Data Set Overview
  =================
     This dataset contains Voyager 2 position vectors relative to the Sun
     in both cartesian and spherical Heliographic coordinates for the time
     period when Voyager was near Neptune but not within its magnetosphere.
     The magnetospheric gap in this dataset occurs
     from 1989-08-25 02:00 -> 1989-08-26 00:00. Spacecraft position
     vectors are given in Neptune Longitude System (NLS) coordinates in
     this interval. The position vectors are given every 48 seconds. The
     units of the vector components are Au and degrees.  Vectors are stored
     as 4-byte floating point values.

     The Heliographic coordinate system is defined in the reference epoch of
     1950. The unit vectors which define the coordinate system are as follows:
     X points away from the Sun toward the ascending node, in the
     solar equatorial plane, Z points along
     the Sun's spin axis, positive above the equatorial plane, and Y
     completes the right handed set.

  Parameters
  ==========

    Sampling parameter name             : time
    Sampling parameter resolution       : 96.0 seconds
    Minimum sampling parameter          : n/a
    Maximum sampling parameter          : n/a
    Sampling parameter interval         : 48.0 seconds
    Minimum available sampling interval : 48.0 seconds
    Data set parameter name             : position vector
    Noise level                         : n/a
    Data set parameter unit             : AU or degrees


  Coordinates
  ===========

    MEAN INERTIAL HG 1950
    ---------------------
     COORDINATE_SYSTEM_CENTER_NAME = SUN
     COORDINATE_SYSTEM_REF_EPOCH   = UNK /* 09-23-1950 */

      The Heliographic coordinate system is defined in the reference
      epoch of 1950. The unit vectors which define the coordinate
      system are as follows: X points away from the Sun towards the
      ascending node, in the solar equatorial plane, Z points along
      the Sun's spin axis, positive above the equatorial plane,
      and Y completes the right handed set.

      Position is given in terms of the following:

      RANGE (R)      - The range or R component of the spherical
                       Heliographic coordinate system is the distance
                       from the Sun's position at the reference epoch
                       to the spacecraft measured in AU.
      LATITUDE (LAT) - The latitude component of the spherical
                       Heliographic coordinate system is the angle
                       between the solar equatorial plane of the
                       reference epoch measured in the plane that
                       contains the solar spin axis of that epoch.
      LONGITUDE (LONG) - The longitude component of the spherical
                       Heliographic coordinate system is zero in the
                       direction of the ascending node at the
                       reference epoch (X direction) and increases
                       for a body orbiting the Sun as the Earth does.

      X              - The X component of the Heliographic coordinate
                       system points away from the Sun, towards the
                       ascending node, and lies in the solar equatorial
                       plane.
      Y              - The Y vector of the Heliographic coordinate
                       system is formed by the righthanded cross
                       product of the X and Z unit vectors. It lies in
                       the solar equatorial plane and it points away
                       from the Sun, but does not extend in the
                       direction of any particular body.
      Z              - The Z component of the Heliographic coordinate
                       system is parallel to the Sun's spin axis,
                       taken as positive above the equatorial plane of
                       the Sun.

Confidence Level Overview
  =========================
     This dataset was provided by the Voyager Magnetometer team. There
     is a significant problem with loss of precision in the spacecraft
     position. This is not an artifact of the Mag teams processing or
     handling of the data but in the precision of the Supplimental
     Experimenter Data Records (SEDR) for Voyager.


  Data Quality and Coverage
  =========================

    Table 1 contains hourly summaries of the percentage of the data
    available, data quality, and contamination codes. Tables 2 and 3
    contain descriptions of the data quality and data contamination
    ID's respectively.


    -------------------------------------------------------------------
    Table 1. Hourly Data Coverage and Quality Summaries
    -------------------------------------------------------------------
    Start Time           Mode            Percent  Qual  Contam  NumGood
    -------------------------------------------------------------------
    1966-01-01T00:00:00  ENCOUNTER     14489.333   -1     -1    119537


    --------------------------------------------------------------------
    Table 2. Data Quality ID Descriptions
    --------------------------------------------------------------------
    ID   Description
    --------------------------------------------------------------------
    -1   no attempt has been made to specify a data quality for this
         time range


    --------------------------------------------------------------------
    Table 3. Data Contamination ID Descriptions
    --------------------------------------------------------------------
    ID   Description
    --------------------------------------------------------------------
    -1   no evaluation of possible contamination has been made