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). According to NASA, Comet Lemmon will be closest to Earth around October 21, 2025, passing at a distance of about 0.60 astronomical units, or au (1 au is the distance between Earth and the sun). Comet Lemmon is notable for its greenish tint. Comet Lemmon (C/2025 A6) photographed in Slovenia in early October. Photograph: Uroš FinkHow to View the CometAs of early October, Comet Lemmon can be found slightly below the handle in the Big Dipper (or the Plough, as it's known in the UK), which forms part of the Ursa Major constellation.