Hemisphere:  Southern  ·  Constellation: Ophiuchus (Oph)
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LDN 137 and LDN 141, 



    
        

            Jim Thommes
LDN 137 and LDN 141
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LDN 137 and LDN 141

Getting plate-solving status, please wait...
LDN 137 and LDN 141, 



    
        

            Jim Thommes
LDN 137 and LDN 141
Powered byPixInsight

LDN 137 and LDN 141

Technical card

Imaging telescopes or lenses: Takahashi FSQ-106

Imaging cameras: ATIK383L+

Mounts: AVX

Guiding telescopes or lenses: 180 mm Guide Scope

Guiding cameras: ASI 120MM Guide Camera

Software: Aladin Sky Atlas Aladin  ·  Excalibrator  ·  Pixinsight  ·  Main Sequence Software Sequence Generator Pro  ·  PHD2 AutoGuide Software

Filters: Astronomik LRGB 1.25" Type IIc


Dates:June 4, 2019

Frames:
Luminance: 26x780" (5h 38') bin 1x1
RGB: 24x270" (1h 48') bin 2x2

Integration: 7h 26'

Avg. Moon age: 1.14 days

Avg. Moon phase: 1.46%


Basic astrometry details

Astrometry.net job: 4079195

RA center: 16h50m44s.9

DEC center: -15°1445

Pixel scale: 2.689 arcsec/pixel

Orientation: 359.876 degrees

Field radius: 1.214 degrees


Resolution: 2600x1950

Locations: Desert Astronomy Association Observatory Campus, Julian, CA, United States

Data source: Own remote observatory

Remote source: Non-commercial independent facility

Description

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.

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LDN 137 and LDN 141, 



    
        

            Jim Thommes