NGC 4725 in Coma Berenices



Scope: C8 Schmidt Cassigrain at f/6.9,  Blair Valley, Anza Borrego Desert, CA,  15 April 2012, Camera: ST8300M

Exposure: 5 x 8 minutes and  12 x 6 minutes UV/IR Block  (2x2 bin),  and 8 x 3 minutes (3x3 bin) RGB Exposures 

Processing: Images were captured with CCDSoft. Aligned/stacked and dark subtracted in Astroart; Sigma Combine method was used for stacking subs.  All channels were scaled and rough color balanced in Astroart.   Channels were co-registered in Astroart.   Central gradient was removed in Astroart. The UV/IR Block exposures  were used for the main luminance construction.  Level adjustments and curves were used to bring out object features.   LRGB combine was done in Photoshop. Color saturation performed by Luminance Layering and LAB Color Space Curves. The background was gain reduced on the Luminance channel as well as a light noise reduction applied.  Selective sharpening was applied to galaxy features. Final touches and color balance in Photoshop. Final Image size is approximately  1676x1266 (cropped and resized to 1800x1350).

 North is up in this image. In this field are three noticeable galaxies; the large prominent galaxy is NGC4725. NGC4725 is a spiral galaxy that is somewhat unique with a single spiral arm unlike other galaxies with two and more spiral arms. The smaller spiral galaxy in the lower right is NGC 4712. The galaxy in the upper left is NGC 4747. This galaxy has an apparent interaction with NGC 4725 - it has some distortion as well as tidal "tails that are faintly visible that extend to the edge of the image. NGC 4725 and NGC 4747 are approximately 41 million and 56 million light years distant from Earth respectively. NGC 4712 is more distant at about 207 million light years.  This image replaces and earlier image of NGC 4725 that can be seen in the Archives here.  Horizontal FOV is about 44'.

Image center is located approximately - Equatorial 2000: RA: 12h 50m 48s Dec: +2537'32" 


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