神秘流星疑案

探索宇宙（universe）！每天都会展示一张我们迷人宇宙的不同图像或照片，并附上一段由专业天文学家（astronomer）撰写的简短说明。

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2026年8月19日

2026 August 19

说明：是谁干的？什么东西在横穿日偏食（eclipse）的太阳时消失了？让我们展示一下证据。这段每秒24帧的视频拍摄于2026年8月12日20:28的地方时（local time），地点位于西班牙（40°34'30.3"N 1°12'28.8"W）。当时正值英仙流星群（Perseids）流星雨（meteor shower）的极大期。这是一颗流星（meteor）吗？流星雨的轨迹可以追溯到天空中被称为辐射点（radiant point）的区域，该区域对应于地球（Earth）穿过彗星（comet）轨道的路径。该物体的路径或许可以追溯到位于英仙座（Perseus）星座（constellation）内的英仙流星群辐射点。该物体在天空中的轨迹角度比0.5度的太阳和月球（Moon）要小，这比预期的流星轨迹更小。它的亮度并没有延伸出太阳太多，但一颗在天空中燃烧的流星并不需要阳光才能被看见。也许是阳光反射在物体上？在将位置、时间和天空中的点与飞行数据库进行交叉比对后，发现罪魁祸首是一条飞机尾迹！

Explanation: Whatdunit? What disappeared while crossing a partially eclipsed Sun? Let’s present the evidence. The 24 frames-per-second video was taken in Spain (40°34'30.3"N 1°12'28.8"W) at 20:28 local time on August 12, 2026. The Perseids meteor shower was at its peak during this time. Is this a meteor? Meteor showers trace back to a region of the sky called a radiant point that corresponds to where the Earth is crossing a comet’s path. The object’s path might trace back to the Perseids’ radiant point in the Perseus constellation. The object trails a smaller angle on the sky than the 0.5 degree Sun and Moon, which is smaller than expected for a meteor. Its brightness does not extend much past the Sun, but a meteor burning up in the sky would not need sunlight to be seen. Perhaps the sunlight is reflecting off of the object? After cross-referencing the location, time, and point in the sky with a flight database, the culprit is found to be an airplane contrail!