code: def cone_search_skycoord(self, skycoord, radius):
          
          if self.frame is None:
              raise NoFrameError("cone_search_skycoord")
          skycoord = skycoord.transform_to(self.frame)
          representation = skycoord.represent_as(UnitSphericalRepresentation)
          lon, lat = representation.lon, representation.lat
          return self.cone_search_lonlat(lon, lat, radius)
docs: Find all the HEALPix pixels within a given radius of a celestial position.
  
          Note that this returns all pixels that overlap, including partially,
          with the search cone. This function can only be used for a single
          celestial position at a time, since different calls to the function may
          result in a different number of matches.
  
          This method requires that a celestial frame was specified when
          initializing HEALPix.  If you don't know or need the celestial frame,
          you can instead use :meth:`~astropy_healpix.HEALPix.cone_search_lonlat`.
  
          Parameters
          ----------
          skycoord : :class:`~astropy.coordinates.SkyCoord`
              The celestial coordinates to use for the cone search
          radius : :class:`~astropy.units.Quantity`
              The search radius
  
          Returns
          -------
          healpix_index : `~numpy.ndarray`
              1-D array with all the matching HEALPix pixel indices.