def to_pixel(self, wcs, mode='all'):
        """
        Convert the aperture to a `RectangularAnnulus` object defined in
        pixel coordinates.

        Parameters
        ----------
        wcs : `~astropy.wcs.WCS`
            The world coordinate system (WCS) transformation to use.

        mode : {'all', 'wcs'}, optional
            Whether to do the transformation including distortions
            (``'all'``; default) or only including only the core WCS
            transformation (``'wcs'``).

        Returns
        -------
        aperture : `RectangularAnnulus` object
            A `RectangularAnnulus` object.
        """

        pixel_params = self._to_pixel_params(wcs, mode=mode)
        return RectangularAnnulus(**pixel_params)
Convert the aperture to a `RectangularAnnulus` object defined in
        pixel coordinates.

        Parameters
        ----------
        wcs : `~astropy.wcs.WCS`
            The world coordinate system (WCS) transformation to use.

        mode : {'all', 'wcs'}, optional
            Whether to do the transformation including distortions
            (``'all'``; default) or only including only the core WCS
            transformation (``'wcs'``).

        Returns
        -------
        aperture : `RectangularAnnulus` object
            A `RectangularAnnulus` object.