| redshift =-0.000064<ref name=simbad>[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=m57&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id M57] from simbad.u-strasbg.fr</ref> | | redshift =-0.000064<ref name=simbad>[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=m57&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id M57] from simbad.u-strasbg.fr</ref> |