Typically, Emission Nebulae are composed of hydrogen, which glows in the characteristic red color of the Hα emission line at 656.3 nm. Occasionally present oxygen emits turquoise light at 500.7 nm.
The Sharpless catalog, which I use as a reference for representation, is an important resource for astrophotographers who enjoy photographing emission nebulae. It contains 312 HII regions, mainly located north of declination -27°.
Caldwell 31 – Flaming Star Nebula
Sharpless 229, also known as the Flaming Star Nebula, is a combination of reflection and emission nebula located in the constellation Auriga, approximately 1,500 light-years away from Earth. This nebula reaches its annual culmination at astronomical midnight around mid-December ...
Caldwell 49 – Rosette Nebula
The Rosette Nebula is a large emission nebula located in the constellation Monoceros, approximately 5,219 light-years away from Earth, reaching its annual culmination at astronomical midnight at the end of December ...
Messier 16 – Eagle Nebula
The Eagle Nebula, also known as Messier 16, is an emission nebula located in the constellation Serpens, renowned for its striking "Pillars of Creation," vast columns of interstellar gas and dust where new stars are forming ...
Messier 42 – Orion Nebula
The Orion Nebula is a bright diffuse nebula located in the constellation Orion, approximately 1,344 light-years away from Earth, and reaches its annual culmination at astronomical midnight mid December ...
Messier 43 – De Marian’s Nebula
Messier 43, located in the Orion constellation, is approximately 1,300 light-years away and reaches its annual culmination at astronomical midnight around mid-December ...
Sharpless 86
Sharpless 86 is a bright emission nebula in the constellation Cepheus, located approximately 2,100 light-years away from Earth ...
Sharpless 131 – Elephant’s Trunk Nebula
IC 1396A, also known as the Elephant's Trunk Nebula, is a dark globule and star-forming region located in the constellation Cepheus, approximately 2,400 light-years away from Earth, reaching its annual culmination at astronomical midnight mid August. More likely Around August 14th ...
Sharpless 142 – Wizard Nebula
The Wizard Nebula (NGC 7380) is an emission nebula located in the constellation Cepheus, approximately 5545 light-years from Earth. It reaches its annual culmination at astronomical midnight in early September. September the 2nd to be more concrete ...
Sharpless 236 – Tadpole Nebula
Sharpless 236, also known as IC 410 or the Tadpole Nebula, is an emission nebula located in the constellation Auriga, approximately 2185 light-years away from Earth, reaching its annual culmination at astronomical midnight mid. December ...
Sharpless 252 – Monkey Head Nebula
The Monkey Head Nebula is an emission nebula located in the constellation Orion, approximately 3,200 light-years away from Earth, reaching its annual culmination at astronomical midnight at the end of December ...
Sharpless 277 – Flame Nebula
The Flame Nebula is a bright emission nebula located in the constellation Orion, approximately 900-1,500 light-years away from Earth. It reaches its annual culmination at astronomical midnight mid December ...
IC 5070 – Pelican Nebula
The Pelican Nebula, located in the constellation Cygnus, is approximately 1,800 light-years away from Earth and reaches its annual culmination at astronomical midnight early August. Specifically around August 4th ...
LBN 728
LBN 728 is a nebula located in the constellation Ursa Major. It reaches its annual culmination at astronomical midnight and is best observed in mid-January ...
LBN 729
LBN 729 is an emission nebula located in the constellation Ursa Major. It reaches its annual culmination at astronomical midnight and is best observed in Mid-January ...
