October 2025 is shaping up to be one of the most exciting months of the year for skywatchers. From two dazzling comets streaking across the night sky to the return of the Orionid meteor shower and a special appearance by Mercury, the month is packed with must-see celestial events. Whether you’re a seasoned stargazer or a casual skywatcher, this guide will help you mark your calendar and prepare for an unforgettable month under the stars.

 

1. Double Comets: SWAN and Lemmon Brighten October Skies

One of the biggest highlights of October 2025 is the rare sight of two bright comets visible just days apart a spectacle not seen in years.

Comet C/2025 R2 (SWAN): Expected to glow with a greenish hue due to gases in its coma, Comet SWAN will become visible in mid-October and reach peak brightness around October 18–20.

Comet C/2025 A6 (Lemmon): Appearing shortly after, Comet Lemmon will have a bluish-white glow and could brighten enough to be visible even without a telescope near October 20–22.

These two cosmic visitors will light up the pre-dawn and evening skies, depending on your location. For the best chance to see them, head to a dark location away from city lights and allow your eyes time to adjust. Binoculars or a small telescope will enhance the view, but both comets may be visible to the naked eye if they brighten as predicted.

 

2. Orionid Meteor Shower – October 21–22

Right after the comets’ appearance, the sky will deliver another treat: the Orionid meteor shower. Peaking overnight from October 21 to 22, the Orionids are one of the most reliable meteor showers of the year, producing around 20 meteors per hour under ideal conditions.

The Orionids are remnants of Halley’s Comet, and they streak across the sky from the direction of the constellation Orion. The meteors are fast, bright, and often leave glowing trails. This year, the moon will be in a favorable phase, making viewing conditions excellent.

Best time to watch: After midnight until dawn, away from artificial lights.

 

3. Mercury at Greatest Elongation – October 23

On October 23, Mercury will reach its greatest western elongation, appearing farthest from the Sun in the morning sky. This is the best time of the year to catch a glimpse of the elusive inner planet just before sunrise.

Look low on the eastern horizon about 30–45 minutes before sunrise. Mercury will appear as a bright star-like object, and while the Moon won’t be close to it this time, the crisp morning sky will make spotting it easier with the naked eye or binoculars.

 

4. Full Hunter’s Moon – October 6

October’s Full Hunter’s Moon will rise on the night of October 6, glowing brightly as it lights up autumn skies. Traditionally named by early peoples for the hunting season, this full moon is perfect for night photography and moon-gazing. It will appear large and luminous shortly after sunset.

 

Tips for Watching October’s Events

Find dark skies: Go somewhere away from city lights to reduce light pollution.

Check the weather: Clear skies are essential for viewing comets and meteors.

Use simple gear: A pair of binoculars or a small telescope can greatly enhance your view of comets and Mercury.

Be patient: Give your eyes 20–30 minutes to adjust to the dark for the best night-sky experience.

 

A Month You Don’t Want to Miss

October 2025 is truly a skywatcher’s dream. With two rare comets lighting up the heavens, the Orionids painting streaks across the sky, and Mercury shining at its best, this month offers a spectacular lineup of cosmic events. Mark your calendars, grab your binoculars, and prepare for an unforgettable journey through the wonders of our universe