The image withstood the most astonishing amount of decon and sharpening without going too silly. We suspect without proof that bright targets and very long integration permit more deconvolution than a quick holiday snap.
Thanks again Suavi
I remember a post a long time ago by Brad Moore who took a long exposure of Eta Carnina. He showed how much extra you could apply unsharp masking with different levels of exposure. It was very clear that sharpening is way more effective on successive longer lengths of exposure.
As you say brightness would be much the same as it would be the signal strength that would be the factor.
A fantastic picture Mike & Trish.
The colour in many stars looks a little over saturated to my eye
but apart from that it looks perfect.
cheers
Allan
Thanks Allan. You're right about the stars being too saturated. I got the colour about right in the RGB image, but messed it up when combining with Lum. Please avert your gaze!
Quote:
Originally Posted by gregbradley
I remember a post a long time ago by Brad Moore who took a long exposure of Eta Carnina. He showed how much extra you could apply unsharp masking with different levels of exposure. It was very clear that sharpening is way more effective on successive longer lengths of exposure.
As you say brightness would be much the same as it would be the signal strength that would be the factor.
The image withstood the most astonishing amount of decon and sharpening without going too silly. We suspect without proof that bright targets and very long integration permit more deconvolution than a quick holiday snap.
Thanks again Suavi
I will need to one day investigate this mysterious technique that everyone is talking about!
The usual good stuff. Well done guys.
I am always intrigued by the fact that it so often happens that a quite small galaxy seems to have an overwhelmingly large effect on the larger one, but the disruption is not reciprocated.
Those out of field star flares are a real bummer. There is almost nothing worse that getting the first decent stretch of an otherwise great image and seeing one of them.
Challenge: There's a nice little "southern cross and pointers" asterism in the pic. See if you can spot it!
Geoff
M & T, Congratulations for a wonderfully sharp image with very natural looking colour. It is also my favorite interacting pair.
Peter
Thanks Peter. Nice to hear from you!
Quote:
Originally Posted by Slawomir
I will need to one day investigate this mysterious technique that everyone is talking about!
One day I would like it if deconvolution just did what it said on the label.
Quote:
Originally Posted by Geoff45
The usual good stuff. Well done guys.
I am always intrigued by the fact that it so often happens that a quite small galaxy seems to have an overwhelmingly large effect on the larger one, but the disruption is not reciprocated.
Those out of field star flares are a real bummer. There is almost nothing worse that getting the first decent stretch of an otherwise great image and seeing one of them.
Challenge: There's a nice little "southern cross and pointers" asterism in the pic. See if you can spot it!
Geoff
Hi, Geoff,
Glad you like the image. Working hard on reflection removal software. I can perfectly remove a set of perfect concentric rings, but the actual reflections must be off irregular surfaces, because they're more like streaky irregular clouds. It's proving a very difficult project.
Any hints on the Southern Cross? There's a possible candidate near the mega=bright star toward bottom left.
Hi, Geoff,
Glad you like the image. Working hard on reflection removal software. I can perfectly remove a set of perfect concentric rings, but the actual reflections must be off irregular surfaces, because they're more like streaky irregular clouds. It's proving a very difficult project.
Any hints on the Southern Cross? There's a possible candidate near the mega=bright star toward bottom left.
Thanks all.
About a third of the way in from the right hand side, bottom edge (2418, 3874)
I know im a sucker for wider fields/ context shots, but I really think a slightly wider crop to grab some of the other galaxies would perfect this one. Very unique combo here!
Mike I just noticed on my other computer which has more of a blue bias to the monitor that there are blue bands on the bottom right corner of the image that extend to just under the galaxy. What are those? Is that an arc reflection from an out of field bright star? CDKs seem prone to reflections.
I know im a sucker for wider fields/ context shots, but I really think a slightly wider crop to grab some of the other galaxies would perfect this one. Very unique combo here!
That's a cracker. I hope you submitted your image for APOD.
Thanks, Kevin, most kind. Not game to submit to APOD.
Quote:
Originally Posted by gregbradley
Mike I just noticed on my other computer which has more of a blue bias to the monitor that there are blue bands on the bottom right corner of the image that extend to just under the galaxy. What are those? Is that an arc reflection from an out of field bright star? CDKs seem prone to reflections.
Greg.
Well spotted, Greg. They are indeed reflections from upsilon 4 Eridani, which is about a degree or so out of field. Why it's worse in blue, I don't know.
Quote:
Originally Posted by Shiraz
astonishing image with some very fine detail showing and the colour is excellent. Bravo.
Thank you very much, Ray. That is indeed encouraging.
Mike, did anyone mention you have Supernova SN2016iae in the shot ?
Sheesh that's funny, I actually noted that star and for some reason actually thought in my head, "Huh..looks like a supernova"..and just brushed it off...similar to when I noticed NGC253-dw2, very similar thought and brushed it off. Should trust my instincts but there is no way of knowing
Mike, did anyone mention you have Supernova SN2016iae in the shot ?
Millions of thanks, Kevin.
I was so excited, Trish had to feed me glasses of wine to calm me down and big home-baked celeriac chips for nutrition while I searched for it. I understand that you keep your eye out for these things, but brilliant work finding out about it.
SNR marked, and duly submitted to APOD.
Fat chance with all that blue reflection nonsense from upsilon 4 eridani.
Sheesh that's funny, I actually noted that star and for some reason actually thought in my head, "Huh..looks like a supernova"..and just brushed it off...similar to when I noticed NGC253-dw2, very similar thought and brushed it off. Should trust my instincts but there is no way of knowing
Mike
You've got sharp eyes. And a superb memory! Expecting it to be really faint, I had to look it up, find it was AT2016iae, find the coordinates, plate solve, and there it was. I then checked it against Martin Pugh's 2010 shot, and ... all that work for nothing ... it was bleeding obvious. Stood out like the the famous canine counter-current cooling mechanism.
The only surprise is its very warm colour, which could be because it's against (or obscured by) the warm colour of the galactic centre.
It is increasing in brightness, could get down to about mag14.
The colour does lean to some extinction by dust and gas,siumilar to the sn earlier this year in NGC5128 AKA Cent A.
Nice image.
Cheers
