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NGC 6871, NGC 6883, Biurakan 1 +2 and Ruprecht 172 - open
star clusters in the constellation Cygnus |
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Short objekt description:
NGC 6871 is an open star
cluster in the constellation Swan. Together with NGC
6883 and some exotic star clusters like Biurakan 1
and Biurakan 2 they are embedded in the large H-II region
GN 20.07.1.02. The star clusters are located in
the middle of the Milky Way in the constellation Swan and are almost lost in
the many surrounding field stars.
NGC
6871
NGC 6871 contains nearly 50 stars and is classified as
type IV 3 p n according to Trumpler. Its distance
to the solar system is given as about 5000 light years and the age of the
cluster as just under 10 million years. NGC 6871 was discovered by Friedrich
Wilhelm Herschel on 23 September 1783. |
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NGC 6883
NGC 6883
contains almost 30 stars and is classified as type I 3 p
n according to Trumpler. The star cluster was discovered by John
Herschel on 19 August 1828.
Biurakan 1,
Biurakan 2 and Ruprecht 172
The information about these two
star clusters is very uncertain. Biurakan 1 is classified as
type IV 3 p n according to Trumpler. Its distance
from the solar system is given as about 1600 light-years and the age of the
cluster as just under 18 million years. For Biurakan 2, the following
information is available: Trumpler type III 2 p n,
distance about 1100 light years and age of the stars about 11 million years. No
further information is available for Ruprecht
172.
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by Franz Hofmann + Wolfgang Paech |