KPL/FK

Frame (FK) kernel file for EnVision Venus-Nadir Power Optimized
===============================================================================

   This frames kernel overwrites the EnVision spacecraft frame 
   (ENVISION_SPACECRAFT) definition from [3] and maps it to the EnVision 
   Venus power optimized frame (ENVISION_VENUS_NPO) defined in [3].
   
   This allows the user to use the existing alignments and instrument frame
   definitions in the EnVision frames kernel (see ref [3]) to perform 
   instrument specific mission analysis and attitude dependent science 
   opportunity identification. Please refer to the section ``Using this 
   frame'' for further details.
   
   NOTE THAT BY USING THIS KERNEL, THE ENVISION_SPACECRAFT FRAME WILL BE
   MAPPED TO THE ENVISION_VENUS_NPO FRAME, AND ANY CK PROVIDING ORIENTATION 
   FOR THE ENVISION_SPACECRAFT FRAME WILL NOT BE USED BY THE APPLICATION 
   SOFTWARE, EVEN IF IT IS LOADED IN THE KERNEL POOL.
   
   
Version and Date
-------------------------------------------------------------------------------

   Version 0.1 -- February 10, 2023 -- Ricardo Valles Blanco, ESAC/ESA

      Corrected typos.

   Version 0.0 -- January 2, 2016 -- Marc Costa Sitja, ESAC/ESA
   
      Initial version.
      

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

   [1]   "Frames Required Reading"
   
   [2]   "Kernel Pool Required Reading"
   
   [3]   EnVision Frames Definition Kernel (FK), latest version.

         
Contact Information
-------------------------------------------------------------------------------

   If you have any questions regarding this file contact the
   ESA SPICE Service (ESS) at ESAC:

           Alfredo Escalante Lopez
           (+34) 91-8131-429
           spice@sciops.esa.int

     
Implementation Notes
-------------------------------------------------------------------------------

   This file is used by the SPICE system as follows: programs that make
   use of this frame kernel must "load" the kernel normally during 
   program initialization. Loading the kernel associates the data items 
   with their names in a data structure called the "kernel pool". The 
   routine that loads a kernel into the pool is shown below:
                                                                               
      FORTRAN: (SPICELIB)

         CALL FURNSH ( frame_kernel_name )

      C: (CSPICE)

         furnsh_c ( frame_kernel_name );

      IDL: (ICY)

         cspice_furnsh, frame_kernel_name
         
      MATLAB: (MICE)
      
         cspice_furnsh ( 'frame_kernel_name' )

   This file was created and may be updated with a text editor or word
   processor.
   

Using this frame
-------------------------------------------------------------------------------

   This frames have been implemented to overwrite the ENVISION_SPACECRAFT
   frame definition provided in the EnVision Frames Definitions kernel
   ([3]) and map it to the ENVISION_VENUS_NPO frame defined in the Hera Frames
   Definitions kernel.
   
   In order to make use of this frames kernel, this file MUST BE LOADED
   AFTER the EnVision frames definition kernel.
   
   A metakernel defined to use this file should look like this:
      
         ...
         
              $DATA/fk/envision_v00.tf
              $DATA/fk/envision_sc_venus_npo_v00.tf
         
         ...


   NOTE THAT BY USING THIS KERNEL, THE ENVISION_SPACECRAFT FRAME WILL BE
   MAPPED TO THE ENVISION_VENUS_NPO FRAME, AND ANY CK PROVIDING ORIENTATION FOR
   THE ENVISION_SPACECRAFT FRAME WILL NOT BE USED BY THE APPLICATION SOFTWARE,
   EVEN IF IT IS LOADED IN THE KERNEL POOL.


  \begindata
  
      FRAME_-668000_CLASS       =  4
      TKFRAME_-668000_RELATIVE  = 'ENVISION_VENUS_NPO'
      TKFRAME_-668000_SPEC      = 'MATRIX'
      TKFRAME_-668000_MATRIX    = ( 1   0   0
                                    0   1   0
                                    0   0   1 )
   
  \begintext