PDS_VERSION_ID = PDS3 /*** FILE FORMAT ***/ RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 79 FILE_RECORDS = 8 /*** GENERAL DATA DESCRIPTION PARAMETERS ***/ MISSION_NAME = "MESSENGER" SPACECRAFT_NAME = "MESSENGER" INSTRUMENT_HOST_NAME = "MESSENGER" DATA_SET_ID = "MESS-E/V/H-MDIS-4-CDR-CALDATA-V1.0" PRODUCT_ID = "MDISNAC_BINNED_DARKMODEL_0" /*( MDIScam_bining_DARKMODEL_v )*/ /*( cam = camera, NAC or WAC )*/ /*( bining = binning, NOTBIN or BINNED )*/ /*( v = version number, 0-9,a-z )*/ PRODUCER_INSTITUTION_NAME = "APPLIED PHYSICS LABORATORY" /*** TIME PARAMETERS ***/ PRODUCT_CREATION_TIME = 2007-09-25T20:00:00 /*** INSTRUMENT ENGINEERING PARAMETERS ***/ INSTRUMENT_NAME = "MERCURY DUAL IMAGING SYSTEM NARROW ANGLE CAMERA" INSTRUMENT_ID = "MDIS-NAC" MESS:FPU_BIN = 1 MESS:COMP12_8 = 0 OBJECT = FILE ^TABLE = "MDISNAC_BINNED_DARKMODEL_0.TAB" RECORD_TYPE = FIXED_LENGTH FILE_RECORDS = 8 RECORD_BYTES = 79 OBJECT = TABLE NAME = "MDIS NAC BINNED DARK MODEL VERSION 0" INTERCHANGE_FORMAT = "ASCII" ROWS = 8 COLUMNS = 5 ROW_BYTES = 79 DESCRIPTION = "This is the forward model of dark level (dark current plus electronics bias) for the MDIS narrow-angle camera, with pixel binning turned on (MESS:FPU_BIN = 1). It models a 12-bit DN level. Either MESS:COMP12_8 = 0, or if MESS:COMP12_8 = 1, the data are inverted to 12 bits using the inverse look-up tables given in MDISLUTINV.TAB and described in MDISLUTINV.LBL. The model estimates the dark level Dk(x,y,t,T) as a function of column position x, row position y, exposure time t (MESS:EXPOSURE or EXPOSURE_DURATION), and CCD temperature T (MESS:CCD_TEMP): Dk(x,y,t,T) = C(T) + D(T) + [E(T) + F(T) * t] * y + {O(T) + P(T) * t + [Q(T) + S(T) * t] * y} * x Variables C(T), D(T), E(T), F(T), O(T), P(T), Q(T), and S(T) are all third-order functions of CCD temperature, for example: C(T) = H0 + H1 * T + H2 * T**2 + H3 * T**3 In all cases x or y is in the range 0-1023 for a not-binned image or 0-511 for a binned image, t is in units of milliseconds, and T is in UNCALIBRATED raw counts of CCD temperature." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = H0 DATA_TYPE = ASCII_REAL START_BYTE = 1 BYTES = 17 DESCRIPTION = "0th order coefficient to polynomial fit." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = H1 DATA_TYPE = ASCII_REAL START_BYTE = 19 BYTES = 18 DESCRIPTION = "1st order coefficient to polynomial fit." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = H2 DATA_TYPE = ASCII_REAL START_BYTE = 38 BYTES = 18 DESCRIPTION = "2nd order coefficient to polynomial fit." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = H3 DATA_TYPE = ASCII_REAL START_BYTE = 57 BYTES = 18 DESCRIPTION = "3rd order coefficient to polynomial fit." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 NAME = VARIABLE DATA_TYPE = ASCII_REAL START_BYTE = 76 BYTES = 2 DESCRIPTION = "Variable expressed by polynomial fit." END_OBJECT = COLUMN END_OBJECT = TABLE END_OBJECT = FILE END