Changes

{{Night Sky

{{Night Sky

| image          =

| image          =

| designation    =[[Messier catalogue|Messier 57]]

| designation    =[[Messier catalogue|Messier 57]]<br/>[[NGC]] 6720

[[NGC]] 6720

| rightascension  =18^h 53^m 35.079^s<ref name=messier-objects>[http://www.messier-objects.com/messier-57-ring-nebula/ Messier 57] from messier-objects.com</ref>

| rightascension  =18^h 53^m 35.079^s  

| declination    =-33° 01′ 45.03″<ref name=messier-objects/>

| declination    =-33° 01′ 45.03″

| distance        =2,300 ly<ref name=messier-objects/>

| distance        =2,300 ly  

| constellation  =[[Lyra]]

| constellation  =[[Lyra]]

| type            =[[Planetary nebula]]

| type            =[[Planetary nebula]]

| dimensions      = 1'

| dimensions      = 230x230"<ref name=messier-objects/>

| magnitude      =8.8

| magnitude      =Apparent Mag: +8.8<ref name=messier-objects/><br/>Absolute Mag: -0.2<ref name=messier-objects/>

| redshift        =

| 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>

| radvelocity    =-21 km/s

| radvelocity    =-21 km/s<ref name=simbad/>

| propmotion      =

| propmotion      =

| parallax        =

| parallax        =1.42±0.55 mas<ref name=simbad/>

}}

}}

The '''Ring nebula''' (M57, NGC 6720) is a [[planetary nebula]] in the [[constellation]] of [[Lyra]].<ref name=seds>[http://www.messier.seds.org/m/m057.html M57] from messier.ses.org</ref> It is one of the four planetary nebulae in the [[Messier catalogue]].<ref name=messier-objects>[http://www.messier-objects.com/messier-57-ring-nebula/ Messier 57] from messier-objects.com</ref> The nebula is well known for its spectacular colours. The nebula is approaching [[Earth]] at 21 km/s

The '''Ring nebula''' (M57, NGC 6720) is a [[planetary nebula]] in the [[constellation]] of [[Lyra]].<ref name=seds>[http://www.messier.seds.org/m/m057.html M57] from messier.seds.org</ref> It is one of the four planetary nebulae in the [[Messier catalogue]].<ref name=messier-objects/> The nebula is well known for its spectacular colours. The nebula is approaching [[Earth]] at 21 km/s

==History==

==History==