Δa from tangential burn

First-order Gauss: Δa ≈ 2 a Δv / v on a circular orbit (and inverse).

SIDUS educational calculator. Category orbital. Tags: delta-v, GNC, maneuver, operations, orbital. Pure SI. Not flight software.

Formula

Δa ≈ 2 a Δv / v

Tangential burn changes semi-major axis

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.
• Spaceflight Dynamics (William E. Wiesel): Relative motion, rendezvous, and phasing context complementary to Vallado/Curtis.

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.