N70 Super Bubble Nebula in NB colour 76hrs

[Bassnut (Fred)]

Hi Guys

This image has been very difficult to produce and ended up with too many artifacts in a vain attempt to make a pretty pic. There are good reasons why other examples are rare and ordinary, its dim. The 40min subs are mostly buried in noise hence the need for 72hrs. Im not sure now if its worth the bother, this sort of caper. Target choice needs more research in the future . Click here for big.

N70 in Ha,SII,HA,OIII mapped as LRGB. Ha 63 42hrs, SII 17hrs and OIII 26 hrs Ha 40min subs bin2, SII and OIII 40min subs bin2.

This is a borrowed description
Henize 70 (N70, DEM L301) is part of the Large Magellanic Cloud in the southern constellation of Dorado about 170,000 light years distant. Henize 70 is a superbubble in which fast, energetic stellar winds from massive, hot stars (OB association LH 114) clear out a bubble from the surrounding interstellar medium. You can see a group of hot blue stars near the center of the bubble. The energy released into the bubble ionizes elements, such as hydrogen, oxygen and sulfur, and causes them to glow. It has also been suggested (Skelton et al., Pub Astro Soc Pac, III, 465-481, 1999) that supernova explosions within the last million years also contributed to the structure of the nebula. The nebula is about 300 light years across.

[multiweb (Marc)]

that's pretty awesome Fred. Love the colors and details!
And it's got stars in it too... what's going on? A weak moment?

[alpal]

Hi Fred,
I googled the target & I couldn't find a picture anywhere near as good.
Well done.

cheers
Allan

[gregbradley]

A phenomenal image, well worth the effort. Its like an amateur first.

Greg.

[RickS (Rick)]

Well done, Fred! Someone has to have a go at these things. It's not a stunning object but it still shows some interesting detail and colour and you have a unique image.

Cheers,
Rick.

[DJT (David)]

Hi Fred. Love the image. If you have the kit and location you may as well go for the hard to do objects because as you say, no one else is. Well worth it in my view.
Top job

[SimmoW (SIMON)]

That looks excellent, nice details considering the faint target

[Andy01 (Andy)]

Not much to say that does it justice but all hail the Narrowband king!
We are unworthy to stand in your presence master

Just awesome, 72 hrs? Is that a record? Wow!

[FlashDrive (Poppy)]

Very nice indeed ... great colours ... a top capture..

Col....

[Leonardo70 (Leonardo Orazi)]

Wonderful result.

All the best,
Leo

[Paul Haese]

You are the mega king Fred. Lots of detail in your image. Not sure about the colour palette, but that is my taste talking here. I am just wondering if you have a couple of subs there that are a little less sharp than the bulk? The focus looks slightly soft to me on the full res.

[strongmanmike (Michael)]

Great stuff Freddo lots of exposure as usual and it does look deep, Steve Crouch did a nice one of this with his old 12.5" RCOS too

Mike

[Placidus (Mike and Trish)]

Fantastic, Fred,

This sort of image would have been utterly impossible a generation ago. I really believe it is worth the effort - the superbubble is special and you've caught it. You've really got the SII nicely.

What is RA/Dec and angular diameter?

Best,
Mike

[Bassnut (Fred)]

Originally Posted by multiweb

that's pretty awesome Fred. Love the colors and details!
And it's got stars in it too... what's going on? A weak moment?

Thanks Marc. The artifacts were more obvious starless, thats why . I took RGB for stars, but they looked big and messy.

Originally Posted by alpal

Hi Fred,
I googled the target & I couldn't find a picture anywhere near as good.
Well done.

cheers
Allan

Thanks Allan. Some others are good, but mostly just bright red mono (Ha) or bicolour.

Originally Posted by gregbradley

A phenomenal image, well worth the effort. Its like an amateur first.

Greg.

Thanks Greg. Well, 1st, no , but possibly unique in that I took Ha, SII and OIII. Interestingly, IMO, the AAO pic is very ordinary, but that was with film.

Originally Posted by RickS

Well done, Fred! Someone has to have a go at these things. It's not a stunning object but it still shows some interesting detail and colour and you have a unique image.

Cheers,
Rick.

Thanks for not looking tooo close Rick . I think I perform an important public duty , like you say, someone has to do it.

Originally Posted by DJT

Hi Fred. Love the image. If you have the kit and location you may as well go for the hard to do objects because as you say, no one else is. Well worth it in my view.
Top job

Thanks David, yes, the ability to do the hours tempts me I must say.

Originally Posted by SimmoW

That looks excellent, nice details considering the faint target

Thanks Simon.

Originally Posted by Andy01

Not much to say that does it justice but all hail the Narrowband king!
We are unworthy to stand in your presence master

Just awesome, 72 hrs? Is that a record? Wow!

Oii Andy, easy with that, or Ill start likin that kinda talk . The likes of yourselves and a few others have certainly raised the bar seriously lately .

Originally Posted by FlashDrive

Very nice indeed ... great colours ... a top capture..

Col....

Thanks Col

Originally Posted by Leonardo70

Wonderful result.

All the best,
Leo

Thanks Leo

Originally Posted by Paul Haese

You are the mega king Fred. Lots of detail in your image. Not sure about the colour palette, but that is my taste talking here. I am just wondering if you have a couple of subs there that are a little less sharp than the bulk? The focus looks slightly soft to me on the full res.

Thanks Paul. I tried some other palettes, bright red looks good, had to pick just one. The noise was very high, so smoothing was required and loss of sharpness. Ive noticed a few rock stars would rather leave backgrounds a bit gritty rather than smooth and process the hell out of images. I must say that can look much better.

Originally Posted by strongmanmike

Great stuff Freddo lots of exposure as usual and it does look deep, Steve Crouch did a nice one of this with his old 12.5" RCOS too

Mike

Thanks Mike. Yes Steves is good, hes done a lot of hard ones over many years. He was the 1st for many.

Originally Posted by Placidus

Fantastic, Fred,

This sort of image would have been utterly impossible a generation ago. I really believe it is worth the effort - the superbubble is special and you've caught it. You've really got the SII nicely.

What is RA/Dec and angular diameter?

Best,
Mike

Thanks Mike, the SII was a hard part, extremely noisy. Others have skipped SII altogether and used Ha for red.

RA: 5hr 43m 15s
Distance: 170,000 Image Size: 33' x 33'
DEC: -67d 54m 7s

[Paul Haese]

Originally Posted by Bassnut

Thanks Paul. I tried some other palettes, bright red looks good, had to pick just one. The noise was very high, so smoothing was required and loss of sharpness. Ive noticed a few rock stars would rather leave backgrounds a bit gritty rather than smooth and process the hell out of images. I must say that can look much better.

Ah that makes sense. Faint stuff, lovely noise .

Would you use a median combine on each channel? That might kill the noise.

[Flugel88 (Michael)]

Fred this is by far the best n70 image i have ever seen.
76 hours is a real marathon effort.
I think it was worth it to achieve the best.