KPL/FK

``Bare-bones'' Grail Spacecraft Frame Definition FK
===============================================================================

   This frame kernel contains the frame definition for the Grail
   spacecraft frames.


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

   Version 0.0 -- June 26, 2007 -- Boris Semenov, NAIF

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

   Boris V. Semenov, NAIF/JPL, (818)-354-8136, Boris.Semenov@jpl.nasa.gov


Grail Frames
-------------------------------------------------------------------------------

   The following Grail frames are defined in this kernel file:

           Name                  Relative to           Type       NAIF ID
      ======================  =====================  ============   =======

   Spacecraft frame:
   -----------------
      GRAIL-A_SPACECRAFT      rel.to J2000           CK             -651000
      GRAIL-B_SPACECRAFT      rel.to J2000           CK             -652000



Grail Spacecraft Frame
-------------------------------------------------------------------------------

   The spacecraft frame is defined by the s/c design as follows:

      -  Z axis is TBD;
 
      -  Y axis is TBD

      -  X axis completes the right hand frame;

      -  the origin of the frame is TBD.

   These diagrams illustrates the s/c frame:

      TBD

   Since the S/C bus attitude with respect to an inertial frame is
   provided by a CK kernel, this frame is defined as a CK-based frame.

   \begindata

      FRAME_GRAIL-A_SPACECRAFT     = -651000
      FRAME_-651000_NAME           = 'GRAIL-A_SPACECRAFT'
      FRAME_-651000_CLASS          = 3
      FRAME_-651000_CLASS_ID       = -651000
      FRAME_-651000_CENTER         = -651
      CK_-651000_SCLK              = -651
      CK_-651000_SPK               = -651

      FRAME_GRAIL-B_SPACECRAFT     = -652000
      FRAME_-652000_NAME           = 'GRAIL-B_SPACECRAFT'
      FRAME_-652000_CLASS          = 3
      FRAME_-652000_CLASS_ID       = -652000
      FRAME_-652000_CENTER         = -652
      CK_-652000_SCLK              = -652
      CK_-652000_SPK               = -652

   \begintext


GRAIL Name-ID Mappings
-------------------------------------------------------------------------------
   
   This section contains name to NAIF ID mappings for the GRAIL mission.
   Once the contents of this file is loaded into the KERNEL POOL, these
   mappings become available within SPICE, making it possible to use
   names instead of ID code in the high level SPICE routine calls.

   \begindata

      NAIF_BODY_NAME += ( 'GRAIL-A'                 )
      NAIF_BODY_CODE += ( -651                      )

      NAIF_BODY_NAME += ( 'GRAIL-B'                 )
      NAIF_BODY_CODE += ( -652                      )

   \begintext