Sharpless 2-308

[rat156]

Hi All,

Following on from Bert's excellent image, here's mine.

Bicolour with Ha mapped to red (2 hours), OIII mapped to blue (5.75 hours) and a composite used for the green channel. This nebula is really quite dim, some of the OIII from last night are smoke or haze affected, might get some more data if it clears tonight.

Larger version here (http://www.astrobin.com/77670/)

Cheers
Stuart

[dvj]

Great color, detail and depth. Your ASA is working quite nicely with the 8300.

[Rod771]

Very nicely done Stuart. :thumbsup:

[Astro_Bot]

Nice one. :thumbsup:

(One odd thing - the star halos don't seem to be perfectly centred on the bright stars - any idea why?)

[Peter Ward]

Stu... you are force to be reckoned with of late :)...consistently excellent images.

Thanks for posting :thumbsup::thumbsup:

[DavidNg]

Hi Stuart,

What a beautiful image :) Love it.

Regards

[alpal]

Hi Stuart,
Nice image.
The stars are very slightly elongated -
maybe a guiding problem?
Yes - last night had a brown haze from all the smoke.

cheers
Allan

[rat156]

You know Al, I was looking at this this morning, I also thought this, then I blew the image up and put my reading glasses on and they looked round again. I was going to go to the optometrist to get checked out for astigmatism. I've been thinking I've been a bit astigmatic for a little while now, old tired eyes, makes it hard to judge when things are right, particularly when focusing. If they are out of round it'll be a registration problem.

Can anyone confirm that the stars are elongated up and down in the image? Preferably someone with good vision.

Cheers
Stuart

[Rod771]

I had a look at the full rez version on Astrobin , the stars are ever so slightly enlongated vertically, more noticable in the smaller stars. But geez! I reckon that's getting really picky (on my part).

You've been pumping out some great images lately Stuart :)

[cometcatcher]

That's a mighty fine image there Stuart. Interesting bi-colour colour mapping that works well.

[alpal]

Maybe I was too picky -
it's too hard to tell without the RAW data so
it's not a problem.

[dutch2]

Wow, what a sunning image.
Just gorgeous.
Well done:thumbsup::thumbsup:

[RickS]

Very nice image, Stuart.

[strongmanmike]

Excellent version of this object.. different to but as far as a pleasing look goes, pretty much on a par with Marco's amazing version last year, shows how the same object can be imaged and processed in two quite different ways and a fine pleasing view can still be had :) I too could see the elongated stars though..but I agree, it's not an issue and doesn't stop it being a show stopper.

MIke

[rat156]

Maybe picky Al, but I don't mind. I've reduced the star sizes and posted a new version on Astrobin.

Cheers
Stuart

[atalas]

Love bubbles in Space! great job Stuart.

[rat156]

Thanks.

The reflections are not axisymmetric because they arise not on the imaging axis. I have found a couple of research papers on removing them, but none really explain why they aren't symmetrical about the star.

Someone here with more optics knowledge than I can explain it I'm sure.

Cheers
Stuart

[rat156]

Consistently good weather helps Peter, like anything, you get better with practice.

Cheers and Thanks
Stuart

[rat156]

Hi Mike,

Even got some star colours in there for you, they aren't correct, but hey, it's a start!. I had a look at Marco's image, it is great, I need darker skies. I'll certainly add some more imaging time to this one (one, to fix the elongated stars, two to get more detail in the nebula, but it's going to be hard to compete with Coona for dark skies.



Thanks Louie, you can take credit for at least some of this one, I've been using (and probably abusing) some of you processing techniques that you have made tutorials for, I love them, they are great.

Cheers
Stuart

[alpal]

Looks great Stuart.
It's the kind of target you can add to over the years to build up even more data.


cheers
Allan

[Logieberra]

Stuart, real nice! The upper right of the image - outer shell and bright star region - really draws me in. Pretty!

[gregbradley]

Great image Stuart. Very delicate and interesting.

Greg.

[ozstronomer]

Really nice image Stuart, lots of detail in the bubble :thumbsup:

[Shiraz]

Gorgeous image Stuart. regards Ray

[Rod771]

Its now image of the day on Astrobin , woo hoo!! :2thumbs:

[SimmoW]

Bloody bewdiful!! So 3 dimensional

[tilbrook@rbe.ne]

Top work Stuart!:thumbsup:

Really looks 3D.

Cheers,

Justin.

[rat156]

Yeah, quite chuffed about that. I'm liking Astrobin as a place to host my images more and more, I like that you can put up larger images and I really like the plate solve. Their method of deciding the IOTD is quite democratic. No point making your own website now.

Cheers
Stuart

[Rod771]

Yes I quite like it too. I saw your image in the banner when uploading some pics today.

Well done mate :thumbsup:

[avandonk]

Stuart your image looks quite ethereal. The fine detail is quite apparent. The assignment of NB to colour is quite interesting as looks close to 'natural'.

I see my little F3 astrograph as an early forward scout to look for suitable targets for the BIG guns! It would be a waste of valuable imaging time to use a long slower focal length instrument to see if a dim object can be imaged.

We ALL stand on the shoulders of giants to see further except maybe Mike S.

Bert

[avandonk]

The 'continuum haloes' are out of focus images of reflections that arise from 'non reflecting' lens surfaces and or filters that are in your image train. This is common in mirror lens assemblies.

Modern detectors are so sensitive that there is no such thing as a 'non reflecting' optical surface where lenses/filters are involved.

The reason for being non concentric is that they are a projection of the reflecting surface and it's view of the entrance aperture of your optic in relation to the bright star's off axis position.

I hope this is clear?

bert

[SkyViking]

Wow that's one fine image of this huge bubble. Great work, the detail and processing is really impressive. And the 3D effect is obvious, nicely done!

[rat156]

Thanks for the praise Bert, and thanks for finding stuff for us to shoot. You don't want me standing on your shoulders for too long though, might cause serious injury.

Cheers
Stuart

[Ross G]

What a beautiful photo of an amazing looking object Stuart.

Inspiring work!

Ross.

[Paul Haese]

A stand out image this one. Great sharp detail and nicely processed. Some more data would improve the very minor background noise and give the signal some lift but probably not really all that necessary. Well done.