PDS_VERSION_ID          = PDS3
RECORD_TYPE             = STREAM

OBJECT                  = TEXT
   INTERCHANGE_FORMAT   = ASCII
   PUBLICATION_DATE     = 2000-01-04
   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_SPO2_GSFC            SPK file covering the whole Science
                                    Phasing Orbit 2 (SPO-2) phase of the
                                    mission, created by merging quick-look
                                    OD solution SPK files from MOLA POD
                                    Team, GSFC.
 
           MGS_SPO2                 SPK file covering the whole Science
                                    Phasing Orbit 2 (SPO-2) phase of the
                                    mission, created by merging regular OD
                                    solution SPK files from MGS NAV.
 
           MGS_SPO2_GSFC_MGM0883    SPK file covering whole SPO-2 phase of
                                    the mission, created by merging
                                    quick-look OD solution SPK files
                                    generated by MOLA POD Team, GSFC using
                                    updated gravity model mgm0883.
 
           MGS_SPO2_GSFC_MGM0890    SPK file covering whole SPO-2 phase of
                                    the mission, created by merging
                                    quick-look OD solution SPK files
                                    generated by MOLA POD Team, GSFC using
                                    updated gravity model mgm0890.
 
           MGS_SPO2_IPNG            SPK file covering the whole Science
                                    Phasing Orbit 2 (SPO-2) phase of the
                                    mission, created by merging OD solution
                                    SPK files from Inner Planet Navigation
                                    and Gravity group, JPL.
                                    
           MGS_AB2                  SPK file covering the whole
                                    Aerobraking-2 phase of the mission,
                                    created by merging regular OD solution
                                    SPK files from MGS NAV.


   -- 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
============================

   The following SPK files were recommended by the MGS project Science 
   Office to be used as "official" files to support archiving of the  
   science data by the project science instrument teams:
   
           MGS_SPO2_GSFC.BSP
           MGS_AB2.BSP
           
   Note that these files were chosen because they supposedly contained the 
   best orbital solution available at the time of archiving (summer-fall 
   1998.)


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