m27 (astroeyes) - AstroBin

Celestial hemisphere: Northern · Constellation: Vulpecula (Vul) · Contains: Dumbbell nebula · M 27 · NGC 6853

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m27

And another from 2006, again using the old MX5C camera.

This image of M27 taken over a couple of nights at some unearthly hour but needed to image something bright as I had to limit exposures to 30 seconds to reduce wind vibration as much as possible. Took over 60 x 30 second exposures and managed to use about 50 of them. So a total of about 25 mins exposure. Still signs of enlarged stars which I have tried to reduce with maximum entropy deconvolution - with limited success, mainly because I don't know fully how to use deconvolution yet.

M27 is big, 8x6 arc min for the main nebula; it's very bright at magnitude 7.4 and it has a very high surface brightness.

It's distance, like most planetaries is not well known, with estimates ranging from 500 to 3500 light years. It's intrinsic luminosity is about 100 x that of our sun and its age is thought to be about 3-4000 years.

Captured in Astroart, no darks and no flats. Subtracted the bias and colour converted using AA's colour synthesis routine. Split RGB and L frames. Colour balanced the green and blue to the red background. All other processing, log stretching, noise reduction and deconvolution done on the L frame, before the image was recombined in Astroart. Some final colour smoothing done in NEAT image, colour saturation, hue and brightness adjusted in Micrografix.

A couple of questions. Why are planetaries different shapes (why aren't they all round like the Ring neb) and which is the white dwarf in the Dumbbell, does anyone know, is it the obvious one in the centre of the nebula?

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Status	Basic success
Started	...
Astrometry.net job	864910
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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