PDS_VERSION_ID          = PDS3
RECORD_TYPE             = STREAM

OBJECT                  = TEXT
   INTERCHANGE_FORMAT   = ASCII
   PUBLICATION_DATE     = 2009-06-18
   NOTE                 = "LRO LS-Kernel Information"
END_OBJECT              = TEXT

END


General Information About SPICE LS-Kernels
==========================================

   In the SPICE system, Leapsecond (or LS) -kernel contains the
   leapseconds and the values of physical constants required to perform
   a transformation between Universal Time Coordinated (UTC) and
   Ephemeris time (ET).

   The information in an LSK file can be 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 ``time.req'' document provided with the toolkit to get
   more information about time conversions supported within the SPICE
   system.


LRO LS-Kernels Contained in This Data Set
=========================================

   The SPICE Leap Second File is a generic SPICE product that LRO
   receives from the NAIF/PDS repository. This file will be included
   whenever the NAIF releases a new version.  This logical product
   actually consist of two separate files based on the user's platform;
   the file contains all of the leap second adjustments and when these
   adjustments should be used.  This file supports the conversion between
   ephemeris time and UTC.

   Time interval:         NA; the file contains the specific times at
                          which a leap-second is applied.

   File duration:         NA.

   File or Data
   Generation Frequency:  Regenerated, as identified by NAIF personnel.

   Data Volume:           Variable.

   Accuracy
   (if it applies):         Associated UTC time corresponding to the
                           Leap-second is accurate to milliseconds.


   File Name Convention
   --------------------
   The generic LSK files included in the data set shall be named according
   to the following naming scheme:

   <File Name>.<File Extension>

   where

   File Name      = [8 characters] file name; is "naifNNNN" for generic
                    LSK files
                    where
                    NNNN is the version number

   File Extension = [3 characters] standard file extension for a text LSK
                    file "tls".

   The following is an example of a LSK file name:
     - Generic LSK file:    naif0009.tls


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

   The most detailed description of the data in an LSK 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 Lunar Reconnaissance Orbiter project specific information
   provided in this data set contact:

      Rick Saylor
      (301)-614-1354
      Richard.S.Saylor@nasa.gov

   address:

      NASA Goddard Space Flight Center (GSFC)
      Mail Stop 451.0
      Building 12 Room N233
      Greenbelt MD 20771