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Old 08-08-2020, 04:34 PM
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SH2-308 The Dolphin Nebula

This was taken over 2 years. Its really a dark site target as its very faint and only really shows up in O111. So a 3nm O111 filter would have been handy here.
This is 14 hours and 29 minutes of O111, Ha, LRGB. Even so there is some residual noise. A bit of tilt hadn't been corrected at this stage so there is a little bit if you look for it.

FLI Proline 16803, AP Honders Riccardi 305mm F3.8.

I was amazed by the photos I had seen of this object. There aren't many images of it I guess because it is so faint. I wanted to image this object for quite a while now. It was also extremely hard to process. I had several goes at it and would hit a dead end and I would leave it to come back to later. Today I managed to get an image I liked.

Taken from my home observatory.


https://pbase.com/image/170938973/large

Repro version:

https://pbase.com/gregbradley/image/170941951/large regular size

https://pbase.com/gregbradley/image/170941951/original large size

Greg.
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Last edited by gregbradley; 10-08-2020 at 10:43 AM.
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Old 08-08-2020, 04:36 PM
VPAstro (Andrew and Cam)
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Well done Greg, great image!
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Old 08-08-2020, 04:54 PM
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That's very nice indeed. The waves of OIII around the cosmic bubble look great
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Old 08-08-2020, 05:44 PM
Placidus (Mike and Trish)
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That's superb Greg. Your field is wider than ours. We have to do a bit of a mosaic to do just the dolphin. You've managed to show some ridiculously faint tendrils in the general background material outside the WR nebula itself.
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Old 08-08-2020, 06:32 PM
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graham.hobart (Graham stevens)
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dolphin

Amazing greg-really well defined
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Old 08-08-2020, 08:50 PM
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Quote:
Originally Posted by VPAstro View Post
Well done Greg, great image!
Thanks very much. It was a very challenging image.

Quote:
Originally Posted by ChrisV View Post
That's very nice indeed. The waves of OIII around the cosmic bubble look great
Yes its a very interesting bubble. That yellowish bright star is a powerful star.

Quote:
Originally Posted by Placidus View Post
That's superb Greg. Your field is wider than ours. We have to do a bit of a mosaic to do just the dolphin. You've managed to show some ridiculously faint tendrils in the general background material outside the WR nebula itself.
Thanks M&T. I'll have to look your image up again. It is quite a wide object.

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Amazing greg-really well defined
Thanks Graham. I am glad the hard work paid off, it wasn't looking too promising for a while.

Greg.
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Old 08-08-2020, 08:55 PM
JA
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Greg: The Dolphin Lives
very well defined

Best
JA
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Old 08-08-2020, 09:28 PM
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Quote:
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Greg: The Dolphin Lives
very well defined

Best
JA
Hehehe, cheers JA.

Greg.
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Old 09-08-2020, 07:06 AM
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strongmanmike (Michael)
Woohoo it's clear

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It's one of the most fascinating objects in the entire sky I recon..? It looks a little pushed but you have gone pretty deep here Greg. Great that you have so much data sitting around, you have been having lots of fun combining data lately, huh? sooo jealous (in a good way) of you two observatories with such great equipment

Mike
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Old 09-08-2020, 07:28 AM
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It's one of the most fascinating objects in the entire sky I recon..? It looks a little pushed but you have gone pretty deep here Greg. Great that you have so much data sitting around, you have been having lots of fun combining data lately, huh? sooo jealous (in a good way) of you two observatories with such great equipment

Mike
Thanks Mike. Its slightly pushed. I did wonder about that myself but decided it was overall a more impactful image but sometimes thats a hard call.It was surprisingly bright in the 330 minute O111. 12 inch F3.8 is pretty fast eh?
Yes the 2 observatories are fun but your setup is not so different 106/5 and 305/3.6. Apart from the CDK17 we are very similar.
Greg.
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Old 09-08-2020, 07:50 AM
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Yes the 2 observatories are fun but your setup is not so different 106/5 and 305/3.6. Apart from the CDK17 we are very similar.
Greg.
Yeah, I know, I don't want to sound ungrateful, I am very fortunate to have what I have (even if I do have to push my dome all night )...still, I don't have those pristine dark skies of Bigga! ...I want M&T's CDK20 on the fork mount, on top of its own damn hill...behind my bloody house! that's what I really want!!

Mike

Last edited by strongmanmike; 09-08-2020 at 08:07 AM.
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Old 09-08-2020, 08:26 AM
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My God it's full of stars

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Sorry Greg, I agree it looks great at first, but when you dive into the high res the the stars look chunky.
The data is fantastically deep but because you've stretched the heck out of it it looks unnatural.
I encourage you to have another go - but tone map so you remove the stars first, Starnet++ is perfect for this - then stretch it as you have & the pop the stars back in.

Here is a great video tutorial by JP Metsavainio on how it's done.
https://www.youtube.com/watch?v=EQlGsM-S8vM
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Old 09-08-2020, 08:27 AM
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Mike[/QUOTE]

Quote:
Originally Posted by strongmanmike View Post
Yeah, I know, I don't want to sound ungrateful, I am very fortunate to have what I have (even if I do have to push my dome all night )...still, I don't have those pristine dark skies of Bigga! ...I want M&T's CDK20 on the fork mount, on top of its own damn hill...behind my bloody house! that's what I really want!!

Mike
Yes I hear ya. This image though was taken from Kurrajong.
I just used the EZ Processing Suite EZ Denoise that Lewis posted about.
Wow, an easy to use Pixinsight tool - good trend. It worked surprisingly well - I likeh whad I see!
and reduced some of that pushed look which also amplifies existing noise.
Same links.

Greg.
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Old 09-08-2020, 08:41 AM
jahnpahwa (JP)
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So unreal!! What a cool object, and you've got some great colour there too.


Thanks for posting, its just a great one to admire

Last edited by jahnpahwa; 09-08-2020 at 09:06 AM.
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Old 09-08-2020, 08:50 AM
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So unreal!! What a cool object, and you've got some great colour there too.


Thanks for posting, its just a great oneto admire
Thanks Jahnpahwa. I am glad you liked it.

Greg.
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Old 09-08-2020, 11:21 AM
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multiweb (Marc)
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Pretty deep shot. Colors are great. Gotta agree with the stars off axis. You might have got some registration issues.
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Old 09-08-2020, 12:27 PM
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Retrograde (Pete)
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Amazing depth on this Greg.
Don't think I've ever seen the faint wisps surrounding it captured so well.
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Old 09-08-2020, 03:26 PM
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Quote:
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Pretty deep shot. Colors are great. Gotta agree with the stars off axis. You might have got some registration issues.
Thanks,trying to get to the bottom of the stars.

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Amazing depth on this Greg.
Don't think I've ever seen the faint wisps surrounding it captured so well.
Thanks Pete. I was happy about that.

Greg.
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Old 09-08-2020, 04:05 PM
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Wow, that reeks of time and effort and it all really paid off. Congrats Greg.
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Old 09-08-2020, 04:38 PM
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Wow, that reeks of time and effort and it all really paid off. Congrats Greg.
Thanks Rob. Yes it did take a while both acquiring the data and processing it.

Greg.
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