PDS_VERSION_ID = PDS3 LABEL_REVISION_NOTE = " 2007-10-19: AJS Initial version " RECORD_TYPE = STREAM INSTRUMENT_HOST_NAME = "NEW HORIZONS" OBJECT = DATA_SET DATA_SET_ID = "NH-J/P/SS-SPICE-6-V1.0" OBJECT = DATA_SET_INFORMATION ABSTRACT_DESC = " This data set contains SPICE data for the New Horizons mission " CITATION_DESC = " Steffl, A.J., Peterson, J., NEW HORIZONS SPICE KERNELS, V1.0, NH-J/P-SPICE-6-V1.0, NASA Planetary Data System, 2007. " DATA_SET_NAME = "NEW HORIZONS SPICE KERNELS V1.0" DATA_SET_RELEASE_DATE = 2007-11-01 DATA_SET_TERSE_DESC = " SPICE data for the New Horizons Mission " DATA_OBJECT_TYPE = "SPICE KERNEL" DATA_SET_COLLECTION_MEMBER_FLG = "N" DETAILED_CATALOG_FLAG = "N" PRODUCER_FULL_NAME = "ANDREW J. STEFFL" ARCHIVE_STATUS = "IN PEER REVIEW" START_TIME = 2006-01-19T00:00:00 STOP_TIME = 2007-07-01T00:00:00 DATA_SET_DESC = " Data Set Overview ================= This data set includes the complete set of New Horizons (NH) SPICE data files (``kernel files''), which can be accessed using SPICE software. The SPICE data contains geometric and other ancillary information needed to recover the full value of the science instrument data. In particular SPICE kernels provide spacecraft and planetary ephemerides, instrument mounting alignments, spacecraft orientation, spacecraft sequences of events, and data needed for relevant time conversions. Data Types (SPICE kernel types) =============================== SPK kernels contain ephemerides for spacecraft, planets, satellites, comets and asteroids as well as for moving or fixed spacecraft and instrument structures. They provide position and velocity, given in a Cartesian reference frame. SPK files are located under the ``data/spk'' directory of this data set. PCK kernels contain certain physical, dynamical and cartographic constants for target bodies, such as size and shape specifications, and the orientation of the spin axis and prime meridian. PCK files are located under the ``data/pck'' directory of this data set. IK kernels (Instrument description kernels) give descriptive and operational data peculiar to a particular scientific instrument, such as internal timing relative to the spacecraft clock and field-of-view model parameters. IK files are located under the ``data/ik'' directory of this data set. CK kernels describe pointing, containing a transformation traditionally called the C-matrix which is used to determine time-tagged pointing (orientation) angles for a spacecraft structure upon which science instruments are mounted. CK files are located under the ``data/ck'' directory of this data set. LSK (Leapseconds) kernels contain the leapseconds and the values of other constants required to perform a transformation between Universal Time Coordinated (UTC) and Ephemeris time (ET). LSK files are located under the ``data/lsk'' directory of this data set. SCLK (Spacecraft Clock) kernels contain on-board clock calibration data required to perform a mapping between Ephemeris time (ET) and spacecraft on-board time (SCLK.) SCLK files are located under the ``data/sclk'' directory of this data set. FK (Frame Definitions) kernels contain information required to define reference frames, sources of frame orientation data and inter-connections between these frames and other frames supported within the SPICE system. This includes mounting alignment information for each instrument. FK files are located under the ``data/fk'' directory of this data set. Kernel File Details =================== A brief overview of the different types of New Horizons kernels included in this data set is provided in the CONFIDENCE_LEVEL_NOTE section of this file. Software ======== The SPICE Toolkit contains software modules needed to read SPICE kernel files. SPICELIB software is highly documented via internal headers. Additional documentation is available in separate ASCII text files called Required Reading files. For example, the S- and P- Kernel (SPK) Required Reading File, named SPK.REQ, describes use of the SPK kernel file readers and contains sample programs. The latest SPICE Toolkit for a variety of computer platforms such as PC, Mac, SUN, etc. is available at the NAIF Node of PDS electronically (via anonymous FTP and WWW servers). Refer to information in ``software/softinfo.txt'' for details regarding obtaining this software. Each version of the Toolkit is also archived at the NASA National Space Science Data Center. Loading Kernel Files into a SPICE-based Application =================================================== The easiest way to make data from a collection of SPICE kernels available to a SPICE-based application is to list these kernels in a meta-kernel and load it into the program using the high level SPICE data loader routine FURNSH. " CONFIDENCE_LEVEL_NOTE = " This data set contains SPICE kernel files created during mission operations and after mission data reconstruction and analysis. Some general information about this collection follows here, and additional metadata can be found within the files themselves. These metadata provide detailed information regarding the information source from which the data were derived, the type of processing applied to the source data, applicability of the data, etc. Metadata are located in the ``comment area'' for binary kernel types (SPK, CK, ESQ), accessible using either the COMMNT or SPACIT utility program found in the NAIF Toolkit. Metadata are located after ``\begintext'' markers within the text kernel types (PCK, IK, FK, LSK, SCLK), accessible by using any available text file display tool such as a word processor, text editor, or the unix ``more'' or ``cat'' commands. In some cases data accuracy information does not exist because could not be estimated even after mission completion. Where there are questions about data accuracy or ``confidence'' not addressed herein the reader is invited to examine subsequent SPICE archive releases associated with this data set (if such exist), or to contact the New Horizons Science Operations Center. SPK Files ========= The SP-Kernel files included in this dataset provide the trajectory of the New Horizons spacecraft and ephemeris data for the mission targets. Additional information about SPK files provided in this data set is available in the file ``data/spk/spkinfo.txt''. CK Files ======== C-kernel files included in this dataset provide the orientation of the New Horizons spacecraft. These CK files were produced from engineering telemetry downlinked from the spacecraft. Additional information about CK files provided in this data set is available in the file ``data/ck/ckinfo.txt''. PCK Files ========= PCK files provide size, shape and orientation data for ``target'' bodies such as planets, satellites, comets and asteroids. A description of these data items and reference to their source is provided inside the PCK file, which is a simple text file that can be viewed using any word processor, text editor or text display utility. Additional information about PCK files provided in this data set is available in the file ``data/pck/pckinfo.txt''. FK Files ======== Frames kernel files provide specifications for how one reference frame is defined relative to another frame. The NH FK provided in this data set contains a complete set of frame definitions for the spacecraft and all its science instruments. Comments in the FK file provide the frame definitions, a description of the frame relationships, the source of and accuracy of the mounting alignment information, etc. The instrument frame definitions provided in the file incorporate the latest mounting alignment data available. Additional information about FK files provided in this data set is available in the file ``data/fk/fkinfo.txt''. IK Files ======== Instrument kernel files provide specifications for the remote sensing and particles instrument parameters and -- where applicable -- field-of-view size, shape and orientation for the named instrument. Metadata describing these estimates are provided in each IK file included in this archive. Additional information about IK files provided in this data set is available in the file ``data/ik/ikinfo.txt''. SCLK Files ========== Spacecraft Clock kernel files provide a tabulation of data needed to convert time measurements between ephemeris time (ET) and spacecraft clock time (SCLK). Each newly made SCLK file fully replaces the previous SCLK file. Additional information about SCLK files provided in this data set is available in the file ``data/sclk/sclkinfo.txt''. LSK Files ========= Leapseconds kernel files provide a tabulation of ``leapseconds'' and some other terms used in converting time measurements between ephemeris time (ET) and Universal Time (UTC). ``Spacecraft Event Time'' (SCET) is the commonly used name for UTC events measured at the spacecraft. Metadata describing how the LSK data are obtained or computed is contained inside the LSK text file. The time conversion provided by SPICE LSK files is accurate to approximately 0.000030 seconds. Additional information about LSK files provided in this data set is available in the file ``data/lsk/lskinfo.txt''. " END_OBJECT = DATA_SET_INFORMATION OBJECT = DATA_SET_MISSION MISSION_NAME = "NEW HORIZONS" END_OBJECT = DATA_SET_MISSION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "WEAVERETAL2007" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "STERNETAL2007" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_TARGET TARGET_NAME = "JUPITER" END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = "IO" END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = "EUROPA" END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = "GANYMEDE" END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = "NH" INSTRUMENT_ID = "SPICE" END_OBJECT = DATA_SET_HOST END_OBJECT = DATA_SET END