彗星12P/Pons-Brooks尾部的结构
(原标题: Structure in the Tail of Comet 12P/Pons-Brooks)
2024-02-16
浏览次数: 15
彗星12P/Pons-Brooks将于4月21日再次经过近日点，它的亮度越来越大。这颗周期哈雷彗星的绿色彗发已经变得相对容易用小型望远镜观察到。但现在从活跃彗星的彗发中流出的蓝色离子尾受到太阳风的冲击，很微弱，很难追踪。尽管如此，在这张2月11日晚上拍摄的照片中，叠加曝光的图像显示了暗淡的彗尾的详细结构。这幅画面跨越了暗淡的恒星和背景星系的背景，跨度超过2度，朝向北方的蕾丝座。当然，12P彗星在4月21日的近日点经过将在4月8日的日全食之后仅两周，这颗彗星将与完全日食的太阳一起出现在地球的天空中。
查看原文解释
Heading for its next perihelion passage on April 21, Comet 12P/Pons-Brooks is growing brighter. The greenish coma of this periodic Halley-type comet has become relatively easy to observe in small telescopes. But the bluish ion tail now streaming from the active comet's coma and buffeted by the solar wind, is faint and difficult to follow. Still, in this image stacked exposures made on the night of February 11 reveal the fainter tail's detailed structures. The frame spans over two degrees across a background of faint stars and background galaxies toward the northern constellation Lacerta. Of course Comet 12P's April 21 perihelion passage will be only two weeks after the April 8 total solar eclipse, putting the comet in planet Earth's sky along with a totally eclipsed Sun.
© Dan Bartlett