PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT INTERCHANGE_FORMAT = ASCII PUBLICATION_DATE = 2003-10-15 NOTE = "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). Leapseconds usually occur at the New Year or the end of June. The user should check with NAIF/JPL regularly to keep up to date about leapseconds. The information in LSK file can be manipulated by a collection of FORTRAN 77 subroutines to provide required time system transformation. These subroutines are part of the SPICELIB library and 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 data set. Refer to the TIME.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 about time conversions supported within the SPICE system. DS1 LS-kernel contained in this directory ========================================= The following LSK file is provided on this volume: naif0007.tls This file is the latest generic SPICE LSK file distributed by NAIF/JPL at the time when this data set was created. This leapseconds file reflects the January 1, 1999 leapsecond. 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 DS1 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