猎户座流星雨在金牛座
(原标题: Orionids in Taurus)
2023-10-26
浏览次数: 17
历史上第一颗已知的周期彗星，哈雷彗星（1P/哈雷），每76年左右返回太阳系内部。这颗著名的彗星最后一次裸眼出现是在1986年。但是在每年的两次流星雨中，我们可以看到哈雷彗星的尘埃碎片像雨一样划过地球的天空，这两次流星雨分别是5月的埃塔水瓶座流星雨和10月的猎户座流星雨。事实上，在10月23日凌晨，在金牛座分子云的星光背景下，一系列不紧不慢的曝光捕捉到了这两颗明亮的流星，蒸发了哈雷彗星的碎片。以每秒66公里的速度撞击大气层，它们的绿色条纹指向了流星雨的辐射点，就在猎户座明亮的参宿四北边，在画面的左下方。我们熟悉的昴宿星团锚定了右边布满尘埃的天体景象。
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History's first known periodic comet, Comet Halley (1P/Halley), returns to the inner Solar System every 76 years or so. The famous comet made its last appearance to the naked-eye in 1986. But dusty debris from Comet Halley can be seen raining through planet Earth's skies twice a year during two annual meteor showers, the Eta Aquarids in May and the Orionids in October. In fact, an unhurried series of exposures captured these two bright meteors, vaporizing bits of Halley dust, during the early morning hours of October 23 against a starry background along the Taurus molecular cloud. Impacting the atmosphere at about 66 kilometers per second their greenish streaks point back to the shower's radiant just north of Orion's bright star Betelgeuse off the lower left side of the frame. The familiar Pleiades star cluster anchors the dusty celestial scene at the right.
© David Cortner