2025年9月30日
Comet Lemmon Brightens
Image Credit & Copyright: Victor Sabet & Julien De Winter
Explanation: 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
Tomorrow’s picture: mopping up
彗星莱蒙增亮
影像提供与版权: Victor Sabet & Julien De Winter
说明: 彗星莱蒙正在变亮并进入清晨的北方天空。除了彗星SWAN25B和彗星ATLAS之外，彗星C/2025 A6（莱蒙, Lemmon）是目前可以用双筒望远镜和长时间曝光相机观测到的第三颗彗星。彗星莱蒙今年初被发现，目前仍然朝向内太阳系运行。这颗彗星将于11月8日绕过太阳，但首先会在10月21日通过距离地球最近的点，距离约为地日距离的一半。虽然彗星的亮度出了名的难以预测，但乐观的估计认为彗星莱蒙届时将肉眼可见。这颗彗星应该在十月中旬之前，最好在黎明前的天空中观测，之后在傍晚的夜空中也能看到它。主题影像展示了彗星分裂且迅速变化的离子尾，这张照片于上周晚些时候在美国 德克萨斯州所拍摄。
不断增长的画廊: 2025年的彗星莱蒙
明日的图片: mopping up
