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M94 in Canes Venatici



Scope: C8 f/8; Location: Laguna Mountains, CA; 20 May. 2006; Camera: Artemis285

Exposure: 9 x 240 sec  Luminance exposures with IR Block Filter (bin 1x1); 6 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  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.

 North is up in this image. M94 is a galaxy located in the constellation of Canes Venatici. It has a bright central region ringed by active star forming regions. The dimmer outer disk is composed of mostly older (yellow/red) stellar population. The distance of M94 to Earth is somewhat of a controversy with estimates ranging from 15 million to 30 million light years.  Horizontal FOV is about 20'

Image Center approximately - Equatorial 2000: RA: 12h 50m 53s Dec: +4107'17"


All images and content remain the property of Jim Thommes - copyright 2003 - 2012

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