双子座在中国的念湖上空
(原标题: Geminids over China's Nianhu Lake)
2023-12-17
浏览次数: 25
这些流星都是从哪里来的？就天空的方向而言，准确的答案是双子座。这就是为什么12月的主要流星雨被称为双子座——因为流星雨似乎都来自双子座的辐射源。然而，从三维的角度来看，这颗不寻常的小行星3200法厄同喷出的沙粒大小的碎片沿着一条明确的轨道围绕我们的太阳运行，而接近地球的轨道部分重叠在双子座的前面。因此，当地球穿过这个轨道时，碎片的辐射点出现在双子座。这里的特色是几天前在中国年湖黑暗的天空中拍摄的许多图像的合成。从双子座流星雨中可以看到100多条明亮的流星条纹。APOD年度回顾（2023）：RJN的夜空网络讲座
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Where are all of these meteors coming from? In terms of direction on the sky, the pointed answer is the constellation of Gemini. That is why the major meteor shower in December is known as the Geminids -- because shower meteors all appear to come from a radiant toward Gemini. Three dimensionally, however, sand-sized debris expelled from the unusual asteroid 3200 Phaethon follows a well-defined orbit about our Sun, and the part of the orbit that approaches Earth is superposed in front of the constellation of Gemini. Therefore, when Earth crosses this orbit, the radiant point of falling debris appears in Gemini. Featured here is a composite of many images taken a few days ago through dark skies from Nianhu Lake in China. Over 100 bright meteor streaks from the Geminids meteor shower are visible. APOD Year in Review (2023): RJN's Night Sky Network Lecture
© Hongyang Luo