海尔-波普彗星在帕罗拉山口的上空
(原标题: Comet Hale-Bopp Over Val Parola Pass)
2021-12-08
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海尔-波普彗星，1997年的大彗星，变得比周围的任何恒星都要亮得多。即使在明亮的城市灯光下也能看到。然而，在远离城市灯光的地方，它上演了一场相当壮观的表演。这是海尔-波普彗星在意大利科尔蒂纳丹佩佐周围白云石山脉的帕罗拉峡谷山口拍摄的照片。海尔-波普彗星的蓝色离子尾巴，由彗核的离子组成，被太阳风推出。白色的尘埃尾巴是由彗核中较大的尘埃颗粒组成的，这些尘埃颗粒是由彗星后面轨道上的阳光压力所驱动的。海尔-波普彗星（C/1995 O1）在18个月的时间里保持肉眼可见，比历史上有记录的任何彗星都要长。这颗大彗星下一次预计将在4385年左右返回。这个月，伦纳德彗星正在变亮，可能很快就可以用肉眼看到了。
查看原文解释
Comet Hale-Bopp, the Great Comet of 1997, became much brighter than any surrounding stars. It was seen even over bright city lights. Away from city lights, however, it put on quite a spectacular show. Here Comet Hale-Bopp was photographed above Val Parola Pass in the Dolomite mountains surrounding Cortina d'Ampezzo, Italy. Comet Hale-Bopp's blue ion tail, consisting of ions from the comet's nucleus, is pushed out by the solar wind. The white dust tail is composed of larger particles of dust from the nucleus driven by the pressure of sunlight, that orbit behind the comet. Comet Hale-Bopp (C/1995 O1) remained visible to the unaided eye for 18 months -- longer than any other comet in recorded history. The large comet is next expected to return around the year 4385. This month, Comet Leonard is brightening and may soon become visible to the unaided eye.
© A. Dimai, (Col Druscie Obs.), AAC