2025年11月4日
洛姆尼茨基峰上空的莱蒙彗星
影像提供与版权: Robert Barsa
说明: 近期，莱蒙彗星在全球各地的天文摄影镜头前上演了一场壮观的表演。这颗深受摄影师喜爱的彗星，全名为C/2025 A6 (Lemmon)，在十月底通过距离地球最近的位置时，展现出两条又长又壮丽的尾巴，一条是蓝色的离子尾（Ion Tail），另一条则是白色的尘尾（Dust Tail）。离子尾受到太阳风的推动而被吹离彗发，方向会随太阳风变化而摆动。在这张长时间曝光的影像中，离子尾的长度甚至超过满月直径的二十倍。相较之下，较短且宽的尘尾则反射太阳光而发亮，同样由彗发向外延伸。这张照片拍摄于两周前，画面中彗星位于斯洛伐克的塔特拉山脉的洛姆尼茨基峰（Lomnický Peak）上方，而该山峰正是著名的岩湖天文台所在地。如今，随着莱蒙彗星远离地球，它的亮度正逐渐减弱。这颗巨大的”太空 雪球“预计将在本周稍晚时分绕过太阳，完成它壮丽的太阳系巡游。
明日的图片: spiraling stars
Due to the lapse in federal government funding, NASA is not updating APOD website. We sincerely regret this inconvenience.
由于美国联邦政府资金中断，NASA目前暂停更新APOD网站。对此带来的不便，我们深感抱歉。
英文原文:
Explanation: Comet Lemmon has been putting on a show for cameras around the globe. Passing nearest to Earth in late October, the photogenic comet C/2025 A6 (Lemmon) sprouted two long and picturesque tails: a blue ion tail and a white dust tail. The ion tail is pushed away from the coma by the ever-present but ever-changing solar wind , at one point extending over 20 times the diameter of the full Moon — as captured in this long-duration exposure. The shorter and wider dust tail is pushed away from the coma and shines by reflecting sunlight. The featured picture , captured two weeks ago, framed the comet behind Lomnický Peak of the High Tatra Mountains , home to the Slovakia n Lomnický Stit Observatory . Comet Lemmon is now fading as it heads away from planet Earth. The huge shedding snow ball will round the Sun later this week.
