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2023年9月1日 The Great Globular Cluster in Hercules Image Credit & Copyright: Serge Brunier, Jean-François Bax, David Vernet OCA/C2PU Explanation: 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 th
2022年8月4日 M13: The Great Globular Cluster in Hercules Image Credit & Copyright: Joan Josep Isach Cogollos Explanation: 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
2021年05月20日 M13: The Great Globular Cluster in Hercules Image Credit & Copyright: Martin Dufour Explanation: In 1716, English astronomer Edmond Halley noted, “This is but a little Patch, but it shews itself to the naked Eye, when the Sky is serene and the Moon absent.” Of course, M1
2020 March 19 M13: The Great Globular Cluster in Hercules Image Credit & Copyright: Eric Coles and Mel Helm Explanation: In 1716, English astronomer Edmond Halley noted, “This is but a little Patch, but it shews itself to the naked Eye, when the Sky is serene and the Moon absent.” O
2019 June 13 M13的颜色和星等 影像提供与版权: Tolga Gumusayak, Robert Vanderbei 说明: M13又称为武仙座大球状星团。在这个距离我们约25,000光年远的球形天体里，数十万颗成员星挤在宽约150光年的空间之内。这张图片左上角的M13之清晰彩色身影，是许多用望远镜巡天者很熟悉的景观。较特殊的，或许是右下使用同一组数据制作，带有更多资讯的M13之颜色-星等图。这种又称为赫罗（HR）图的图表，是以每颗成员星的视亮度相对于它的色指数作图。每颗星的色指数，定义为它透蓝光滤镜量测、以星等为单位的视亮度，减法红光滤镜的星等视亮度（B-R）。因为星色泛蓝的恒
