Hi Orekit people,
Is there a simple way to integrate the J2 perturbation effect within the KeplerianPropagator ?
I am currently trying to use Orekit in replacement of an old propagation library that can analytically manage any type of orbit (LEO, GEO, …). For LEO orbits the results of the two software are quickly diverging as we get far from the keplerian parameters definition date. I believe the J2 effect is the origin of these discrepancies as it is not taken into account by the Orekit KeplerianPropagator.
I wondered whether there was an existing extension of the KeplerianPropagator that could update the input parameters (right ascension, periapsis argument and true anomaly) according to a given planet J2 value.
The J2DifferentialEffect class not seem to fit this purpose and I could not find any other Orekit propagator that directly fits my need (Eckstein-Hechler seems to be too restrictive).