Cassini Ephemeris: Heliocentric Trajectory Coordinates, Daily Data

Heliocentric trajectory data for the Cassini spacecraft in Heliographic (HG), Heliographic Inertial (HGI), and Solar Ecliptic (SE) coordinate systems. The data is produced daily by NASA using the 'Mean of Date' method for determining the Equinox Epoch. Original trajectory data are sourced from JPL's Horizons system.

Use Cases

• Modeling spacecraft heliocentric trajectories based on HG, HGI, and SE coordinate data
• Analyzing solar system dynamics using the 'Mean of Date' Equinox Epoch method
• Comparing spacecraft ephemeris with planetary orbital data as a proxy
• Studying the drift of the First Point of Aries (FPA) direction over time

Strengths

• Data originates from authoritative sources: NASA and JPL's Horizons system
• Coordinates are calculated using a defined 'Mean of Date' Equinox Epoch method
• File formats include BIN, TEXT, and HTML for different access needs

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download
• Column-level documentation is absent; field semantics must be inferred after download
• Row count is unknown, which may limit suitability assessment

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Calculated from original trajectory data taken from JPL's Horizons system.

Freshness

Last updated 2026-03-13 11:19:30.829433; freshness should be verified