Comet Lemmon

A Once-in-a-Millennium Visitor Lights Up the Sky If you haven’t been skywatching lately, now is the time – Comet C/2025 A6, nicknamed Lemmon, is putting on its best show in late October 2025. This rare comet was first spotted in January by the Mount Lemmon Survey in Arizona sfgate.com. Since then it has been steadily brightening as it races toward the inner solar system space.com. By this week, Comet Lemmon reached magnitude ~4, making it one of the brightest comets of the year and borderline visible to the unaided eye under ideal conditions skyatnightmagazine.com. For context, that’s about as bright