Best Accuracy-Provider Input for DSST Propagator

OK.
Then the best you can do is just use the TLEPropagator itself, there is no need to convert
it to something else.

So you get the propagator and the ECEF frame as follows:

TLEPropagator propagator = TLEPropagator.selectExtrapolator(tle);
Frame itrf = FramesFactory.getITRF(IERSConventions.IERS_2010, true);

And for any date of your choosing you can call

TimeStampedPVCoordinates pvt = propagator.propagate(date).getPVCoordinates(itrf);

As explained in another thread, if you want to get the position-velocity over a full range, you can use a step handler to pick them up on one go.

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