PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 1998-05-01 NOTE = "EXTRINFO.TXT describes the contents of this directory." END_OBJECT = TEXT END The directory 'SPICE' contains the SPICE Leapseconds and Planetary Constants kernels. EBCDIC (PC binary) and IEEE (Sun, HP, SGI, NeXT, and Macintosh binary) versions of the SPICE SPK kernel for the Voyager 1 Jupiter encounter are provided in separate sub-directories named for the platform for which the SPK kernel is formatted. The SPK kernels cover the dates 1979-02-05 to 1979-04-08, and include ephemeris information for Jupiter, Metis, Adrastea, Thebe, Amalthea, Callisto, Ganymede, Europa, Io, Earth, Moon, the Sun, and the Barycenter for all nine major planets as well as for the Voyager 1 spacecraft. SPICE SPK kernels allow computation of the position and velocity (the state vector) of any one of the 'bodies' described relative to any of the others. The state returned can be geometric (no corrections) or corrected for light time and/or stellar aberration. The state vector is returned in any of a number of inertial or body fixed reference frames, as selected by the user; examples are B1950, J2000 and IAU_JUPITER (Sytem III). Getting state vectors, including the conversion to Jupiter System III coordinates if requested, is accomplished using NAIF Toolkit software. For more information regarding SPICE or obtaining the NAIF Toolkit, please contact Chuck Acton (INTERNET: cacton@spice.jpl.nasa.gov, DECNET: NAIF::CACTON, PHONE: (818) 354-3869) or check the PDS website's (http://pds.jpl.nasa.gov) link to the NAIF node for current NAIF contact information. The geometry information provided on this volume only includes the SPICE SPK file (containing spacecraft and target body ephemeris). As of the date of publication of this volume, no spacecraft orientation data were available. The PDS/NAIF node is in the process of restoring spacecraft orientation information for the SPICE pointing kernel (C-kernel). NAIF plans to make this kernel available in a future archive. For information regard the availability of the Voyager 1 SPICE C-kernel, please contact Chuck Acton as described above. The PDS/PPI node is in the process of preparing a data set that will contain the spacecraft orientation information relevant to PRA and other Voyager instruments for which spacecraft orientation is important. This data set will be archived in a future volume. For information regarding the availability of this data set, please contact PDS Operator at the PDS/PPI node (INTERNET: pds_operator@igpp.ucla.edu, PHONE: (310) 206-6073). [SPICE] | |- DATASET.TXT describes the SPICE data included on this CD | |- GEOMINFO.TXT (this file) describes directory contents | |- LEAPSECS.KER SPICE Leapseconds kernel containing a tabulation of | leapseconds; used in time conversions when processing | other SPICE files, such as SPK and PCK | |- LEAPSECS.LBL PDS label for LEAPSECS.KER | |- PCONST.KER Planetary Constants kernel (PCK) providing selected | physical and cartographic constants for planets and | satellites; typically used to convert position | measurements into a body-fixed reference frame | |- PCONST.LBL PDS label for PCONST.KER | |- [PC] contains the PC binary version of the Voyager 1 | Jupiter Encounter SPK kernel (VG1_JUP.SPK) | |- [SUN] contains the Sun binary (IEEE) version the the Voyager 1 Jupiter Encounter SPK kernel (VG1_JUP.SPK)