There are currently seven comets or objects of debatable nature in our solar system. They all seem to be heading towards us... around the same time frames:
"The comet named C/2025 A6 (Lemmon) was discovered in January 2025 with the Mt. Lemmon telescope and approaches the Sun every 1396 years. Its closest point to the Sun will be on November 8, 2025, and its closest to Earth will be on October 21, 2025. Its brightness is currently around 8.5, but it could reach between magnitude 3-7 in October-November (a lower number means brighter) – potentially visible to the naked eye in a dark sky, otherwise with a small telescope. In the Northern Hemisphere, it can be looked for near the constellation Gemini on the western horizon in the evening; however, it will fade quickly and may disappear from view in November.
Another one, C/2025 R2 (SWAN), is a new visitor detected by the SWAN satellite. Its approach to the Sun is around the end of September, and its closest approach to Earth is in mid-October (between October 12-19). Its brightness varies between magnitude 6-14; at its best in October, its tail may be prominent. It is more easily observed in the Southern Hemisphere in the evening sky – in the north, it may remain close to the horizon. It's important not to miss it in October as it will fade rapidly.
C/2025 K1 (ATLAS) is a discovery of the ATLAS telescope; perihelion is in mid-November, and its closest approach to Earth is on November 24-25, 2025. Its brightness is around magnitude 8-12, meaning it generally requires a telescope. It will appear low on the horizon in the evening sky in the Northern Hemisphere and could brighten to 7.5 in October but will then fade quickly.
A source of interstellar excitement, 3I/2025 N1 (ATLAS), was discovered in July 2025 and is coming from outside the Solar System – the third such object. Perihelion is at the end of October (around October 30), and its closest approach to Earth is in mid-December (December 18-19). Its brightness is magnitude 11-14, so it is observed with a telescope; it will approach the Sun at a distance of 1.4 AU and may disappear from view around perihelion but will return in November.
C/2024 E1 (Wierzchos) is a longer-period one; perihelion is around September 2025, with its closest approach to Earth in mid-October, but its brightness is magnitude 9-12 – it should be sought with a telescope near Corona Borealis in the north. It could brighten to magnitude 5 by January 2026, so it can be watched as it slowly brightens in late 2025.
240P/NEAT is a short-period comet; perihelion is in September 2025, with a brightness of magnitude 12-13. It will be of low brightness in the north but active and can be tracked with a telescope throughout the autumn and winter.
Finally, 414P/STEREO is a discovery of the STEREO mission; perihelion is in September 2025, with a brightness between magnitude 12-18 – one of the faintest, but scientifically valuable. It requires a large telescope and will fade quickly in its orbit close to the Sun."
