ファイル:Caldwell 47.jpg
元のファイル (4,001 × 4,002 ピクセル、ファイルサイズ: 14.22メガバイト、MIME タイプ: image/jpeg)
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概要
解説Caldwell 47.jpg |
English: This Hubble image of Caldwell 47 shows a gleaming globular cluster in all of its glory. Star clusters like this one encircle our galaxy like bees buzzing around a hive. Sparsely packed open clusters are often strewn throughout the disk of the galaxy — a relatively flat area that includes most of the galaxy’s contents, including the spiral arms. Globular clusters, however, are typically found in the galaxy’s halo — a diffuse, spherical area that surrounds the heart of the galaxy.
Caldwell 47 is about 50,000 light-years away from Earth, but the combined light of its many thousands of stars calls our attention from halfway across the galaxy. Hubble imaged the cluster here in visible and infrared light, which combines the type of light that we can see (visible) with a kind that can peer through clouds of dust (infrared). Hubble’s observations presented astronomers the opportunity to study some of Caldwell 47’s strangest stellar members — blue stragglers. Blue straggler stars are so named because they seem to lag behind in the aging process, appearing younger than the rest of the stars they formed with. Astronomers think that blue stragglers might emerge from binary systems — pairs of stars that orbit each other. One possible scenario is when the more massive star of the pair evolves and expands, the smaller star steals material away from its companion. This stirs up hydrogen fuel and causes the growing star to undergo nuclear fusion at a faster rate. It burns hotter and bluer, like a massive young star. Caldwell 47 was first spied by British astronomer William Herschel in 1785, though he originally thought it was a nebula. Also cataloged as NGC 6934, it is found in the Delphinus constellation and is best viewed in summer night skies in the Northern Hemisphere, or winter skies in the Southern Hemisphere. With a magnitude of 8.8, the cluster can be seen in binoculars, but it will likely appear to be a single star. Through a moderate or large telescope, individual stars can be picked out at the edges of the cluster, with the central region remaining an unresolved haze of stars. For more information about Hubble’s observations of Caldwell 47, see: www.spacetelescope.org/images/potw1023a/ Credit: ESA/Hubble & NASA For Hubble's Caldwell catalog site and information on how to find these objects in the night sky, visit: www.nasa.gov/content/goddard/hubble-s-caldwell-catalog |
日付 | |
原典 | https://www.flickr.com/photos/144614754@N02/49201277627/ |
作者 | NASA Hubble |
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この画像は当初、NASA Hubble によって Flickr の https://flickr.com/photos/144614754@N02/49201277627 に投稿されたものです。2020-02-23、FlickreviewR 2 ボットによってレビューされ、cc-by-2.0 のライセンスで提供されていることが確認されました。 |
2020年2月23日
27 9 2010
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14,910,696 バイト
4,002 ピクセル
4,001 ピクセル
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日付と時刻 | サムネイル | 寸法 | 利用者 | コメント | |
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現在の版 | 2020年2月23日 (日) 20:03 | 4,001 × 4,002 (14.22メガバイト) | Killarnee | User created page with UploadWizard |
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原画像データの生成日時 | 2010年9月27日 (月) 10:00 |
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短いタイトル | A Distant backwater of the Milky Way |
帰属/提供者 | ESA/Hubble & NASA |
ソース | ESA/Hubble |
画像の説明 | This bright spray of stars in the small but evocative constellation of Delphinus (the Dolphin) is the globular cluster NGC 6934. Globular clusters are large balls of (typically) a few hundred thousand ancient stars that exist on the edges of galaxies. Lying 50 000 light-years from Earth, in the outer reaches of our Milky Way galaxy, NGC 6934 is home to some of the most distant stars still to be part of our galactic system — in a sense, it is a far-flung suburb to the Milky Way’s city centre. NGC 6934 was first seen by William Herschel in the late eighteenth century. He classified it as a “bright nebula” and was not able to resolve it into stars. The cluster is not bright enough to see with the naked eye, and even in ideal conditions it is very difficult to view with binoculars. However, it is a popular target for amateur astronomers as it can easily be observed using relatively inexpensive telescopes. Broadcaster Patrick Moore, presenter of BBC TV’s The Sky at Night for more than 50 years, included this cluster in his “Caldwell catalogue” of celestial objects that amateur astronomers should look out for.NGC 6934’s faintness is down to its distance — not how bright it really is. With its many thousands of stars, the cluster is no minnow. The fact that the huge core of our galaxy dwarfs it, along with the other 150 or so globular clusters that orbit the Milky Way’s galactic centre, is a reminder of the breathtaking scale of the cosmos.This picture was taken with the Wide Field Channel of the NASA/ESA Hubble Space Telescope’s Advanced Camera for Surveys. It was created from images taken through filters F814W (near infrared) and F606W (orange), coloured red and blue respectively. The exposure times were 29 minutes per filter, and the field of view is 3.3 arcminutes across. |
公開者 | ESA/Hubble |
使用条件 |
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JPEGファイルのコメント | This bright spray of stars in the small but evocative constellation of Delphinus (the Dolphin) is the globular cluster NGC 6934. Globular clusters are large balls of (typically) a few hundred thousand ancient stars that exist on the edges of galaxies. Lying 50 000 light-years from Earth, in the outer reaches of our Milky Way galaxy, NGC 6934 is home to some of the most distant stars still to be part of our galactic system — in a sense, it is a far-flung suburb to the Milky Way’s city centre. NGC 6934 was first seen by William Herschel in the late eighteenth century. He classified it as a “bright nebula” and was not able to resolve it into stars. The cluster is not bright enough to see with the naked eye, and even in ideal conditions it is very difficult to view with binoculars. However, it is a popular target for amateur astronomers as it can easily be observed using relatively inexpensive telescopes. Broadcaster Patrick Moore, presenter of BBC TV’s The Sky at Night for more than 50 years, included this cluster in his “Caldwell catalogue” of celestial objects that amateur astronomers should look out for.NGC 6934’s faintness is down to its distance — not how bright it really is. With its many thousands of stars, the cluster is no minnow. The fact that the huge core of our galaxy dwarfs it, along with the other 150 or so globular clusters that orbit the Milky Way’s galactic centre, is a reminder of the breathtaking scale of the cosmos.This picture was taken with the Wide Field Channel of the NASA/ESA Hubble Space Telescope’s Advanced Camera for Surveys. It was created from images taken through filters F814W (near infrared) and F606W (orange), coloured red and blue respectively. The exposure times were 29 minutes per filter, and the field of view is 3.3 arcminutes across. |
画像方向 | 通常 |
水平方向の解像度 | 72dpi |
垂直方向の解像度 | 72dpi |
使用ソフトウェア名 | Adobe Photoshop CS3 Windows |
ファイル変更日時 | 2010年8月16日 (月) 18:26 |
YCCの画素構成 (YとCの位置) | 中心 |
Exifバージョン | 2.31 |
デジタルデータの作成日時 | 2010年8月16日 (月) 18:26 |
各コンポーネントの意味 |
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対応フラッシュピックスバージョン | 1 |
色空間情報 | その他 |
IIMバージョン | 4 |
キーワード | NGC 6934 |
画像のビットの深さ |
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画像の高さ | 4,002 ピクセル |
画像の幅 | 4,001 ピクセル |
画素構成 | RGB |
コンポーネント数 | 3 |
連絡先情報 |
http://www.spacetelescope.org/ Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany |
メディアの種類 | Observation |
メタデータの最終更新日 | 2010年8月16日 (月) 20:26 |