Don’t miss the two newly discovered comets visible this month!
Learn how to view these exciting new comets and how they were discovered.
October 2025 will be a memorable month of celestial viewing. Stargazers can spot two comets, C/2025 R2 (SWAN) and C/2025 A6 (Lemmon), as they make their closest approach to Earth. While binoculars are recommended for the best view, there is a chance the comets may brighten enough to be seen with the naked eye.
Comet C/2025 R2 (SWAN)
Named for the Solar Wind Anisotropies (SWAN) instrument that detected it, this comet is brightening for Northern Hemisphere viewers throughout the month.
- When to watch: This long-period comet will make its closest approach to Earth on October 19.
- Where to look: In mid-October, find a dark location an hour after sunset and look to the southwest.
- How to view: Binoculars or a small telescope are your best bet. While its magnitude makes it just shy of naked-eye visibility under dark skies, it is notoriously unpredictable and could brighten unexpectedly.
Comet C/2025 A6 (Lemmon)
Comet Lemon might be the best comet of 2025. Discovered in January 2025 by astronomers at the Mt. Lemmon SkyCenter in Arizona. This comet could be one of the brightest of the year.
- When to watch: It will be closest to Earth on October 21.
- Where to look: For Northern Hemisphere observers, look toward the Big Dipper in the northwestern evening sky during the second half of October.
- How to view: Around its peak visibility in late October and early November, it could brighten enough for naked-eye viewing in very dark conditions.
Viewing tips
For the best experience, find a dark location away from city lights and other light pollution. Allow your eyes to adjust to the darkness for at least 20 minutes. Star-charting apps can help you pinpoint the comets’ exact locations in real time.
October is also when the annual Orionid meteor shower is active, peaking around October 20–21, so keep an eye out for meteors streaking across the sky while you’re comet-hunting.
New comets are numbered and named. Stars receive only a number, which means that you can name a star.










