Voyager 2 Heliocentric Trajectory Data in Multiple Coordinate Systems

NASA's HelioWeb provides daily heliocentric trajectory data for the Voyager 2 spacecraft. The data is derived from JPL Horizons ephemeris and is calculated in Heliographic, Heliographic Inertial, and Solar Ecliptic coordinate systems using the 'Mean of Date' method for the Equinox Epoch. The dataset was last updated in March 2026.

Use Cases

• Modeling spacecraft trajectory and position over time based on daily ephemeris data.
• Converting between Heliographic, Heliographic Inertial, and Solar Ecliptic coordinate systems.
• Analyzing the drift of the First Point of Aries (FPA) using the 'Mean of Date' Equinox Epoch method.
• Comparing spacecraft ephemeris with planetary orbital data as a proxy on a heliospheric scale.

Strengths

• Data originates from the authoritative JPL Horizons system, a standard for solar system ephemerides.
• Provides coordinates in three distinct systems (HG, HGI, SE) for positional analysis.
• Uses the 'Mean of Date' method for the Equinox Epoch, which smooths tiny irregularities in FPA drift.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• The description notes that more precise and planet-centered coordinates are available in other directories.

Provenance

Source

National Aeronautics and Space Administration (NASA) via the HelioWeb platform.

Collection Method

Original trajectory data calculated from JPL Horizons ephemeris, then processed into HG, HGI, and SE coordinates.

Time Range

Daily data; specific temporal coverage is not stated.

Freshness

Last updated 2026-03-13 14:34:34.697712; freshness should be verified.

Geography

Heliocentric (solar system) coverage.