def _get_ra_dec_name(id_arr, ra_arr, dec_arr):
    """Get the object name based on ID and (RA, Dec)."""
    return [
        "{:s}_{:s}_{:s}_{:s}".format(
            str(i), "{:8.4f}".format(ra).strip(), "{:8.4f}".format(dec).strip()
            ) for (i, ra, dec) in zip(id_arr, ra_arr, dec_arr)]