海格力斯大球狀星團
The Great Globular Cluster in Hercules
來源:Jan Beckmann, Julian Zoller, Lukas Eisert, Wolfgang Hummel|發表日期:2024-09-26
1716 年,英國天文學家埃德蒙-哈雷(Edmond Halley)指出:"這只是一個小補丁,但當天空寧靜、月亮缺席時,它就會顯現在肉眼下。當然,M 13 現在已不再被認為是海格力斯的大球狀星團,它是北天最亮的球狀星團之一。從望遠鏡的銳利視角可以看到這個壯觀的星團,其中有數十萬顆恆星。在 25000 光年的距離上,星團中的恆星擠在一個直徑為 150 光年的區域內。接近星團核心時,一個邊長僅為 3 光年的立方體中可以容納 100 多顆恆星。相比之下,距離太陽最近的恆星也在 4 光年以上。這幅深寬視場影像還顯示了遙遠的背景星系,包括左上方的 NGC 6207 ,以及被一些人稱為綜合通量星雲的微弱的前景銀河塵埃雲。
原文:In 1716, English astronomer Edmond Halley noted, "This is but a little Patch, but it shows itself to the naked Eye, when the Sky is serene and the Moon absent." Of course, M13 is now less modestly recognized as the Great Globular Cluster in Hercules, one of the brightest globular star clusters in the northern sky. Sharp telescopic views like this one reveal the spectacular cluster's hundreds of thousands of stars. At a distance of 25,000 light-years, the cluster stars crowd into a region 150 light-years in diameter. Approaching the cluster core, upwards of 100 stars could be contained in a cube just 3 light-years on a side. For comparison, the closest star to the Sun is over 4 light-years away. The deep, wide-field image also reveals distant background galaxies including NGC 6207 at the upper left, and faint, foreground Milky Way dust clouds known to some as integrated flux nebulae.
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