Escape velocity

Minimum speed to leave the gravitational well from a given radius.

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

Formula

v_esc = √(2μ/r) v_esc / v_circ = √2

Leave the gravitational well

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.
• JPL Horizons (NASA / JPL): Solar System ephemerides and body constants.

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.