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IC 417 and NGC 1931 in Auriga



Scope: FSQ-106N refractor at f/5, Location: Blair Valley, Anza Borrego Desert, CA  29 December 2013  Camera: ST8300M

Exposure: 8 x 9 min  (1x1 bin) exposure with UV/IR block, 10 x  12 min (2x2 bin) H-Alpha exposures, 8 x 5 min (2x2 bin) RGB exposures.

Processing: Data Collection -  CCDSoft (as FITs).  Calibrated, stacked (Sigma Combine), L - Ha - RGB channel registration, equalization, central gradient removal - Astroart.  Curves, Levels, L - Ha - RGB combine and finishing  - Photoshop. Final color Calibration with eXcalibrator. This image is UV/IR Block and Ha blend for the Luminance channel and then a LRGB combine with Luminance layering.     Final Image size is approximately 3352x2532 resized to 2400x1800.

North is up in this image. North is up in  NGC 1931 is the small bright nebula in the lower left; the larger nebula in the upper right is IC 417 (also known as Sharpless 234). The field in this image is sometimes called the "Spider and the Fly". Here the spider is IC 417 and the fly is NGC 1931. This field is located in the Constellation of Auriga. IC 417 is known to be a star forming region with embedded star cluster.  Both objects are emission/reflection nebulas. As a size reference, NGC 1931 is about 10 light year across. IC 417 is about 7,500 light years distant from Earth; NGC 1931 is about 7,000 light years distant. An earlier image of IC 417 can be seen here.  Horizontal FOV is 115'


Image center is approximately - Equatorial 2000: RA: 05h 29m 23s Dec: +3429'32" 


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