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Contains:  M 13, Great Cluster in Hercules, NGC 6205
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M13 Globular Cluster (NGC 6205), 


            Douglas J Struble
M13 Globular Cluster (NGC 6205)

M13 Globular Cluster (NGC 6205)

Technical card

Resolution: 3358x2687

Dates:April 29, 2018April 30, 2018

Astrnomik CLS-CCD: 86x60" -20C bin 1x1
Astrodon Blue Tru-Balance E-Series Gen 2: 59x60" -20C bin 1x1
Astrodon Green Tru-Balance E-Series Gen 2: 60x60" -20C bin 1x1
Astrodon Red Tru-Balance E-Series Gen 2: 60x60" -20C bin 1x1

Integration: 4.4 hours

Darks: ~50

Flats: ~50

Flat darks: ~50

Bias: ~250

Avg. Moon age: 14.73 days

Avg. Moon phase: 99.73%

Bortle Dark-Sky Scale: 6.00 job: 2038717

RA center: 250.428 degrees

DEC center: 36.460 degrees

Pixel scale: 0.649 arcsec/pixel

Orientation: 290.420 degrees

Field radius: 0.388 degrees

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

Data source: Backyard


Why the moon is full and there are no narrowband targets to work on, I decided to go after some globular clusters.

Messier 13 (M13), also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules or the Hercules Globular Cluster, is a globular cluster of about 300,000 stars in the constellation of Hercules.

M13 was discovered by Edmond Halley in 1714, and cataloged by Charles Messier on June 1, 1764. Charles had a list of more than a 100 objects that later became known as the Messier Catalog. The French astronomer mistook these objects for comets, but compiled them into a list to help future scientists.



Douglas J Struble
License: None (All rights reserved)


  • M13 Globular Cluster (NGC 6205), 


            Douglas J Struble
  • Final
    M13 Globular Cluster (NGC 6205), 


            Douglas J Struble

Sky plot

Sky plot


M13 Globular Cluster (NGC 6205), 


            Douglas J Struble