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Messier 52 M52 NGC 7654 Cassiopeia

astrophotography ccd Celestron CMOS dslr dso imaging Orion optics refractor
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#1 rekokich

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Posted 29 November 2017 - 08:00 PM

Messier 52 M52 NGC 7654 Cassiopeia

M52 (NGC 7654) is a bright open cluster in Cassiopeia, 35 million years old, containing approximately 193 members, discovered by Charles Messier on September 7, 1774. While the brightest member has apparent magnitude of 11, the combined visual magnitude of the cluster is 7.3, easily identified with binoculars.Due to extinction of starlight by interstellar gas and dust, which reduces apparent magnitude to an uncertain degree, the distance to the cluster is imprecisely estimated between 3,000 and 7,000 LY. Assuming the median distance of 5,000 LY, and given the apparent diameter of 13 arcmin, the cluster is approximately 19 LY across, or 3591 cubic LY in volume, with average distance between member stars of 2.65 LY.

The image was taken with the small TSAPO65Q astrograph, modified Canon T3i camera, Astronomik CLS-CCD filter, Celestron AVX mount, and Orion 60mm F4 SSAG pro autoguider. It is a stack of 6 x 300 sec exposures, iso 1600, 30 darks, 30 bias, 2x drizzle, 20% crop. Software used was PHD2, DSS, Xn View, StarTools, and Neat Image. Limiting magnitude is 16.5. The faint red glow in the SW corner of the attached photo is the outer limit of emission nebula NGC 7635 (Bubble Nebula).

Thank you for looking.

.M52 NGC7654 Cass 2171116-EL TS 65x420mm 2x 6x300''-1600-cls-M-37F.jpg


  • SolidAhmed, eros312, skywatcher3000 and 6 others like this

#2 ccmdfd

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Posted 29 November 2017 - 08:33 PM

Nice!

I love open clusters.

cc

#3 Heitman

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Posted 29 November 2017 - 10:00 PM

Very nice! 



#4 DaveB

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Posted 29 November 2017 - 11:16 PM

Nice. This looks like it is NOT a crop of your other photo (with the Bubble Nebula), correct? The stars in the cluster look sharper on this image than the one with the Bubble.



#5 rekokich

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Posted 30 November 2017 - 05:58 AM

Yes, I also love open clusters. They are beautifu and easy targets for small telescopes both visually and photographically.

 

Dave, this image is a stack of only CLS-CCD filter exposures at iso 1600. The Bubble photo has an Ha stack at iso 3200 layered on top of this stack, so it is bound to have more noise to begin with. Then, the Bubble photo required much more stretching to bring out the emission nebula, which further increased the noise. On original images the nebula was barely visible. I suppose I should have done much longer Ha exposures at lower iso, but the computer battery was running low, and I was really freezing.




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