OREKIT (ORbits Extrapolation KIT) is an open-source library designed for space dynamics, orbital mechanics, and space system development. Written in Java, it provides a comprehensive set of tools for developing mission-critical space applications such as satellite trajectory modeling, orbit determination, and space mission analysis.
Key Features:
- Precision Orbit Propagation
- Supports various propagation models: analytical, numerical, and semi-analytical.
- Models perturbations from gravitational forces, atmospheric drag, solar radiation pressure, and third-body influences.
- Frames and Time Scales
- Robust handling of coordinate frames (ECI, ECEF, TEME, etc.).
- Manages multiple time systems (UTC, TAI, TT, etc.), with precise transformations.
- Orbit Determination
- Enables accurate orbit determination using measurements like range, Doppler shift, and angles.
- Implements Kalman filtering and batch least squares methods.
- Attitude and Maneuver Modeling
- Models satellite attitude dynamics, including spin-stabilized and momentum-biased configurations.
- Supports modeling of spacecraft maneuvers and station-keeping.
- Event Detection
- Detects events such as eclipses, altitude crossings, and node passages.
- Facilitates mission planning by identifying critical orbital phases.
- Ephemeris Management
- Can read and write ephemeris files in common formats (e.g., SP3, OEM).
- Integrates with external sources for high-precision orbit data.
- Extensibility and Modularity
- Built with a modular design, allowing customization and extension.
- Compatible with other Java-based projects and integrates with Python through bindings (e.g., using Jython or JNI).
- Standards and Accuracy
- Complies with international space standards (CCSDS, IERS).
- Incorporates IAU-recommended models for Earth rotation, nutation, and precession.
Use Cases:
- Satellite trajectory planning and operations.
- Ground station pass predictions.
- Space situational awareness and conjunction analysis.
- CubeSat and small satellite mission design.
- Spacecraft formation flying simulations.
Community and Support:
- Open-Source under the Apache License 2.0.
- Developed and maintained by a vibrant community, with contributions from industry leaders, space agencies, and academic institutions.
- Strong documentation and example codes facilitate ease of use.
Getting Started:
Maven Repository: Available for easy integration into Java projects.
Website: https://www.orekit.org
