KPL/IK

Star Tracker Instrument kernel
===========================================================================

   This instrument kernel (I-kernel) contains Rosetta Star Tracker 
   field-of-view parameters.


Version and Date
---------------------------------------------------------------------------

   Version 1.0 -- November 24, 2015 -- Bjorn Grieger, ESA/ESAC
                                       Boris Semenov, JPL

      Initial release.


References
---------------------------------------------------------------------------

   1. Rosetta Frames Definition Kernel (FK), latest version.
      
   2. ''Kernel Pool Required Reading''
   
   3. Draft Star Tracker IK by Bjorn Grieger, ROS_STR_V00.TI, 
      November 24, 2015



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 [2] 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 Rosetta instrument ID code.
   The Star Tracker instrument IDs are defined in [1] as follows:

               Instrument name          ID
               --------------------   -------
               ROS_STR-A              -226080
               ROS_STR-B              -226090


   The remainder of the keyword is an underscore character followed by
   the unique name of the data item. For example, the boresight of
   the Star Tracker A (STR-A) is specified by

               INS-226080_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.


Overview
--------------------------------------------------------

   TBD


Mounting Alignment
--------------------------------------------------------

   Refer to the latest version of the Rosetta Frames Definition Kernel
   (FK) [1] for the Star Tracker reference frame definitions and
   mounting alignment information.


FOV Definitions
---------------------------------------------------------------------------

   This section contains definitions for the Star Tracker FOVs. These
   definitions are provided in the format required by the SPICE
   (CSPICE) function GETFOV (getfov_c).
 
   As in [3] the Star Tracker detector FOVs are defined with respect to
   the corresponding Star Tracker frames to be squares with the half
   angular extent of 8.25 degrees and the boresights along the +Z axes
   of the corresponding frames. These FOV definitions use angular extent
   style specification.

      \begindata

         INS-226080_FOV_FRAME                 = 'ROS_STR-A'
         INS-226080_FOV_SHAPE                 = 'RECTANGLE'
         INS-226080_BORESIGHT                 = ( 0.0     0.0    46.0 )
         INS-226080_FOV_CLASS_SPEC            = 'ANGLES'
         INS-226080_FOV_REF_VECTOR            = ( 1.0     0.0     0.0 )
         INS-226080_FOV_REF_ANGLE             = ( 8.250 )
         INS-226080_FOV_CROSS_ANGLE           = ( 8.250 )
         INS-226080_FOV_ANGLE_UNITS           = 'DEGREES'

         INS-226090_FOV_FRAME                 = 'ROS_STR-B'
         INS-226090_FOV_SHAPE                 = 'RECTANGLE'
         INS-226090_BORESIGHT                 = ( 0.0     0.0    46.0 )
         INS-226090_FOV_CLASS_SPEC            = 'ANGLES'
         INS-226090_FOV_REF_VECTOR            = ( 1.0     0.0     0.0 )
         INS-226090_FOV_REF_ANGLE             = ( 8.250 )
         INS-226090_FOV_CROSS_ANGLE           = ( 8.250 )
         INS-226090_FOV_ANGLE_UNITS           = 'DEGREES'

      \begintext


Platform ID
---------------------------------------------------------------------------

   This number is the NAIF instrument ID of the platform on which the
   detectors are mounted. For both Star Trackers this platform is the
   orbiter.

      \begindata

         INS-226080_PLATFORM_ID               = ( -226000 )
         INS-226090_PLATFORM_ID               = ( -226000 )

      \begintext

End of IK file.