Planetary Nebula NGC 246

A Planetary Nebula, NGC 246, in constellation Cetus.

Luminance is mixed from Broad band Luminance and H-alpha. Colors are mixed from narrow band channels,

Natural color composition from the emission of ionized elements, R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15%Hydrogen to compensate otherwise missing H-beta emission. This composition is very close to a visual spectrum.

NGC 246 in HST-palette, (HST=Hubble Space Telescope)

from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.

There was almost no emission in S-II channel.

Technical details:

16" RCOS ja Apogee U9000 camera. 

Lum +H-a, O-III and S-II combo. An Australian remote telescope

4x600s for the Luminance

3x1200s H-alpha

1x1200s O-III

1x1200s S-II

 Dark, Bias and Flat calibrated.

Raw data is shared by Petri Kehusmaa and J-P Metsavainio

Processing workflow:

Image acquisition, MaxiDL v4.xxx

Stacked and calibrated in CCDStack.

Deconvolution with a CCDSharp, 30 iterations, added at 50% weight.

Levels, curves and color combine in PS CS3.