PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT INTERCHANGE_FORMAT = ASCII PUBLICATION_DATE = 2004-07-02 NOTE = "Explanation of PDS labels for STARDUST NAVCAM Image files." END_OBJECT = TEXT END Example label ============= N.B. A hybrid of label entries for both raw (EDR) and data-calibrated (RDR) labels is shown here. EDR OBJECTs are indictated by "/* EDR ONLY */;" RDR OBJECTs are indicated by "/* RDR ONLY */." The actual data labels contain only a subset of these examples. PDS_VERSION_ID = PDS3 /*** FILE FORMAT ***/ RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 2880 FILE_RECORDS = 4745 /*** POINTERS TO OBJECTS IN FILE ***/ ^HEADER = ( "N10040TE02_RR.FIT", 1) ^IMAGE = ( "N10040TE02_RR.FIT", 7) ^BLSIMG_HEADER = ( "N10040TE02_RR.FIT", 1464) /* EDR ONLY */ ^BLSIMG_IMAGE = ( "N10040TE02_RR.FIT", 1465) /* EDR ONLY */ ^QULMAP_HEADER = ( "N10040TE02_RR.FIT", 1464) /* RDR ONLY */ ^QULMAP_IMAGE = ( "N10040TE02_RR.FIT", 1465) /* RDR ONLY */ ^UNCMAP_HEADER = ( "N10040TE02_RR.FIT", 1830) /* RDR ONLY */ ^UNCMAP_IMAGE = ( "N10040TE02_RR.FIT", 1831) /* RDR ONLY */ ^SNRMAP_HEADER = ( "N10040TE02_RR.FIT", 3288) /* RDR ONLY */ ^SNRMAP_IMAGE = ( "N10040TE02_RR.FIT", 3289) /* RDR ONLY */ /*** GENERAL DATA DESCRIPTION PARAMETERS ***/ DATA_SET_ID = "SDU-C/CAL-NAVCAM-3-NEXT-TEMPEL1-V1.0" MISSION_NAME = "NEXT" INSTRUMENT_HOST_NAME = "STARDUST" INSTRUMENT_NAME = "NAVIGATION CAMERA" INSTRUMENT_ID = "NAVCAM" PRODUCT_ID = "N10040TE02.IMG" PRODUCT_TYPE = "RDR" MISSION_PHASE_NAME = "TEMPEL 1 ENCOUNTER" TARGET_NAME = "9P/TEMPEL 1 (1867 G1)" FRAME_SEQUENCE_NUMBER = 10040 /*** TIME PARAMETERS ***/ PRODUCT_CREATION_TIME = 2012-01-10T03:59:30 START_TIME = 2011-01-06T14:32:23.140 STOP_TIME = 2011-01-06T14:32:43.140 SPACECRAFT_CLOCK_START_COUNT = "0978791952:098" SPACECRAFT_CLOCK_STOP_COUNT = "0978791972:098" TIME_FROM_CLOSEST_APPROACH = "-39.58807 " /*** CAMERA RELATED PARAMETERS ***/ INSTRUMENT_MODE_ID = "CRUISE" EXPOSURE_DURATION = 20000.00 LIGHT_FLOOD_STATE_FLAG = "OFF" FILTER_NUMBER = "0" FILTER_NAME = "OPNAV" CENTER_FILTER_WAVELENGTH = 698.8 /*** SCAN MIRROR ANGLE AND RATE ***/ SCAN_MIRROR_ANGLE = 201.26770 SCAN_MIRROR_RATE = 0.00000 /*** TEMPERATURE PARAMETERS IN ***/ FOCAL_PLANE_TEMPERATURE = 240.79 SCAN_MIRROR_TEMPERATURE = 270.99 NOTE = " Earth Mean Equator and Vernal Equinox of J2000 is the inertial reference system 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." /*** LINE-OF-SITE ON CELESTIAL SPHERE: ANGLES IN ***/ RIGHT_ASCENSION = 201.3895 DECLINATION = 42.8108 TWIST_ANGLE = 127.6770 /*** EMEJ2000 Frame to S/C Frame Quaternion, QA,QX,QY,QZ ***/ /*** - see /DOCUMENT/QUATERNION_DESC.ASC for more detail ***/ QUATERNION = ( 0.79223, -0.45955, 0.24835, 0.31545 ) QUATERNION_DESC = "QUATERNION_DESC.ASC" /*** SMEAR MAGNITUDE AND DIRECTION ***/ SMEAR_MAGNITUDE = 4.595 SMEAR_AZIMUTH = 304.52 /*** TARGET AND SUN POSITIONS AND VELOCITIES ***/ SC_TARGET_POSITION_VECTOR = ( "N/A", "N/A", "N/A" ) SC_TARGET_VELOCITY_VECTOR = ( "N/A", "N/A", "N/A" ) TARGET_CENTER_DISTANCE = "N/A" SC_SUN_POSITION_VECTOR = ( 73516069, 171121515.8, 98503755.8 ) SC_SUN_VELOCITY_VECTOR = ( -19.497462, 14.261002, 4.317537 ) /*** PIXEL SCALES ***/ HORIZONTAL_PIXEL_SCALE = "N/A" VERTICAL_PIXEL_SCALE = "N/A" /*** VIEWING AND LIGHTING GEOMETRY (SUN ON TARGET) ***/ PHASE_ANGLE = "N/A" /*** DESCRIPTION OF OBJECTS CONTAINED IN THE FILE ***/ OBJECT = HEADER BYTES = 17280 HEADER_TYPE = "FITS" INTERCHANGE_FORMAT = "BINARY" RECORDS = 6 DESCRIPTION = "FITS header for OBJECT IMAGE FITS format defined in NASA/Science Office Standards Technology 100-1.0" END_OBJECT = HEADER OBJECT = IMAGE LINES = 1024 LINE_SAMPLES = 1024 AXIS_ORDER_TYPE = "FIRST_INDEX_FASTEST" SAMPLE_DISPLAY_DIRECTION = "RIGHT" LINE_DISPLAY_DIRECTION = "UP" SAMPLE_TYPE = IEEE_REAL SAMPLE_BITS = 32 DESCRIPTION = " The IMAGE size reflects the size of the detector, however in some cases data from only certain sections of the detector were downlinked. In these cases the pixels in the image corresponding to the areas for which data had not been downlinked are filled with zeroes. WINDOW objects define the areas containing downlinked data. N.B. If some WINDOW OBJECTs were mistakenly sequenced with a zero size, the corresponding WINDOW OBJECTs in this file have been left in this file but disabled by being commented out. The raw data were not compressed from 12- to 8-bits using a lookup table onboard the spacecraft before being stored and telemetered to the ground." OBJECT = WINDOW DESCRIPTION = "Area of the image with downlinked data." FIRST_LINE = 448 FIRST_LINE_SAMPLE = 534 LINES = 201 LINE_SAMPLES = 201 END_OBJECT = WINDOW END_OBJECT = IMAGE OBJECT = BLSIMG_HEADER /* EDR ONLY */ BYTES = 2880 HEADER_TYPE = "FITS" INTERCHANGE_FORMAT = "BINARY" RECORDS = 1 DESCRIPTION = "FITS header for OBJECT BLSIMG_IMAGE FITS format defined in NASA/Science Office Standards Technology 100-1.0" END_OBJECT = BLSIMG_HEADER OBJECT = BLSIMG_IMAGE /* EDR ONLY */ LINES = 1024 LINE_SAMPLES = 20 AXIS_ORDER_TYPE = "FIRST_INDEX_FASTEST" SAMPLE_DISPLAY_DIRECTION = "RIGHT" LINE_DISPLAY_DIRECTION = "UP" SAMPLE_TYPE = MSB_INTEGER SAMPLE_BITS = 16 OFFSET = 0 SCALING_FACTOR = 1 DESCRIPTION = " This extension contains NAVCAM BaseLine Stablilization (BLS) pixels. The last three columns of BLS pixels, when available and when windowing was not used, are used to estimate the bias (zero level) on the NAVCAM CCD-ADC system. The BLS pixels are overscan pixels run through the NAVCAM Analog-to- Digital Converter (ADC) before and after each row of actual CCD pixels was shifted off the CCD on its way to being read by the ADC. BLS pixels were originally downlinked with the CCD pixels in the telemetry, but the Science Data Center data processing pypeline separated them from the pixels in the primary IMAGE and stored them in this extension. There are eight BLS pixels from before each image row and twelve BLS pixels after each image row, for a total of twenty BLS pixels per row. Each BLS pixel is the same size as the image pixels (8 or 16 bits). If windowing was used for the main image, then all BLS pixels in this extension will be zeroes, because no BLS pixels are downlinked with windowed images." END_OBJECT = BLSIMG_IMAGE OBJECT = QULMAP_HEADER /* RDR ONLY */ BYTES = 2880 HEADER_TYPE = "FITS" INTERCHANGE_FORMAT = "BINARY" RECORDS = 1 DESCRIPTION = "FITS header for OBJECT QULMAP_IMAGE FITS format defined in NASA/Science Office Standards Technology 100-1.0" END_OBJECT = QULMAP_HEADER OBJECT = QULMAP_IMAGE /* RDR ONLY */ LINES = 1024 LINE_SAMPLES = 1024 AXIS_ORDER_TYPE = "FIRST_INDEX_FASTEST" SAMPLE_DISPLAY_DIRECTION = "RIGHT" LINE_DISPLAY_DIRECTION = "UP" SAMPLE_TYPE = MSB_INTEGER SAMPLE_BITS = 8 OFFSET = 0 SCALING_FACTOR = 1 DESCRIPTION = " This IMAGE extension is a Quality map; each quality map pixel corresponds to the image pixel in the same position in the Primary HDU image. The normal value for a quality map pixel is zero, indicating the corresponding pixel in the HDU image could be properly calibrated; a non-zero value indicates the HDU image pixel was not calibrated. Each pixel comprises several bits. A set bit (non-zero) indicates either why calibration for the corresponding pixel was not performed (e.g. pixel is missing), and/or any alternate processing performed on the pixel (e.g. despiking). The following table lists the meaning of each bit Hex Dec Description 0x01 1 Missing (outside any window(s)) 0x02 2 Known bad pixel (in a window) 0x04 4 Missing (=Zero and in window and not Bad) 0x08 8 Saturated 0x10 16 Adjacent to saturated pixel 0x20 32 Bad or Missing pixel value interpolated 0x40 64 Bad or Missing pixel value despiked " END_OBJECT = QULMAP_IMAGE OBJECT = UNCMAP_HEADER /* RDR ONLY */ BYTES = 2880 HEADER_TYPE = "FITS" INTERCHANGE_FORMAT = "BINARY" RECORDS = 1 DESCRIPTION = "FITS header for OBJECT UNCMAP_IMAGE FITS format defined in NASA/Science Office Standards Technology 100-1.0" END_OBJECT = UNCMAP_HEADER OBJECT = UNCMAP_IMAGE /* RDR ONLY */ LINES = 1024 LINE_SAMPLES = 1024 AXIS_ORDER_TYPE = "FIRST_INDEX_FASTEST" SAMPLE_DISPLAY_DIRECTION = "RIGHT" LINE_DISPLAY_DIRECTION = "UP" SAMPLE_TYPE = IEEE_REAL SAMPLE_BITS = 32 OFFSET = 0 SCALING_FACTOR = 1 DESCRIPTION = " This IMAGE extension is an uncertainty map; each uncertainty map pixel corresponds to the image pixel in the same position in the Primary HDU image. The Uncertainty map is calculated as the RSS of the uncertainties from these data calibration steps: DARKUNCR= 2.533812658302466 / [DN] Uncertainty from DARK step RATEMAXU= 0.000500007270629587 / [PERCENT] Max uncertainty from RATE step BIASUNCR= 30.0 / [DN] Uncertainty from BIAS step ABSCUNCR= 0.0 / [PERCENT] Uncertainty from ABSC step ***N.B. When the uncertainty is a Max uncertainty (keyword *MAXU), then the uncertainty from that step is an image map; when it is an Uncertainty (keyword *UNCR), then the uncertainty from that step is a single value for the entire image. ***N.B. The quality map extension (EXTNAME=QUALITY_MAP) applies to this extension as it does to the image in the PDU For more information about data calibration steps, see the Primary Data Unit header and the calibration documentation for these data." END_OBJECT = UNCMAP_IMAGE OBJECT = SNRMAP_HEADER /* RDR ONLY */ BYTES = 2880 HEADER_TYPE = "FITS" INTERCHANGE_FORMAT = "BINARY" RECORDS = 1 DESCRIPTION = "FITS header for OBJECT SNRMAP_IMAGE FITS format defined in NASA/Science Office Standards Technology 100-1.0" END_OBJECT = SNRMAP_HEADER OBJECT = SNRMAP_IMAGE /* RDR ONLY */ LINES = 1024 LINE_SAMPLES = 1024 AXIS_ORDER_TYPE = "FIRST_INDEX_FASTEST" SAMPLE_DISPLAY_DIRECTION = "RIGHT" LINE_DISPLAY_DIRECTION = "UP" SAMPLE_TYPE = IEEE_REAL SAMPLE_BITS = 32 OFFSET = 0 SCALING_FACTOR = 1 DESCRIPTION = " This IMAGE extension is a Signal to Noise Ratio (SNR) map; each SNR map pixel corresponds to the image pixel in the same position in the Primary HDU image. The SNR Map is calculated via the following steps: 1) QNOISE = Quantization noise, the greater of 1.1) (Quant^2)/12; Quant from above, and 1.2) Bin size (DN) map from decompression, squared and divided by 12 2) RNOISE = (Read noise)^2 = 10.24 3) SNOISE = Shot noise map, bias-subtracted DNs over the gain SNOISE = (RawDNs - BiasDN) / GAIN 4) TOTALNOISE = the square root of the sum of items 1, 2 and 3: TOTALNOISE = SQRT(QNOISE + RNOISE + SNOISE) 5) SNRMap = (Bias- and Dark-subtracted DNs) / TOTALNOISE ***N.B. The quality map extension (EXTNAME=QUALITY_MAP) applies to this extension as it does to the image in the PDU " END_OBJECT = SNRMAP_IMAGE END General notes regarding label ============================= * Strings appear in quotes. * Integers and PDS times do not require quotes. * Ordered lists are enclosed within (parentheses) and separated by commas. * Unordered lists are enclosed within {curly braces} and separated by commas * If a field is unknown, 'UNK' may be entered. * If a field is not applicable, 'N/A' may be entered. * Fields can spill freely, with or without white space, onto following lines. * Not all images contain the WINDOW OBJECT as a child of the IMAGE OBJECT. The WINDOW OBJECT is only present when windowed data are present in the image. Images which are full-frame do not have the WINDOW OBJECT. Definition of Label Keywords/Values =================================== N.B. Some keywords explained here are not in the example above PDS_VERSION_ID Version number of the PDS standards documents that was valid when the data product label was created. PDS3 is used in all NAVCAM image labels. RECORD_TYPE Physical file record (PFR) format; FIXED_LENGTH in all NAVCAM image labels. RECORD_BYTES Number of bytes in each FIXED_LENGTH PFRs; 2880 in all NAVCAM image labels. FILE_RECORDS Number of PFRs, including HEADER, IMAGE, HISTOGRAM and TABLE OBJECTs. ^HEADER Filename of the data file, and a one-based ^IMAGE PFR pointer to the various OBJECTS in the ^BLSIMG_HEADER data FITS file. ^BLSIMG_IMAGE ^etc. DATA_SET_ID Data set ID; "SDU-C/CAL-NAVCAM-?-NEXT-TEMPEL1-V1.0" where ? is 2 or 3 for EDR or RDR data, respectively. MISSION_NAME Mission name; "NEXT" in all NAVCAM image labels. INSTRUMENT_HOST_NAME Spacecraft name; "STARDUST" in all NAVCAM image labels. INSTRUMENT_NAME Full name of the instrument; "NAVIGATION CAMERA" in all NAVCAM image labels. INSTRUMENT_ID Abbreviated name or acronym of the instrument; "NAVCAM" in all NAVCAM image labels. PRODUCT_ID Permanent, unique identifier assigned to the image; the value has the following form: NXXXXPPFV.IMG where: N = Navigation Camera (fixed) XXXX = frame sequence numbe; may be four or five decimal digits. sequentially by time. PP = Mission Phase ( possible values ) PL: PRELAUNCH C1: CRUISE 1 EE: EARTH/MOON ENCOUNTER C2: CRUISE 2 AE: ANNEFRANK ENCOUNTER C2: CRUISE 2 WE: WILD 2 ENCOUNTER C3: CRUISE 3 ER: EARTH RETURN C4: CRUISE 4 CO: CHECKOUT (NExT) C5: CRUISE 5 C6: CRUISE 6 TE: TEMPEL 1 ENCOUNTER (incl. approach) F = filter number, possible values: 0: Navigation Filter 1: NH2 Filter 2: Oxygen ( O[1D] ) Filter 3: C2 ( & Blue ) Filter 4: Yellow Continuum Filter 5: Red Continuum Filter 6: Infrared Continuum Filter 7: High Resolution Filter N.B. Always 0 for Stardust-NExT V = Image version number (1, 2, ...) IMG = file extension (fixed). PRODUCT_TYPE Type of the data product; "EDR" or "RDR." MISSION_PHASE_NAME Mission phase name; one of the Stardust NAVCAM mission phases: "PRELAUNCH" "CRUISE 1" "EARTH/MOON ENCOUNTER" "CRUISE 2" "ANNEFRANK ENCOUNTER" "CRUISE 2" "WILD 2 ENCOUNTER" "CRUISE 3" "EARTH RETURN" "CHECKOUT" "CRUISE 5" "CRUISE 6" "TEMPEL 1 ENCOUNTER" TARGET_NAME Name of the target of the observation; "9P/TEMPEL 1 (1867 G1)" only if the direction from the spacecraft to the asteroid or comet was computed to be within the camera FOV bounds, otherwise set to 'N/A' or to 'CALIBRATION.' FRAME_SEQUENCE_NUMBER Sequential frame number (decimal) of the image acquired during flight; range=0 to 65535. May be four or five decimal digits. PRODUCT_CREATION_TIME Product creation time in YYYY-MM-DDThh:mm:ss. format. START_TIME Time of start of observation; time of the start of the integration time of the camera, presented as UTC in YYYY-MM-DDThh:mm:ss.### format. STOP_TIME Time of end of observation; time of the end of the integration time of the camera, presented as UTC in YYYY-MM-DDThh:mm:ss.### format. SPACECRAFT_CLOCK_START_COUNT Time of start of observation; time of the start of the integration time of the camera, presented as spacecraft on-board clock in "XXXXXXXXX:YYY" format, where XXXXXXXXX is on-board clock integer seconds and YYY are fractional seconds (as a count of 1/256ths of a second.) XXXXXXXXXX and YYY are decimal numbers. SPACECRAFT_CLOCK_STOP_COUNT Time of end of observation; time of the end of the integration time of the camera, presented as spacecraft on-board clock in "XXXXXXXXX:YYY" format, where XXXXXXXXX is on-board clock integer seconds and YYY are fractional seconds (as a count of 1/256ths of a second.) XXXXXXXXXX and YYY are decimal numbers. TIME_FROM_CLOSEST_APPROACH Time past closest approach to 9P/Tempel 1 in days. INSTRUMENT_MODE_ID Type of data stream from which this image was created; "CRUISE" or "ENCOUNTER", identifying the operating mode of the camera when the image was acquired. EXPOSURE_DURATION Nominal exposure duration (integration time) of the image observation, in milliseconds. Range = 0 to 20475. This is 5ms times the 12-bit setting (Range = 0 - 4095) used for the image observation. N.B. this is only a nomimal exposure duration; it does not take into account the non-linearity of the double-bladed shutter mechanism's behavior and should *not* be used as-is for image calibration. The published NAVCAM calibration paper [KLAASENETAL2012] and the NAVCAM calibration document in this data set (NC_CAL_OVERVIEW.LBL) explain the per-line offset that should be added to this number to get the exposure duration for each pixel. LIGHT_FLOOD_STATE_FLAG Flag indicating whether the calibration lamp was "ON" or "OFF". FILTER_NUMBER Number of instrument filter (or number of the position of the filter wheel) through which an image or measurement was acquired; one of the eight possible filter positions: 0: Navigation Filter 1: NH2 Filter 2: Oxygen ( O[1D] ) Filter 3: C2 ( & Blue ) Filter 4: Yellow Continuum Filter 5: Red Continuum Filter 6: Infrared Continuum Filter 7: High Resolution Filter. N.B. Always 0 for Stardust-NExT FILTER_NAME Filter name; one of the filter names: 0: "OPNAV" 1: "NH2" 2: "OXYGEN" 3: "C2" 4: "YELLOW" 5: "RED" 6: "NIR" 7: "HIRES" N.B. Always OPNAV for Stardust-NExT CENTER_FILTER_WAVELENGTH Filter center wavelength, in nanometers: 0: 698.8 nm 1: 665.1 nm 2: 633.6 nm 3: 513.2 nm 4: 580.2 nm 5: 712.9 nm 6: 874.6 nm 7: 596.4 nm N.B. Always 698.8 for Stardust-NExT SCAN_MIRROR_ANGLE Angle of the scan mirror at the instant the image was taken, in degrees. The mirror sweeps through the plane formed by the spacecraft X and Z axes. When the mirror is at 0 degrees, the light path is essentially along the +X axis. As the mirror rotates to +90 degrees, the light path is along the -Z axis. When the mirror moves on to +180 degrees, the light path is in the direction of the -X axis. The range of the mirror is approximately 0 degrees to +200 degrees. SCAN_MIRROR_RATE Last commanded velocity for the scan mirror, in degrees per second. The scan mirror is not commanded to a position, but rather is reset to an initial position and is then commanded at a specific velocity for a specific amount of time. The value given here is that commanded velocity." FOCAL_PLANE_TEMPERATURE Temperature of the Charge Coupled Device (CCD), in Kelvins. SCAN_MIRROR_TEMPERATURE Temperature of the Scan Mirror, in Kelvins. RIGHT_ASCENSION Right ascension of the CCD center view direction (line 512.5, sample 512.5) in the EME J2000 reference frame. DECLINATION Declination of the CCD center view direction (line 512.5, sample 512.5) in the EME J2000 reference frame. TWIST_ANGLE Angle of rotation about the CCD center view direction (line 512.5, sample 512.5) relative to the EME J2000 reference frame. For the NAVCAM images this is the angle between the upward direction (in left-right, bottom-up displayed image) and projection of the EME J2000 +Z axis onto the image plane, measured clockwise. Together RIGHT_ASCENSION, DECLINATION and TWIST_ANGLE elements define the pointing direction and orientation of an image or scan platform. QUATERNION Quaternion encapsulating transformation between the EME J2000 to spacecraft reference frame. QUATERNION_DESC Pointer to quaternion description file, QUATERNION_DESC.ASC, located in the /DOCUMENT/ directory of this data set. SMEAR_MAGNITUDE Number of pixels the image was smeared during the exposure time with respect to the EME J2000 reference frame, assuming zero degrees/s scan mirror rate. N.B. This value does not predict smear of 9P/Tempel 1 in the FOV, especially in closest approach images. N.B. It was found that the angular velocities in the spacecraft attitude telemetry did not accurately predict the visible smear direction or magnitude. Boris Semenov of JPL created a special SPICE C-Kernel which interpolated between discrete spacecraft attitudes and re-calculated this smear using the difference in spacecraft between the START_TIME and END_TIME of the image. The values thus calculated appear to more closely predict the visible smear. SMEAR_AZIMUTH Azimuth of the direction in which the image was smeared, in degrees. This angle is measured counter-clockwise from a horizontal reference ray pointing to the right in the image. N.B. See the notes for SMEAR_MAGNITUDE above. SC_TARGET_POSITION_VECTOR Position vector, in kilometers, from the spacecraft to the named target center expressed in the EME J2000 reference frame, corrected for light time and stellar aberration, computed at the start of image exposure. This keyword is set to "N/A" if the TARGET_NAME does not refer to 9P/Tempel 1. SC_TARGET_VELOCITY_VECTOR Velocity vector, in kilometers per second, of the named target as seen from the spacecraft expressed in the EME J2000 reference frame, corrected for light time and stellar aberration, computed at the start of image exposure. This keyword is set to "N/A" if the TARGET_NAME does not refer to 9P/Tempel 1 TARGET_CENTER_DISTANCE Distance, in kilometers, between the spacecraft and the center of mass of the named target. This keyword is set to "N/A" if the TARGET_NAME does not refer to 9P/Tempel 1. SC_SUN_POSITION_VECTOR Position vector, in kilometers, from the spacecraft to the Sun expressed in the EME J2000 reference frame, corrected for light time and stellar aberration, computed at the start of image exposure. SC_SUN_VELOCITY_VECTOR Velocity vector, in kilometers per second, of the Sun as seen from the spacecraft expressed in the EME J2000 reference frame, corrected for light time and stellar aberration, computed at the start of image exposure. HORIZONTAL_PIXEL_SCALE Horizontal picture scale, in meters per pixel, at the named target. This value is approximate; it was computed using the nominal pixel IFOV of 0.059655 milliradians and the actual distance to the target center. This keyword is set to "N/A" if the TARGET_NAME does not refer to 9P/Tempel 1. VERTICAL_PIXEL_SCALE Vertical picture scale, in meters per pixel, at the named target. This value is approximate; it was computed using the nominal pixel IFOV of 0.059655 milliradians and the actual distance to the target center. This keyword is set to "N/A" if the TARGET_NAME does not refer to 9P/Tempel 1. PHASE_ANGLE Angle between a vector to the Sun and a vector to the spacecraft, both emanating from the center of the named target. This parameter is set to "N/A" if the TARGET_NAME does not refer to 9P/Tempel 1. OBJECT = HEADER Opening line of the HEADER OBJECT which describes the FITS header for the Primary Data Unit in the FITS file. BYTES Length of the FITS header in bytes. HEADER_TYPE Always FITS. INTERCHANGE_FORMAT Always BINARY RECORDS Always equal to BYTES / 2880 DESCRIPTION Always declares this object a FITS header END_OBJECT = HEADER Closing line of the HEADER OBJECT OBJECT = IMAGE Opening line of the IMAGE object definition block. LINES Total number of data instances along the vertical axis of an image; 1024 in all NAVCAM image labels. LINE_SAMPLES Total number of data instances along the horizontal axis of an image; 1024 in all NAVCAM image labels. AXIS_ORDER_TYPE Always "FIRST_INDEX_FASTEST" SAMPLE_DISPLAY_DIRECTION Direction of increasing LINE_SAMPLES in the image, as seen from the spacecraft; always "RIGHT." LINE_DISPLAY_DIRECTION Direction of increasing LINES in the image, as seen from the spacecraft; always "UP." SAMPLE_TYPE Data storage representation of sample value after applying the OFFSET; always MSB_UNSIGNED_INTEGER or IEEE_REAL. SAMPLE_BITS Number of bits contained in a sample value; 16 for uncompressed images or 8 for compressed images. OFFSET Value to added to the stored signed integer values read from the data file to convert them to the true values. Always 0 or 32768 for compressed or uncompressed data, respectively. MAXIMUM Largest value occurring in a given instance of the image array, including the zeroes outside all WINDOWs. MINIMUM Smallest value occurring in a given instance of the image array, including the zeroes outside all WINDOWs. MEAN Mean value of the image array, including the zeroes outside all WINDOWs. STANDARD_DEVIATION Standard deviation of the image array, including the zeroes outside all WINDOWs. SATURATED_PIXEL_COUNT Number of pixels in the image whose pixel intensity value are equal to the maximum allowable digital number for the image. For compressed (8-bit) data, that maximum value is 255. For uncompressed (12-bit) data, that value is 4095. CHECKSUM Sum of all data values in a data object, including the zeroes outside all WINDOWs. OBJECT = WINDOW Opening line of a WINDOW sub-OBJECT definition block. Presence of this(these) sub-object(s) of the image object indicates that this image contains only (a) portion(s) of the original image. Each portion is presented as rectangular windows with downlinked data within nominal size image filled with zeros. Windows may overlap. DESCRIPTION Description of the windowed data; set to "Area of the image with dowlinked data." in all NAVCAM image labels. FIRST_LINE First line where window data begins in the image; one-based value. FIRST_LINE_SAMPLE Leftmost column of the window data; one-based value. This value, paired with the FIRST_LINE element create the lower-leftmost pixel of valid image data. LINES Number of lines of image data associated with this window. LINE_SAMPLES number of columns of image data associated with this window. END_OBJECT = WINDOW Closing line of the window sub-object definition block. END_OBJECT = IMAGE Closing line of the IMAGE OBJECT OBJECT = BLSIMG_HEADER Opening line of the BLSIMG_HEADER OBJECT definition block; only present in EDR data. ... Same as for HEADER above, but for FITS Extension Data Unit. END_OBJECT = BLSIMG_HEADER Closing line of the BLSIMG_HEADER OBJECT definition block. OBJECT = BLSIMG_IMAGE Opening line of the BLSIMG_IMAGE OBJECT definition block; only present in EDR data. LINES Always 1024. LINE_SAMPLES Always 20. [all others] Same as for IMAGE OBJECT above END_OBJECT = BLSIMG_IMAGE Closing line of the BLSIMG_IMAGE OBJECT definition block. OBJECT = QULMAP_HEADER Opening line of the QULMAP_HEADER OBJECT definition block; only present in RDR data. ... Same as for HEADER above, but for FITS Extension Data Unit. END_OBJECT = QULMAP_HEADER Closing line of the QULMAP_HEADER OBJECT OBJECT definition block. OBJECT = QULMAP_IMAGE Opening line of the QULMAP_IMAGE OBJECT definition block; only present in EDR data. [all others] Same as for IMAGE OBJECT above END_OBJECT = QULMAP_IMAGE Closing line of the QULMAP_IMAGE OBJECT OBJECT definition block. OBJECT = UNCMAP_HEADER Opening line of the UNCMAP_HEADER OBJECT definition block; only present in RDR data. ... Same as for HEADER above, but for FITS Extension Data Unit. END_OBJECT = UNCMAP_HEADER Closing line of the UNCMAP_HEADER OBJECT OBJECT definition block. OBJECT = UNCMAP_IMAGE Opening line of the UNCMAP_IMAGE OBJECT definition block; only present in EDR data. [all others] Same as for IMAGE OBJECT above END_OBJECT = UNCMAP_IMAGE Closing line of the UNCMAP_IMAGE OBJECT OBJECT = SNRMAP_HEADER Opening line of the SNRMAP_HEADER OBJECT definition block; only present in RDR data. ... Same as for HEADER above, but for FITS Extension Data Unit. END_OBJECT = SNRMAP_HEADER Closing line of the SNRMAP_HEADER OBJECT definition block. OBJECT = SNRMAP_IMAGE Opening line of the SNRMAP_IMAGE OBJECT definition block; only present in EDR data. [all others] Same as for IMAGE OBJECT above END_OBJECT = SNRMAP_IMAGE Closing line of the SNRMAP_IMAGE OBJECT OBJECT definition block. END Closing line of the PDS Label.