If you want to see two comets, your best chance will be early this week. After a year without any comets bright enough to be seen without specialist equipment, two — Comet C/2025 A6 (Lemmon) and Comet C/2025 R2 (SWAN) — have come along at once.
Comet Lemmon may look more like a lime than its name suggests, but on Tuesday (Oct. 21), the dusty snowball from the outer solar system will reach its closest point to Earth and most likely shine at its brightest. It's now reached magnitude 4.5, according to SpaceWeather.com — about the same brightness as spring's Beehive Cluster (M44) and only a little dimmer than the Andromeda galaxy (M31).
