PDS_VERSION_ID          = PDS3
RECORD_TYPE             = STREAM

OBJECT                  = TEXT
   INTERCHANGE_FORMAT   = ASCII
   PUBLICATION_DATE     = 2017-06-20
   NOTE                 = "This file describes the files in the
                           extras/orbnum directory of this data set."
END_OBJECT              = TEXT

END


Orbit Number Files for the JUNO Mission to Jupiter
==================================================

   This directory contains the orbit number files generated by NAIF's
   ORBNUM utility program using the reconstructed spacecraft trajectory
   SPK files for the orbital phase of the mission.
 
   The orbit number files are plain ASCII text files that have lines
   terminated with a line feed character, LF (ASCII 10).
 
   The orbit number files with the ``.orb'' extension contain data that
   follow the ``apoapsis-to-apoapsis'' orbit numbering scheme -- with
   the orbit number changing at the apoapsis.


JUNO Orbit Number Files Provided in This Data Set
=================================================

   The following JUNO orbit number files are provided in this data set
   (only name portion of the file name is shown; the extension of all
   file names is ``.orb''):

      juno_rec_orbit_vVV       orbit number files providing the orbit
                               numbers and other time and geometric
                               values for the orbital phase of the JUNO
                               mission. The file with latest version
                               number, ``VV'', supersedes all previous
                               versions.


   The information contained in the orbit number files includes the
   following, in which the "Column Title" entries are along the top of
   the orbit number file and "Meaning" describes what the column
   represents.

      Column Title             Meaning
      ---------------------    -----------------------------------
      No.                      orbit number

      Event UTC APO            apoapsis UTC time

      Event SCLK APO           apoapsis SCLK time

      OP-Event UTC PERI        periapsis UTC time

      SolLon & SolLat          planetocentric subsolar longitude and
                               latitude in the Jupiter body-fixed
                               frame defined by the Jupiter rotation
                               constants provided in the PCK file 
                               ``pck00010.tpc'', at the apoapsis time.

      SC Lon, SC Lat, & Alt    planetocentric subspacecraft longitude,
                               latitude, and altitude relative to the
                               reference ellipsoid in the body-fixed
                               frame defined by the Jupiter shape and 
                               rotation constants provided in the PCK 
                               file ``pck00010.tpc'', at the apoapsis 
                               time.
 
      Sol Dist                 Distance between Sun and Jupiter at 
                               at the apoapsis time.


   For the JUNO orbital mission, the orbit number is changing at the
   apoapses with the orbit 1 starting at the first apoapsis after 
   JOI.


Contact Information
===================

   Regarding JUNO project-specific information provided in this data
   set and for general information about the SPICE system:
   
      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