The Great Globular Cluster in Hercules

25,002.500,00 (IVA tax inc.)


M13, the Great Globular Cluster in Hercules, is an amazing spherical collection of stars tightly bound by gravity, which gives it this great density of stars. Several hundred thousand stars can be found in one of the most impressive clusters as seen from Earth.

Located some 22,000 light-years away from us in the Hercules constellation, this globular cluster is about 145 light-years in diameter.

Even though this object is quite far away from the Milky Way galactic plane, I captured more than 15h of images using the Ha filter in order to see if I was able to capture some faint and elusive Galactic Cirri. I did not succeed on this search, discarting the 15h55min Ha image. I finally stuck with a classical LRGB image.

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​ HD image.

Support my work. If you want to help me continue with my work, please feel free to buy, just for a few pennies, one or several of my images. The price does not reflect the amount of effort involved in each one of the images. Some of them implied weeks, months and even years of hard work. With your purchase I will be able to continue capturing photons of our amazing universe.

The watermark, with the author’s original credit, cannot be removed in any of the uses. For a commercial use without this watermark please contact me for a detailed budget.

All images, videos and content of this website are copyrighted © Aleix Roig Mateu.

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Image Details

L: 70×120″

RGB: 35×120″ each channel

Hα: 24×300″


All images at 120Gain -15ºC bin2

Calibrated with 50 flats, 50 darks, 50 bias


Total exposure: 5h50’


Average darkness: 20.80 mag/arcsec2

Image resolution: 2.12”/pixel


FSQ85ED telescope

Mesu200 mount

ASI294MM Pro camera with ZWO EFW 8 pos

Guiding with ASI174MC and ZWO OAG

Baader filters



Aleix Roig – Prades, Tarragona (Catalonia, Spain), April 2021.

Additional information

Image use

Non-commercial use, Commercial Use