PDS_VERSION_ID          = PDS3
RECORD_TYPE             = STREAM

OBJECT                  = TEXT
   INTERCHANGE_FORMAT   = ASCII
   PUBLICATION_DATE     = 2000-01-15 
   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 C-kernels.  The pointing of
   a platform or an instrument is often expressed in terms of a
   transformation matrix from some standard inertial 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 FORTRAN 77 subroutines which are part of the
   SPICELIB library. These subroutines can be integrated into user
   application programs. The SPICE system toolkit for a number of
   computer platforms or information regarding how it can be obtained
   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 a project-defined
   frames, a Frame Definitions File is required.
   
   Refer to the CK.REQ document provided with the toolkit or available
   from the NAIF Node of PDS if SPICE toolkit is not included with
   this data set to get more information on how to access C-kernel
   data.


MGS C-kernels contained on this volume
======================================

   The following MGS C-kernels are provided in this volume (only name 
   portion of the file name is shown on the right; the extension of all 
   file names is ".BC"):
   
   -- MGS Spacecraft Orientation CK Files:
   
           MGS_SC_MAP2            spacecraft orientation CK file covering
                                  4th, 5th and 6th 28-day mapping cycles of
                                  the mapping phase of the mission, created
                                  by merging regular daily SC CK files from
                                  SC Team at LMA, containing orientation
                                  data partially corrected for time bias;
 
 
   -- MGS Solar Array Orientation CK Files:
 
           MGS_SA_MAP2            solar array orientation CK file covering
                                  4th, 5th and 6th 28-day mapping cycles of
                                  the mapping phase of the mission, created
                                  by merging regular daily SA CK files from
                                  SC Team at LMA;
 
           MGS_SA_HINGE_STEADY    -Y Solar Array broken hinge deflection CK
                                  file for the MAG Team.
                                  
                                  
   -- MGS High Gain Antenna Orientation CK Files:
 
           MGS_HGA_HINGE          HGA deployment hinge rotation CK file.

           MGS_HGA_MAP2           high gain antenna gimbal orientation CK
                                  file covering 4th, 5th and 6th 28-day
                                  mapping cycles of the mapping phase of
                                  the mission, created by merging regular
                                  daily HGA CK files from NAIF;
 
            
   The C-Kernels included on this CD-ROM contain actual orientation data 
   in most cases based on values obtained from the spacecraft engineering 
   telemetry.

  
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 utility programs COMMNT and 
   SPACIT included into the NAIF Toolkit.

  
Contact Information
===================

   Regarding MGS project specific information provided in this
   data set and for general information about SPICE system:
   
      Charles H. Acton, Jr, 
      (818)-354-3869, 
      Chuck.Acton@jpl.nasa.gov, 
      
   or 
   
      Boris Semenov 
      (818)-354-8136 
      Boris.Semenov@jpl.nasa.gov
      
   address:
   
      Navigation and Ancillary Information Facility (NAIF)
      Jet Propulsion Laboratory
      MS 301-125L
      4800 Oak Grove Drive
      Pasadena CA 91109 USA