一英里射电望远镜上的星迹
(原标题: Star Trails over One-Mile Radio Telescope)
2025-09-13
浏览次数: 1523
英国剑桥Mullard射电天文台的一英里望远镜的60英尺直径的可操纵碟形天线，在这令人回味的夜空中指向天空。为了捕捉这一戏剧性的场景，在90分钟的时间里，连续30秒的曝光被记录下来。结合起来，这些曝光揭示了优雅的弧形星迹的背景，反映了行星地球在其轴上的每日旋转。北天极是地球自转轴向太空的延伸，点在北极星附近。这是一颗明亮的恒星，它在同心圆的中心附近创造了短迹。但具有历史意义的一英里望远镜阵列也依赖于地球的自转来运行。在无线电波长上探索宇宙，它是第一个使用地球自转孔径合成的射电望远镜。这种技术利用地球的自转来改变望远镜阵列和天体射电源的相对方向，以比人眼更好的分辨率创建天空的射电图。
查看原文解释
The steerable 60 foot diameter dish antenna of the One-Mile Telescope at Mullard Radio Astronomy Observatory, Cambridge, UK, is pointing skyward in this evocative night-skyscape. To capture the dramatic scene, consecutive 30 second exposures were recorded over a period of 90 minutes. Combined, the exposures reveal a background of gracefully arcing star trails that reflect planet Earth's daily rotation on its axis. The North Celestial Pole, the extension of Earth's axis of rotation into space, points near Polaris, the North Star. That's the bright star that creates the short trail near the center of the concentric arcs. But the historic One-Mile Telescope array also relied on planet Earth's rotation to operate. Exploring the universe at radio wavelengths, it was the first radio telescope to use Earth-rotation aperture synthesis. That technique uses the rotation of the Earth to change the relative orientation of the telescope array and celestial radio sources to create radio maps of the sky at a resolution better than that of the human eye.
© Joao Yordanov Serralheiro