瓦尔帕罗拉山口上空的海尔-波普彗星

2021年12月08日

Comet Hale-Bopp Over Val Parola Pass
Image Credit & Copyright: A. Dimai, (Col Druscie Obs.), AAC

Explanation: 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.

Tomorrow’s picture: open space

瓦尔帕罗拉山口上空的海尔-波普彗星
影像提供与版权: A. Dimai, (Col Druscie Obs.), AAC

说明: 名为1997年大彗星的海尔-波普，比它周围任何恒星都来得亮，甚至透过明亮的都市灯光都能看见它。而在远离都市灯光的干扰时，它更是一幅不折不扣的奇景。这张摄于意大利科尔蒂纳丹佩佐镇附近多洛米特山脉的瓦尔帕罗拉山口之海尔-波普彗星影像，即可为证。影像中，海尔-波普彗星从彗核排出的离子所组成之泛蓝离子尾，受到太阳风的吹拂外指。彗核释出的较大颗粒尘埃，则受到太阳光压的推挤，形成散落在彗星后方轨道上的黄白色尘尾。海尔-波普彗星 (C/1995 O1)肉眼可见的期间长达18个月，冠于信史记录中的任何彗星。这颗大彗星预期会在4385年左右再次回归。在目前的夜空中，李奥纳德彗星不断增亮，或许再过不久肉眼即可见。

明日的图片: open space