Barnard 169 and 170
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CLICK ON IMAGE FOR FULL SIZE VIEW (3800x2877) 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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