NGC 4631 in Canes Venatici


Scope: Megrez II f/4.1; Location: Dos Picos Park, Ramona, CA;  9 Apr. 2005; Camera: ToUcam SC3

Exposure: 20 x 50 sec  and 16 x 16 sec Luminance exposures with IR Block Filter; 12 x 42 sec RGB 

Processing: Images were captured in K3CCDTools 2. Aligned/stacked in Registax 3 and saved as FITS. Luminance and Color channels were scaled and rough color balanced in IRIS. Channels were co-registered in IRIS.   LRGB Channels were resized to 800x600 prior to LRGB combine. Richardson-Lucy deconvolution was applied to the luminance channel prior to LRGB combine (4 iterations). Luminance and Color FITS were combined in Photoshop with Luminance Layering. Color balancing and final touches in Photoshop including background noise subtraction and blue halo subtraction.  SGBNR  (PixInsight LE) was used to smooth background noise on the luminance channel and remaining background noise on the final result.  Final size  approximately 800x600.

This image was a guided image. North is up in this image. There are 4 galactic objects in this image - two are predominant. In the upper right is NGC 4631 popularly known as the Whale Galaxy with a close neighbor NGC 4627.  In the lower left is NGC 4656 and NGC 4657 - together they form what is popularly known as the Crowbar Galaxy. These objects are in Canes Venatici near the Coma Berenices border. Horizontal FOV is about 50'.  

Image center coordinates are approximately Equatorial 2000: RA: 12h 43m 11s Dec: +3221'19"


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