I am trying to convert between osculating orbital elements and specifically Brouwer-Lydanne mean elements. I have thus far tried using the FiniteDifferentPropagatorConverter to create both a TLEPropagator and KeplerianPropagator based on the osculating elements I have, but neither has produced the Brouwer-Lydanne mean elements. I’ve also attempted to use the OsculatingToMeanElementsConverter, though that also did not produce the desired results.
This reference https://arc.aiaa.org/doi/abs/10.2514/4.867231 provides a first-order mapping algorithm to directly convert from osculating to specifically Brouwer-Lydanne mean elements. Is there anything currently like that in the Orekit library that I am missing?