Two comets are coming through in October that you may want to keep an eye (telescope) on. Predictions of comet brightness are always hard, and reality may be brighter or less bright than predictions. The limiting magnitude for unaided eye visibility is 6 or brighter, meaning a number of 6 or smaller.

Comet C/2025 K1 (ATLAS)

Peak magnitude of ATLAS is predicted to be 9.8 on October 8, 2025.

Map of Comet C/2025 K1 (ATLAS) position in the morning sky from October 20-30, 2025.
Map of Comet C/2025 K1 (ATLAS) position in the morning sky from October 20-30, 2025.

Comet C/2025 A6 (Lemmon)

Peak magnitude of Lemmon is predicted to be 4.3 on October 21, 2025.

Map of Comet C/2025 A6 (Lemmon) position in the morning sky from October 1-5, 2025.
Map of Comet C/2025 A6 (Lemmon) position in the morning sky from October 1-5, 2025.
Map of Comet C/2025 A6 (Lemmon) position in the evening sky from October 15-30, 2025.
Map of Comet C/2025 A6 (Lemmon) position in the evening sky from October 15-30, 2025.