PDS_VERSION_ID = PDS3 /*** FILE FORMAT ***/ RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 58 FILE_RECORDS = 12 /*** 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 = "MDISWAC_NOTBIN_RESP_5" /*( MDIScam_bining_RESP_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 = 2012-11-26T20:00:00 START_TIME = 2004-08-19T18:06:37 STOP_TIME = 2011-05-24T03:58:00 /*** INSTRUMENT ENGINEERING PARAMETERS ***/ INSTRUMENT_NAME = "MERCURY DUAL IMAGING SYSTEM WIDE ANGLE CAMERA" INSTRUMENT_ID = "MDIS-WAC" MESS:FPU_BIN = 0 MESS:COMP12_8 = 0 OBJECT = FILE ^TABLE = "MDISWAC_NOTBIN_RESP_5.TAB" RECORD_TYPE = FIXED_LENGTH FILE_RECORDS = 12 RECORD_BYTES = 58 OBJECT = TABLE NAME = "MDIS WAC NOT-BINNED RESPONSIVITY MODEL, VERSION 5" INTERCHANGE_FORMAT = "ASCII" ROWS = 12 COLUMNS = 5 ROW_BYTES = 58 DESCRIPTION = "This is the model of responsivity for the MDIS wide-angle camera, without pixel binning turned on (MESS:FPU_BIN = 0). Beginning with data delivered in March 2013, responsivity version 5 and higher, the WAC responsivity correction is segmented with time. The segmentation is to allow correction of residuals in the empirical correction to responsivity for deposition and ablation of a contaminant on the optics of the WAC after May 2011. WAC global 8-color mapping image data were collected in 4 major groups in 2011, and the segments correspond to the group before the contamination and the three groups after. Version 5 covers the period of time from launch to the beginning of the contamination episode; it is equivalent version 4 with an updated correction for CCD temperature. Responsivity corrects raw DN to units of radiance, after correction for dark level, frame transfer smear, linearity, and flat field. The responsivity is in units of DN per unit time per unit radiance. It is dependent on filter position f (FILTER_NUMBER), CCD temperature T (MESS:CCD_TEMP), and binning state b (MESS:FPU_BIN). Exposure time t is in raw units of ms (MESS:EXPOSURE or EXPOSURE_DURATION) and radiance in units of W / (m**2 microns**1 sr**1). Responsivity is calculated as using a second-order polynomial as Resp(f,T,b) = R(f,t=-30.3C,b) * [correction_offset(f,b) + T(CCD) * correction_coef1(f,b) + T(CCD)^2 * correction_coef2(f,b)] where Resp(f,T,b) is responsivity in filter f at CCD temperature T in binning state b, T(CCD) is raw CCD temperature in units of DNs, R(f,t=-30.3C,b) is responsivity in filter f in binning state b at CCD temperature of 1060 DN (-30.3C), correction_offset(f,b) is camera- and filter-dependent temperature correction offset for filter f and binning state b, correction_coef1(f,b) is the camera- and filter-dependent temperature correction first-order coefficient for filter f and binning state b. correction_coef2(f,b) is the camera- and filter-dependent temperature correction second-order coefficient for filter f and binning state b. The temperature correction defaults to unity at CCD temperature of 1060 DN (-30.3C). To apply responsivity to obtain radiance L, the expression is L = DN_dk_sm_lin_fl / (t * Resp(f,T,b)) where DN_dk_sm_lin_fl is dark-, smear-, linearity-, and flat field-corrected DN, t is the exposure time in milliseconds, Resp(f,T,b) is the responsivity. A separate correction accounts for time variation in responsivity after the beginning of the contamination event." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = FILTER_NUMBER DATA_TYPE = ASCII_INTEGER START_BYTE = 1 BYTES = 2 DESCRIPTION = "WAC filter position as given in FILTER_NUMBER." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = REFERENCE_RESPONSIVITY DATA_TYPE = ASCII_REAL START_BYTE = 4 BYTES = 11 DESCRIPTION = "Responsivity at the reference temperature MESS:CCD_TEMP=1060 (-30.3C)." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = CORRECTION_OFFSET DATA_TYPE = ASCII_REAL START_BYTE = 16 BYTES = 12 DESCRIPTION = "Offset term in the CCD temperature correction to responsivity." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = CORRECTION_COEF1 DATA_TYPE = ASCII_REAL START_BYTE = 29 BYTES = 12 DESCRIPTION = "Coefficient to the first order term in the CCD temperature correction to responsivity." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 NAME = CORRECTION_COEF2 DATA_TYPE = ASCII_REAL START_BYTE = 42 BYTES = 15 DESCRIPTION = "Coefficient to the second order term in the CCD temperature correction to responsivity." END_OBJECT = COLUMN END_OBJECT = TABLE END_OBJECT = FILE END