10h Red + 7h Green + 10h Blue under a very dark sky in Namibia.
At first I thought that NGC 5367 was a dark nebula like many others, then it came out that 'cometary globules' are a class of dark nebulae:
"Cometary globules are interstellar clouds with comet-like morphology, consisting of compact, dusty, and opaque heads and long, faintly luminous tails. Unlike most dark clouds, CG's are isolated neutral globules surrounded by a hot ionized medium.
Most CG's are located in the Gum nebula, a large region of ionized gas with approximate distance and size of 450 and 300 pc, respectively.
Its prominent sources of energy are l Vel CNC 8+ 09 I), 1;, Pup (04), and the Vela supernova remnant.
Two scenarios were suggested to explain the spatial distribution and the comet-like appearance:
- Brand (1981) argues that CG's were initially nearly spherical clouds which were shocked by the blast wave from a supernova explosion.
- Reipurth (1983) suggests that the CG's are shaped by UV radiation impinging on a neutral cloud in a clumpy interstellar medium. "
(source:
https://www.eso.org/sci/publications/messenger/archive/no.57-sep89/messenger-no57-8-9.pdf)
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