Hemisphere:  Northern  ·  Constellation: Hercules (Her)  ·  Contains:  Great Cluster in Hercules  ·  Hercules globular cluster  ·  IC4617  ·  M 13  ·  M13  ·  NGC 6205
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M13 (Hercules Globular Cluster), 


            Joel Shepherd
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M13 (Hercules Globular Cluster)

Imaging telescopes or lenses: TEC 140 APO FL

Imaging cameras: Atik 460EX Mono

Mounts: Astro-Physics Mach1GTO

Guiding cameras: Lodestar X2

Software: Sequence Generator Pro  ·  PixInsight 1.8

Filters: Baader Planetarium B 1.25"  ·  Baader Planetarium G 1.25"  ·  Baader Planetarium R 1.25"


Dates:June 1, 2019June 10, 2019June 11, 2019

Baader Planetarium B 1.25": 31x180" -10C bin 1x1
Baader Planetarium B 1.25": 7x240" 0C bin 1x1
Baader Planetarium G 1.25": 31x180" -10C bin 1x1
Baader Planetarium G 1.25": 10x240" 0C bin 1x1
Baader Planetarium R 1.25": 28x180" -10C bin 1x1
Baader Planetarium R 1.25": 11x240" 0C bin 1x1

Integration: 6.4 hours

Avg. Moon age: 14.65 days

Avg. Moon phase: 40.52%

Bortle Dark-Sky Scale: 6.00

Astrometry.net job: 2784139

RA center: 16h 41' 40"

DEC center: +36° 28' 3"

Pixel scale: 1.101 arcsec/pixel

Orientation: 73.662 degrees

Field radius: 0.258 degrees

Resolution: 1280x1103

Locations: Home, Seattle, WA, United States

Data source: Backyard


Good ol' Messier 13: a ball of several hundred thousand stars, some of which are as old as 12-13 billion years, located about 22,000 light-years away in the constellation Hercules.

This took a relatively light hand processing-wise: the usual noise reduction and a little bit of unsharp mask, but that's about all. PixInsight's Arcsinh Stretch worked well on both the RGB and synthetic luminance.

Around the time of the summer solstice, Seattle only gets 90 minutes or so of true darkness, so targets have to be bright and/or a number of nights are required to get much usable data. So, M13 is a convenient target for this time of year, though it took three nights to scoop up as much data as one could in one evening in the winter.


Sky plot

Sky plot


M13 (Hercules Globular Cluster), 


            Joel Shepherd