NGC2403 in Camelopardalis
Enhanced Hydrogen Comparison

 

            


            
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This comparison illustrates
            that when the large amount of hydrogen present in this galaxy
            is made more easily visible, the entire galaxy became swamped
            with the pink light of swirling hydrogen clouds. Once again,
            you will easily be able to see that many of the blue stellar
            OB associations present in the arms are intimately connected
            with thier accompanying hydrogen regions. The right side of this
            spiral is so intense with gas, that the entire appearance of
            the galaxies arm is changed.

            
This years rendition
            of this splendid face on spiral in Camelepodarus incorporates
            the latest processing techniques, and plenty more color data
            for a rich and very low noise presentation. NGC2403 is a low
            surface brightness inclined Sc spiral, rated at an integrated
            magnitude of 8.9, which is spread out to a rather thin 25 arcseconds
            in size - about half a degree long here. North is up in this
            view, and the galaxy is inclined about 5 degrees from face on
            for our view from the Earth. Additionally, this galaxy is very
            dust obscured, with a B-V index of.47, meaning it photographs
            as nearly pure yellow. Histogram equalization was able to easily
            correct for this discoloration, presenting the galaxy in a more
            true color appearance.

Instrument:  12.5" f/5 Home made Newtonian
Mount:  Astrophysics 1200 QMD
CCD Camera:  SBIG 10XME NABG with Enhanced Water Cooling
Guider: SBIG ST4  w/Lumicon Newt Easy Guider
Exposure:  LRGB = 80:40:40:40 (RGB Binned 2x2)
Enhanced Image add 2h of Ha data
AstroDon RGB Combine Ratio:  1: 1.05: 1.11
Location:  Payson, Arizona, Elevation:  5150 ft.
Sky:  Seeing FWHM = 4.5 arcsec (Maxim DL - 10min subframe), Transparency 8/10
Outside Temperature:  35 F
CCD Temperature:  -30 C
Image Processing Tools: 
Maxim DL:  Calibration, Deblooming (Starizona Debloomer), aligning, stacking
Gralak's Sigma:  Stacking
PixInsight:  Curves, Deconvolution, noise reduction
Photoshop CS2:  Curves, Color Correction, Gradient removal (Grad Xterminator), Cleanup
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