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NGC 1491 in Perseus

 

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Scope: C8 203mm  at f/4.8,  Location: Dos Picos Park, Ramona, CA  17 November,  2007,   Camera: Artemis285

Exposure: 8 x 10 min H-Alpha (1x1), 6 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 made to correct the color at low RGB signal levels.  A light background noise reduction was applied in PixInsight LE (SBNR)  Selective sharpening was applied to nebula features in Photoshop with a layer mask.  Final Image size is approximately 1040x1392

 North is up in this image. The field in this image is from the constellation of Perseus. The object in this image, NGC 1491, is an  emission nebula. The larger star in the center/left of the nebula's brighter area provides the energy creating the nebula's emission. This image replaces and earlier image that can be seen here. The Horizontal FOV is 32'.

Image center is located approximately - Equatorial 2000: RA: 04h 03m 14s Dec: +5118'58"

 

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

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