今年以来最亮彗星现身天际，它的名字叫“莱蒙”

Core Viewpoint - The C/2025 A6 (Lemmon) comet, with a 1300-year orbital period, has gained public attention as it approaches its perihelion, providing a rare opportunity for observation in various regions of China during dawn and dusk [1][4]. Group 1 - The Lemmon comet is expected to pass its perihelion on November 8, 2025, and will be visible in the early morning and evening skies in most parts of China [1][4]. - The comet is likely a long-period comet originating from the Oort Cloud, which contains billions of primitive small celestial bodies [2][3]. - Initial brightness expectations for the comet were low, but it has exceeded these expectations since early July, leading to increased global interest and successful observations by astronomy enthusiasts [4]. Group 2 - The comet's nucleus appears green with a long, pale blue tail, making it visually distinctive [4]. - Observers in the northern hemisphere can see the comet in the eastern sky before sunrise until October 20, after which it will be visible in the western sky after sunset [4]. - Visibility of the comet will vary slightly by region, and it will become increasingly difficult to observe after its perihelion [4].