This year’s night sky has a worthy display in store with three comets are C/2025 K1 (ATLAS), C/2025 R2 (SWAN) and C/2025 A6 (Lemmon). Astronomers will be requiring a good telescope while one of them shall be rare for naked-eye viewings; hence, the title, Halloween comet. The strange comet 3I/Atlas has also stirred interests regarding its origin.
What is C/2025 K1 (ATLAS)?
It was first discovered in May 2025, C/2025 K1 (ATLAS) is now about to get closest to the Sun is called perihelion, which is on October 8. If it survives this extreme solar violence there may be an amazing show depending on how it is placed in the sky. The comet would not rise above the horizon very late in November for most observers.
At about 40 million miles from Earth, it is therefore expected to remain too faintly visible to the naked eye. Only the more sophisticated telescopes will prove to be helpful to the observers as the comet brightens near the Sun.
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What is C/2025 R2 (SWAN)?
C/2025 R2 (SWAN) was discovered on September 11, 2025 by amateur astronomer Vladimir Bezugly at NASA’s Solar and Heliospheric Observatory (SOHO) currently it is about 50 million miles away. This comet has already passed perihelion and climbs higher each day above the western horizon.
On October 19 it will have its closest approach to Earth, at just 24 million miles while the magnitude of this comet will continue to brighten a telescope will be needed for any detailed observations.
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What is C/2025 A6 (Lemmon)?
C/2025 A6 (Lemmon) is boss this year for the casual observers it was discovered on January 3, 2025, at Mount Lemmon telescopes in Arizona and orbits the Sun every 1,396 years. It last passed close to Earth in the year 629 and will not be back until 3421. Continuing to brighten until perihelion on November 8, C/2025 A6 (Lemmon) may be viewable to the naked eye in late October an exceedingly rare treat for skywatchers this year.
Between naked-eye sighting and telescope-required sighting and this year’s comet season is one to not miss out on by astronomers. Track the comet’s tracks and chart your own observations so you will catch a celestial guest in full bloom.
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Disclaimer: This article is for informational purposes. Verify comet sightings and timings using official astronomy sources before planning observations.
