Double comet alert! Comets Lemmon and SWAN can be at their closest and brightest this week. This is easy methods to spot them.

If you wish to see two comets, your greatest probability can be early this week. After a 12 months with none comets vivid sufficient to be seen with out specialist tools, two — Comet C/2025 A6 (Lemmon) and Comet C/2025 R2 (SWAN) — have come alongside directly.

Comet Lemmon might look extra like a lime than its title suggests, however on Tuesday (Oct. 21), the dusty snowball from the outer photo voltaic system will attain its closest level to Earth and most definitely shine at its brightest. It’s now reached magnitude 4.5, in response to SpaceWeather.com — about the identical brightness as spring’s Beehive Cluster (M44) and solely just a little dimmer than the Andromeda galaxy (M31).

While Comet Lemmon is technically seen to the bare eye in very darkish skies, you will want binoculars to glimpse another, fainter icy visitor, Comet C/2025 R2 (SWAN). Remarkably, Comet SWAN will get closest to Earth Monday (Oct. 20), the day before Comet Lemmon, but it’ll be about three times dimmer, at magnitude 5.9. (In astronomy, the higher the magnitude, the dimmer the object.)

The best time to see both comets any night this week will be about an hour and a half after sunset; you can check local times on Timeanddate.com. On Monday, Comet Lemmon can be seen within the northwest sky, close to the Big Dipper and the intense star Arcturus, and near the horizon.

Follow the form of stars within the Big Dipper’s deal with to “arc to Arcturus”; the comet can be about two-thirds of the way in which there. On Tuesday, it will likely be just a little increased. For Comet SWAN, search for the Summer Triangle of vivid stars — Vega, Deneb and Altair — within the southwest. You’ll discover Comet SWAN about midway between Altair and the horizon.

Helpful finder charts and sky maps for each comets can be found at The Sky Live, In-The-Sky.org and Stellarium, in addition to in night-sky apps corresponding to Sky Guide, Sky Tonight and SkySafari 7 Pro. If you wish to strive photographing the comets, our information has you coated.

The two comets are on vastly totally different journeys. Comet Lemmon will get to inside 56 million miles (89 million kilometers) of Earth Tuesday, in response to The Sky Live, on its method to looping across the solar Nov. 8 throughout its 1,350-year orbit of the solar. (However, Jupiter sapped a few of Comet Lemmon’s orbital vitality, shortening its interval by practically 200 years, in response to Star Walk, so it is not going to return till 3179.)

Comet SWAN is a long-period comet, orbiting the solar each 20,000 years, in response to Universe Today, and on Monday, it will likely be 24 million miles (39 million km) away because it exits the inside photo voltaic system. That’s a couple of quarter the space between Earth and the solar.