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2 votes

Is it possible to create an analytical ephemeris from raw position and velocity of a Body?

Not "analytical" but you can compute your own cubic splines to an arbitrary accuracy. ...
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8 votes

Is it possible to create an analytical ephemeris from raw position and velocity of a Body?

It's possible, because that's partly how VSOP was made, but the amount of effort involved is immense. What you are describing is at the very least a doctoral thesis, if not several of them. Why not ...
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