|Right ascension||19h 39m 42s|
|Type of object||Dark nebula|
|Distance from Earth||2,000 ly|
The E nebula (Barnard 142, Barnard 143) is a dark nebula in the constellation of Aquila. The nebula can be found not far from the star Altair and is best observed during the summer months. The E nebula is a combination of two nebulae that E. E. Barnard described, which he designated Barnard 142 and Barnard 143 in his catalogue. Barnard 143 has the appearance of a square with one side missing. This with the southern Barnard 142 produces a shape reminiscent of a capital E, giving the nebula its name.
Located 2,000 light years away, the nebula appears around half a degree across, similar to that of the Full moon. This means it is approximately 0.01 ly wide. The nebula is a dark nebula, meaning it is visible because it obscures (blocks) the light of background stars.