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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def to_skycoord(self, unit=None):
 """Convert this distance to an AstroPy ``SkyCoord`` object."""

        from astropy.coordinates import SkyCoord
        from astropy.units import au
        x, y, z = self.position.au
        return SkyCoord(representation='cartesian', x=x, y=y, z=z, unit=au)