KPL/IK


DIM Instrument kernel
===========================================================================

   This instrument kernel (I-kernel) contains Rosetta Lander Dust
   Impact Monitor (DIM) detector and field-of-view parameters.


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

   Version 1.0 -- August 21, 2014 -- Maud Barthelemy, ESA/ESAC
                                     Boris Semenov, JPL

      Initial release.


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

   1. Rosetta Frames Definition Kernel (FK), latest version.
      
   2. ''Kernel Pool Required Reading''
   
   3. http://www.mps.mpg.de/2714344/DIM


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,
   constructed using the spacecraft ID number (-226) followed by the
   NAIF three digit ID number for DIM P (1 to 7).
   These IDs are defined in [1] as follows:

               Instrument name          ID
               --------------------   -------
               ROS_LANDER_DIM_X       -226830
               ROS_LANDER_DIM_Y       -226831
               ROS_LANDER_DIM_Z       -226832


   The remainder of the keyword is an underscore character followed by
   the unique name of the data item. For example, the boresight of
   the DIM X detector is specified by

               INS-226830_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
--------------------------------------------------------

   From [3]:

     "The Dust Impact Monitor (DIM) on board the lander Philae measures
      the dust and ice particles escaping from the surface of the
      comet~s nucleus. These particles are detected when impacting on
      the surface of the cube-shaped DIM-sensor. DIM is one of three
      sub-instruments that constitute the instrument package SESAME on
      board Rosetta~s lander Philae."

     "The cube-shaped DIM-sensor located on the top side of Philae
      detects with piezoelectric plates the particles impacting from
      three different directions. In this way it is possible to measure
      both the particles returning to the surface under the influence
      of gravity and those ejected directly from the comet~s surface."


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

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


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

   This section contains definitions for the DIM detector FOVs. These
   definitions are provided in the format required by the SPICE
   (CSPICE) function GETFOV (getfov_c).
 
   The DIM detector FOVs are defined with respect to the corresponding
   ROS_LANDER_DIM_<n> frames to be cones with the half angular extent
   of 89.9 degrees and the boresight along the +Z axis of the
   ROS_LANDER_DIM_<n> corresponding frame. These FOV definitions use
   angular extent style specification.

      \begindata

         INS-226830_FOV_FRAME          = 'ROS_LANDER_DIM_X'
         INS-226830_FOV_SHAPE          = 'CIRCLE'
         INS-226830_BORESIGHT          = ( 0.0, 0.0, 1.0 )
         INS-226830_FOV_CLASS_SPEC     = 'ANGLES'
         INS-226830_FOV_REF_VECTOR     = ( 1.0, 0.0, 0.0 )
         INS-226830_FOV_REF_ANGLE      = 89.9
         INS-226830_FOV_ANGLE_UNITS    = 'DEGREES'

         INS-226831_FOV_FRAME          = 'ROS_LANDER_DIM_Y'
         INS-226831_FOV_SHAPE          = 'CIRCLE'
         INS-226831_BORESIGHT          = ( 0.0, 0.0, 1.0 )
         INS-226831_FOV_CLASS_SPEC     = 'ANGLES'
         INS-226831_FOV_REF_VECTOR     = ( 1.0, 0.0, 0.0 )
         INS-226831_FOV_REF_ANGLE      = 89.9
         INS-226831_FOV_ANGLE_UNITS    = 'DEGREES'

         INS-226832_FOV_FRAME          = 'ROS_LANDER_DIM_Z'
         INS-226832_FOV_SHAPE          = 'CIRCLE'
         INS-226832_BORESIGHT          = ( 0.0, 0.0, 1.0 )
         INS-226832_FOV_CLASS_SPEC     = 'ANGLES'
         INS-226832_FOV_REF_VECTOR     = ( 1.0, 0.0, 0.0 )
         INS-226832_FOV_REF_ANGLE      = 89.9
         INS-226832_FOV_ANGLE_UNITS    = 'DEGREES'

      \begintext


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

   This number is the NAIF instrument ID of the platform on which the
   detectors are mounted. For all detectors this platform is the lander.

      \begindata

         INS-226830_PLATFORM_ID  = ( -226800 )
         INS-226831_PLATFORM_ID  = ( -226800 )
         INS-226832_PLATFORM_ID  = ( -226800 )

      \begintext

End of IK file.