Native astrodynamics in Rust

pykep-rust is an independent native Rust port of the numerical C++ library in pykep version 3 (kep3). The reusable pykep-core crate contains the astrodynamics implementation without a C or C++ runtime dependency. The optional pykep-rust Python distribution exposes the same implementation through PyO3.

This book connects the narrative material for both interfaces:

• examples and quick starts provide runnable Rust and Python entry points;
• numerical conventions define units, epochs, frames, array layouts, tolerances, and error behavior;
• the dynamics, ephemeris, propagation, and low-thrust guides explain algorithm-specific contracts;
• validation and stabilization evidence record parity, independent checks, coverage, performance, and release limitations.

Exact Rust types, methods, and compiled examples are in the generated pykep-core API reference. Python users should start with the Python API contract and migration matrix.

This project is not an official ESA release. Its pinned upstream source and MPL-2.0 adaptation policy are recorded in the GitHub repository.