The "once-in-a-lifetime" green glow—Comet Lemon (C/2025 A6) will make its closest approach to Earth in October. Don't miss its "collaboration" with the meteor shower.

In the fall of 2025, the green-glowing Lemon Comet (C/2025 A6) will be at its best for observation. It will make its closest approach to Earth around October 20-21, at a distance of approximately 0.60 astronomical units (about 89 million km). In dark skies with little light pollution, it has the potential to brighten to a magnitude of 4-5, making it more easily visible with binoculars. Moreover, October 21 coincides with a new moon, ensuring dark skies, and the Orionid meteor shower will also peak around this time, offering a potential "double feature" of the comet and meteor shower. The Lemon Comet is a long-period comet with an estimated orbit of about 1,350 years, having last passed through the inner solar system in the 7th century, with its next visit expected in the 3400s. This makes it a "once-in-a-lifetime" opportunity. In the Northern Hemisphere, it will appear low in the northwest to west-northwest sky in the evenings from mid-October, with better viewing conditions at mid to high latitudes (regions north of 48°N may even experience circumpolar visibility). In the Southern Hemisphere, there will be a brief opportunity to view it low in the northern sky in the evenings of early October. Since comets are unpredictable and can be overestimated, it's advisable to prepare by finding a dark location, a low horizon, and using binoculars. Detailed guidance on observation safety, etiquette, and photography settings will be provided in the main text.