docs: def _append_cdata(self, coordinate):
          """
          Append an target location to the ephemeris listing.
          """
          fields = self.fields
          sra = coordinate.ra.to_string(units.hour, sep=':', precision=2, pad=True)
          sdec = coordinate.dec.to_string(units.degree, sep=':', precision=1, alwayssign=True)
          coord = SkyCoord(sra + " " + sdec, unit=(units.hour, units.degree))
          sra = coord.ra.to_string(units.hour, sep=":", precision=2, pad=True)
          sdec = coord.dec.to_string(units.degree, sep=":", precision=1, pad=True, alwayssign=True)
          sdate = str(coordinate.obstime.replicate(format('iso')))
          self.cdata.appendData(self._entry(sdate, fields["DATE_UTC"]['attr']['width'], colsep=self.column_separator))
          self.cdata.appendData(self._entry(sra, fields["RA_J2000"]['attr']['width'], colsep=self.column_separator))
          self.cdata.appendData(self._entry(sdec, fields["DEC_J2000"]["attr"]["width"], colsep=self.column_separator))
          self.cdata.appendData("\n")