PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 2880 FILE_RECORDS = 9 ^HEADER = "SDC_0321071903_0X700_SCI.FIT" ^EXTENSION_CHARGE_DATA_HEADER = ("SDC_0321071903_0X700_SCI.FIT", 7) ^EXTENSION_CHARGE_DATA_TABLE = ("SDC_0321071903_0X700_SCI.FIT", 9) NOTE = " - Earth Mean Equator and Vernal Equinox of J2000 is the inertial reference frame used to specify observational geometry. Geometric parameters are based on best available data at time of product creation. Refer to the SPICE archive for the most current observational geometry data. - All positions are relative to body centers - Sun wrt S/C - Light time corrected for light originating from Sun and received by S/C at observation midpoint - Earth wrt S/C - Light time corrected for light originating from Earth and received by S/C at observation midpoint - Solar phase angle (relative to inverted boresight) - No overlap with STIM CALIBRATION " MISSION_NAME = "NEW HORIZONS" DATA_SET_ID = "NH-P-SDC-3-PLUTO-V3.0" PRODUCT_ID = "SDC_0321071903_0X700_SCI" PRODUCER_INSTITUTION_NAME = "SOUTHWEST RESEARCH INSTITUTE" PRODUCT_TYPE = "RDR" MISSION_PHASE_NAME = "PLUTO ENCOUNTER" NEWHORIZONS:SEQUENCE_ID = " 15012:APSD_X_SDC_ON_015__003_PowerOn" NEWHORIZONS:OBSERVATION_DESC = " Power on channels for Science Collection " TARGET_NAME = "DUST" PRODUCT_CREATION_TIME = 2017-09-21T00:00:00 START_TIME = 2015-01-19T23:49:07.696 STOP_TIME = 2015-01-20T03:57:51.696 SPACECRAFT_CLOCK_CNT_PARTITION = 3 SPACECRAFT_CLOCK_START_COUNT = "0284017265:00000" SPACECRAFT_CLOCK_STOP_COUNT = "0284032188:49992" INSTRUMENT_NAME="STUDENT DUST COUNTER" INSTRUMENT_HOST_NAME = "NEW HORIZONS" INSTRUMENT_HOST_ID = "NH" INSTRUMENT_ID = "SDC" TELEMETRY_APPLICATION_ID = "0x700" EXPOSURE_DURATION = 14924.000 DETECTOR_TYPE = "PVDF PLASTIC FILM" INST_CMPRS_TYPE = "N/A" SC_TARGET_POSITION_VECTOR = ( "N/A" , "N/A" , "N/A" ) TARGET_CENTER_DISTANCE = "N/A" TARGET_SUN_POSITION_VECTOR = ( "N/A" , "N/A" , "N/A" ) SOLAR_DISTANCE = "N/A" SC_SUN_POSITION_VECTOR = ( -1113168507.3871789 , 4253524071.7951741 , 1673892150.9072180 ) SPACECRAFT_SOLAR_DISTANCE = 4704628156.1934719 SC_EARTH_POSITION_VECTOR = ( -1185141774.5883369 , 4371335800.0507059 , 1724964986.1464369 ) SC_GEOCENTRIC_DISTANCE = 4846508217.8936329 PHASE_ANGLE = "N/A" QUATERNION = ( 0.3732142387 , 0.3555275751 , 0.7422774816 , -0.4281768509 ) QUATERNION_DESC = "QUAT_AXYZ_J2K_TO_INSTR.ASC" SPICE_FILE_NAME = { "naif0012.tls" , "new_horizons_1440.tsc" , "nh_stars_kbo_centaur_ppinp.tpc" , "pck00010.tpc" , "nh_v220.tf" , "nh_allinstruments_v002.ti" , "nh_alice_v200.ti" , "nh_lorri_v201.ti" , "nh_pepssi_v110.ti" , "nh_ralph_v100.ti" , "nh_rex_v100.ti" , "nh_sdc_v101.ti" , "nh_swap_v200.ti" , "nh_soc_misc_v001.tf" , "sb_2002jf56_2.bsp" , "jup260.bsp" , "kbo_centaur_horizons_20131129.bsp" , "nh_extras.bsp" , "nh_stars.bsp" , "NavPE_de433_od128.bsp" , "NavSE_plu047_od123.bsp" , "nh_nep_ura_000.bsp" , "nh_recon_e2j_v1.bsp" , "nh_recon_j2sep07_prelimv1.bsp" , "nh_recon_pluto_od122_v01.bsp" , "merged_nhpc_2006_v001.bc" , "merged_nhpc_2007_v001.bc" , "merged_nhpc_2008_v001.bc" , "merged_nhpc_2009_v001.bc" , "merged_nhpc_2010_v001.bc" , "merged_nhpc_2011_v001.bc" , "merged_nhpc_2012_v001.bc" , "merged_nhpc_2013_v001.bc" , "merged_nhpc_2014_v001.bc" , "merged_nhpc_2015_v039.bc" , "merged_nhpc_2016_v003.bc" , "merged_nhpc_2017_01_v010.bc" , "merged_nhpc_2017_02_v003.bc" , "nhpc_2017_061_02.bc" , "nhpc_2017_063_02.bc" , "nhpc_2017_067_03.bc" , "nhpc_2017_068_04.bc" , "nhpc_2017_072_05.bc" , "nhpc_2017_073_03.bc" , "nhpc_2017_075_03.bc" , "nhpc_2017_076_01.bc" , "nhpc_2017_077_01.bc" } OBJECT = HEADER BYTES = 17280 HEADER_TYPE = "FITS" INTERCHANGE_FORMAT = "BINARY" RECORDS = 6 DESCRIPTION = " FITS format defined in NASA/Science Office Standards Technology 100-1.0 By mutual agreement with PDS-SBN, FITS headers are the domain of the NH Project and were not part of the peer review beyond adherence to the FITS standard. FITS header values, especially geometric conventions regarding phase angle, direction of supplied vectors and sense of light time and stellar aberration corrections, were chosen to serve operational purposes and should be used with care. " END_OBJECT = HEADER OBJECT = EXTENSION_CHARGE_DATA_HEADER BYTES = 5760 HEADER_TYPE = "FITS" INTERCHANGE_FORMAT = "BINARY" RECORDS = 2 DESCRIPTION = " This is the FITS header for FITS EDU number: 1 FITS EDU name: CALIBRATED_DATA " END_OBJECT = EXTENSION_CHARGE_DATA_HEADER OBJECT = EXTENSION_CHARGE_DATA_TABLE INTERCHANGE_FORMAT = "BINARY" ROW_BYTES = 80 ROWS = 32 COLUMNS = 10 DESCRIPTION = " FITS EDU number: 1 FITS EDU name: CALIBRATED_DATA SDC recorded events calibrated to charge data as a table " OBJECT = COLUMN NAME = "UTC_TIME" BYTES = 20 COLUMN_NUMBER = 1 DATA_TYPE = "CHARACTER" START_BYTE = 1 DESCRIPTION = " The UTC time corresponding to the the MET (Mission Elapsed Time) of this row " END_OBJECT = COLUMN OBJECT = COLUMN NAME = "MET" BYTES = 8 COLUMN_NUMBER = 2 DATA_TYPE = "IEEE_REAL" START_BYTE = 21 DESCRIPTION = " Mission Elapsed Time Approximately equal to seconds past 19.January, 2006 18:08:02 UTC " END_OBJECT = COLUMN OBJECT = COLUMN NAME = "CHANNEL" BYTES = 2 COLUMN_NUMBER = 3 DATA_TYPE = "MSB_INTEGER" START_BYTE = 29 DESCRIPTION = " Channel for a particular event " END_OBJECT = COLUMN OBJECT = COLUMN NAME = "CHARGE" BYTES = 8 COLUMN_NUMBER = 4 DATA_TYPE = "IEEE_REAL" START_BYTE = 31 DESCRIPTION = " The calibrated magnitude of the event in units of charge, expressed as equivalent number of electrons. " UNIT = "CHARGE-EQUIVALENT NUMBER OF ELECTRONS" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "MASS" BYTES = 8 COLUMN_NUMBER = 5 DATA_TYPE = "IEEE_REAL" START_BYTE = 39 DESCRIPTION = " The calibrated magnitude of the event in units of grams " UNIT = "GRAM" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "MASS_THRSH" BYTES = 8 COLUMN_NUMBER = 6 DATA_TYPE = "IEEE_REAL" START_BYTE = 47 DESCRIPTION = " The threshold of the channel at the time of the event. Note that it is rare, but possible, to get hits smaller than this threshold. It is expressed in grams. " UNIT = "GRAM" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "M_SIGPLUS" BYTES = 8 COLUMN_NUMBER = 7 DATA_TYPE = "IEEE_REAL" START_BYTE = 55 DESCRIPTION = " The magnitude of the likely positive offset due to uncertainty in the measurement, expressed in grams. The Standard Deviation from the ground calibration is used as an analog for the 1-sigma combined uncertainty of the calibration charge pulse measurement and of the calibration and in-flight DN measurement. See the SOC ICD for details. " UNIT = "GRAM" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "M_SIGMINUS" BYTES = 8 COLUMN_NUMBER = 8 DATA_TYPE = "IEEE_REAL" START_BYTE = 63 DESCRIPTION = " The magnitude of the likely negative offset due to uncertainty in the measurement, expressed in grams. The Standard Deviation from the ground calibration is used as an analog for the 1-sigma combined uncertainty of the calibration charge pulse measurement and of the calibration and in-flight DN measurement. See the SOC ICD for details. " UNIT = "GRAM" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "QUALITY_FLAG" BYTES = 2 COLUMN_NUMBER = 9 DATA_TYPE = "CHARACTER" START_BYTE = 71 DESCRIPTION = " The value in this column will be the string `OK` unless there were spacecraft thruster firings less than two seconds before, or less than one second after, the recorded event. If there were such firings, the initials `TF` (meaning Thrusters Fired) will be the value this column. " END_OBJECT = COLUMN OBJECT = COLUMN NAME = "IMP_VEL" BYTES = 8 COLUMN_NUMBER = 10 DATA_TYPE = "IEEE_REAL" START_BYTE = 73 DESCRIPTION = " Assumed dust impact speed, km/s; i.e. the spacecraft-relative speed of a theoretical dust particle. This speed is used to estimate the mass of a particle (COLUMN MASS above) that would generate the impact event for the corresponding ROW of this TABLE. This speed is calculated as the magnitude of a velocity vector that is the difference between Sun-relative velocity vectors of two objects: A) the New Horizons spacecraft B) a theoretical dust particle velocity vector The Sun-relative spacecraft velocity comes from SPICE kernels used by the New Horizons Science Operations Center data processing pipeline. N.H. The kernels used by the operational pipeline may differ slightly from those in the PDS archive data set with DATA_SET_ID [NH-J/P/SS-SPICE-6-V1.0]. The theoretical dust particle is assumed to be 1) at the same position as the New Horizons spacecraft, and 2) in a theoretical, stable, circular prograde, heliocentric keplerian orbit with an instantaneous Sun-relative velocity vector that has 2.1) a direction that is parallel to the J2000 ecliptic plane [i.e. parallel to the XY plane of NAIF/SPICE frame ECLIPJ2000], and 2.2) a magnitude equal to the speed derived by this formula: SPEED = 1E-3 x SQRT(G x Msun x (1-beta) / R) where SPEED = Norm of Sun-relative velocity, km/s 1E-3 = Conversion from m/s to km/s SQRT = Square root function G = Gravitational constant = 6.67408E-11, m^3/kg/s^2 Msun = Mass of the Sun, 1.9889E30, kg beta = 0 = correction for solar pressure R = Heliocentric distance, m Units are consistent with G (m**3 kg**-1 s**-2) N.B. This method is an update to the original method of using the spacecraft Sun-relative speed by itself as an estimate for the impact speed, which was in the SDC instrument paper, [HORANYIETAL2008]. Please consult with SDC team for details. " END_OBJECT = COLUMN END_OBJECT = EXTENSION_CHARGE_DATA_TABLE END