PDS_VERSION_ID          = PDS3
RECORD_TYPE             = STREAM

OBJECT                  = TEXT
   INTERCHANGE_FORMAT   = ASCII
   PUBLICATION_DATE     = 2010-03-15
   NOTE                 = "I-Kernel Information"
END_OBJECT              = TEXT

END


General Information About SPICE I-Kernels
=========================================

   In the SPICE system, I-kernels contain field-of-view specifications,
   internal timing parameters, detector geometry specifications and
   other geometric parameters for the instrument. These parameters
   along with knowledge of the spacecraft pointing (C kernel) and
   instrument mounting alignment (Frames Kernel) allow the user to use
   SPICE APIs to calculate the view directions of the individual
   instrument pixels or detectors.

   The data contained in I-kernel files can be accessed and manipulated
   in conjunction with other data using the SPICE Toolkit APIs, calls to
   which can be integrated into user application programs. The
   information regarding how to obtain the SPICE system toolkit for a
   number of languages and computer platforms is located in the
   ``/software'' subdirectory of the main directory of this data set.

   Refer to the ``kernel.req'' document provided with the Toolkit to get
   more information on how to access I-kernel data.


MESSENGER I-kernels Provided in This Data Set
=============================================

   The following IK files are provided in this data set. Only the name
   portion of the file name is shown on the right; the extension of all
   file names is ``.ti''.

      msgr_epps_vNNN   The MESSENGER Energetic Particle and Plasma
                       Spectrometer IK file containing EPS and FIPS
                       field-of-view (FOV) specifications.

      msgr_grns_vNNN   The MESSENGER Gamma-Ray and Neutron Spectrometer
                       (GRNS) IK files containing GRS and NS FOV
                       specifications.

      msgr_mag_vNNN    The MESSENGER Magnetometer IK file. The current
                       release of the magnetometer instrument kernel
                       contains no data, although it does contain
                       platform and NAIF IDs. The FOV specifications
                       normally provided in an IK file do not make
                       sense for this instrument.

      msgr_mascs_vNNN  The Mercury Atmospheric and Surface Composition
                       Spectrometer (MASCS) Ultraviolet and Visible
                       Spectrometer (UVVS) and Visible and Infrared
                       Spectrograph (VIRS) IK file containing UVVS and
                       VIRS FOV specifications.

      msgr_mdis_vNNN   MESSENGER Mercury Dual Imaging System (MDIS) IK
                       file containing first order optical parameters,
                       FOV parameters, WAC FOV definition, and NAC FOV
                       definition.


      msgr_mla_vNNN    The Mercury Laser Altimeter (MLA) IK file
                       containing timing, beam geometry, and receiver
                       geometry parameters.

      msgr_xrs_vNNN    The MESSENGER X-Ray Spectrometer (XRS) IK file
                       containing the MXU and SAX FOV Specifications

      msgr_rs_vNNN     The MESSENGER Radio Science Experiment (RS) IK
                       file containing antenna offsets, and mode
                       parameter information.


   All IK files provided in this data set contain actual data.

   If this data set contains multiple IK files for a particular
   instrument, the one with the latest version (NNN) supersedes all
   previous versions.


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

   The most detailed description of the data in an IK file is provided
   in metadata included inside the description area of the file. This
   information can be viewed using any text editor program.


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

   Regarding MESSENGER project specific information provided in this
   data set:

      Mike Reid
      (240)-228-4537
      Mike.Reid@jhuapl.edu

   address:

      The Johns Hopkins University Applied Physics Laboratory
      11100 Johns Hopkins Road
      Laurel, MD 20723

   For general information about SPICE system:

      Charles H. Acton, Jr,
      (818)-354-3869,
      Charles.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 301-121
      4800 Oak Grove Drive
      Pasadena CA 91109 USA