Messier 3

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Location / Date

Zellerndorf, May 2019

Telescope / Mount / Guiding

ASA 10" Astrograph, ASA 3" Wynne-Corrector (focal length 910mm)
ASA DDM60, no Guiding

Camera / Exposure

Moravian G3-16200, Astrodon filters

L 36 x 6min, R 10 x 6min, G 14 x 6min, B 12 x 6min

Total exposure time: 7h 12min


PixInsight, Fitswork, Photoshop


Messier 3 (M3 or NGC 5272) is a globular cluster of stars in the constellation Canes Venatici. This cluster is one of the largest and brightest, and is made up of around 500,000 stars. It is estimated to be 8 billion years old. It is located at a distance of about 34,000 light-years away from Earth.

It contains by far the highest number of variable stars found in any globular cluster.

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