Changes

{{Night Sky

{{Night Sky

| image          =

| image          =

| designation    =[[Messier catalogue|Messier 8]]

| designation    =[[Messier catalogue|Messier 8]]<br/>[[NGC]] 6523

[[NGC]] 6523

| rightascension  =18^h 03^m 37^s<ref name=messier-objects>[http://www.messier-objects.com/messier-8-lagoon-nebula/ M8] from messier-objects.com</ref>

| rightascension  =18^h 03^m 37^s  

| declination    =-24° 23′ 12″<ref name=messier-objects/>

| declination    =-24° 23′ 12″

| distance        =4,100 ly<ref name=messier-objects/>

| distance        =4,100 ly  

| constellation  =[[Sagittarius]]

| constellation  =[[Sagittarius]]

| type            =[[Emission nebula]]

| type            =[[Emission nebula]]

| dimensions      = 90' x 40'

| dimensions      =90' x 40'<ref name=messier-objects/>

| magnitude      =6

| magnitude      =Apparent Mag: +6.0<ref name=messier-objects/><br/>Absolute Mag: -4.5<ref>From definition of absolute magnitude, using apparent magnitude and distance given here.</ref>

| redshift        =

| redshift        =0.000013<ref name=simbad>[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=lagoon+nebula&submit=submit+id M8] from simbad.u-strasbg.fr</ref>

| radvelocity    =

| radvelocity    =3.8 km/s<ref name=simbad/>

| propmotion      =

| propmotion      =

| parallax        =

| parallax        =

}}

}}

The '''Lagoon nebula''' ([[Messier catalogue|M8]], NGC 6523) is an [[emission nebula]] in the [[constellation]] of [[Sagittarius]].<ref name=seds>[http://www.messier.seds.org/m/m008.html M8] from messier.seds.org</ref> It contains an [[open cluster]] of [[star]]s that has a magnitude of 4.6.<ref name=messier-objects>[http://www.messier-objects.com/messier-8-lagoon-nebula/ M8] from constellation-guide.com</ref> It is only just visible to the naked eye under good observation conditions and one of the larger nebulae in Sagittarius.<ref name=earthsky>[http://earthsky.org/clusters-nebulae-galaxies/the-lagoon-nebula-messier-8 The Lagoon nebula] from earthsky.org</ref>

The '''Lagoon nebula''' ([[Messier catalogue|M8]], NGC 6523) is an [[emission nebula]] in the [[constellation]] of [[Sagittarius]].<ref name=seds>[http://www.messier.seds.org/m/m008.html M8] from messier.seds.org</ref> It contains an [[open cluster]] of [[star]]s that has a magnitude of 4.6.<ref name=messier-objects/> It is only just visible to the naked eye under good observation conditions and one of the larger nebulae in Sagittarius.<ref name=earthsky>[http://earthsky.org/clusters-nebulae-galaxies/the-lagoon-nebula-messier-8 The Lagoon nebula] from earthsky.org</ref>

==History==

==History==