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Comet Lemmon to Light Up Night Sky in 2025

9/27/2025

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Summary

Story summary

It will be closest to Earth on October 20–21, 2025, and may be visible to the naked eye.
Comet C/2025 A6 (Lemmon) was discovered January 3, 2025, and was initially mistaken for an asteroid.
Brightness is rising (mag 4.5–7); the orbit shortens to about 1,150 years due to Jupiter, with perihelion on November 8, 2025, and fading by late November.

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Story summary

It will be closest to Earth on October 20–21, 2025, and may be visible to the naked eye.
Comet C/2025 A6 (Lemmon) was discovered January 3, 2025, and was initially mistaken for an asteroid.
Brightness is rising (mag 4.5–7); the orbit shortens to about 1,150 years due to Jupiter, with perihelion on November 8, 2025, and fading by late November.