[Orekit Users] Propagating with Threads (Error)

[<javier.montemayor.mancias@emi.fraunhofer.de>]

Hi,

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:
https://github.com/jmontemayorm/Satellite_Orbit_Analyzer

Best regards,
Javier

P.S.: Does anybody know if the altitude argument for GeodeticPoint is in
meters or km?