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NGC2237 (Rosette N), Monoceros in the 100Oiii, 70Ha+30Oiii, 40Sii+60Ha Palette

Astrophotography CCD CMOS DSLR DSO Imaging Orion Refractor
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#1 rekokich

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Posted 03 March 2021 - 03:16 PM

NGC2237 (Rosette N), Monoceros in the 100Oiii, 70Ha+30Oiii, 40Sii+60Ha Palette
 
Rosette Nebula is a spherical region of ionized hydrogen located within an extensive molecular cloud in the constellation of Monoceros. The nebula is a rich stellar nursery, and contains about 2,500 young stars including massive type O stars HD 46223 and HD 46150. Strong stellar wind from these very hot stars is blowing away gas and the dust giving the nebula the appearance of a bubble. Powerful ultraviolet radiation and stellar wind shock waves cause plasma temperatures in the inner parts of the nebula to rise to between 1 and 10 million degrees. In contrast, plasma temperature in ionized hydrogen regions in general averages around 10,000 K. The open cluster NGC2244 has arisen from the nebulosity, and is located near the center. Rosette Nebula is situated at the distance of 5,200 LY, and is approximately 130 LY in diameter Open cluster NGC2252 is found at the NE fringe of the nebula, but lies in the foreground at approximate distance of 2900 LY.

Image details:
-TSapo65q astrograph, 65x420mm
-Modified Canon T3i camera, Astro-Duo filter
-iEQ30pro mount, Orion 60mm f4 SSAGpro autoguider
-12x240 sec subs, iso3200, 30 darks, 30 bias
-Color channels extracted and reprocessed in the 100Oiii, 70Ha+30Oiii, 40Sii+60Ha palette
-Software: PHD2, DSS, XnView, StarNet++, StarTools v 1.3 and 1.7

 

Thank you for looking. C&C welcome.

 

z3LGS.jpg


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#2 rekokich

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Posted 03 March 2021 - 09:01 PM

NGC2237, NGC2244 Mono 20190204-E5LGS TS 65-420 12x240''-3600-m-AD-36F.jpg


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#3 ramdom

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Posted 04 March 2021 - 03:38 AM

I like them both and I love the colours - I generally like it when people go off the beaten path for these images, so I prefer new looks, etc. The first image looks so surreal, like something from Doctor Who ....



#4 james7ca

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Posted 04 March 2021 - 06:02 AM

You've captured a lot of detail for only 48 minutes of total integration time (12 x 4m). Even more so since you shot at f/6.5 with a duo-band filter on a one-shot-color camera. That said, IMO the background is a little dark (measuring a nearly flat 8 out of 255 in a Photoshop histogram). However, sky brightness is a personal choice and it's an effective presentation so job well done.



#5 rekokich

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Posted 04 March 2021 - 02:48 PM

ramdom and james7ca,

 

Thank you for your comments.

 

For some reason, images posted on CN always have less gamma than the original images on my monitor. The sky looks darker; the stars are less bright. Downsampling must be a factor, but there might be other issues.

 

The last version of StarTools has an option in the color module to convert an image to many different palettes. Usually the results are unimpressive. Occasionally they are spectacular. The image certainly looks more interesting than the original red-orange-yellow. I wonder how the colors would compare to a true three narrow-band image. In the end, I regard the result as artificial and "prettyfied" rather than scientific, which is the case with virtually all types of post-processing.

 

The monochrome image is just a desaturated color image. I still like those as much as color, if not even more.




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Also tagged with one or more of these keywords: Astrophotography, CCD, CMOS, DSLR, DSO, Imaging, Orion, Refractor



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