Ngc 3981

[marc4darkskies]

NGC 3981 is a small spiral galaxy in Crater that's rarely imaged by amateurs and I can see why; it's a difficult target with only a small central spiral and outer reaches that are very faint! The bright central structure is only 4 x 1 arcmins. Its very faint outer structures extend to roughly 8 x 5 arcmins and suggest some kind of interaction with another galaxy long ago. Lots of tiny faint fuzzies are visible in the frame too. It's part of the NGC 4038 group, named after one of the pair of galaxies called The Antennae.

As you'd expect I can't compete with the amazing renditions done with the 8.2m ESO and other 1m class scopes in Chile; the predominant images on the web. Having said that, the main structures compare well as does the detail in the core, so I'm happy with that! :cool: Imaged over 5 nights, it was a struggle getting enough clear sky and there was much waiting with many subs thrown away due to poor seeing.

This is an LRGB image. L=360 mins, R=165 mins, G=135 mins, B=180 mins for a total of 14 hours. To be honest I need double the integration time in excellent seeing to do any better!!

The FOV (cropped for composition purposes from the full frame): 34.4 x 22.9 arcmins. Seeing was average and ranged from 1.9 to 2.6 arcsecs per pixel FWHM. Thankfully, luminance was gathered during relatively good seeing ~2.1 arcsec FWHM.

5 May: image updated with 160 minutes of synthetic luminance (Ls) to significantly improve background noise levels.

Screen sized version: https://pbase.com/gailmarc/image/171591431/original
Full Res: https://pbase.com/gailmarc/image/171591434/original
Annotated: https://pbase.com/gailmarc/image/171591432/original

[JA]

Looks wonderful Marcus:thumbsup:
BTW only the forum image is accessible, each of the 3 hyperlinks say they require a password.

Best
JA

[multiweb]

The link (s) ask for a pwd?

[h0ughy]

How you imaged while enjoying your self at the beach has me scratching my head, but the password protected image still has me scratching

[marc4darkskies]

Hmmm, weird. I didn't set a password! Try it now.

[marc4darkskies]

Yeah - should be good now.

[h0ughy]

ooooohhhhhhhhh niiiiice. it is a little gem

[gregbradley]

That is a sensational image! Look at that distorted halo - its massive.

I've never seen this one before.

Terrific work.

Greg.

[matlud]

Fantastic image Marcus, love the faint halo and lots of other small galaxies in the field :thumbsup:

[strongmanmike]

Yeah, rather cool image Marcus :thumbsup:, stars do look kind'a little fuzzy, pom, pom like (seeing?) but an intriguing galaxy none the less, that I have considered hitting too, but, you know...too many galaxies, not enough time DOH! :rolleyes: :sad:

Mike

[Ryderscope]

Beautiful work Marcus. A complex and intriguing target :thumbsup:

[Dave882]

Great work to get all that detail! Your patience and perseverance have really paid off!!

[Robert_T]

Way above my pay grade in skill and knowledge in terms of capture but can't argue with the result... it does look like something has move through and torn away an outer arm in the dim dark past... I always find these Galaxy shots when you start noticing even fainter background galaxies a little humbling too. Thanks for sharing Marcus.

[multiweb]

Really nice shot. Beautiful galaxy, seriously disturbed. I really like the field color and all the faint fuzzies too. One for the cool wall. :thumbsup::thumbsup::thumbsup:

[marc4darkskies]

Thanks Dave!



Much appreciated Greg! I only discovered it online myself earlier this year - I saw Adam Block's amazing rendition (using 1m scope on top of a mountain in Chile)



Thanks Mathew! I wish I had twice the data though (with excellent seeing) - those faint fuzzies and stars would have popped much more!



Thanks Mike.



Pixel peeper alert!! :help2: Seriously? Pom poms? Yes, less than excellent seeing had an impact for sure so I deliberately went easy on my star shrinking to make sure faint fuzzies and stars weren't wiped out. And don't forget I'm imaging at 0.59 arcsecs/pix - very unforgiving with less than excellent seeing.



Cheers Rodney! It was a tough one to do but I'm very pleased with how it turned out!



Thanks very much Dave. I sometimes wish deep space astrophotography was easier - but not really. :) I enjoy the challenge and the many hours that go into creating a nice image.



Thanks Robert! It's fun to imagine what encounters it may have had to create such disruptions



Cheers Marc, much appreciated! "Seriously disturbed" - I like that. Reminds me of me. :P :help: :lol:

[markas]

Terrific result! I know from experience this is not an easy target......


Mark

[Andy01]

Hi Marcus, well done! :thumbsup:
The galaxy itself looks fantastic with details, tidal streams the whole shebang!
However, I'm sorry to point this out but the larger stars look just plain wierd. :question:
ie: the cores of the bright blue & yellow ones look pink with odd burnt in highlights, which is a distraction when everything else is exactly on point.
Might be worth another look at those. :D
Composition is also spot on, and well framed avoiding the standard 'plonk the galaxy in the centre of the frame' routine. :thumbsup:

[marc4darkskies]

Thanks very much Mark! I think I'd like to do an easy target next!! :lol:



Cheers Andy, glad you liked it!! And ...



Aaaargh!!! How did I let that get past me!! :doh: That's what happens when you stare at an image long enough - you get blind to it's faults. I also rushed it a little. Anyway, don't apologise for giving honest and constructive feedback - you were spot on with your critique! Hopefully it's fixed now - at least improved. BTW, those stars were all saturated during the 15 minute subs. I'll go back to search for other clangers now! :) Thanks again!

[Andy01]

Bingo, that's the money shot now alright! :D
Top stuff Maestro :thumbsup:

[marc4darkskies]

Cheers Andy!

Money shot eh? Wonder what I could get for it. :question: 50c maybe? :P

[Geoff45]

Very interesting structures there Marcus. Well worth the time investment.
Geoff

[strongmanmike]

I dunno, it looks like a pretty damaged galaxy to me...:shrug:

:P

[TrevorW]

Very impressive image Marcus :)

[marc4darkskies]

Thanks Geoff! I was pleased with the structural detail revealed. There was a respectable correlation with big Chilean telescope versions too.



Sorry, that 50c was mates rates only (ie for those who live under rural skies on acreage and not in yuppie city apartments with a built in micro brewery). :P To you, the price is $3, 981. 50.

[marc4darkskies]

Cheers Trevor! Glad you think so.

[strongmanmike]

Aaaah...Upstairs Downstairs Huh? ;)

[topheart]

Wow!
A great image of a fantastic object!
Congratulations!

Cheers
Tim

[marc4darkskies]

Thanks very much Tim! Your "wow" is much appreciated!