PDS_VERSION_ID          = PDS3
RECORD_TYPE             = STREAM

OBJECT                  = TEXT
   INTERCHANGE_FORMAT   = ASCII
   PUBLICATION_DATE     = 2000-01-15
   NOTE                 = "SP-Kernel Information"
END_OBJECT              = TEXT
                                                                     
END 

General information about SPICE SP-kernels
==========================================

   The purpose of the SP-kernel -- which stands for S(pacecraft) and
   P(lanet) Kernel -- is to allow ephemerides for any collection of
   solar system bodies, spacecraft or any other objects in 3D space
   to be combined under a common file format, and accessed by a common
   set of subroutines.
   
   The SPK format is supported by a collection of subroutines that
   are part of the SPICELIB library, the major component of the NAIF
   Toolkit. 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 SP-kernels, a Leapseconds (LSK) is required.  Also, to use
   SP-Kernels containing positions given relative to the non-inertial
   and project-defined frames, a Frame Definitions (FRAMES) and
   Planetary Constants (PcK) files are required.
   
   Refer to the SPK.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 SP-kernel data.


MGS SP-kernels provided on this volume
======================================

   The following MGS SP-kernels are provided on this volume (only name 
   portion of the file name is shown on the right; the extension of all 
   file names is ".bsp"):
   
   -- MGS Spacecraft Trajectory SPK files:
   
           MGS_MAP1                   SPK file covering the 1st, 2nd and
                                      3rd 28-day mapping cycles of the
                                      mapping phase of the mission, created
                                      by merging regular reconstructed OD
                                      solution SPK files from MGS NAV.
 
           MGS_MAP1_GSFC_MGM0890I     SPK file covering the 1st, 2nd and
                                      3rd 28-day mapping cycles of the
                                      mapping phase of the mission, created
                                      by merging quick-look OD solution SPK
                                      files version 10 from MOLA POD Team,
                                      GSFC.
 
           MGS_MAP1_GSFC_MGM0964C20   SPK file covering the 1st, 2nd and
                                      3rd 28-day mapping cycles of the
                                      mapping phase of the mission, created
                                      by merging quick-look OD solution SPK
                                      files version 13 from MOLA POD Team,
                                      GSFC.
 
           MGS_MAP1_IPNG_MGS75B       SPK file covering the 1st, 2nd and
                                      3rd 28-day mapping cycles of the
                                      mapping phase of the mission, created
                                      by merging MGS75B OD solution SPK
                                      files from Inner Planet Navigation
                                      and Gravity group, JPL.
 
           MGS_MAP1_IPNG_MGS75C       SPK file covering the 1st, 2nd and
                                      3rd 28-day mapping cycles of the
                                      mapping phase of the mission, created
                                      by merging MGS75C OD solution SPK
                                      files from Inner Planet Navigation
                                      and Gravity group, JPL.
 

   -- MGS Spacecraft Structures Fixed Offset SPK files:
   
           MGSSTRUCT_HGA              SPK file containing location of the 
                                      HGA structures with respect to each 
                                      other.
           
           MGSSTRUCT_MAGER            SPK file containing location of the 
                                      MGA Solar Array structures and MAG 
                                      Sensors with respect to each other.
                                    

   -- Solar System Bodies Ephemeris data SPK file:
   
            MAR033                    SPK file containing JPL's Development 
                                      Ephemerides (DE) 405 and Mars 
                                      Satellite Ephemerides (MAR) MAR033.7.
                                    
   All this data is actual (reconstructed).
   
   
SPK Files Used for Archiving
============================

   Though the MGS project Science Office deemed the MGS NAV OD solution 
   
           MGS_MAP1.BSP
           
   as "official" for all preliminary science data processing, most 
   MGS spacecraft trajectory SPKs listed above were available to and could 
   have been used by the science teams at the time of initial data 
   reduction/archiving activities.


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

   The most detailed description of the data in each SPK 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