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Messier 5 - a large globular cluster in the constellation
Snake (Serpens) |
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Object description:
Messier 5 (NGC
5904) is a large globular cluster in the constellation of the Snake (Serpens).
It is just visible to the naked eye under very dark skies. It is assigned to
class V according to Shapley/Hogg, which means
that the stars are very concentrated in the central region. The bright star in
our image is 5 Serpentis.
In this
globular cluster nearly 100 variable stars of the RR Lyrae class were
discovered, so that the distance to the solar system could be determined very
precisely with 24,500 light years. With this distance and its apparent diameter
of about 20 arcminutes M5 fills a volume of nearly 170 lightyears.
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With
an estimated stellar age of 13 billion years, it is one of the oldest globular
clusters in our galaxy's halo. The system probably contains over 100,000 suns.
The globular cluster was discovered by Gottfried and Maria Kirch on May
5, 1702, and included by Charles Messier in his Messier Catalog on May 23,
1764. Gottfried Kirch was a schoolmaster, calendar maker and royal astronomer
in Berlin.
« Click here or the thumbnail to load a large annoted image
and a size comparison to the full moon. |
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All Images and all Content are ©
by Franz Hofmann + Wolfgang Paech |