STEREO-A Ephemeris: Daily Heliocentric Trajectory Coordinates

Heliocentric trajectory data for the STEREO-A spacecraft, calculated using the 'Mean of Date' method for the Equinox Epoch. The dataset provides daily coordinates in Heliographic, Heliographic Inertial, and Solar Ecliptic coordinate systems, sourced from NASA's JPL Horizons system. Data is maintained by the National Aeronautics and Space Administration and was last updated in March 2026.

Use Cases

• Modeling solar wind propagation based on spacecraft position in heliographic coordinates.
• Analyzing long-term orbital drift based on daily time-series trajectory data.
• Calibrating space weather models based on precise heliocentric location data.
• Studying coordinate system transformations between HG, HGI, and SE frames.

Strengths

• Data originates from NASA's authoritative JPL Horizons system.
• Coordinates are calculated using a defined 'Mean of Date' method for the Equinox Epoch.
• Provides data in three distinct coordinate systems: Heliographic, Heliographic Inertial, and Solar Ecliptic.

Limitations

• 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 NASA JPL Horizons.

Time Range

Daily data; specific temporal coverage is not stated.

Freshness

Last updated 2026-03-13 04:44:30.122779; freshness should be verified.

Geography

Heliocentric (solar system) coordinates; no terrestrial geography.