SH2-254 thru SH2-258 in Orion
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Scope: C8 at f/4.7, Location: Blair Valley, Anza Borrego Desert, CA 18 November 2006, Camera: Artemis285
Exposure: 7 x 320 sec H-Alpha (1x1), 6 x 120 sec RGB Exposures (2x2).
Processing: Images were captured with Artemis Capture (as FITs). Aligned/stacked in Registax 3 and saved as FITS. Luminance, H-Alpha, IR/UV Block, and Color channels were scaled and color balanced in Astroart. Channels were co-registered in Astroart. Central Gradient removal was done in Astroart. Curves and Levels applied in Photoshop to the HA Exposure to optimize object features. Luminance construction consisted of the H-Alpha exposure alone. Final LRGB combine was done in Photoshop using Luminance Layering (or LLRGB) - G2V calibration factors were applied. The extracted nebula portion of the HA exposure (stars removed) was 12% subtracted from green and blue channels to correct LLRGB red color shift. Photoshop Surface blur was lightly applied on the Luminance construction. Slight selective sharpening was applied to nebula regions. Final Image size is approximately 1392x1040.
All exposures in this image were guided; North is up in this image. This region contains 5 objects of the Sharpless Catalogue. The two brighter objects of similar size in the image center are from left to right Sh2-255 and Sh2-257; Sh2-255 is also cataloged as IC 2162. To the immediate lower right of Sh2-257 is the small Sh2-256. The large dim object to the right of Sh2-257 is Sh2-254. The very small and faint Sh2-258 is located to the lower left of SH2-255 (IC 2162). This region is located in the constellation of Orion. The Horizontal FOV is 40'.
Image center is located approximately - Equatorial 2000: RA: 06h 12m 44s Dec: +17°59'15"
All images and content remain the property of Jim Thommes - copyright 2003 - 2012
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