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Saturday, September 11, 2010

NGC 253, the "Silver Dollar" galaxy

A spiral galaxy in constellation Sculptor.

This galaxy is undergoing a period of intense star formation. Areas with a Blueish hue, are most active regions of the star formation. This is a nearby galaxy, distance is "only"  about 11 million light years.
Largish target, apparent dimensions are, 27,5' x 6,8'. Longer axis is almost as wide as a full Moon (30')

A closeup to show the actual resolution. Note. there is hundreds of dim background galaxies in the image.

Technical details:

16" RCOS ja Apogee U9000 camera. 
LRGB combo. An Australian remote telescope
14x600s for the Luminance and 2x600s / RGB-channel . Dark, Bias and Flat calibrated.
Raw data is shared by Petri Kehusmaa and J-P Metsavainio

Processing workflow:
Image acquisition, MaxiDL
Stacked and calibrated in CCDStack.
Deconvolution with a CCDSharp, 30 iterations.
Levels, curves and color combine in PS CS3.

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