Imaging conditions
First SHO session using the FlatField and the Atik383L.
One hour Ha, one hour OIII, 45min SII, under heavy city light pollution and full moon.
Process description
I has some issues with cold pixel during staking under PI while calibrating the data. There are some remaining at full res view I can't get rid off "_
Here is shown the image resulting from SHO data mapped to get a pseudo true color render.
The processed [Ha version](
http://www.astrobin.com/34590/B) was used as luminance. The RGB data was mapped as follow:
R: 80%Ha + 20%SII
G: 100%OIII
B: 85%OIII + 15%Ha
Histogram balance and color saturation were finally applied to the LRGB mix.
The OIII and SII data is very weak (the aquisition session lasted only 3.5 hour, with sub exposures of 7min each), which explains the lack of green and blue in the image.
The stars have not been treated separately.
Object description
Wikipedia The Rosette Nebula (also known as Caldwell 49) is a large, circular H II region located near one end of a giant molecular cloud in the Monoceros region of the Milky Way Galaxy. The open cluster NGC 2244 (Caldwell 50) is closely associated with the nebulosity, the stars of the cluster having been formed from the nebula's matter. The cluster and nebula lie at a distance of some 5,200 light-years from Earth (although estimates of the distance vary considerably, down to 4,900 light-years.[3]) and measure roughly 130 light years in diameter. The radiation from the young stars excite the atoms in the nebula, causing them to emit radiation themselves producing the emission nebula we see. The mass of the nebula is estimated to be around 10,000 solar masses.
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