Comet Lemmon to Traverse Serpens Caput on October 26

Comet C/2025 A6 (Lemmon) is set to pass through the constellation Serpens Caput on the night of October 26, 2025. Discovered on January 3, 2025, the comet has been brightening as it approaches the inner solar system. Currently, it has an estimated magnitude of +4.3, making it visible to the naked eye from dark sky locations.

Observers should look to the western horizon at sunset on October 26 to spot Comet Lemmon beneath the triangular formation of stars representing the head of Serpens Caput. By the following night, the comet will have moved through the neck of the constellation, approaching Ophiuchus, the 'snake bearer.'

Serpens is unique as the only constellation divided into two parts: Serpens Caput (the head) to the right of Ophiuchus and Serpens Cauda (the tail) to the left. While Comet Lemmon is bright enough to be seen unaided, using binoculars or a telescope will enhance the viewing experience.