今日天文图片
莱蒙彗星变亮
(原标题: Comet Lemmon Brightens)
2025-09-30
浏览次数: 1223
莱蒙彗星正在变亮，并进入北方的早晨天空。除了天鹅25b彗星和阿特拉斯彗星之外，C/2025 A6彗星（莱蒙彗星）是目前用双望远镜和长时间相机曝光可以看到的第三颗彗星。莱蒙彗星是今年早些时候发现的，目前仍在向内太阳系前进。这颗彗星将在11月8日绕太阳运行，但首先它将在10月21日经过离地球最近的地方——大约是地日距离的一半。虽然彗星的亮度是出了名的难以预测，但乐观的估计莱蒙彗星将在那时肉眼可见。这颗彗星最好在黎明前的天空中观测到，直到10月中旬，它也可以在傍晚的天空中看到。上周晚些时候在美国德克萨斯州拍摄的这张特写照片显示了彗星分裂和快速变化的离子尾巴。成长画廊：2025年的莱蒙彗星
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Comet Lemmon is brightening and moving into morning northern skies. Besides Comet SWAN25B and Comet ATLAS, Comet C/2025 A6 (Lemmon) is now the third comet currently visible with binoculars and on long camera exposures. Comet Lemmon was discovered early this year and is still headed into the inner Solar System. The comet will round the Sun on November 8, but first it will pass its nearest to the Earth -- at about half the Earth-Sun distance -- on October 21. Although the brightnesses of comets are notoriously hard to predict, optimistic estimates have Comet Lemmon then becoming visible to the unaided eye. The comet should be best seen in predawn skies until mid-October, when it also becomes visible in evening skies. The featured image showing the comet's split and rapidly changing ion tail was taken in Texas, USA late last week. Growing Gallery: Comet Lemmon in 2025
© Victor Sabet & Julien De Winter