伦纳德彗星摇尾
(原标题: Comet Leonard's Tail Wag)
2022-01-10
浏览次数: 17
伦纳德彗星为什么摇尾巴？这段特色的延时视频显示了上个月初彗星C/2021 A1 （Leonard）在10天内的变化。这段视频是由美国宇航局的日地关系天文台-前方（STEREO-A）航天器拍摄的，该航天器以与地球大致相同的距离绕太阳运行。这个29度视场中的每张图像都从下面的图像中减去，以创建突出差异的帧。这段视频清楚地显示了伦纳德彗星长长的离子尾巴在太阳风的吹拂下伸展、摇摆，或者被吹来吹去。太阳风是一种从太阳流出的快速移动的离子流。自从拍摄了这段视频后，伦纳德彗星继续向太阳俯冲，在水星和金星的轨道之间达到了离太阳最近的距离，在这次最接近的距离中幸存下来，没有分裂，现在正逐渐淡出我们的太阳系。周二在Zoom上：APOD编辑将呈现2021年最佳APOD空间图像
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Why does Comet Leonard's tail wag? The featured time-lapse video shows the ion tail of Comet C/2021 A1 (Leonard) as it changed over ten days early last month. The video was taken by NASA's Solar Terrestrial Relations Observatory-Ahead (STEREO-A) spacecraft that co-orbits the Sun at roughly the same distance as the Earth. Each image in this 29-degree field was subtracted from following image to create frames that highlight differences. The video clearly shows Comet Leonard's long ion tail extending, wagging, and otherwise being blown around by the solar wind -- a stream of fast-moving ions that stream out from the Sun. Since the video was taken, Comet Leonard continued plunging toward the Sun, reached its closest approach to the Sun between the orbits of Mercury and Venus, survived this closest approach without breaking apart, and is now fading as heads out of our Solar System. Tuesday over Zoom: APOD editor to present the Best APOD Space Images of 2021