Is this flight software?

No. SIDUS models are educational reimplementations. Cross-check before any flight decision.

Ballistic coefficient / drag Δv

β = m/(Cd A) and order-of-magnitude Δv per revolution from exponential atmosphere drag.

SIDUS educational calculator. Category utilities. Tags: aero, LEO, operations, satellite, utilities. Pure SI. Not flight software.

β = m/(C_d A) · Δv/rev ∼ πρ a v / β

Ballistic coefficient and drag order

Fundamentals of Astrodynamics and Applications (David A. Vallado): Standard reference for two-body, Lambert, maneuvers, and J2. Equations implemented independently in SIDUS.
NASA Glenn Research Center: Beginner’s Guide to Aeronautics (NASA GRC): Ideal rocket equation, specific impulse, thrust equation, dynamic pressure education pages.
International Standard Atmosphere (ISO 2533 / ICAO) (ISO / ICAO): ISA troposphere model used for educational density, temperature, and speed of sound.

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