彗星2022 E3 （ZTF）
(原标题: Comet 2022 E3 (ZTF))
2022-12-24
浏览次数: 16
彗星C/2022 E3 （ZTF）是今年3月初由天文学家使用兹威基瞬变设施的宽视场巡天相机发现的。从那时起，这颗新的长周期彗星已经明显变亮，现在正在黎明前的天空中横扫北方的北极光冠星座。不过，如果没有望远镜，它还是太暗了。但这张12月19日的望远镜图像确实显示了彗星明亮的绿色彗发，短而宽的尘埃尾巴和长而暗淡的离子尾巴延伸在2.5度的宽视场上。在穿越内太阳系的旅程中，2022彗星E3将在新年的1月12日到达离太阳最近的近日点，在2月1日到达离我们美丽的星球最近的近地点。众所周知，彗星的亮度是不可预测的，但到那时，C/2022 E3 （ZTF）可能只能在黑暗的夜空中用眼睛看到。
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Comet C/2022 E3 (ZTF) was discovered by astronomers using the wide-field survey camera at the Zwicky Transient Facility this year in early March. Since then the new long-period comet has brightened substantially and is now sweeping across the northern constellation Corona Borealis in predawn skies. It's still too dim to see without a telescope though. But this fine telescopic image from December 19 does show the comet's brighter greenish coma, short broad dust tail, and long faint ion tail stretching across a 2.5 degree wide field-of-view. On a voyage through the inner Solar System comet 2022 E3 will be at perihelion, its closest to the Sun, in the new year on January 12 and at perigee, its closest to our fair planet, on February 1. The brightness of comets is notoriously unpredictable, but by then C/2022 E3 (ZTF) could become only just visible to the eye in dark night skies.
© Dan Bartlett