Central bodies

μ, radius, mass and SOI for major Solar System bodies.

SIDUS educational calculator. Category orbital. Tags: orbital, reference. Pure SI. Not flight software.

Formula

μ = GM · r_SOI ≈ a (m/M)^{2/5} · g = μ/R²

Central body constants

Primary sources

• JPL Horizons (NASA / JPL): Solar System ephemerides and body constants.
• IAU / planetary constants practice (IAU): Astronomical constant conventions used alongside JPL body data.
• Fundamentals of Astrodynamics and Applications (David A. Vallado): Standard reference for two-body, Lambert, maneuvers, and J2. Equations implemented independently in SIDUS.

How do AI agents use this tool?

Read /llms.txt or call https://sidus.tools/api/mcp. Open the interactive page for live SI inputs.