171215期:北天的双子座流星雨

北天的双子座流星雨

一年一度的双子座流星雨再次降临,地球仿佛穿梭活跃小行星3200号释放出的尘埃之中。这张照片拍摄于北半球的夜空,展现了流星雨由双子座辐射点向外放射的过程。此次创作利用到了12月12日至13日的夜间8.5小时记录流星轨迹的37组影像。最后成像组合时,特选的照片再与内蒙古明安图天文基地的射电频谱日像仪(MUSER)的一座碟形天线上方的星空对齐。大犬座α星天狼星在碟形天线的正上方闪闪发光,而银河则向天顶延伸。银河北端右侧泛着微黄光亮的参宿四在猎户座中格外醒目。流星辐射点位于图片左上角,邻近双子座双星——北河二和北河三,高悬于地平线之上。原本平行的流星轨迹在透视角度下犹如汇聚于一点。双子座流星在穿越地球大气层时速度约22千米每秒。

:银河说翻译组 1949101

Geminids of the North
Image Credit & Copyright: Yin Hao

Explanation: Earth’s annual Geminid meteor shower did not disappoint as our fair planet plowed through dust from active asteroid 3200 Phaethon. Captured in this northern hemisphere nightscape, the meteors stream away from the shower’s radiant in Gemini. To create the image, 37 individual frames recording meteor streaks were taken over period of 8.5 hours during the night of December 12/13. In the final composite they were selected and registered against the starry sky above a radio telescope dish of MUSER, a solar-dedicated radio telescope array at astronomically-named Mingantu Station in Inner Mongolia, China, about 400 kilometers from Beijing. Sirius, alpha star of Canis Major, shines brightly just above the radio dish and the Milky Way stretches toward the zenith. Yellowish Betelgeuse is a standout in Orion to the right of the northen Milky Way. The shower’s radiant is at top left, high above the horizon near Castor and Pollux the twin stars of Gemini. The radiant effect is due to perspective as the parallel meteor tracks appear to converge in the distance. Gemini’s meteors enter Earth’s atmosphere traveling at about 22 kilometers per second.

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