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Hemisphere:  Northern  ·  Contains:  IC 1170, IC 1178, IC 1181, IC 1182, IC 1185, NGC 6039, NGC 6040, NGC 6041, NGC 6043, NGC 6044, NGC 6045, NGC 6047, NGC 6050, NGC 6054, NGC 6056
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Hercules Galaxy Cluster from a White Zone, 


            Douglas J Struble
Hercules Galaxy Cluster from a White Zone
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Hercules Galaxy Cluster from a White Zone

Technical card

Imaging telescopes or lenses: Explore Scientific ED165CF FPL-53

Imaging cameras: ZWO ASI1600MM-PRO

Mounts: Astro-Physics Mach 1 GTO

Guiding telescopes or lenses: Orion 80mm Short Tube

Guiding cameras: Starlight Xpress Lodestar x2

Software: PHD2  ·  PixInsight  ·  Photoshop CS5  ·  SkySafari Pro

Filters: Astronomik Deep-Sky G  ·  Astronomik Deep-Sky R  ·  Astronomik Deep-Sky B  ·  Astronomik Luminance (UV/IR Cut) L-1

Accessory: QHYCCD PoleMaster  ·  Hotech 2" SCA Self-Centering Field Flattener  ·  ZWO 8x 1.25" Filter Wheel (EFW)  ·  MoonLite CFL 2.5" Large Format Focuser

Dates:May 29, 2020June 19, 2020June 20, 2020June 24, 2020

Astronomik Deep-Sky B: 198x60" (gain: 0.00) -20C bin 1x1
Astronomik Deep-Sky G: 200x60" (gain: 0.00) -20C
Astronomik Deep-Sky R: 200x60" (gain: 0.00) -20C bin 1x1
Astronomik Luminance (UV/IR Cut) L-1: 1169x60" (gain: 0.00) -20C bin 1x1

Integration: 29.5 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 16.64 days

Avg. Moon phase: 14.66%

Bortle Dark-Sky Scale: 8.00

Basic astrometry details job: 3647014

RA center: 16h 5' 4"

DEC center: +17° 45' 18"

Pixel scale: 0.680 arcsec/pixel

Orientation: 99.807 degrees

Field radius: 0.262 degrees

Resolution: 2153x1747

Locations: Backyard White Zone Observatory, Taylor, MI, Michigan, United States

Data source: Backyard


This is probably my last broadband capture for the season with the Milky Way rising. Broadband here always is rough given my bortle sky scale of 8 about 15 minutes from Detroit, Michigan. I tried my best, though.

The Hercules Cluster (Abell 2151) is a cluster of about 200 galaxies some 500 million light-years distant in the constellation Hercules. It is rich in spiral galaxies and shows many interacting galaxies, which I love to capture. The cluster is part of the larger Hercules Supercluster, which is itself part of the much larger Great Wall super-structure.



Douglas J Struble
License: None (All rights reserved)


  • Hercules Galaxy Cluster from a White Zone, 


            Douglas J Struble
  • Final
    Hercules Galaxy Cluster from a White Zone, 


            Douglas J Struble


Description: Cropped tighter.

Sky plot

Sky plot


Hercules Galaxy Cluster from a White Zone, 


            Douglas J Struble