Data Set Overview
      =================

      Version 1.1
      -----------
      The SEDR based data provided as part of this data set were
      originally reviewed and archived with the NSSDC and PDS as
      version 1.0 (DATA_SET_ID = VG2-J-POS-4-48.0SEC). Version 1.1
      includes additional columns not present in the previous
      version, 96 second rather than 48 second time samples, times
      converted to 'PDS Style' or 'Zulu time', and upgrading of PDS
      labels and templates to version 3.4. The SPICE based data that
      are also part of this data set were not previously archived
      with the PDS. This version 1.1 data set replaces previously
      archived versions.

      Data Set Description
      --------------------
      This data set consists of Voyager 2 Jupiter encounter
      ephemeris data in System III (1965) left handed coordinates
      covering the period 1979-07-05 to 1979-08-12. Two versions,
      both covering the same time period, but containing slightly
      different data, are provided. One version was generated by the
      Voyager MAG team from Voyager 2 SEDR, the other by the PDS/PPI
      node using the VG2_JUP.BSP and PCK00003.TCP SPICE kernels.

      Due to inaccuracies in Voyager SEDR, as well as changes in the
      values of some key parameters (e.g. Jovian radius) the timing
      is improved for the SPICE generated data. However, since much
      of the original analysis was based upon the SEDR generated
      ephemeris, this data has been included as well.

      SEDR generated ephemeris
      ------------------------
      Instrument P.I.       : N/A
      Data Supplier         : NSSDC
      Data sampling rate    : 96 seconds
      Data Set Start Time   : 1979-07-05T00:00:47.269Z
      Data Set Stop Time    : 1979-08-12T16:54:20.608Z

      SPICE generated ephemeris
      -------------------------
      Instrument P.I.       : N/A
      Data Supplier         : S. Joy
      Data sampling rate    : 48 seconds
      Data Set Start Time   : 1979-07-05T00:00:47.269Z
      Data Set Stop Time    : 1979-08-12T16:55:08.608Z

      Parameters
      ==========

      SEDR generated ephemeris
      ------------------------
      PARAMETER  RESOLUTION/  DESCRIPTION
      NAME       UNITS

      time       96.0 Sec     time of the sample (UT) in the format
                              yyyy-mm-ddThh:mm:ss.sssZ

      m65536     counts       spacecraft clock counts
      mod60      counts
      fds_line   counts

      sc_x       R[J]         jovicentric (System III) cartesian
      sc_y       R[J]         cartesian position vectors: X, Y, and
      sc_z       R[J]         Z

      vel_x      km/s         jovicentric X, Y, and Z spacecraft
      vel_y      km/s         velocity components
      vel_z      km/s

      sc_r       R[J]         jovicentric (System III) spherical
      sc_lat     degrees      coordinates position vectors: range,
      sc_lon     degrees      latitude, and longitude

      CartSys3_to_SphSys3     cartesian system III to spherical
                              system III coordinates rotation matrix
                              containing 9 1pe15.8 elements

      SC_to_CartSys3          payload (spacecraft) to cartesian
                              system III coordinates rotation matrix
                              containing 9 1pe15.8 elements

      SC_to_SphSys3           payload (spacecraft) to spherical
                              system III coordinates rotation matrix
                              containing 9 1pe15.8 elements

      SPICE generated ephemeris
      -------------------------
      PARAMETER  RESOLUTION/  DESCRIPTION
      NAME       UNITS

      time       48.0 Sec     time of the sample (UT) in the
                              format yyyy-mm-ddThh:mm:ss.sssZ

      R          AU           jovicentric (System III 1965)
      LAT        degrees      spherical coordinates position
      LON        degrees      range, latitude, and longitude

      LocTime    hours        angular separation between the
                              meridian containing the sun and the
                              one containing the spacecraft
                              converted to a time. The sun meridian
                              is defined to be noon (12.000), with
                              midnight (0.000) opposite it. Dawn
                              (6.000) and dusk (18.000) are where
                              the sun rises and sets according to
                              the planet's rotation

      Coordinate System
      =================
      The System III (1965) is a jovicentric left handed coordinate
      system defined such that longitude increases with time as
      viewed by a stationary remote observer.

      Jovicentric cartesian (Jupiter fixed) coordinates

      X      points along the Jupiter-Sun line in the solar
             equatorial plane (positive towards the Sun)

      Y      completes the right handed set

      Z      points along the jovian spin axis, positive

      Jovicentric System III (1965) spherical coordinates

      R      Jupiter to spacecraft range (positive away from
             Jupiter)

      LAT    completes the left handed, orthogonal set

      LON    System III (1965) east longitude (with longitude
             increasing eastward from a specific jovian prime
             meridian)

      SPICE ephemeris were generated using the current definition of
      the Jovian radius, 71492 km. The spin rate used in generating
      these data is the same as that used for System III (1965),
      +870.536 degrees/24 hours.

      Data Coverage
      =============
Filename         Records         Start                     Stop
-------------------------------------------------------------------
Volume ID: VG_1502
 SEDR_S3_96S.TAB 31288  1979-07-05T00:00:47.269Z  1979-08-12T16:54:20.608Z
SPICE_S3_48S.TAB 62578  1979-07-05T00:00:47.269Z  1979-08-12T16:55:08.608Z

Confidence Level Overview
      =========================

      SPICE generated ephemeris
      -------------------------
      The SPICE generated data were derived from SPICE using
      software that has been extensively tested. They should give as
      accurate representation of spacecraft ephemeris as possible
      using these kernels.

      Comparisons between these data and other data from previous
      Jupiter missions should be performed with caution. Some key
      parameters, such as the Jovian radius, have changed from
      mission to mission. Definitions for Jupiter's spin rate and
      the orientation of its spin-axis have also changed slightly
      since the early Pioneer days.

      Missing Data Flag
      =================
      Any SEDR generated ephemeris data column whose value is
      -9.99999999e+10 is a missing data value.