How to See Comet Lemmon This October

This long-duration comet will make its closest approach to Earth this fall, before disappearing into the outer solar system for another 1,000 years. Comet Lemmon (C/2025 A6) photographed in Texas in late September 2025. It was early January 2025 when a faint light spot was observed at the Mt. Follow-up observations revealed that the object was a comet visiting from the outer edge of the solar system, and it was named Comet Lemmon (C/2025 A6). Its "period"--the time it takes to complete its lengthy orbit of the sun--is about 1,350 years.