Key Takeaways
1. Two comets, C/2025 A6 (Lemmon) and C/2025 R2 (SWAN), are expected to be visible in October 2025.
2. C/2025 A6 (Lemmon) is becoming brighter and may reach a magnitude of 3.9, making it potentially visible without aids.
3. The best time to view C/2025 A6 is right after sunset, near the stars Arcturus and Izar, in a dark area away from light pollution.
4. C/2025 R2 (SWAN) has a long orbital period of 22,554 years and will be near the star Spica on October 21, shining at a magnitude of 4.
5. Visibility of C/2025 R2 is uncertain, so using binoculars or a small telescope is recommended for the best chance of seeing it.
In the past few months, sky watchers have been treated to a range of celestial happenings, including meteor showers. However, this autumn promises even more excitement, as two comets may be visible at the same time.
Discovering C/2025 A6 (Lemmon)
One of these comets is C/2025 A6 (Lemmon), which was first spotted on January 3, 2025, by the Mount Lemmon Survey. Initially, its brightness wasn’t sufficient for everyone to see it. But as it moves through our solar system, it’s getting brighter.
Since last August, spotting it has become much easier, with its brightness now at a magnitude of 8.5. If it continues on its current path without any issues, it could reach a magnitude of 3.9 on October 21, 2025.
Viewing Tips for C/2025 A6
This increase in brightness could allow it to be seen without any aids, similar to the Neowise comet. However, be cautious; you’ll want to find a dark area free from light pollution to truly appreciate it. Astronomers suggest that the best time to catch a glimpse is right after sunset, focusing your gaze towards the stars Arcturus and Izar.
The Arrival of C/2025 R2 (SWAN)
The second comet expected to be visible this October is C/2025 R2 (SWAN). Vladimir Bezugly discovered this comet, which takes a staggering 22,554 years to complete its orbit around the Sun.
To spot it near the star Spica, you’ll need to wait until October 21. On this date, it will be approximately 0.27 astronomical units away from Earth, shining at a magnitude of 4. However, take note that predicting whether it will be visible to the naked eye is tricky, as comets can behave in unexpected ways and may even break apart as they travel. For the best chance of seeing it, having binoculars or a small telescope is recommended.
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