Rosette Nebula (as processed on 2016-10-16)

Rosette Nebula (as processed on 2016-10-16)

I used the old raw material as described in this post, but this time I used the new program described here. This is the result.

From wikipedia: The Rosette Nebula (NGC 2237, 2238, 2239, and 2246) is a diffuse nebula in Monoceros. It has an overall magnitude of 6.0 and is 4900 light-years from Earth. The Rosette Nebula, over 100 light-years in diameter, has an associated star cluster and possesses many Bok globules in its dark areas. It was independently discovered in the 1880s by Lewis Swift (early 1880s) and Edward Emerson Barnard (1883) as they hunted for comets.

I also looked up the small open cluster on the lower right of the frame, it is NGC 2236. It is about 9600 light years away, ie about twenty times further than the Pleiades.

Canon 1100D mod, obi de 200mm F/2.8 la F/4, 20×150 sec, ISO 800, EQ3, Dângău Mare, Cluj, 2016-04-03

raw sample

raw sample

First attempt

First attempt

As processed on 2016-10-06

As processed on 2016-10-06

as processed on 2016-10-16

as processed on 2016-10-16

While processing, I had to decide how many stars to keep. Using the frame below which is the output of my scraping program, I made two extremes: where there are almost no stars, but they still look more or less natural, and where I kept all the stars (and used the frame only to fill the panda eyes).

no stars at all

no stars at all

almost no stars (1)

almost no stars (1)

all the stars (2)

all the stars (2)

For the final picture I decided to use the (2) on which I put (1) with an opacity of .82. You might try playing with the sliders below to see whether you agree with my choice.

 
Top (displayed with ... opacity, slide to change): almost no stars
Bottom: all the stars
 

 

 

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