180112期:蓝色的泛星彗星

蓝色的泛星彗星

在2016年9月7日由泛星望远镜发现的泛星彗星C/2016 R2,目前距离地球24光分(3AU),它掠过行星地球的天空,穿过了金牛座的背景恒星。来自距离我们太阳系很遥远的奥尔特云的入境访客,它美丽而又复杂的踪迹是一道引人注目的蓝色阴影。尽管这颗彗星离太阳还相当遥远,但其发育完整的离子尾却令人们印象深刻。而彗星内部含量异常丰富的电离化一氧化碳(CO+),在受到越来越强烈的阳光激发后发出了荧光,这为彗星穿上了美丽的蓝色外衣。上面这幅泛星彗星的色彩影像,整合了1月7日晚由两架不同望远镜所拍摄到的数据。当时,这颗彗星在金牛座V形毕宿星团的顶点,影像左下角的晕光则是来自亮星毕宿四。

译:银河说翻译组  潘Hellen

Blue Comet PanSTARRS

Image Credit &Copyright: Damian Peach,Jose J. Chambo

Explanation: Discovered with the PanSTARRS telescope on September 7, 2016, this Comet PanSTARRS,C/2016 R2, is presently about 24 light minutes (3 AU) from the Sun,sweeping through planet Earth’s skies across the background of stars in the constellation Taurus. An inbound visitor from our Solar System’s distant Oort Cloud, its beautiful and complexion tail is a remarkable shade of blue. Still relatively far from the Sun, the comet’s already well-developed ion tail is very impressive. Emission from unusually abundant ionized carbon monoxide (CO+) atoms fluorescing in the increasing sunlight is largely responsible for the pretty blue tint. This color image of the blue comet is a combination of data taken from two different telescopes during the night of January 7. Located at the apex of the V-shaped Hyades star cluster in Taurus, bright star Gamma Tauri is responsible for the glow at the bottom left corner of the frame.

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