ZTF彗星的尾部
(原标题: Tails of Comet ZTF)
2023-01-09
浏览次数: 18
ZTF彗星可以用肉眼看到。这个巨大的雪球在去年年初被发现，它在接近太阳和地球时一直在变亮。本周晚些时候，C/2022 E3 （ZTF）将最接近太阳，届时即使没有双筒望远镜，北方的观测者也可以在晴朗而黑暗的天空中看到它。当彗星靠近太阳时，其亮度是出了名的难以预测。在上周拍摄的一幅特色图像中，在一个风景如画的恒星场前，三个蓝色离子尾巴延伸到右上方，可能是由冰冷的彗星核喷射出的离子上的可变太阳风造成的。这颗彗星的白色尘埃尾巴在左上角可见，而且要短得多。绿光是彗星的彗发，是由发光的碳气体引起的。ZTF彗星预计将在2月初经过离地球最近的地方，之后它将急剧变暗。探索+拓展：APOD研究生研究职位开放
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Comet ZTF may become visible to the unaided eye. Discovered early last year, this massive snowball has been brightening as it approaches the Sun and the Earth. C/2022 E3 (ZTF) will be closest to the Sun later this week, at which time it may become visible even without binoculars to northern observers with a clear and dark sky. As they near the Sun, comet brightnesses are notoriously hard to predict, though. In the featured image taken last week in front of a picturesque star field, three blue ion tails extend to the upper right, likely the result of a variable solar wind on ions ejected by the icy comet nucleus. The comet's white dust tail is visible to the upper left and much shorter. The green glow is the comet's coma, caused by glowing carbon gas. Comet ZTF is expected to pass nearest the Earth in early February, after which it should dim dramatically. Discovery + Outreach: Graduate student research position open for APOD
© Jose Francisco Hernández