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RobH

IC 5146, The Cocoon nebula

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Hello all.

The Cocoon nebula, IC5146, is a combination of both emission and reflection nebulae, and is also surrounded by the dark nebula, Barnard 168, some of which is visible in this image.

It is about 4000 light years away and 15 light years across and is an active star forming region. The central star is thought to have formed 100,000 years ago.

The strong red colour is from the hydrogen gas cloud, which is being excited by the young hot stars within it and is glowing strongly in the HII part of the spectrum. These are also lighting up the surrounding molecular cloud, which is the reflection part of the nebula, and is the blue in the image.

The data for the image was gathered between June and early August, between work and clouds!

I initially got some OIII data for this, but it was very weak as the nebula doesn’t glow in this region, so I didn’t use it in this image, and gathered RGB data to add to the Ha that I’d first obtained.

It could really do with more data, especially blue, but having spent 2 months on it, I felt it was time to move on!

Imaged with a TMB152 @ F8, Atik 16HR and astronomic filters from Weymouth, Dorset.

Ha. 17 x 8 minutes

R. 22 x 6 minutes

G. 19 x 8 minutes

B. 15 x 8 minutes

Total imaging time. 9 hrs 46 minutes.

Cheers

Rob

post-14403-133877394211_thumb.jpg

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WOW !!!!!!!!!!!!

That is amazing mate.

Makes me want to add another 4 hours onto my attempt.

Never seen the semi circle shape to the RHS of the image before. Makes you think there was an explosion bubble to the RHS of the nebula.

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I like that a lot Rob, there's some very nice subtle detail in the m8.

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Incredible image, interesting information too.

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Superb Rob. Great contrast and the outer mistiness is beautiful.

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Beautiful Colours there. Looks very Magical

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Another beautifully detailed masterpiece Rob. I love the colour tones in the nebula and the star colours. The blue reflection parts are showing really well.

Regards

Kevin

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ditto all what has already been said Rob,,simply stunning..hats off to ya mate.

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Great job on this one Rob, you've caught loads of the faint blue stuff there. The colours look spot on to me.

Tim

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Another one from the top drawer Rob, the Blue I can't recall seeing before and it gives it a whole new aspect for me anyway!

Tony..

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Lovely image, Rob - beautiful colours. I am relieved to see the 'mistiness' around the periphery as I always get this to some extent and wondered if it was something I was doing but to have confirmation that it really is there is good news! It hadn't occurred to me that this was one of those objects that has both emission and reflection regions but you have captured both beautifully.

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Thanks for the kind words everyone :)

It's a relief to get a new image posted fiinally!!

I forgot to mention that the red channel is actually a 50/50 blend of red and Ha.

I shot some widefield of the region at the same time with my WO 80mm and I now need to do a combination of the two....the widefield wasn't centred but there's still quite a lot of the dark nebula showing, although I doubt I have enough data to get much colour into it.

The colour data was shot unbinned, and maybe next year I'll add to it as it should be possible to squeeze more from it, but there wasn't enough data with this image.

Cheers

Rob

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Hello Rob wonderful image and to get that brown stuff at 2 O'Clock pos'n is so difficult, think I saw it in R.Crowman image. The stars are fairly colourless around Cocoon but you have really brought the colours out. 2 months spent justified by the result you've got - your TMB sees more than most.

JohnH.

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Beautiful as always Rob... I really need to get into yours and TJ's habit of staying on the same target for a long time :)

Cheers,

Richie

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Well Rob if anyone anywhere has taken a Cocoon to compare with that one I have not seen it. The image is out of sight. I love the smoothness, the sense of layers of activity and the fact that you have brought to light things we don't normally even know are there. It has all the intensity that we find in the top american imagers' work without the... lack of understatement! A very British masterpiece, I think.

Olly

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Sheer perfection Rob. I doubt there are very many earth bound captures better than this. You have set a very high bar me lad.

Ron.:)

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Wow, that is the deepest Ive ever seen the cocoon, fantastic job Rob

Philj

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Hello all.

Noel Carboni pointed out that the star at the bottom left is an interesting coolour....I hadn't noticed but he's right, and it's down to a little too much star reduction in the blue layer...

so, here it is again, with the star fixed :)

Cheers

Rob

post-14403-133877394529_thumb.jpg

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Another stunning image Rob, thanks for sharing.

Steve..

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