**NSSDCA ID:** PSFP-00587

**Availability:** Archived at NSSDC, accessible from elsewhere

**Time span:** 1989-08-22 to 1989-08-29

This description was generated automatically using input from the Planetary Data System.

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.

These data are available on-line from the Planetary Data System (PDS) at:

https://pds-ppi.igpp.ucla.edu/data/VG2-N-POS-5-SUMM-HGCOORDS-48SEC-V1.0/

- VG2-N-POS-5-SUMM-HGCOORDS-48SEC-V1.0

- Planetary Science: Fields and Particles

Questions and comments about this data collection can be directed to: Dr. Edwin V. Bell, II

Name | Role | Original Affiliation | |
---|---|---|---|

Dr. Ronald P. Lepping | General Contact | NASA Goddard Space Flight Center | ronald.p.lepping@gmail.com |