Southern Pinwheel Galaxy - M83



Scope: C8 f/8; Location: Dos Picos Park - Ramona, CA; 29 May. 2006; Camera: Artemis285

Exposure: 10 x 300 sec  Luminance exposures with IR Block Filter (bin 1x1); 8 x 120 sec RGB (bin 2x2) 

Processing: Images were captured in Artemis Capture (as FITs). Aligned/stacked in Registax 3 and saved as FITS. Luminance and Color channels were numerically scaled and  color balanced in Astroart.  Channels were co-registered in Astroart.  Central Gradient was removed in Astroart using a generated Flat. Curves and Levels applied in Photoshop to optimize object features.  Final LRGB combine was done in Photoshop using Luminance Layering (or LLRGB).  G2V color calibration factors as well as Atmospheric Extinction factors were applied to the color channels for color correction.  Selective sharpening with layer mask was applied to galaxy the dust lanes and spiral arms.  Color balancing and final touches were done in Photoshop. SGBNR was used to smooth  background noise on the  luminance construction and the final result. Final Image size is approximately 1392x1040.

This image was a guided image. North is up. This image replaces an earlier image that can be seen in the Archives here. M83 is well known object  in the constellation of Hydra right on the border with Centaurus. It is also known as the Southern Pinwheel Galaxy. It is about 15 million light years distant from Earth. M83 is an intermediate class galaxy between a normal spiral and a barred spiral galaxy. Two faint galaxies PGC48132 and PGC724525 can be seen as small patches just to the left of M83. Horizontal FOV is about 20'

Image Center is approximately Equatorial 2000: RA: 13h 37m 00s Dec: -2952'02"


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