Messier 51

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Ian Papworth
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Messier 51

Post by Ian Papworth »

This is my first attempt to image Messier 51 with the ASI120mm, this is the result of stacking 300 subs of 10 secs each in Deep Sky Stacker and then processing in CS2.

Image
Skywatcher 150p on EQ3-2 pro synscan mount
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brian livesey
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Re: Messier 51

Post by brian livesey »

That's a nice image Ian of this duo of spirals. The smaller member looks to be strongly barred.
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gadieid
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Re: Messier 51

Post by gadieid »

M51 is one of the favorites. Your result is very good but I wonder why you limited yourself to 10sec. Is it due to light pollution? A bit larger exposures would give more details.
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Ian Papworth
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Re: Messier 51

Post by Ian Papworth »

I have an altazimuth mount so with field rotation I dare not push the exposure lengths. My next purchase will be an EQ mount, but for now I am limited. Thanks for your kind words.
Skywatcher 150p on EQ3-2 pro synscan mount
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Ian Papworth
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Re: Messier 51

Post by Ian Papworth »

I have just done some further processing of the M51 image I captured on the 26th Dec to try and bring out more detail.

Image
Skywatcher 150p on EQ3-2 pro synscan mount
Altair Hypercam 183c pro

http://www.astrobin.com/users/IanPapworth/
Brian
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Re: Messier 51

Post by Brian »

I think that worked! 8)
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Re: Messier 51

Post by smerral »

Nice one! :D
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Ian Papworth
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Re: Messier 51

Post by Ian Papworth »

Here is another attempt of mine to image M51, 10 sec exposures stacked and processed. I have been trying to Bin 2 x 2 but it does not seem to be as successful as Deep Sky stacker is struggling to pick out enough stars to stack the images, this image is done without 2 x 2 bin and seems to be better, I take it the resolution and quality of binning 2 x 2 is lower, the image also appears to be reduced in size.

Has anyone got any tips on binning?, or is it better with the ASI120mm to capture normally so as to not reduce the chips sensitivity. I am also not sure what you are saving with binning as opposed to capturing images without it.

Image
Skywatcher 150p on EQ3-2 pro synscan mount
Altair Hypercam 183c pro

http://www.astrobin.com/users/IanPapworth/
brian livesey
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Re: Messier 51

Post by brian livesey »

The bridge of matter that appears to join the two galaxies is fairly obvious in this image.
Is the bridge an actual feature of gravitational tidal action between these objects, or only a line-of-sight effect?
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Ian Papworth
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Re: Messier 51

Post by Ian Papworth »

Just downloaded a Photoshop plug in recommended by Prof Ian Morison at the SPA meeting in London today, I have managed to remove the annoying green tinge to my M51 image with "hasta la vista green", which is a free download.

Image
Skywatcher 150p on EQ3-2 pro synscan mount
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smerral
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Re: Messier 51

Post by smerral »

I have been trying to Bin 2 x 2 but it does not seem to be as successful as Deep Sky stacker is struggling to pick out enough stars to stack the images,
Which is precisely why I abandoned DSS for Nebulosity.

As for binning, I find it helps to reduce exposure time for my colour images as the filters dim the image. I wouldn't use it for luminance though. Yes the binned images will be half the size and need to be re-sized before combining with the luminance.

Yes HLVG is a great little plugin - I often use it. :D
BRIAN
Celestron Nexstar 8SE, Ioptron CEM 25P mount
Altair Astro 102 ED refractor with Lunt B600 CaK diagonal
Coronado PST DS, Daystar Quark
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Ian Papworth
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Re: Messier 51

Post by Ian Papworth »

I have downloaded nebulosity in trial mode so I can give it a look with a view to purchasing the full program if I get on with it. I do get frustrated when I can clearly see stars on my images and DSS fails to pick them up and promptly tells me it is only going to stack just one image. I take it nebulosity is fairly easy to get to grips with.

here is another play at processing my recent M51 image.

Image
Skywatcher 150p on EQ3-2 pro synscan mount
Altair Hypercam 183c pro

http://www.astrobin.com/users/IanPapworth/
smerral
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Re: Messier 51

Post by smerral »

Nebulosity seems more complicated at first glance Ian but once you get the hang of it is superior to DSS in my view and gives better results. Here's a useful tutorial.

https://www.youtube.com/watch?v=OMhLYg-xPuc
BRIAN
Celestron Nexstar 8SE, Ioptron CEM 25P mount
Altair Astro 102 ED refractor with Lunt B600 CaK diagonal
Coronado PST DS, Daystar Quark
ZWO ASI120MM camera, Canon 1000D (astro modified), Starlight Express SXV H9-C.
Gallery: http://www.astrobin.com/users/smerral/
Vega
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Re: Messier 51

Post by Vega »

This proves how important post-processing can be. A great result!
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