Ephemeris in orekit

Hello!! I’m trying to create RA, DEC from KeplerOrbit. I’ve tried to use

generator = propagator.getEphemerisGenerator()
ephemeris = generator.getGeneratedEphemeris()

But it seems like ephemeris here are Spacecraft states (PV coordinates). Is it possible to create a sequence of ‘observations’ (ra, dec) using IOD results (to find a solution to the inverse problem) for certain moments of time in the certain frame??

Maybe have a look at the measurements generation feature?