The Cone (NGC 2264) is the main one - it is the brightest part of a large emission nebula and it is the only nebula whose precise distance is known. The distances to the other nebulae on this list are very uncertain. IC 446 and NGC 2245 appear to be a few thousand light years behind the Cone nebula, all others could be associated with it.
The distance to the Cone nebula is well known because it has a cluster at its center. The distance at which it is ... is about 2,200 light years, which means that the nebula is in the Orion arm and approximately 900 light years further from us than the Orion nebula.
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Photo: Juan Lozano, AstroBin
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