We've grown increasingly fascinated by the relatively faint nebulosity NW of M17.
It is shown superbly in the top 40% of a recent wide field 32 hr SHO image by Suavi.
Here we had a more narrow field view of said patch, and it turns out that the Swan has had a Cygnet, only just emerged from its shell and still all wet and scrawny.
Mum's chest is the very bright patch at the bottom right corner, but she is mostly out of field.
[Edit: the link now points to a slightly less deconvolved and sharpened version than when first posted]
Perhaps one of the cygnet's ancestors was an archaeopteryx, leathery wings held out Cormorant style, still confined by the shape of the egg perhaps. You can see the cygnet's head and long thin neck, and perhaps even some dark legs all dangling down-oh.
The cygnet turns out to be almost as large on the sky as mum. Either it is closer to us, or it was a painful egg-laying.
Aspen CG16M on 20" PlaneWave. 3nM H-alpha. 7 hrs in 1 hr subs.
North is on the right. Field approx 35 min arc. Original image 0.55 sec arc/pixel.
We're in a good mood here at Placidus, because despite the drought, we've got just enough feed to look after 26 yearling heifers for our neighbour for a few weeks, so it's looking all rural out the window, and more rain tonight.
I must admit I compared your data with my recent image of the Swan and it is clear beyond any doubt that in spite of a shorter integration your image reveals much much more and in significantly higher quality. Top shelf image
As for the cows - these peaceful grass grazing machines can certainly add to the charm and tranquillity of a countryside.
Very cool alternate to the usual M17, M&T It did look slightly wormy, so perhaps a little too much decon? I'm sure Mikey will let us know if it sets off his decon alarm
I must admit I compared your data with my recent image of the Swan and it is clear beyond any doubt that in spite of a shorter integration your image reveals much much more and in significantly higher quality. Top shelf image
As for the cows - these peaceful grass grazing machines can certainly add to the charm and tranquillity of a countryside.
Thanks, Suavi. You probably wrote this while we were busy editing our post to include a link to your image, which was the actual inspiration.
We hope to add some OIII and SII before the season is over.
WOW!
I've always liked that bit of M17, somehow the dark dust lane almost disappears in every colour rendition - so seeing it here, proud & bold supported by the plumes of Ha above is wonderful.
WOW!
I've always liked that bit of M17, somehow the dark dust lane almost disappears in every colour rendition - so seeing it here, proud & bold supported by the plumes of Ha above is wonderful.
Thanks muchly, Andy. In that dust there is a row of animal faces all in profile, all facing toward about 4 o'clock: a lion, three kangaroos (or perhaps ferrets?), and a panther smoking a very fat cigar.
Quote:
Originally Posted by Jsmitt94
Stunning as always
Thanks Jacob!
Perhaps the original is very slightly too sharpened. Here is a version with only 2/3 the number of decon rounds, and only half the wavelet sharpening. The bright stuff at bottom right (mummy swan) looks better, but the rest of it is barely changed.
Thanks muchly, Louie. There's plenty to get the imagination going in there.
Quote:
Originally Posted by Lognic04
WOW!!!
I have to ask, how do you not blow out the stars with 1 hour subs?!!
Thanks, Logan.
Part of the trick is the 3nM H-alpha filter only lets through about 1% of the visible light.
Another is that the quantum wells on the 16803 chip are pretty deep. They can register 100,000 photo-electrons.
About 30 of the 8000 or so detectable stars in the image have indeed reached 65535 A/D counts in the exact centre, but each pixel has an anti-blooming gate that stops the full well affecting neighboring pixels. The outer reaches of these 30 or so stars that are burned out in the exact centre are still fine.
The long subs work well. We do enough subs to be able to statistically reject cosmic rays and satellite trails. In the dome, there is no problem with wind buffet up to about 40 KPH. We don't image if my hat won't stay on. We got the polar alignment spot on about 6 years ago and with our 2.5 tonne pier 1.8 metres into solid rock, we haven't had to touch it, so there's no problem with field rotation. As regards to tracking and guiding glitches, the FWHM is no worse after 1 hour than it is after 60 seconds.
We have very dark skies (except near the horizon), and for 3nM H-alpha, such long subs are justified. It is also just plain convenient to only have 6 or 8 subs to analyze.
This is really great guys, bold and contrasty. Love the new presentation of this perennial favourite too, it really is a new nebula when oriented like that and really does look like a young swan flapping it's wings as it is standing up Really looking forward to seeing it in full narrowband now and with M17 cut off the bottom there, should look good in its own right.
The signet is flapping and playing in the hydrogen gas "lakes".
Gorgeous image MnT, the depth and contrast is top shelf
Thanks Colin! We can hear the Tchaikovsky playing in the mist.
Quote:
Originally Posted by strongmanmike
This is really great guys, bold and contrasty. Love the new presentation of this perennial favourite too, it really is a new nebula when oriented like that and really does look like a young swan flapping it's wings as it is standing up Really looking forward to seeing it in full narrowband now and with M17 cut off the bottom there, should look good in its own right.
Mike
Cheers, Mike! Your actual swan has the pose perfectly. Will definitely do lots of OIII and SII. Might need 2x2 binning for those.
Thanks, Suavi. You probably wrote this while we were busy editing our post to include a link to your image, which was the actual inspiration.
We hope to add some OIII and SII before the season is over.
Glad that you liked my attempt at this bright yet challenging to adequately present magnificent dso. I'm am really looking forward to seeing your image that includes OIII and SII.
