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Barnard 169 and 170



Scope: Explore Scientific MN152 at f/4.8, Location: DAA Observatory, Shelter Valley, CA, 1 and 4 August 2021  Camera: ASI1600M (Astronomik Gen 2  LRGB Filters)

Exposure: Exposure: L - 48 x 5 minutes (gain-1700 1x1) ,  RGB - 20 each x 3 minutes  - (gain-139 1x1).

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Sub-frame calibration - Pixinsight. Sub-frame  registration and integration (Average combine -  Winsorized Sigma Clipping) - PixInsight.  Mure Denoise - PixInsight. Non-linear stretching, normalization and gradient removal - PixInsight. Generation of starless nebulosity image (Luminance) - Star XTerrminator.  Curves, Levels, RGB combine, Luminance layering - PixInsight.  Final finishing  - Affinity Photo.  Photometric RGB calibration - PixInsight. Annotation - PixInsight, Aladin (Simbad and NED), and Affinity Photo. This image is a  LRGB with luminance layering. The monochrome starless was combined with a full monochrome image (one stops down in stretch) to minimize star bloat (using pixel math). Image processed at 4656x3520 resolution. Final Image size is approximately  3800x2850.

North is up in this image.  This image captures Barnard 169 and 170  which  are faintly discernable due to the reduced star field caused by their line of sight obstruction. There is also a lack of foreground stars to help illuminate their obstructing material and surrounding dust. Barnard 169 is the larger structure encompassing much of the image; Barnard 170 is smaller. Also within this structure are several LDN objects - LDN 1139, 1141, 1142, 1143, 1149, 1151, and 1153. Some of the brighter stars in this field  range in distance from 350 to 650  light years. The dust of these dark structures are not reflecting light from these stars - suggesting that these structures my be nearer. These objects, information, and some of these brighter stars are identified in the annotated image. Horizontal FOV is approximately 85 arc minutes. Full size image scale is approximately 1.34 arcsec/pix.. 

Image center is approximately - Equatorial 2000: RA: 21h 58m 12s Dec: +58 46 02"



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