PDS_VERSION_ID          = PDS3
RECORD_TYPE             = STREAM

OBJECT                  = TEXT
   INTERCHANGE_FORMAT   = ASCII
   PUBLICATION_DATE     = 2007-02-20 
   NOTE                 = "MGS 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 or C functions which are part of the CSPICE
   library. These subroutines/functions 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 data set.
   
   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; the extension of all file names
   is ".bc"):

   -- MGS Spacecraft Orientation CK Files:

           mgs_sc_[PHASE][_vV]    spacecraft orientation CK files
                                  covering the whole or a portion of a
                                  particular phase of the mission,
                                  created by merging regular daily SC
                                  CK files produced by the SC Team at
                                  LMA, containing orientation data
                                  partially corrected for time bias.
                                  Refer to the CK coverage table
                                  provided below to find out coverage
                                  of a particular CK file.

           mgs_ext_roto_all[_vV]  predict spacecraft orientation CK
                                  files for ``ROTO'' observations
                                  during the Extended and Extended-
                                  Extended phases of the mission.

   -- MGS Solar Array Orientation CK Files:

           mgs_sa_[PHASE][_vV]    solar array orientation CK files
                                  covering the whole or a portion of a
                                  particular phase of the mission,
                                  created by merging regular daily SA
                                  CK files produced by the SC Team at
                                  LMA.

           mgs_sa_hinge_steady[_vV]  -Y Solar Array broken hinge
                                  deflection CK file.


   -- MGS High Gain Antenna Orientation CK Files:

           mgs_hga_[PHASE][_vV]   high gain antenna gimbal orientation
                                  CK files covering the whole or a
                                  portion of a particular phase of the
                                  mission, created by merging regular
                                  daily HGA CK files produced by NAIF.
 
           mgs_hga_hinge[_vV]     HGA deployment hinge rotation CK file.

           mgs_hga_gimbal_stowed  HGA gimbal orientation CK files covering 
                                  the period prior to the HGA deployment
                                  (launch to 1999-03-28).
             
   If more than one CK of a particual kind is present for a given time
   interval, the file with the latest version, [_vV], superseeds all
   earlier versions.


MGS CK Coverage Table
=====================

   This table summarizes coverage of the MGS CK files provided on this 
   volume:

           [PHASE]   Map.    Start      Stop    
            token   Cycles    Date      Date    
          --------- ------ ---------- ----------
            cru       ---   1996-11-23 1997-08-23
            ab1       ---   1997-09-13 1998-03-26
            spo1      ---   1998-03-26 1998-05-28
            spo2      ---   1998-05-28 1998-09-22
            ab2       ---   1998-09-23 1999-03-08
            map1      1-3   1999-03-09 1999-06-01
            map2      4-6   1999-06-02 1999-08-24
            map3      7-9   1999-08-25 1999-11-16
            map4     10-12  1999-11-17 2000-02-08
            map5     13-15  2000-02-09 2000-05-02
            map6     16-18  2000-05-03 2000-07-25
            map7     19-21  2000-07-26 2000-10-17
            map8     22-25  2000-10-18 2001-01-31
            ext1     25-27  2001-02-01 2001-04-03
            ext2     28-30  2001-04-04 2001-06-26
            ext3     31-33  2001-06-27 2001-09-18
            ext4     34-36  2001-09-19 2001-12-11
            ext5     37-39  2001-12-12 2002-03-05
            ext6     40-42  2002-03-06 2002-05-28
            ext7     43-45  2002-05-29 2002-08-20
            ext8     46-48  2002-08-21 2002-11-12
            ext9     49-51  2002-11-13 2003-02-04
            ext10    52-54  2003-02-05 2003-04-29
            ext11    55-57  2003-04-30 2003-07-22
            ext12    58-60  2003-07-23 2003-10-14
            ext13    61-63  2003-10-15 2004-01-06
            ext14    64-66  2004-01-07 2004-03-30
            ext15    67-69  2004-03-31 2004-06-22
            ext16    70-72  2004-06-23 2004-09-14
            ext17    73-75  2004-09-15 2004-12-07
            ext18    76-78  2004-12-08 2005-03-01
            ext19    79-81  2005-03-02 2005-05-25
            ext20    82-84  2005-05-26 2005-08-16
            ext21    85-87  2005-08-17 2005-11-08
            ext22    88-90  2005-11-09 2006-01-31
            ext23    91-93  2006-02-01 2006-04-25
            ext24    94-96  2006-04-26 2006-07-18
            ext25    97-99  2006-07-19 2006-10-10
            ext26      100  2006-10-11 2006-11-03

  
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 

