2025-09-14 Orekit 13.1.1 released
The Orekit team is pleased to announce the release of Orekit version 13.1.1.

This patch version fixes several issues.
It depends on Hipparchus 4.0.2.
For complete release notes please see
Orekit – Orekit Changes.
- Fixed Ionosphere Piercing Point computation in Global Ionosphere Model.
- Added pointAtAltitude in OneAxisEllipsoid.
- Fix numerical error in FieldEclipseDetector.
- Fixed time interpolation in Global Ionospheric Model (ionex files).
- Improved performance of STM propagation with many forces.
- Fixed NullPointerException in Sinex bias handling.
- Fixed observables ordering error when writing Rinex observation header.
- Fixed inconsistency between Abstract{Field}ODEStateInterpolator and {Field}DetectorBasedEventState for event time handling.
- Fixed duplicated 13.1 version in faq.md.
- Link to “changes” web page on technical site not working on develop version.
- Pass event detectors from attitude provider in (Field)DSSTPropagator.
- Fixed limitation of ECOM2 model to default data context.
- Fixed dead link to in “Development Guidelines” site page.
- Fix exception message when parsing a CDM with an invalid date.
- Fix exception messages with FieldElements.
Maven artifacts are available in Maven Central. The source code and binaries
can be retrieved from the releases page
on our GitLab instance.
News summary