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Thread: M27 through moonlight & light pollution

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    Default M27 through moonlight & light pollution



    I was outside in the yard fixing the collimation of my C11 last night. My trip to the mountains last week might have knocked a few things around in there. I got the collimation absolutely superb, and the seeing was above average for our area, so I decided to image M27. Now this image was basically a challenge to see how good of an image I could get from a light polluted (red zone) back yard with the moon 75% illuminated. Poor conditions to say the least. There were patchy clouds going over all night, too. So I was limited to short subs, and removing all those gradients was real fun (NOT) this morning. But I am happy with the result, which makes up in sharpness what it lacks in depth.

    I can't wait to do a proper session on M27 from one of my good dark sites later this summer. It will be interesting to compare the two results. I think it will show the value of a good dark site. With 11" of aperture and long subs, I ought to be able to capture the outer halo pretty well. It will be nice to process something where I don't need to clip out the sky background so aggressively.

    Clickable link goes to Astrobin.

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    Default Re: M27 through moonlight & light pollution

    Wow! A beautiful image of M27. I can't wait to see what you can do with this target with a dark sky. Nice!
    Bryan

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    Default Re: M27 through moonlight & light pollution

    Even with the unfavorable conditions you have produced a very nice M27. Your large aperture produces a real nice close up. Nice job on the processing, because, the light pollution is not evident to me at all.
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    Default Re: M27 through moonlight & light pollution

    Awesome!! Great details and colors! Thanks for sharing.
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    Default Re: M27 through moonlight & light pollution

    A stunning M27, very impressive!

    Thanks for posting.
    Lea

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    Default Re: M27 through moonlight & light pollution

    Love it.
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    Default Re: M27 through moonlight & light pollution

    Fantastic color and detail.
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    Default Re: M27 through moonlight & light pollution

    Great image of M27! Very nice indeed. Thanks for sharing and keep up the good work. Clear skies.
    Susan
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    Default Re: M27 through moonlight & light pollution

    Now that's a lovely image and the larger astrobin image is freaking awesome.....and a test run too, jheeeze man!. Seems that your collimation is spot on, and you did a great job with the processing so, congrats buddy!. What were the details for the image i.e exposure and so on?

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    Default Re: M27 through moonlight & light pollution

    The total integration is only two hours, believe it or not. Exposures were 1, 2, and 3 minutes long, oversampled at 0.55" per pixel 1x1 binning). The short exposures were just enough for the sky noise to overwhelm the read noise of the camera. I would probably do 15 minute subs at this image scale out at my dark site, but you have to go really short when the sky noise is so high.

    The seeing was great, and so was the collimation of my scope. TheSkyX says my star FWHM was something like 1.75". I have never seen a number that low previously. There was no wind whatsoever that night, which is a real rarity for west Texas. Transparency was poor, with high clouds and haze going over, but I just ignored it and kept shooting.
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