Comet Lemmon (C/2025 A6) is quickly brightening as it draws closer to both the sun and Earth, evolving into a striking object already visible through small telescopes and binoculars and soon, quite possibly, to the naked eye.

The icy visitor, discovered on Jan. 3 by the Mount Lemmon Survey in Arizona, is the brightest comet to appear in our sky since Comet C/2024 G3 (ATLAS) last January. It will swing close to the sun, a point called perihelion, on Nov. 8, passing about 49.25 million miles (79.25 million kilometers) from our star.

Now, as it brightens rapidly in the predawn sky, skywatchers around the world are preparing for its best and possibly brightest display in late October.

What to expect

Typically, during a given year, several comets will appear that come within range of good b

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