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NGC 6200, NGC 6204, Hogg 20, 21 and Hogg 22 - open star
clusters in the constellation Ara - a widefield view |
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Object description:
NGC 6200 is an
open star cluster in the constellation (Ara) Altar and is classified as
type III 2 m according to Trumpler. With an
apparent diameter of just under 15 arcminutes it lies at a distance of about
6700 light-years in the middle of the Ara OB2 star association. It was
discovered by John Herschel on July 1, 1834. |
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NGC 6204 is a small compact open
star cluster with an apparent diameter of only 5 arcminutes. It is classified
as type I 2 p according to Trumpler. NGC 6204
contains about 36 stars and is located about 3500 light-years from the solar
system. The cluster was discovered by James Dunlop on May 13,
1826.
Directly southeast lies the much younger star cluster
Hogg 22. With a distance of about 9000
light-years it is nearly 3 times farther away from the solar system than NGC
6204. 22 stars are assigned to Hogg 22. The age of the stars is estimated to be
only a few million years.
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by Franz Hofmann + Wolfgang Paech |