2.7.1 https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions spase://NASA/NumericalData/Voyager2/Ephemeris/Neptune/PT12S NASA NumericalData Voyager 2 Neptune Ephemeris in Neptune West Longitude, NLS, Coordinates, Version 1.0, 12 s Summary Data 2025-12-04T13:32:33Z 2020-07-07T21:15:55Z Only known prior ReleaseDate of the metadata 2025-12-04T13:32:33Z Added MetadataRightsList. Added ResourceType and NamingAuthority. Updated to 2.7.1. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. ZCB * Data Set Overview * ================= This Data Set consists of Voyager 2 Neptune Encounter Ephemeris Data relative to the Planet in Minus NLS Coordinates. The NLS or Neptune West Longitude System Coordinate System is a Planetocentric System fixed to Neptune, which is rotating with a 16.11 h Period. * Cartesian Coordinates * ===================== * NLS Cartesian Coordinates * ========================= - X lies in the Equatorial Plane of Neptune, positive away from the Planet, and through the Prime Meridian at the Reference Epoch - Y completes the left-handed Set, Y = Z ⨯ X - Z points along the Spin Axis of Neptune The Prime Meridian of this System is defined such that at 1989-08-25T03:56:00.000 the Voyager 2 Spacecraft was at 167.7° West Longitude. For the PDS Archive Data Set, the original Data Archive has been converted to an East Longitude (right-handed) Coordinate System Minus NLS (-NLS). This is achieved by reversing the Direction of the Y Axis, or in Spherical Coordinates, by subtracting the NLS Longitude from 360°. The Data are provided in Units of Neptunian Radii, which was taken to be equal to 24,765 km by the Voyager Project. Angles are given in Degrees. Both Cartesian and Spherical Coordinates are provided. +-----------------------------------+ | Parameter Characteristics | Value | ------------------------------------- | Processing Level ID | 4 | | Software Flag | Y | | Processing Start Time | UNK | | Processing Stop Time | UNK | +-----------------------------------+ * Parameters * ========== * Data Set Parameter POSITION VECTOR * ================================== A Position Vector is a Triad that describes the Location of a Point in three dimensional Space relative to some Origin. +-----------------------------------------------------------------------+ | Parameter Characteristics | Value | ------------------------------------------------------------------------- | Data Set Parameter Name | POSITION VECTOR | | Data Set Parameter Unit | NEPTUNE RADII (24,765 KM) OR DEGREES | | Sampling Parameter Name | TIME | | Sampling Parameter Unit | SECONDS | | Sampling Parameter Resolution | 12 | | Sampling Parameter Interval | 12 | | Minimum Available Sampling Int | 12 | +-----------------------------------------------------------------------+ * Source Instrument Parameters * ============================ N/A * Measurement Information * ======================= N/A * Processing * ========== * Processing History * ================== +-------------------------------------------------------------------+ | Parameter Characteristics | Value | --------------------------------------------------------------------- | Source Data Set ID | N/A | | Software | UNK | | Product Data Set ID | VG2-N-POS-5-SUMM-NLSCOORDS-12SEC-V1.0 | +-------------------------------------------------------------------+ spase://SMWG/Person/Todd.A.King MetadataContact spase://SMWG/Person/Lee.Frost.Bargatze MetadataContact VG2-N-POS-5-SUMM-NLSCOORDS-12SEC-V1.0 https://pds-ppi.igpp.ucla.edu/data/VG2-N-POS-5-SUMM-NLSCOORDS-12SEC-V1.0/AAREADME.TXT The Document describing the Contents of the Collection. En spase://VMO/NumericalData/Voyager2/Ephemeris/Neptune/PT12S spase://VSPO/NumericalData/Voyager2/Ephemeris/Neptune/PT12S spase://SMWG/Repository/PDS/PPI Online Open PDS/PPI https://pds-ppi.igpp.ucla.edu/search/view/?f=yes&id=pds://PPI/VG2-N-POS-5-SUMM-NLSCOORDS-12SEC-V1.0 VG2-N-POS-5-SUMM-NLSCOORDS-12SEC-V1.0 This Collection is archived with the NASA Planetary Data System. En Text.ASCII Please acknowledge the NASA Planetary Plasma Interactions (PPI) Node of the Planetary Data System (PDS) and the P.I. for the Data. spase://SMWG/Instrument/Voyager2/Ephemeris Ephemeris 1989-08-24T18:00:00.00 1989-08-26T08:19:48.00 PT12S Neptune