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LDN 1251, 1247 in Cepheus



Scope: FSQ-106N at f/5, Location:  DAA Observatory, Shelter Valley CA,   16 September 2017  Camera: Atik 383 (Astronomik Gen II  LRGB filters)

Exposure: Exposure: 16 x 10 min, (1x1 bin) exposure with UV/IR block,  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 and equalization, rough color calibration, gradient removal - Astroart.  Curves, Levels, RGB combine - ImagesPlus, Luminance layering and finishing  - Photoshop. This image is an LRGB combine with Luminance layering. Final color calibration - eXcalibrator. The Luminance construction was the Luminance exposures. Color saturation in LAB color.    Native image size - 3354x2529.  Final Image size is approximately 2600x1950.

North is up in this image.  LBN  558 is the over arching object in this field (by size). This is an extended cloud of gas and dust that is considered a low mass star forming region. Incorporated within and around are dark nebulae from Lynds Dark Nebula (LBN), Dobashi, and TGU catalogs. Notably seen are LDN 1247 and 1251, Dobashi 3533, 3535, 3537, 3539, 3553, 3555, and 3556. There are also two background galaxies that can easily be seen in this field - PGC 069472 and LEDA 166755. These objects  and some of the bright stars are identified in the annotated image. This image replaces an earlier image in the Archives here  Horizontal FOV is 120'

Image center is approximately - Equatorial 2000: RA: 22h 31m 36s Dec: +7510'31"


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