PDS_VERSION_ID       = PDS3                                                   
RECORD_TYPE          = FIXED_LENGTH                                           
RECORD_BYTES         = 80                                                     
OBJECT               = TEXT                                                   
  PUBLICATION_DATE   = 1999-01-14                                             
  NOTE               = "This file describes the contents of this directory."  
END_OBJECT           = TEXT                                                   
END                                                                           
                                                                              
                                                                              
This directory contains Galileo Orbiter orbit and attitude (orientation) data 
in the form of SPICE kernels. The SPICE kernels are provided in two formats   
PC and Sun Solaris. These kernels are provided in this product both for       
completeness and to ensure that the kernels used in the processing of the     
data are included in the archive. The official archive of the Galileo SPICE   
products is maintained by the Navigation and Ancillary Information Facility   
(NAIF) at the Jet Propulsion Laboratory (JPL) in Pasadena CA. SPICE kernels   
can be obtained from the NAIF Node of the PDS for numerous platforms in       
addition to those provided here.                                              
                                                                              
In addition to being the PDS archive site for the SPICE kernels, NAIF         
provides and maintains a software toolkit (SPICELIB) for accessing            
the kernels. For more information about NAIF, SPICELIB, or to acquire         
kernels for platforms not support here, please visit the NAIF website         
(http://pds.jpl.nasa.gov/naif.html). The DOCUMENT directory on this           
cdrom describing the SPICE concept.                                           
                                                                              
Software will be available from the PPI Node in the future that               
will allow users access the SPICE kernels and perform simple data             
manipulations using them. This software will be available for both            
PC and Sun Solaris platforms. It will allow users to rotate vectors           
between various geophysical coordinate systems and/or to generate             
spacecraft trajectory data in those coordinate systems. This software         
was not complete at the time this cdrom was produced.                         
                                                                              
Ephemeris data in tabular form can be found in the subdirectories of          
DATA/TRAJECT. Spacecraft ephemeris tables are available in both Jupiter       
and Io centered coordinates. These trajectory files are derived from          
the SPICE kernels on this disk.                                               
                                                                              
                                                                              
EJCRUISE.BSP (Spacecraft/Planetary/Satellite Ephemerides kernel)              
LEAP_SEC.TLS (Leapseconds kernel)                                             
P_CONST.TPC  (Planetary Constants kernel)                                     
GLL_SCLK.TSC (Spacecraft clock kernel)                                        
                                                                              
                                                                              
SPICE kernel contents:                                                        
                                                                              
Spacecraft/Planet    EJCRUISE.BSP    Reconstruction of interplanetary mission 
Leapseconds          LEAP_SEC.TLS    Through February 22, 1997                
Planetary Constants  P_CONST.TPC     IAU report 1994                          
Spacecraft Clock     GLL_SCLK.TSC    Through July 24, 1994