ISEE 3 Spacecraft Heliocentric Trajectory Data in Multiple Coordinate Systems

Heliocentric trajectory data for the ISEE 3 spacecraft in Heliographic (HG), Heliographic Inertial (HGI), and Solar Ecliptic (SE) coordinates. The data is produced by NASA using the 'Mean of Date' method for the Equinox Epoch and is derived from original trajectory data sourced from NASA JPL's Horizons system. The dataset was last updated on March 13, 2026.

Use Cases

• Modeling spacecraft orbital dynamics based on heliocentric trajectory data.
• Analyzing solar wind interactions based on the spacecraft's position in heliographic coordinates.
• Comparing coordinate system transformations based on the provided HG, HGI, and SE data.
• Validating ephemeris calculations using the 'Mean of Date' Equinox Epoch method described.

Strengths

• Data originates from the authoritative NASA JPL Horizons system.
• Coordinates are calculated using the specific 'Mean of Date' method for the Equinox Epoch.
• Trajectories are provided in three distinct coordinate systems (HG, HGI, SE).

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and dataset size are unknown, which may limit suitability assessment.
• More precise and planet-centered coordinates are noted to be available in other directories.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Calculated from original trajectory data sourced from NASA JPL's Horizons system.

Time Range

Daily data; specific temporal coverage is not detailed.

Freshness

Last updated 2026-03-13 06:14:04.580463; freshness should be verified.

Geography

Heliocentric (solar system) scale.