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Old 22-01-2021, 12:01 AM
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strongmanmike (Michael)
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SH2-308 The Dolphin Nebula

I have always wanted to hit this beautiful field since first seeing this object in Marco Lorenzi's amazing ROG APOTY shortlisted image, it blew my mind, I didn't know it existed... That was back in 2012-13...so now finally it is my turn

This was taken over 5 nights for a total of over 25hrs exposure time. I was pretty happy with this, as this time of year we only get 6 hours of astronomical darkness to shoot with each night, so when you factor in manual focus checks, dither re-aquires after every exposure, sub frame image download times, manual meridian flip, etc, that's good productive imaging, for a non automated, manual dome turning, manual meridian flip and re aquire (no plate solving etc) kinda guy and I threw out not a single sub exposure after all that!! ...did drink some beer though

Sitting in a rich field of OIII and Halpha emission nebulae, a remarkable and beautiful, striated, teal coloured, almost perfectly spherical, bubble, is being blown in the interstellar medium by the intense stellar wind from a very hot and massive Wolf-Rayet star at its centre. Wolf-Rayet stars have surface temperatures of between 30 000K and 210 000 K, compared to our Sun, which has a surface temperature of just 5800K!

SH2-308 in Canis Major (click on image to enlarge and pan around with your cursor)

If you must pixel peep (or just wanna check out the amazing pin point field of the FSQ106EDX4 across the 52mm diagonal sensor ) the full size full res jpeg is HERE

Hope you like it and all imaging details are in the blurb under the image
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  #2  
Old 22-01-2021, 06:13 AM
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PKay (Peter)
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No bout adout it Mike.

All that effort and the result shows.

Remarkabubble!
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Old 22-01-2021, 07:31 AM
jahnpahwa (JP)
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Quote:
Originally Posted by strongmanmike View Post
........that's good productive imaging, for a non automated, manual dome turning, manual meridian flip and re aquire (no plate solving etc) kinda guy and I threw out not a single sub exposure after all that!! ...did drink some beer though

Whoa!! I didn't expect this at all. You're finding targets manually?
And yeah, massive high five on this one Mike, really cool to see the field surrounding this in such depth.
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Old 22-01-2021, 07:37 AM
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multiweb (Marc)
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You went to town on that one. Love the wide field especially the area at 8 o'clock. One for the cool wall.
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Old 22-01-2021, 07:58 AM
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marc4darkskies (Marcus)
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An excellent rendition Mike! Well worth the effort! Intense colours, but not over the top. Very beautiful!
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Old 22-01-2021, 08:22 AM
Placidus (Mike and Trish)
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A stunning image Mike. We've only ever seen it in extreme close-up. The widefield is totally successful.



Much to be said about dolphins and ocean waves and bright golden sand, but silence is also golden.



An average of over 4.5 hours a night, fully manually, is extremely productive.


A lovely image.
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Old 22-01-2021, 08:43 AM
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As mentioned on FB - Stunning Mike! I too have always wanted to image this in widefield, since seeing some renditions a couple of years ago. Yours however has been taken to an entirely new level of stunning! Absolutely marvellous and definitely one of your very best images to date!
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Old 22-01-2021, 08:47 AM
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Superb rendering of this object Mike. It really is a nice image. Everything is just right in my opinion.
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Old 22-01-2021, 12:24 PM
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Very nice! excellent colours and clarity
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Old 22-01-2021, 12:56 PM
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rustigsmed (Russell)
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massive effort and stunning result Mike. so much going on in the background.
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  #11  
Old 22-01-2021, 02:28 PM
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strongmanmike (Michael)
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Quote:
Originally Posted by PKay View Post
No bout adout it Mike.

All that effort and the result shows.

Remarkabubble!
Cheers Pete for you bubbly response

Quote:
Originally Posted by jahnpahwa View Post
Whoa!! I didn't expect this at all. You're finding targets manually?
And yeah, massive high five on this one Mike, really cool to see the field surrounding this in such depth.
Hi JP, I don't find targets manually as such, I do use goto and then take a succession of short exposures to hone in on the framing using my mounts hand control. The mount does a meridian flip when I command it to but then I repeat the framing process the other side when it arrives near the target, I periodically check focus between runs of filters by watching a focus star in a real time succession of 2sec exposures and press the focuser hand controls, until the focus star is as small as I can make it and I turn the dome by hand every 30min or so to keep the opening in front of the scope. I do use software to take each series of sub frames and it dithers automatically between sub frames etc..I'm just not automated as such so need to babysit my rig...so I am there for the entire 25hrs and all associated time .....

So glad you enjoyed the view

Quote:
Originally Posted by multiweb View Post
You went to town on that one. Love the wide field especially the area at 8 o'clock. One for the cool wall.
Thanks Marc, for a B&W man they are good comments

Quote:
Originally Posted by marc4darkskies View Post
An excellent rendition Mike! Well worth the effort! Intense colours, but not over the top. Very beautiful!
Thanks Marcus, I'd imagined this image for a looong time now...

Quote:
Originally Posted by Placidus View Post
A stunning image Mike. We've only ever seen it in extreme close-up. The widefield is totally successful.

Much to be said about dolphins and ocean waves and bright golden sand, but silence is also golden.

An average of over 4.5 hours a night, fully manually, is extremely productive.

A lovely image.
Actually I averaged 5hrs a night...?..didn't I?.. 25hrs/5 , I got some thin high cloud a couple'a times but it wasn't bad enough to throw any subs and one night did cloud over early. As for being fully manual, refer to comments above to JP.. not quite, I just have to be organised and think a bit

Quote:
Originally Posted by Andy01 View Post
As mentioned on FB - Stunning Mike! I too have always wanted to image this in widefield, since seeing some renditions a couple of years ago. Yours however has been taken to an entirely new level of stunning! Absolutely marvellous and definitely one of your very best images to date!
Thanks so much Andy, most glad you enjoyed it

Quote:
Originally Posted by Paul Haese View Post
Superb rendering of this object Mike. It really is a nice image. Everything is just right in my opinion.
The goldilocks image then, shall we say..?

Quote:
Originally Posted by CoolhandJo View Post
Very nice! excellent colours and clarity
Thanks a lot Paul

Quote:
Originally Posted by rustigsmed View Post
massive effort and stunning result Mike. so much going on in the background.
On ya Russel, cheers

Mike
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  #12  
Old 22-01-2021, 04:46 PM
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A fantastic image Mike. This must be one of your longest exposures. The Dolphin is a faint object and the hours paid off. Good to see all that background O111 as I wasn't sure when I imaged it if I had a gradient or if it was real.

The widefield view really suits it.

Greg.
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Old 22-01-2021, 05:17 PM
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Quote:
Originally Posted by gregbradley View Post
A fantastic image Mike. This must be one of your longest exposures. The Dolphin is a faint object and the hours paid off. Good to see all that background O111 as I wasn't sure when I imaged it if I had a gradient or if it was real.

The widefield view really suits it.

Greg.
Thanks Greg and yep, it's my 4th longest exposure, I have only done 29hrs, 32.5hrs and 52.5hrs that are greater

Mike
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Old 22-01-2021, 06:36 PM
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Nikolas (Nik)
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Is there a gif with wide eyed wow anywhere?
that is wow!!!
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Old 22-01-2021, 07:07 PM
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strongmanmike (Michael)
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Is there a gif with wide eyed wow anywhere?
that is wow!!!
Maybe this...

Thanks Saint Nik

Mike
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Old 22-01-2021, 08:48 PM
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[QUOTE=strongmanmike;

Hope you like it[/QUOTE]


Sure do! As a marine biologist - I like seeing the dolphin in the sky!


Cheers Kanga
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Old 23-01-2021, 07:12 AM
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vlazg (George)
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Oooooohh !, Very pretty Mike , great colour but not over the top as Marcus said, an interesting field, worth the effort.
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Old 23-01-2021, 08:17 PM
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strongmanmike (Michael)
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Sure do! As a marine biologist - I like seeing the dolphin in the sky!


Cheers Kanga
Cheers Peter, makes sense...does kinda remind me of an undersea vista actually

Quote:
Originally Posted by vlazg View Post
Oooooohh !, Very pretty Mike , great colour but not over the top as Marcus said, an interesting field, worth the effort.
Thanks a lot George, it is actually close to true colour, just enhanced with Ha and OIII

Mike
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Old 24-01-2021, 01:58 PM
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astroron (Ron)
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Not bad for a "portly, bit over weight middle aged, man...who eats and drinks a little too much "
In fact it's bloomin marvelous
Cheers
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Old 24-01-2021, 04:54 PM
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...does kinda remind me of an undersea vista actually
Absolutely a dolphin & great to see so much of the 'undersea vista'.
An amazing field - great stuff Mike!
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