M 51, also known as the Tourbillon galaxy (Whirlpool Galaxy in English) is a couple of galaxies located around 27.4 million light years in the constellation of Hunting dogs.
This famous couple is composed of a regular spiral galaxy massive whose diameter is estimated at 100 000 light years and a small irregular galaxy .
Spring star, it is one of the most famous galaxies of astrophotographers, with very pronounced colors and presenting beautiful nebulae, accentuated here by the joint use of a Halpha Hydrogen filter.
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ARTICLES
- General : definition of the different types of celestial objects imaged by deep sky astrophotographers
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- The Messier catalog by 135 astrophotographers
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- The Caldwell Catalog by 141 astrophotographers
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- The Van den Bergh Catalog by 85 astrophotographers
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​​- Le catalogue de Messier par135 astrophotographes
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- Le catalogue de Van den Bergh par 85 astrophotographes
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