2025-08-01  Orekit 13.1 released

The Orekit team is pleased to announce the release of Orekit version 13.1.

This minor version fixes several issues, improved performances and added a few features. It depends on Hipparchus 4.0.1.

For complete release notes please see Orekit – Orekit Changes.

• Improve performance and accuracy of getJd.
• Take into account mass in dependsOnPositionOnly.
• Fixed regression on TLE date parsing.
• Fixed failing tests on Windows.
• Add model parameters Jacobian update from dynamics switches.
• Fixed use of wrong class loader.
• Allow resetting wind-up.
• Improved shiftedBy in (Field)StateCovariance.
• Override getPosition in (Field)ShiftingPVCoordinatesProvider.
• Remove some calls to deprecated methods.
• Revamped release process, using fully automated scripts and continuous integration.
• Fix equals in FieldAbsoluteDate.
• Add durationFrom with TimeStamped in FieldTimeStamped.
• Add Jacobian matrix to Lambert solver.
• Move Lambert solver in dedicated package and wrap it for IOD.
• Add Lambert differential correction.
• Add STM update from dynamics switches.
• Add way not to reset (Field)PropagationStepRecorder.
• Add way to clear matrices harvester in propagator.
• Fix problem in TriggerDate without mass in STM.
• Add method to remove AdditionalDataProvider.
• Made FieldTimeSpanMap consistent with TimeSpanMap.
• Added automatic expunge to TimeSpanMap.
• Add dependsOnTimeOnly in (Field)EventDetector and use it in propagation for performance.
• Add access to mass derivative in ForceModel.
• Enable TriggerDate with 7x7 STM.
• Add (Field)BoundedPVCoordinatesProvider.
• Add linear Keplerian covariance step handler.
• Add thrust model based on spherical coordinates.
• Add FieldTimeStampedGeodeticPoint.
• Add ability to include mass in numerical state transition matrix.
• Add getter for (Field)EnablingPredicate.
• Speed up non-Keplerian acceleration in (Field)Orbit.
• Add STM to Gradient state conversion.
• Add Gradient state utils.
• Add reset state saved in (Field)EventsLogger.
• Restored JB2006 model.
• Add FieldGroundAtNightDetector.
• Add TimeIntervalsManeuverTrigger.
• Add TimeInterval interface and some applications.
• Change argument order of TimeStampedDouble and TimeStampedDoubleAndDerivative for consistency with the rest of Orekit.
• Add TimeStampedGeodeticPoint.
• Add (Field)ExtremumAngularSeparationDetector.
• Added getVelocity method.
• Added Herrick-Gibbs initial orbit determination.
• Fixed OrbitRelativeFrame definition of ambiguous local orbital frames (CCSDS).
• Fixed NaN with Gradient in Keplerian motion with circular orbit computed in Cartesian coordinates.

Maven artifacts are available in Maven Central. The source code and binaries can be retrieved from the releases page on our GitLab instance.

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