Rosette
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Scope: ZenithStar 66 at f/4.5,  Location: Blair Valley, Anza Borrego Desert, CA  27 December 2008, Camera: Artemis285

Exposure: 10 x 8 min H-Alpha (1x1),  8 x 2 min RGB Exposures (2x2).

Processing: Images were captured  with Artemis Capture (as FITs).  Aligned/stacked and dark subtracted in Astroart with Sigma Combine.   H-Alpha  and Color channels were scaled and  color balanced in Astroart.  Channels were co-registered in Astroart.   Luminance construction consisted of the H-Alpha exposure.  Curves and Levels applied in Photoshop to the Luminance construction to optimize object features.  Final LRGB combine was done in Photoshop using Luminance Layering in LAB color Space.   A color adjustment was made at low signal levels to attenuate blue and green and amplify red. Also, green and blue channel's highlights were  increased. All color adjustments were made with a star mask (i.e. to nebula areas only). A light sharpening was applied with star mask. Final Image size is approximately 1392x1040.

All exposures in this image were guided; North is up in this image. This is an extended cloud of gas and dust popularly known as the "Rosette Nebula". Within its center is the star cluster cataloged as NGC2244. Various parts of this cloud are designated NGC2237, 2238, 2239, and 2246. In the sky it is a large structure as viewed from the Earth with a diameter of about 5 full moons. It is a distance of about 5,500 light years from Earth. This image replaces an earlier image that can be seen in the Archives here.  The Horizontal FOV is 105'.

Image center is located approximately - Equatorial 2000: RA: 06h 32m 05s Dec: +0456'28"

 

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