October 2025 is shaping up to be an unforgettable month for skywatchers. Not one but two comets are expected to brighten the night sky and may become visible to the naked eye if conditions are favorable.
The pair, Comet C/2025 A6 (Lemmon) and Comet C/2025 R2 (SWAN), are set to pass close to Earth this month, offering millions of people around the world a rare cosmic spectacle that can be enjoyed without telescopes, according to science.sbtechem.com, as reported by Zeri.info.
A Rare Double Celestial Show
Comets are icy celestial bodies that travel through the solar system, leaving behind glowing tails of gas and dust as they approach the Sun. Seeing one comet with the naked eye is a special event, but seeing two in the same month is extraordinarily rare.
Comet C/2025 A6 (Lemmon) was first discovered in January 2025 and will make its closest approach to Earth around October 20–21. Astronomers predict it could reach a magnitude of 4, which is near the limit of naked-eye visibility. If the sky is clear and dark, it should be visible without binoculars.
Comet C/2025 R2 (SWAN), discovered later in September, will also pass near Earth at the end of October. Early forecasts suggest it could shine as brightly as Lemmon, potentially reaching magnitude 4 as well. Although comets are notoriously unpredictable, SWAN could provide a stunning visual display.
The best viewing period for both comets will be from October 20 to 23, when they are closest to Earth and the Moon will be near its new phase, reducing its brightness and offering ideal conditions for observation.
