Changes

| declination    =-16° 10′ 36″<ref name=messier-objects/>

| declination    =-16° 10′ 36″<ref name=messier-objects/>

| distance        =5,000-6,000 ly<ref name=messier-objects/>

| distance        =5,000-6,000 ly<ref name=messier-objects/>

| constellation  =[[Sagittarius]]

| constellation  =Sagittarius

| type            =[[Emission nebula]]

| type            =Emission nebula

| dimensions      = 20x15'<ref>[http://www.constellation-guide.com/omega-nebula-messier-17/ Omega nebula - M17] from constellation-guide.com</ref>

| dimensions      = 20x15'<ref>[http://www.constellation-guide.com/omega-nebula-messier-17/ Omega nebula - M17] from constellation-guide.com</ref>

| magnitude      =Apparent Mag: +6.0<ref name=messier-objects/><br/>Absolute Mag: -5.1<ref>From definition of absolute magnitude, using apparent magnitude given here and midway distance value, 5,500 ly.</ref>

| magnitude      =Apparent Mag: +6.0<ref name=messier-objects/><br/>Absolute Mag: -5.1<ref>From definition of absolute magnitude, using apparent magnitude given here and midway distance value, 5,500 ly.</ref>