J2/J3 frozen eccentricity
First-order frozen eccentricity from J2, J3, SMA and inclination.
SIDUS educational calculator. Category orbital. Tags: mission-design, orbital. Pure SI. Not flight software.
Formula
e ≈ −(J3/2J2)(R/a) sin i
J2/J3 frozen eccentricity
Primary sources
- Fundamentals of Astrodynamics and Applications (David A. Vallado): Standard reference for two-body, Lambert, maneuvers, and J2. Equations implemented independently in SIDUS.
- Orbital Mechanics for Engineering Students (Howard D. Curtis): Textbook derivations for Hohmann, vis-viva, rocket equation, elements.
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.