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NGC 6934 (Globular Cluster)


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NGC 6934
Globular Cluster (球状星団)
Gb VIII

別名 (Other names)
GCL 117, Caldwell 47

明るさ (Brightness)
8.9等級

星座 (Constellation)
いるか座 (Del) (Delphinus)

距離 (Distance)
50,000光年 (50,000 light-years)

NGC 6934またはカルドウェル47は、いるか座の方角に約5万光年の位置にある球状星団。
1785年9月24日にウィリアム・ハーシェルが発見した。

NGC 6934 is a globular cluster located 50,000 light years from the Earth in the constellation Delphinus.

NGC 6934 (Globular Cluster) : Picture

Globular Star Cluster NGC 6934
Globular Star Cluster NGC 6934
(C) NASA, ESA, Hubble Space Telescope
Globular star clusters roam the halo of our Milky Way Galaxy. Gravitationally bound, these spherical groupings of typically several hundred thousand stars are ancient, older than the stars of the galactic disk. In fact, measurements of globular cluster ages constrain the age of the Universe and accurate cluster distance determinations provide a rung on the astronomical distance ladder. Globular star cluster NGC 6934 itself lies about 50,000 light-years away in the constellation Delphinus. At that distance, this sharp image from Hubble's Advanced Camera for Surveys spans about 50 light-years. The cluster stars are estimated to be some 10 billion years old.

NGC 6934 from Gemini North
NGC 6934 from Gemini North
(C) Gemini Obs., NSF, & U. Hawaii IfA
What's going on near the center of globular cluster NGC 6934? The blur caused by the Earth's atmosphere has prevented astronomers from discerning individual stars in this unusual environment. Telescopes in space can help, but the new Gemini North telescope took the above picture from the ground. In infrared light, Gemini was able to use its adaptive optic mirrors to resolve stars even near the globular cluster's center. NGC 6934 is a 15 billion-year-old ball of hundreds of thousands of stars. Dating stars in ancient globular clusters like NGC 6934 provide valuable constraints on the minimum age of the universe.

NGC 6934
NGC 6934
(C) NOAO

Globular Star Cluster NGC 6934 NGC 6934
Globular Star Cluster NGC 6934
(C) NASA/ESA
NGC 6934
(C) NOAO
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NGC 6934 (Globular Cluster) : Movie

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「ウィキペディア(wikipedia):フリー百科事典」より文章引用。
NGC 6934. (2013, May 31). In Wikipedia.
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