VIRS_CDR_DDR_DAP_SIS.PDF; center point, c1, c2, c3, c4) on planet target corresponding to spectral observation. Unit = degrees. PER SPECTRUM column. 5 1 0 4743 40 TARGET_LONGITUDE_SET 1 4743 IEEE754MSBDouble 8 Derived longitude of footprint center, uprange edge (c1), downrange edge (c2), port, (c3) and starboard (c4) edges (5 total values, coordinates as in Figure 4 of VIRS_CDR_DDR_DAP_SIS.PDF; center point, c1, c2, c3, c4) on planet target corresponding to spectral observation. Unit = degrees. PER SPECTRUM column. ALONG_TRACK_FOOTPRINT_SIZE 25 4783 IEEE754MSBDouble 8 Derived length of VIRS footprint along track over the spectrum integration time, accounting for smear across surface. Unit = meters. PER SPECTRUM column. ACROSS_TRACK_FOOTPRINT_SIZE 26 4791 IEEE754MSBDouble 8 Derived instantaneous width of VIRS footprint across track at the spectrum integration midpoint, accounting for jitter across surface. Unit = meters. PER SPECTRUM column. FOOTPRINT_AZIMUTH 27 4799 IEEE754MSBDouble 8 Derived angle of footprint smear relative to a N-S line. 0 is North, plus/minus 180 is South, sign denotes east (clockwise) or west rotation of azimuth from North. Unit = degrees. PER SPECTRUM column. INCIDENCE_ANGLE 28 4807 IEEE754MSBDouble 8 Derived solar incidence angle of footprint center. Unit = degrees. PER SPECTRUM column. EMISSION_ANGLE 29 4815 IEEE754MSBDouble 8 Derived emission angle of footprint center. Unit = degrees. PER SPECTRUM column. PHASE_ANGLE 30 4823 IEEE754MSBDouble 8 SLANT_RANGE_TO_CENTER 31 4831 IEEE754MSBDouble 8 Derived slant range from s/c to footprint center (equal to s/c NADIR_ALTITUDE in nadir pointing case). Unit = kilometers. PER SPECTRUM column. SUBSPACECRAFT_LATITUDE 32 4839 IEEE754MSBDouble 8 Derived subspacecraft latitude on planet surface. Unit = degrees. PER SPECTRUM column. SUBSPACECRAFT_LONGITUDE 33 4847 IEEE754MSBDouble 8 Derived subspacecraft longitude on planet surface. Unit = degrees. PER SPECTRUM column. NADIR_ALTITUDE 34 4855 IEEE754MSBDouble 8 Derived spacecraft altitude above nadir point. Unit = kilometers. PER SPECTRUM column. SUBSOLAR_LATITUDE 35 4863 IEEE754MSBDouble 8 Derived subsolar latitude on planet surface. Unit = degrees. PER SPECTRUM column. SUBSOLAR_LONGITUDE 36 4871 IEEE754MSBDouble 8 Derived subsolar longitude on planet surface. Unit = degrees. PER SPECTRUM column. SOLAR_DISTANCE 37 4879 IEEE754MSBDouble 8 Derived subsolar distance to footprint center on planet surface. Unit = kilometers. PER SPECTRUM column. PLANET_TRUE_ANOMALY 38 4887 IEEE754MSBDouble 8 SPARE_1 39 4895 IEEE754MSBSingle 4 SPARE column. RIGHT_ASCENSION 40 4899 IEEE754MSBDouble 8 DECLINATION 41 4907 IEEE754MSBDouble 8 SPARE_2 42 4915 SignedMSB4 4 SPARE column. SPARE_3 43 4919 SignedMSB4 4 SPARE column. SPARE_4 44 4923 SignedMSB4 4 SPARE column. SPARE_5 45 4927 SignedMSB4 4 SPARE column. SPARE_6 46 4931 SignedMSB4 4 SPARE column. SPARE_7 47 4935 SignedMSB4 4 SPARE column. SPARE_8 48 4939 SignedMSB4 4 SPARE column. SPARE_9 49 4943 SignedMSB4 4 SPARE column. SPARE_10 50 4947 SignedMSB4 4 SPARE column. SPARE_11 51 4951 SignedMSB4 4 SPARE column. virsnc_ob3_13304_012908.lbl virsnc_ob3_13304_012908_pds3file 2337 virsnc_ob3_13304_012908_pds3file_stream 0 2715 7-Bit ASCII Text Carriage-Return Line-Feed