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Old 22-08-2016, 07:56 PM
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RickS (Rick)
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Grus galaxies - the don't bring me down cluster*

* Astrofest in joke

Capture:
Taken at Qld Astrofest 30 June to 5 Aug 2016

Objects in image:
NGC7599, NGC7531, NGC7590, NGC7582, NGC7552, Abell 1111, and 800+ PGC galaxies

Scope: AP140EDF/reducer = 771mm FL
Mount: AP900
Camera: U16M
Filters: Astrodon E series Gen 2 LRGB, 3nm Astrodon Ha, 3nm Astrodon Oiii
Guiding: Lodestar / Borg 50mm guide scope
Image scale: 2.41 arcsec/pixel (drizzled to 2x then reduced to 75%)
Exposures: 36x600s L, 14x900s R, 12x900s G, 12x900s B (15.5 hours)
Processing: PixInsight 1.8

The attached image is a small crop as it is difficult to reduce this to a 200Kb jpeg. Higher res larger crop on Astrobin: http://www.astrobin.com/full/260775/B/ It's worth zooming around the full res version.

Hope you enjoy the image and I always appreciate constructive criticism

Cheers,
Rick.
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  #2  
Old 22-08-2016, 08:11 PM
el_draco (Rom)
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That's a Dr Who view! Drop dead gorgeous
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Old 22-08-2016, 08:12 PM
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Hi Rick,
That's majestic! Well done.
How small we are....

Can I ask what you do exactly with the drizzling of data such as this.
Thanks,
Regards,
Tim
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Old 22-08-2016, 08:16 PM
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atalas
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That's a great short Rickthat galaxy lower left,is that tidal tales showing?
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Old 22-08-2016, 08:36 PM
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Quote:
Originally Posted by el_draco View Post
That's a Dr Who view! Drop dead gorgeous
Thanks, Rom.

Quote:
Originally Posted by topheart View Post
Hi Rick,
That's majestic! Well done.
How small we are....

Can I ask what you do exactly with the drizzling of data such as this.
Thanks, Tim. We are small indeed!

When significantly undersampled, I use drizzle integration to increase the resolution, usually by a factor of two, and then downsample when I finish processing if the data doesn't quite hold up at full res. With the AP140 set up at 2.4 arcsec/pixel I'm invariably undersampled even in terrible seeing. This time I doubled the res and then did a final resample at 75% to give a 50% resolution increase over the original data.

Hope that answers your question?

Quote:
Originally Posted by atalas View Post
That's a great short Rickthat galaxy lower left,is that tidal tales showing?
Thanks, Louie. I thought that was a reflection initially but it has a PGC number so I think it's yet another galaxy. There are supposed to be some faint tidal tails between members of the quartet and I was hoping to capture them but I can't see them even with averted imagination
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Old 22-08-2016, 08:45 PM
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Camelopardalis (Dunk)
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Erm...the background just looks a little too black...

Just kidding...looks stunning Rick
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Old 22-08-2016, 08:47 PM
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strongmanmike (Michael)
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Quote:
Originally Posted by RickS View Post
There are supposed to be some faint tidal tails between members of the quartet and I was hoping to capture them but I can't see them even with averted imagination
Bah! easy for me, clear as day those tidal streams

Another great wide field galaxy shot Rick, always fun to peruse such fields looking at all the cool bits and this field has sooo many galaxies, well done

Mike
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Old 22-08-2016, 08:48 PM
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Hi Rick

Yeah I ask dude because I would of thought It to be quite difficult at this scale....I never look at maths behind these things...just easier to ask....too lazy.
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Old 22-08-2016, 08:49 PM
topheart
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.... and then did a final resample at 75% to give a 50% resolution increase over the original data.

Hope that answers your question?

I was more asking about the steps in PI within the Star Alignment module.....Does the final re-sample equate to the "drop shrink"??

Thanks,
Tim
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Old 22-08-2016, 08:57 PM
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jjjnettie (Jeanette)
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An image of epic proportions.
Jeff Lynne would be proud.
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Old 22-08-2016, 08:59 PM
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RickS (Rick)
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Quote:
Originally Posted by Camelopardalis View Post
Erm...the background just looks a little too black...

Just kidding...looks stunning Rick
You could be right, Dunk. I'm never quite sure if I've gone too far either way... at least until a few days later when I'm sure I got it wrong

Quote:
Originally Posted by strongmanmike View Post
Bah! easy for me, clear as day those tidal streams

Another great wide field galaxy shot Rick, always fun to peruse such fields looking at all the cool bits and this field has sooo many galaxies, well done
Ta, Mike. Your rendition from ages ago (2009?) was a bit of an inspiration for me and still looks damn fine

Quote:
Originally Posted by atalas View Post
Hi Rick

Yeah I ask dude because I would of thought It to be quite difficult at this scale....I never look at maths behind these things...just easier to ask....too lazy.
With this fairly fast combination of scope and camera I thought I'd have a good chance of pulling out any faint detail like that, Louie, but I got a bunch of IFN (which I didn't try to push this time around) and no tidal tails. I've not seen any images that show them so maybe they are really faint or maybe even nonexistent

Quote:
Originally Posted by topheart View Post
I was more asking about the steps in PI within the Star Alignment module.....Does the final re-sample equate to the "drop shrink"??
I used DrizzleIntegration with a Scale of 2 and adjusted Drop Shrink to taste (the default of 0.9 was good this time.) That gave me double res data (8192x8192 pixels) which I processed to completion. Then I used the Resample process at 75% to downsample the final image.

Cheers,
Rick.
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Old 22-08-2016, 09:01 PM
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RickS (Rick)
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Originally Posted by jjjnettie View Post
An image of epic proportions.
Jeff Lynne would be proud.
Thanks, JJJ
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  #13  
Old 22-08-2016, 09:13 PM
Placidus (Mike and Trish)
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Such a rich field, Rick. Running out of superlatives. Beautiful colour and contrast - a jewel-box of galaxies.
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  #14  
Old 22-08-2016, 09:19 PM
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RobF (Rob)
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You got me runnin' goin' out of my mind Rick!

Top shot. Wonderful view of this cluster.
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  #15  
Old 22-08-2016, 09:28 PM
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Atmos (Colin)
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The detail in all of those galaxies is extraordinary! You mentioned you were a bit worried about the colour version not being as well as the straight luminance, nothing to worry about there!
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Old 22-08-2016, 09:44 PM
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Beautiful dEtaiL in thOse galaxies Rick.
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  #17  
Old 22-08-2016, 09:45 PM
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RickS (Rick)
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Quote:
Originally Posted by Placidus View Post
Such a rich field, Rick. Running out of superlatives. Beautiful colour and contrast - a jewel-box of galaxies.
Thanks, M&T!

Quote:
Originally Posted by RobF View Post
You got me runnin' goin' out of my mind Rick!

Top shot. Wonderful view of this cluster.
Ta, Rob

Quote:
Originally Posted by Atmos View Post
The detail in all of those galaxies is extraordinary! You mentioned you were a bit worried about the colour version not being as well as the straight luminance, nothing to worry about there!
Thanks, Colin. I'm pretty happy with the end result but it took some work to get there. Just occasionally an image comes together really quickly and easily but this wasn't one of those
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  #18  
Old 22-08-2016, 09:45 PM
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RickS (Rick)
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Beautiful dEtaiL in thOse galaxies Rick.
Nicely done, Pete
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Old 22-08-2016, 11:19 PM
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Quote:
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You got me runnin' goin' out of my mind Rick!

Top shot. Wonderful view of this cluster.
It makes us feel like we're wasting our time with our little scopes and cameras.
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  #20  
Old 23-08-2016, 03:13 AM
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billdan (Bill)
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Congratulations Rick, truly awesome image, I remember the luminous version you posted up recently. But the colour version is just "out of this world".

Cheers
Bill
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