Overview

Orekit is a low-level space flight dynamics library written in Java, maintained by CS GROUP, open source since 2008.

Basic Information

• License: Apache License 2.0
• Source: ESA / CS GROUP
• Official Docs: https://www.orekit.org/
• Language: Java 8+
• Math dependency: Hipparchus 4.0.3

Key Features

• Orbit propagation (analytical, semi-analytical, numerical, TLE)
• Orbit determination (least squares, Kalman filtering)
• Attitude definition and coordinate reference systems
• Low-thrust trajectory design and atmospheric density modeling
• Eclipse and visibility event detection

Use Cases

• Orbit propagation and orbit determination
• Low-thrust trajectory design and atmospheric density modeling
• Coordinate transformations and event detection

Official Resources

• Website: https://www.orekit.org/
• GitLab: https://gitlab.orekit.org/orekit/orekit
• GitHub mirror: https://github.com/CS-SI/Orekit
• Python wrappers: JCC / JPype