PDS_VERSION_ID          = PDS3
RECORD_TYPE             = STREAM

OBJECT                  = TEXT
   INTERCHANGE_FORMAT   = ASCII
   PUBLICATION_DATE     = 2012-12-21
   NOTE                 = "SCL-Kernel Information"
END_OBJECT              = TEXT

END


General information about SPICE SCL-kernels
===========================================

   In the SPICE system, Spacecraft Clock (or SCL) -kernel contains a
   set of information required to perform a mapping between Ephemeris
   time (ET) and spacecraft on-board time (SCLK).
 
   The spacecraft clock coefficient information contained in the SCLK
   files can be manipulated 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 ``sclk.req'' document provided with the toolkit to get
   more information about conversion between ET and spacecraft clock
   times.


NEAR SCL-kernel Provided in This Data Set
=========================================

   This data set contains a single NEAR SCLK file covering the entire
   NEAR mission time range:

      near_171.tsc

   This SCLK file contains actual NEAR on-board clock to ET mapping
   coefficients computed using time calibration packets from the
   spacecraft engineering telemetry.


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

   The most detailed description of the data in an SCLK file is
   provided in metadata included inside the descriptive text areas
   within the file. This information can be viewed using any text
   editor.


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

   For NEAR specific information, contact:

      NEAR Science Data Center
      Howard W. Taylor
      The Johns Hopkins University
      Applied Physics Laboratory
      11100 Johns Hopkins Road
      Laurel MD 20723
      Email: Howard.Taylor@jhuapl.edu

   For general information about the 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