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NGC 6164-5 work in progress
The central star in this complex is an O class of ~40 solar masses. It is nearing its end of life, and has been subject to mass loss events (something like Eta Carinae?). It is thought to be destined to end as a supernova
The dumbell-like inner shell has the two designations: NGC 6164 and 6165.
The very faint outer shell - mainly OIII - is only rarely imaged, as it is extremely tenuous.
This image was shot with ASA10N at f/6.8; Moravian G3-16200; DDM85 unguided. 2hr40min OIII, 2hr30min Ha, 1hrRGB all binned X2, as I was prepared to sacrifice resolution for photons. The image structure is essentially Ha to red, OIII to green and blue, RGB star colours.
Having processed it, it is clear I could use another 4hr OIII to advantage, so it is a work in progess
FOV is approx 40' square,
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