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Old 21-02-2021, 09:09 AM
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DiscoDuck (Paul)
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The Dolphin

A shot of the Dolphin. A two panel mosaic as it is just a little too large to squeeze into my focal-reduced RC8's field of view

Not a patch on recent images of it on this forum. But I found it very faint. I don't think it is a good object to shoot from light polluted skies - Adelaide suburbs - even with narrowband I mean. In an RGB shot (included for fun below - which I used for star colours) it is all but invisible in 1 hour per colour channel.

The other little shot is an overstretched crop of the lower middle. This faint sphere is a planetary nebula separate from the main Wolf-Rayet structure. Apparently only discovered in the early 2000s. (PN G234.9-09.7)

Larger version is on Astrobin here. But it is still quite noisy, even with the ludicrous amount of data taken (70 hours shot at various opportunities over the last 3 months or so!). Shot with a ZWO 1600MM-C on an RC8 with Chroma 3nm (OIII) and 5nm (Ha) filters.

EDIT: Version linked to on Astrobin has a bit of a different colour balance following some feedback.
Attached Thumbnails
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Click for full-size image (RGB IIS.jpg)
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Click for full-size image (PN.jpg)
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Last edited by DiscoDuck; 22-02-2021 at 11:48 AM.
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  #2  
Old 21-02-2021, 12:00 PM
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You're talking down a fine image. It looks really good.

Noise with that many hours is probably best handled with some good noise reduction software.

Noel Carboni astro actions is still one of the best denoising software I have used.

Greg.
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Old 21-02-2021, 01:15 PM
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strongmanmike (Michael)
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It is just so intriguing, mystical, compelling and just plain different, that it is near impossible not to take a great shot of it...and this effort is no exception Paul

Funny, 10 years ago we never saw images of it, now it is the must do object of the summer

Mike
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Old 21-02-2021, 03:16 PM
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DiscoDuck (Paul)
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Quote:
Originally Posted by gregbradley View Post
You're talking down a fine image. It looks really good.

Noise with that many hours is probably best handled with some good noise reduction software.

Noel Carboni astro actions is still one of the best denoising software I have used.

Greg.
Thanks Greg. I'll have to check that out.

Quote:
Originally Posted by strongmanmike View Post
It is just so intriguing, mystical, compelling and just plain different, that it is near impossible not to take a great shot of it...and this effort is no exception Paul

Funny, 10 years ago we never saw images of it, now it is the must do object of the summer

Mike
Thanks Mike. Yeah, I only first came across it recently. But while imaging it over the last few months I seem to have been seeing images of it everywhere!!
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Old 21-02-2021, 11:02 PM
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PKay (Peter)
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Quite remarkable Paul.

The sphere is well defined with great depth.

Nothing but hard work and patience would give such a result.

Well done
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Old 22-02-2021, 11:47 AM
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Quite remarkable Paul.

The sphere is well defined with great depth.

Nothing but hard work and patience would give such a result.

Well done
Thank you
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Old 22-02-2021, 12:22 PM
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Great image
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Old 22-02-2021, 03:43 PM
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Great image
Thanks
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Old 22-02-2021, 07:03 PM
Placidus (Mike and Trish)
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It is excellent. You've pushed it very hard to bring out the last drops of nebulosity, and that's why the background is a bit noisy.

We found it had what we call a "glassy" appearance, as if made of ice, and yours has that glassy look also.

Seventy hours is true dedication. But you've nailed it.

Where and how big is the PN? There's something plausible overlapping the bottom edge of the dolphin. Could you mark it with an arrow on the thumbnail?
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Old 22-02-2021, 07:59 PM
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Nice one Paul - As Mike mentioned it's become the 'Nordic pine scatter cushion' nebula of choice now - everyone has one and yours is very good!
From my own experience it's a difficult target, even more so now that Mike and others have set the bar so very much higher.
70 hours though, that's hardcore!
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Old 22-02-2021, 09:11 PM
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Quote:
Originally Posted by Placidus View Post
It is excellent. You've pushed it very hard to bring out the last drops of nebulosity, and that's why the background is a bit noisy.

We found it had what we call a "glassy" appearance, as if made of ice, and yours has that glassy look also.

Seventy hours is true dedication. But you've nailed it.

Where and how big is the PN? There's something plausible overlapping the bottom edge of the dolphin. Could you mark it with an arrow on the thumbnail?
Thanks Mike n Trish. The PN is shown in the attached (courtesy of a friend)...
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Old 22-02-2021, 09:12 PM
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DiscoDuck (Paul)
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Quote:
Originally Posted by Andy01 View Post
Nice one Paul - As Mike mentioned it's become the 'Nordic pine scatter cushion' nebula of choice now - everyone has one and yours is very good!
From my own experience it's a difficult target, even more so now that Mike and others have set the bar so very much higher.
70 hours though, that's hardcore!
Thanks Andy. Yeah - if I'd known up front it was so hard under light pollution, I may have had second thoughts. Once started ... sunk cost, and all that
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