2019 July 25

Cygnus Skyscape
Image Credit & Copyright:
Alistair Symon

Explanation: In brush strokes of interstellar dust and glowing hydrogen gas, this beautiful skyscape is painted across the plane of our Milky Way Galaxy near the northern end of the Great Rift and the constellation Cygnus the Swan. Composed with three different telescopes and about 90 hours of image data the widefield mosaic spans an impressive 24 degrees across the sky. Alpha star of Cygnus, bright, hot, supergiant Deneb lies near top center. Crowded with stars and luminous gas clouds Cygnus is also home to the dark, obscuring Northern Coal Sack Nebula, extending from Deneb toward the center of the view. The reddish glow of star forming regions NGC 7000, the North America Nebula and IC 5070, the Pelican Nebula, are just left of Deneb. The Veil Nebula is a standout below and left of center. A supernova remnant, the Veil is some 1,400 light years away, but many other nebulae and star clusters are identifiable throughout the cosmic scene. Of course, Deneb itself is also known to northern hemisphere skygazers for its place in two asterisms — marking the top of the Northern Cross and a vertex of the Summer Triangle.

Alistair Symon

说明: 这幅以星际尘埃和氢气辉光为笔触的美丽星空影像,呈现了我们银河系盘面裂缝(大暗隙)北端附近及天鹅座的景观。由三部不同的望远镜、总曝光时间约90小时的影像数据,组合而成的这幅大视野拼接影像,涵盖了天空24度的区域。其中,天鹅座α星–明亮炽热的超巨星天津四,位在影像的顶缘中间附近。而繁星及明亮气体群集的天鹅座,也是从天津四延伸到视野中心,名为北方煤袋星云的黝黑云气之家园。在天津四的左侧,有泛红的恒星形成区北美洲星云(NGC 7000)和鹈鹕星云(IC 5070)。影像中左下方的醒目天体,则为距离约1,400光年远,名为面纱星云超新星遗迹。此外,这片宇宙天区里,还散布着许多可辨识的星云和星团。对北半球的观星者来说,天津四是构成二个著名星群的重要天体,它分别是北十字的顶点和夏三角的顶点。

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志刚 谢