Helios 2 Ephemeris: Daily Heliocentric Trajectory Coordinates

NASA provides daily heliocentric trajectory data for the Helios 2 spacecraft. The data includes positions in Heliographic (HG), Heliographic Inertial (HGI), and Solar Ecliptic (SE) coordinate systems, calculated using the 'Mean of Date' method for the Equinox Epoch. The original trajectory data is sourced from NASA JPL's Horizons system.

Use Cases

• Modeling spacecraft trajectory relative to the sun based on heliocentric coordinate data.
• Analyzing solar wind or heliospheric phenomena using spacecraft position as a reference frame.
• Comparing coordinate transformation methods (e.g., Mean of Date vs. True of Date) for astronomical calculations.
• Validating orbital mechanics simulations using precise ephemeris data from a trusted source.

Strengths

• Data originates from NASA JPL's Horizons system, a primary source for solar system ephemerides.
• Coordinates are provided in three standard heliospheric reference frames (HG, HGI, SE).
• The 'Mean of Date' method for the Equinox Epoch is explicitly documented as the calculation basis.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for large-scale analysis.
• The description notes more precise and planet-centered coordinates exist in other directories, suggesting this may be a derived or simplified product.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

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

Time Range

Daily data; specific date range is not provided in the description.

Freshness

Last updated 2026-03-13 07:29:54.525949; freshness should be verified.

Geography

Heliocentric (sun-centered) coordinate system; no specific planetary geography.