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AW: [Orekit Users] Propagating with Threads (Error)

Hi Evan,


Removing the static keyword fixed the issues, so it appears to be thread safe, should I still submit the bug?


Will submit bug for unit documentation and thanks for the additional advice!


Best regards,



Von: orekit-users-request@orekit.org [mailto:orekit-users-request@orekit.org] Im Auftrag von Ward, Evan
Gesendet: Freitag, 15. Juni 2018 16:21
An: orekit-users@orekit.org
Betreff: Re: [Orekit Users] Propagating with Threads (Error)


Hi Javier,


Don't share a Propagator between threads. I.e. make Satellite.propagator not static. Could you submit a bug to document that propagators are not thread-safe? It is currently documented for NumericalPropagator, but not TLEPropagator or Propagator. [1]


Altitude is in meters. Orekit uses m, s, rad, kg unless otherwise documented. Could you create a bug to document units there?


Patches are also welcome with the bugs if you would like to fix the issues.


Some other unsolicited advice. :) Use TLEPropagator.selectExtrapolator() instead of new SGP4(). [2] Use an ExecutorService [3] instead of Thread.

Best Regards,




On Fri, 2018-06-15 at 15:22 +0200, javier.montemayor.mancias@emi.fraunhofer.de wrote:

I'm trying to run several propagations in parallel using threads. However, I
get either a NullPointerException or an Orekit Exception "interval does not
bracket a root: f(0) = 0,01, f(60) = 0,042". I am using elevation detectors,
when I do not use them, the error does not happen.
Any ideas on how to make this right?
Here's the GitHub for the project:
Best regards,
P.S.: Does anybody know if the altitude argument for GeodeticPoint is in
meters or km?