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NGC 7790, 7788, Sharpless 168, 169 in Cassiopeia



Scope: Explore Scientific MN152 Maksutov Newtonian at f/4.8, Location:  DAA Observatory, Shelter Valley CA,  September 16 2017  Camera: ST8300M (Baader Ha LRGB filters)

Exposure: 14 x 7 min  (1x1 bin) exposure with UV/IR block, 10 x 10 min (2x2 bin) Ha exposure, 8 x 4 min (2x2 bin) RGB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Calibrated, stacked (Kappa Sigma Combine) - Deep Sky Stacker. LRGB channel registration, equalization, and gradient removal - Astroart.  Curves, Levels, RGB combine - ImagesPlus. Luminance Layering, final stretch, and finishing  - Photoshop.  RGB calibration - eXcalibrator. This image is a  RGB combine with Luminance layering.  Color saturation in LAB color.  The H-Alpha filter exposure was screen blended into the IR/UV Blocking filter exposure stack and used for the luminance layer. Images processed at 3352 x 2532 resolution. Final Image size is approximately  2600 x 1950.

North is to the right in this image.  NGC 7790 is the star cluster in the uppermost right; NGC 7788  is just below and further right. There are two other open clusters in this field - Berkeley 53 and [KPS2012] MWSC 3783. In the lower left  are two Sharpless object -168 and 169. Sharpless 168 is by far the brightest whereas Sharpless 169 is almost not seen in this exposure depth. There are also several  dark nebulae in this field catalogued in the Lynds Dark, TGU and Dobashi catalogs. These objects as well as a few of the bright stars can be seen in the annotated image.  This image replaces and earlier image that can be seen in the Archives here. Horizontal FOV is 88'



All images and content remain the property of Jim Thommes - copyright 2003 - 2017

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