Contains:M 13, Great Cluster in Hercules, NGC 6205
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M13 with alt-az mount ( NGC6205 ), 


        Michele Vonci
M13 with alt-az mount ( NGC6205 )

M13 with alt-az mount ( NGC6205 )

Technical card

Resolution: 4224x2816

Dates: April 14, 2018

Frames: 110x30" ISO800

Integration: 0.9 hours

Darks: ~20

Flats: ~40

Bias: ~50

Avg. Moon age: 27.91 days

Avg. Moon phase: 2.96%

Bortle Dark-Sky Scale: 7.00

Temperature: 11.00 job: 2013446

RA center: 250.404 degrees

DEC center: 36.468 degrees

Pixel scale: 0.687 arcsec/pixel

Orientation: 50.041 degrees

Field radius: 0.484 degrees

Locations: Home backyard, Stockport, Cheshire, United Kingdom

Data source: Backyard


Last Saturday, after a long time, there was finally a clear night over Manchester! I decided to image the Great Globular Cluster in Hercules, M13.
I managed to collect 1 hour and a half of 30s light frames at 800 ISO, that's my usual setup to avoid excessive field rotation due to the alt-az mount, luckily around 10pm the position of M13 is mainly east, so not too bad in terms of field rotation.
I had to discard 30% of frames because of bad tracking/wind/whatever else, so I ended up with around one hour exposure.
From one end I'm quite pleased by the roundness of the cluster stars, I was worried that field rotation would ruin everything, on the other hand I'm a bit disappointed...I would expect a bit "more" stars, the image is a bit "dark", but I guess the relatively long focal ratio f/6.3, the short collection time and light pollution all play a role here.



Michele Vonci
License: None (All rights reserved)


  • M13 with alt-az mount ( NGC6205 ), 


        Michele Vonci
  • Final
    M13 with alt-az mount ( NGC6205 ), 


        Michele Vonci


Wider field version.

Sky plot

Sky plot


M13 with alt-az mount ( NGC6205 ), 


        Michele Vonci

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UK Astro-Imaging