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LDN 137 and LDN 141



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: -1515'04"


All images and content remain the property of Jim Thommes - copyright 2003 - 2019

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