KPL/IK DAWN Spacecraft Structures Instrument kernel =========================================================================== This instrument kernel (I-kernel) contains field-of-view definitions for the Dawn star trackers (ST1 and ST2), flight thrusters (FT1, FT2, FT3), and antennas (HGA, DAWN_LGA+Z, DAWN_LGA+X, DAWN_LGA-Z). Version and Date --------------------------------------------------------------------------- Version 0.0 -- August 7, 2006 -- Boris Semenov, NAIF/JPL Initial release. References --------------------------------------------------------------------------- 1. ``Kernel Pool Required Reading'' 2. ``C-kernel Required Reading'' 3. Dawn Frames Definition Kernel (FK), latest version. 4. DAWN FSDD, CDRL TD-006, 9/27/04 Implementation Notes -------------------------------------------------------- Applications that need SPICE I-kernel data must ``load'' the I-kernel file, normally during program initialization. Loading the kernel using the SPICELIB routine FURNSH causes the data items and their associated values present in the kernel to become associated with a data structure called the ``kernel pool''. The application program may then obtain the value(s) for any IK data item using the SPICELIB routines GDPOOL, GIPOOL, GCPOOL. Routine GETFOV may be used if the file contains instrument field-of-view (FOV) specification. See [1] for details. This file was created with, and can be updated with a text editor or word processor. Conventions for Specifying Data -------------------------------------------------------- Data items are specified using ``keyword=value'' assignments [1]. All keywords referencing values in this I-kernel start with the characters `INS' followed by the NAIF Dawn instrument ID code, constructed using the spacecraft ID number (-203) followed by the NAIF three digit ID number for a particular spacecraft structure. The NAIF instrument ID codes for the structures, data for which are provided in this IK, are: DAWN_HGA -203040 DAWN_LGA+Z -203030 DAWN_LGA+X -203050 DAWN_LGA-Z -203060 DAWN_ST1 -203071 DAWN_ST2 -203072 DAWN_FT1 -203081 DAWN_FT2 -203082 DAWN_FT3 -203083 The remainder of the keyword is an underscore character followed by the unique name of the data item. For example, the boresight of the HGA FOV is specified by INS-203040_BORESIGHT The upper bound on the length of all keywords is 32 characters. If a keyword is included in more than one file, or if the same keyword appears more than once within a single file, the last assignment supersedes any earlier assignments. Mounting Alignment -------------------------------------------------------- Refer to the latest version of the Dawn Frames Definition Kernel (FK) [3] for the Dawn structure reference frame definitions and mounting alignment information. FOV Parameters -------------------------------------------------------- The following structure FOV parameters are included in the data section below: ----------------------------------------------------------------- FOV parameter HGA LGAxx ST1/ST2 FT1/FT2/FT3 ----------------------------------------------------------------- Shape circle circle circle circle Size (deg) 1.5 170 25 5 ----------------------------------------------------------------- The ST1/ST2 FOV size is from [4]; HGA, LGAnn and FT1/FT2/FT3 FOV sizes are set arbitrarily. The keywords below provide FOV angular size in radians, with the cross-track size being the first value and the along-track size being the second value in each pair. Since each of the FOV is just a single pixel, IFOV is equal to the FOV in size and the pixel size parameters are set accordingly. \begindata INS-203040_FOV_ANGULAR_SIZE = ( 0.02617994, 0.02617994 ) INS-203040_IFOV = ( 0.02617994, 0.02617994 ) INS-203040_PIXEL_SAMPLES = ( 1 ) INS-203040_PIXEL_LINES = ( 1 ) INS-203040_CCD_CENTER = ( 0.5, 0.5 ) INS-203030_FOV_ANGULAR_SIZE = ( 2.96705973, 2.96705973 ) INS-203030_IFOV = ( 2.96705973, 2.96705973 ) INS-203030_PIXEL_SAMPLES = ( 1 ) INS-203030_PIXEL_LINES = ( 1 ) INS-203030_CCD_CENTER = ( 0.5, 0.5 ) INS-203050_FOV_ANGULAR_SIZE = ( 2.96705973, 2.96705973 ) INS-203050_IFOV = ( 2.96705973, 2.96705973 ) INS-203050_PIXEL_SAMPLES = ( 1 ) INS-203050_PIXEL_LINES = ( 1 ) INS-203050_CCD_CENTER = ( 0.5, 0.5 ) INS-203060_FOV_ANGULAR_SIZE = ( 2.96705973, 2.96705973 ) INS-203060_IFOV = ( 2.96705973, 2.96705973 ) INS-203060_PIXEL_SAMPLES = ( 1 ) INS-203060_PIXEL_LINES = ( 1 ) INS-203060_CCD_CENTER = ( 0.5, 0.5 ) INS-203071_FOV_ANGULAR_SIZE = ( 0.43633231, 0.43633231 ) INS-203071_IFOV = ( 0.43633231, 0.43633231 ) INS-203071_PIXEL_SAMPLES = ( 1 ) INS-203071_PIXEL_LINES = ( 1 ) INS-203071_CCD_CENTER = ( 0.5, 0.5 ) INS-203072_FOV_ANGULAR_SIZE = ( 0.43633231, 0.43633231 ) INS-203072_IFOV = ( 0.43633231, 0.43633231 ) INS-203072_PIXEL_SAMPLES = ( 1 ) INS-203072_PIXEL_LINES = ( 1 ) INS-203072_CCD_CENTER = ( 0.5, 0.5 ) INS-203081_FOV_ANGULAR_SIZE = ( 0.08726646, 0.08726646 ) INS-203081_IFOV = ( 0.08726646, 0.08726646 ) INS-203081_PIXEL_SAMPLES = ( 1 ) INS-203081_PIXEL_LINES = ( 1 ) INS-203081_CCD_CENTER = ( 0.5, 0.5 ) INS-203082_FOV_ANGULAR_SIZE = ( 0.08726646, 0.08726646 ) INS-203082_IFOV = ( 0.08726646, 0.08726646 ) INS-203082_PIXEL_SAMPLES = ( 1 ) INS-203082_PIXEL_LINES = ( 1 ) INS-203082_CCD_CENTER = ( 0.5, 0.5 ) INS-203083_FOV_ANGULAR_SIZE = ( 0.08726646, 0.08726646 ) INS-203083_IFOV = ( 0.08726646, 0.08726646 ) INS-203083_PIXEL_SAMPLES = ( 1 ) INS-203083_PIXEL_LINES = ( 1 ) INS-203083_CCD_CENTER = ( 0.5, 0.5 ) \begintext FOV Definitions --------------------------------------------------------------------------- This section contains definition for the structure FOVs. These definitions are provided in a format required by the SPICE (CSPICE) function GETFOV (getfov_c). The set of assignments in the data section below defines the star tracker, flight thruster and antenna FOVs with respect to the corresponding frames as circles of the size provided in the section above and the boresight along the +Z axis. \begindata INS-203040_FOV_FRAME = 'DAWN_HGA' INS-203040_FOV_SHAPE = 'CIRCLE' INS-203040_BORESIGHT = ( 0.0 0.0 1.0 ) INS-203040_FOV_CLASS_SPEC = 'ANGLES' INS-203040_FOV_REF_VECTOR = ( 1.0 0.0 0.0 ) INS-203040_FOV_REF_ANGLE = ( 0.75 ) INS-203040_FOV_ANGLE_UNITS = 'DEGREES' INS-203030_FOV_FRAME = 'DAWN_LGA+Z' INS-203030_FOV_SHAPE = 'CIRCLE' INS-203030_BORESIGHT = ( 0.0 0.0 1.0 ) INS-203030_FOV_CLASS_SPEC = 'ANGLES' INS-203030_FOV_REF_VECTOR = ( 1.0 0.0 0.0 ) INS-203030_FOV_REF_ANGLE = ( 85.0 ) INS-203030_FOV_ANGLE_UNITS = 'DEGREES' INS-203050_FOV_FRAME = 'DAWN_LGA+X' INS-203050_FOV_SHAPE = 'CIRCLE' INS-203050_BORESIGHT = ( 0.0 0.0 1.0 ) INS-203050_FOV_CLASS_SPEC = 'ANGLES' INS-203050_FOV_REF_VECTOR = ( 1.0 0.0 0.0 ) INS-203050_FOV_REF_ANGLE = ( 85.0 ) INS-203050_FOV_ANGLE_UNITS = 'DEGREES' INS-203060_FOV_FRAME = 'DAWN_LGA-Z' INS-203060_FOV_SHAPE = 'CIRCLE' INS-203060_BORESIGHT = ( 0.0 0.0 1.0 ) INS-203060_FOV_CLASS_SPEC = 'ANGLES' INS-203060_FOV_REF_VECTOR = ( 1.0 0.0 0.0 ) INS-203060_FOV_REF_ANGLE = ( 85.0 ) INS-203060_FOV_ANGLE_UNITS = 'DEGREES' INS-203071_FOV_FRAME = 'DAWN_ST1' INS-203071_FOV_SHAPE = 'CIRCLE' INS-203071_BORESIGHT = ( 0.0 0.0 1.0 ) INS-203071_FOV_CLASS_SPEC = 'ANGLES' INS-203071_FOV_REF_VECTOR = ( 1.0 0.0 0.0 ) INS-203071_FOV_REF_ANGLE = ( 12.5 ) INS-203071_FOV_ANGLE_UNITS = 'DEGREES' INS-203072_FOV_FRAME = 'DAWN_ST2' INS-203072_FOV_SHAPE = 'CIRCLE' INS-203072_BORESIGHT = ( 0.0 0.0 1.0 ) INS-203072_FOV_CLASS_SPEC = 'ANGLES' INS-203072_FOV_REF_VECTOR = ( 1.0 0.0 0.0 ) INS-203072_FOV_REF_ANGLE = ( 12.5 ) INS-203072_FOV_ANGLE_UNITS = 'DEGREES' INS-203081_FOV_FRAME = 'DAWN_FT1' INS-203081_FOV_SHAPE = 'CIRCLE' INS-203081_BORESIGHT = ( 0.0 0.0 1.0 ) INS-203081_FOV_CLASS_SPEC = 'ANGLES' INS-203081_FOV_REF_VECTOR = ( 1.0 0.0 0.0 ) INS-203081_FOV_REF_ANGLE = ( 2.5 ) INS-203081_FOV_ANGLE_UNITS = 'DEGREES' INS-203082_FOV_FRAME = 'DAWN_FT2' INS-203082_FOV_SHAPE = 'CIRCLE' INS-203082_BORESIGHT = ( 0.0 0.0 1.0 ) INS-203082_FOV_CLASS_SPEC = 'ANGLES' INS-203082_FOV_REF_VECTOR = ( 1.0 0.0 0.0 ) INS-203082_FOV_REF_ANGLE = ( 2.5 ) INS-203082_FOV_ANGLE_UNITS = 'DEGREES' INS-203083_FOV_FRAME = 'DAWN_FT3' INS-203083_FOV_SHAPE = 'CIRCLE' INS-203083_BORESIGHT = ( 0.0 0.0 1.0 ) INS-203083_FOV_CLASS_SPEC = 'ANGLES' INS-203083_FOV_REF_VECTOR = ( 1.0 0.0 0.0 ) INS-203083_FOV_REF_ANGLE = ( 2.5 ) INS-203083_FOV_ANGLE_UNITS = 'DEGREES' \begintext Platform ID --------------------------------------------------------------------------- These numbers are the NAIF instrument IDs of the platforms on which the instruments are mounted. For for all structures this platform is the spacecraft. \begindata INS-203040_PLATFORM_ID = ( -203000 ) INS-203030_PLATFORM_ID = ( -203000 ) INS-203050_PLATFORM_ID = ( -203000 ) INS-203060_PLATFORM_ID = ( -203000 ) INS-203071_PLATFORM_ID = ( -203000 ) INS-203072_PLATFORM_ID = ( -203000 ) INS-203081_PLATFORM_ID = ( -203000 ) INS-203082_PLATFORM_ID = ( -203000 ) INS-203083_PLATFORM_ID = ( -203000 ) \begintext