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Ring Nebula M57



Scope: C8 203mm  at f/7.5,  Location: Laguna Mountains, CA  6 June,  2008,   Camera: Artemis285

Exposure: 6 x 8 min H-Alpha (2x2), 10 x 3 min IR Block (1x1 bin), 10 x 1 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, IR Block,  and Color channels were scaled and  color balanced in Astroart.  Channels were co-registered in Astroart.   Luminance construction consisted of the IR Block exposure plus enhancements of M57's outer ring using the H-Alpha exposure.  Curves and Levels applied in Photoshop to the Luminance construction to optimize object features. There is considerable compression of dynamic range to display the weak outer ring and the main area of M57. Final LRGB combine was done in Photoshop using Luminance Layering. H-Alpha was blended into red in the color processing.   A light background noise reduction was applied in PixInsight LE (SBNR) on the luminance construction.  Final Image size is approximately 1392x1040.

North is up in this image. This is a guided image. This image shows the faint outer halo of M57 in H-Alpha light. In addition, the faint spiral galaxy, IC 1296, can be seen in the upper right in this image. M57 is about 2,300 light years distant from Earth  This image replaces the July 2004 image which can be seen in the Archives here. Horizontal FOV is 20'.

Image center is located approximately - Equatorial 2000: RA: 18h 53m 36.0s Dec: +3302'00"


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

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