PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT INTERCHANGE_FORMAT = ASCII PUBLICATION_DATE = 2006-03-01 NOTE = "LS-Kernel Information" END_OBJECT = TEXT END General information about SPICE LS-kernels ========================================== In the SPICE system, the Leapsecond (LSK) -Kernel contains a tabulation of leapseconds and the values of other constants required to perform a transformation between Universal Time Coordinated (UTC) and Ephemeris time (ET). Leapseconds occur only 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 an LSK file can be manipulated 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. Information about obtaining the SPICE Toolkit is located in the "software" subdirectory of the main directory of this dataset. Refer to the Time Required Reading (time.req) document provided with the toolkit or available from the NAIF Node of the PDS, to get more information about time conversions supported within the SPICE system. Deep Impact LS-kernel contained in this directory ================================================= The generic LSK file naming schema is as follows: naifVVVV.tls where VVVV is the version of the file (example: "0008" is version 8); The following LSK file is provided on this volume: naif0008.tls This file is the latest generic SPICE LSK file distributed by NAIF/JPL at the time when this data set was created. Kernel File Details =================== The most detailed description of the data in an LSK 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 =================== Regarding Deep Impact project specific information provided in this data set and for general information about SPICE system: Boris Semenov (818)-354-8136 Boris.Semenov@jpl.nasa.gov or Chuck Acton (818)-354-3869 Chuck.Acton@jpl.nasa.gov address: Navigation and Ancillary Information Facility (NAIF) Jet Propulsion Laboratory MS 301-125L 4800 Oak Grove Drive Pasadena CA 91109 USA