HNBody Version 1.2.1

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Problems and Limitations

This page lists open HNBody bugs and limitations, and any other issues of which users should be aware.

# Open Bugs

These are the outstanding issues of which ordinary HNBody users should be aware. They are considered defects and will be resolved in a future release.

- The Symplectic integrator may occasionally fail for systems containing bodies on extremely hyperbolic orbits. The usual symptom is output containing all NaN (not-a-number) values.

# Current Limitations

These are known feature limitations or usage restrictions applicable to the latest official release. They may (or may not) be relaxed or removed in a future release, as noted.

- The ZWP option is currently non-functional and undergoing revision. This capability will be re-enabled in release version 1.3.
- Conversion from Cartesian coordinates to orbital elements can lose phase precision (due to round-off) for nearly-circular orbits. This does not affect simulated particle dynamics; however, output phase-related quantities such as the mean anomaly and argument of periapse may be inaccurate in certain cases.