PDS_VERSION_ID          = PDS3
RECORD_TYPE             = STREAM

OBJECT                  = TEXT
   INTERCHANGE_FORMAT   = ASCII
   PUBLICATION_DATE     = 2010-10-26
   NOTE                 = "C-Kernel Information"
END_OBJECT              = TEXT

END


General information about SPICE C-kernels
=========================================

   In the SPICE system, pointing data for an instrument platform, or
   for a specific instrument, are stored as C-kernels (CK).  The
   pointing of a platform or an instrument is often expressed in terms
   of a transformation matrix from some standard base reference frame
   to a instrument-fixed frame. In the past, the instrument was often a
   camera, and the transformation was thus dubbed the ``C-matrix'';
   hence the choice of C as the name for the pointing kernel.

   The data contained in C-kernel files can be accessed and manipulated
   by a collection of subroutines that are part of the SPICELIB
   library, the major component of the SPICE Toolkit. These subroutines
   can be integrated into user application programs. Information about
   obtaining the SPICE Toolkit is located in the ``software''
   subdirectory of the main directory of this dataset.

   To use C-kernels, a Spacecraft Clock Kernel (SCLK) is required.
   Also, for C-Kernels containing orientation of project-defined
   frames, a Frame Kernel file is required.

   Refer to the CK Required Reading (ck.req) document provided with the
   Toolkit or available from the NAIF Node of the PDS, to get more
   information on how to access C-kernel data.


Hayabusa C-kernels Contained in This Data Set
=============================================

   This directory contains the SPICE C-kernel files for the Hayabusa
   mission. All files are in IEEE big endian binary format.

   The following CK files are provided in this directory (only the
   leading portion of the file name is shown; the extension of all CK
   file names is ``.bc''):

      hayabusa_YYYYMMDD_yyyymmdd_v01   CK files containing Hayabusa
                                       spacecraft orientation, covering
                                       short periods of the surveying
                                       and collection phase of the
                                       mission, created during
                                       operations by the Hayabusa Joint
                                       Science Team. YYYYMMDD and
                                       yyyymmdd in the file name
                                       identify the period covered by
                                       the file.

      hayabusa_itokawarendezvous_v01   CK file containing Hayabusa
                                       spacecraft orientation, covering
                                       most of the surveying and
                                       collection phase of the mission,
                                       created at the end of the phase
                                       by the Hayabusa Joint Science
                                       Team.

      hayabusa_itokawarendezvous_v02   CK file containing Hayabusa
                                       spacecraft orientation, covering
                                       most of the surveying and
                                       collection phase of the mission,
                                       created at the end of the phase
                                       by the Hayabusa Joint Science
                                       Team. The original name of this
                                       file was 20050902-20051126_att.bc.

      hayabusa_itokawarendezvous_v02n  CK file containing Hayabusa
                                       spacecraft orientation, covering
                                       most of the surveying and
                                       collection phase of the mission,
                                       created by NAIF at the time of
                                       archive preparation by
                                       re-packaging and touching up the
                                       data from the CK file
                                       hayabusa_itokawarendezvous_v02.
                                       bc.

   In most cases only the CK file

      hayabusa_itokawarendezvous_v02n.bc

   should be loaded into a user's application to process data for
   the surveying and collection phase of the mission.


Kernel File Details
===================

   The most detailed description of the data in a binary CK file is
   provided in metadata included inside the comment area of the file.
   This information can be viewed using the utility programs COMMNT and
   SPACIT included in the SPICE Toolkit. The Toolkit is available from
   the NAIF website.