LDN 137 and LDN 141
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CLICK ON IMAGE FOR FULL SIZE VIEW (2600x1950) Scope: FSQ-106N at f/5, Location: DAA Observatory, Shelter Valley, CA, 29 May and 4 June 2019, Camera: Atik 383L (Astronomik Gen 2 LRGB Filters) Exposure:
Exposure: 26 x 13min (1x1 bin) exposure with UV/IR block filter, 8 x
4.5 min (2x2 bin) each RGB
exposures.
Processing: Data
Collection - Sequence Generator Pro (as FITs). Exposure calibration,
LRGB registration, and stacking (Median combine - Winsorized Sigma
Clipping) - PixInsight. LRGB channel registration, equalization and
gradient removal - PixInsight. Curves, Levels, RGB combine, Luminance
layering - PixInsight. Final finishing - Photoshop. RGB calibration
- eXcalibrator. Annotation - PixInsight, Aladin (Simbad and NED), and PhotoShop. This image is a RGB combine with
Luminance layering. Images processed at 3354 x 2529 resolution. Final
Image size is approximately 2600x1950. North is up in this image. The
large dark nebula in the center is LDN 137. Embedded in (or foreground to)
LDN137 is the smaller and denser LDN 141. The less dense LDN 152 is at the top
of the image. There are other dark structures throughout this image. I have
annotated some of the more prominent dark structures with references to the
Dobashi Catalog of Dark Nebulae and the PGCC. There
are background galaxies in this field - the annotated
images shows some of these. Two of the more predominant background galaxies
(LEDA 917034 and LEDA 919715) are members of the galaxy group [CHM2007] 1223 -
at about 350 million light years distant. These objects and some
of the brighter stars are identified in the annotated
image. Horizontal FOV is approximately 120 arc minutes. Full size
image scale is 2.77 arcsec/pix. Image center is approximately - Equatorial 2000: RA: 16h 50m 51s Dec: -15°15'04"
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